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Um sono reparador é fundamental para a pessoa realizar suas atividades diárias com excelência. O ronco primário e a Síndrome Obstrutiva do Sono (SAHOS) são considerados grandes inimigos de um sono com eficiência devido a fragmentação que ele causa em um sono normal. Cada mini despertar causa um recomeço do sono e no final de uma noite de sono não traz devidos benefícios. Várias modalidades de tratamento são testadas para cada caso indo desde aparelhos intraorais até Cirurgias Ortognáticas para protrusão dos maxilares e facilitando a saída e entrada do ar, claro que traz prejuízo estético ao paciente além de serem muito invasivas. O padrão ouro para o diagnóstico é a polissonografia (Polissonografia Basal, Polissonografia com CPAP (Titulação), Polissonografia Noite Dividida (Split Night), realizadas em institutos do sono e aparelhos mais modernos sendo feito a nível domiciliar. A mais aceita dos tratamentos é com o CPAP (Pressão Positiva Constante) que possui além de um compressor que produz corrente de ar, possui um dispositivo que pode ser nasal ou buco nasal ou facial que faz com que a orofaringe superior fique aberta durante a entrada e saída do ar. Vários modelos estão disponíveis e desse modo a escolha do modelo correto é essencial e ainda possui um alto custo. A tecnologia atual tenta desenvolver mini e microcpaps que faram menos barulho e ocuparão menos espaços, com a mesma eficiência nas polissonografias.

The aim of this study was to compare PETG/TPU (polyethylene terephthalate glycol/thermoplastic polyurethane) with PETG (polyethylene terephthalate glycol), based on color stability and microhardness. Sixty circular specimens (10 mm in diameter × 3 mm thick) were fabricated (30 PETG/TPU and 30 PETG). The specimens in both groups were submitted to 2000 thermal cycles in alternating baths of 60 seconds at 5°C ± 1°C and 55°C ± 1°C. The specimens were then divided into subgroups (n = 10) that were disinfected 15 minutes per day for 60 days in 1 of 3 solutions: liquid soap, 2% chlorhexidine, or Listerine. Color change (∆E*) and Knoop microhardness tests were performed at baseline (T0), after thermocycling (T1), and after disinfection (T2). Analysis of variance (ANOVA) and Tukey test were used (P0.05). ANOVA showed that there was no statistically significant difference in color change between the 2 materials after thermocycling (∆E*1) or after disinfection (∆E*2), regardless of the disinfectant. Intragroup comparisons (Listerine, liquid soap, and 2% chlorhexidine) of the 3 PETG/TPU groups or 3 PETG groups after disinfection revealed no statistically significant difference for microhardness. Comparison of PETG/TPU with PETG based on the overall mean microhardness showed that the PETG/TPU had a significantly greater mean surface hardness value (P0.05). The Tukey test revealed statistically significant increases in microhardness at T1 and T2 for PETG/TPU and PETG so that T0T1T2 (P0.05). Both thermoplastic materials demonstrated an increase in hardness after thermocycling and after disinfection, and both showed similar color changes regardless of the disinfection method. Based on the color evaluation, the liquid soap proved to be the best option for disinfection of PETG/TPU and PETG, because the color change (∆E* value) was clinically acceptable for both materials.

Made available in DSpace on 2018-12-11T16:41:48Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-03-01. Added 1 bitstream(s) on 2019-10-09T18:28:35Z : No. of bitstreams: 1 S1807-59322016000300156.pdf: 786719 bytes, checksum: 50096c581bd12397c174be8494c376dc (MD5) OBJECTIVE: The aims of this study were to examine the trans- and postoperative systemic characteristics of patients undergoing dental implant surgery and to investigate the relationship between pre- and post- surgery anxiety levels. MATERIAL AND METHODS: Thirty-nine patients were analyzed in 3 call centers to determine anxiety levels, pain levels, and preoperative and postoperative histories using the State–Trait (STAI) questionnaire. RESULTS: A total of 93 dental implants were installed, with a success rate of 100%. The most frequently reported systemic disease was hypertension. There was a significantly higher rate of effective clamping (torque) to the mandibular bone than to the maxillary bone. The association between postoperative surgical complications and longer operative time was not significant, but there was a significant correlation between the alteration of mouth opening and daily routine activities and a significant decrease in anxiety levels between the day of surgery and the postoperative time point (p=0.006). CONCLUSION: A longer surgical time was associated with surgery-related complications and with a higher anxiety index on the preoperative evaluation. Departamento de Odontologia Material e Prótese Dentária Departamento de Cirurgia e Clínica Integrada Universidade Estadual Paulista (UNESP), Faculdade de Odontologia Pública

This study investigated the effects of the ocular prosthesis fabrication technique and the paint on the color stability of the artificial iris button before and after polymerization of the colorless resin. Sixty samples simulating artificial eyes were made, including 30 samples with blue- and 30 samples with sepia-colored artificial irises. Ten samples were made by each of three techniques (i.e., conventional, prefabricated cap, and inverted painting) for each color. The color of the artificial iris button was measured through reflection spectrophotometry by the CIE L*a* b* system before and after polymerization of the prosthesis (colorless resin). Data were evaluated by analysis of variance (ANOVA) and the Tukey honestly significant different (HSD) tests (α=0.05). All of the samples exhibited color changes. Samples made by the prefabricated cap technique exhibited the highest color change values for both colors (P

Introduction The treatment of orofacial tumors may cause facial deformities by losses of structures that affect basic functions, i.e. feeding, speech, and the reduction of patient self-steam. Presentation of case A white male patient was diagnosed with epidermoid cancer on the mandibular alveolar ridge with infiltration staging IV A. The patient was submitted to a mandibulectomy associated with a complete extraction of mandibular teeth. For rehabilitation, a conventional denture for the mandibular arch and a removable partial denture for the maxillary arch were fabricated. A correct occlusal adjustment and a satisfactory amount of alveolar bone was favorable for conventional dentures of the prostheses bases improve their retention and stability. After one year of follow-up, the patient was adapted to the prostheses, satisfied with their retention, and reported an improvement on his feeding. Discussion The prosthetic rehabilitation of patients after a partial mandibulectomy is essential for their self-steam. Conventional dentures may have their retention and stability improved if they are well fabricated, recorded and have a balanced occlusion. Conclusion A correct occlusal adjustment and an adequate retention of the prostheses bases may improve their retention and stability. Patients without xerostomy and with a satisfactory amount of alveolar bone may have a favorable prognosis for conventional dentures., Highlights • Oral Surgery oncology. • This study investigated the esthetic of the prosthesis rehabilitation. • Patient satisfaction after rehabilitation.

Highlights • This study investigated the aesthetic of the prosthesis rehabilitation. • Patient satisfaction after rehabilitation. • Importance of radiographic control case report., Introduction The aim of this paper was to present a rehabilitation of a patient with a dynamic universal castable long abutment (UCLA) for a single tilted implant in the anterior maxillary area. Presentation of case A 57-year-old male patient attended the dentistry college clinic complaining of a vertical fracture of a residual root of the dental element 22. The tooth extraction was indicated for the implant installation. Due to the socket buccal wall thickness, the implant was installed with an inclination to the palate. It was done in a two-stage surgical protocol, and an external hexagon implant (3.75 × 11.5 mm) was placed. After a six-month healing period to correct the implant position, a dynamic UCLA was set in place, rectifying the implant emergence profile at 20°. The ceramic structure fitting was performed and, after the patient’s consent, the prosthesis was finalized and installed. Discussion After a follow-up period of twenty months, no complications were observed. Conclusion The installation of tilted implants with a dynamic UCLA may be a viable option, faster and less invasive than bone grafts.

This clinical report describes the ocular rehabilitation of a child, initially using an acrylic expander and subsequently the conventional prosthesis. A two-month-old anophthalmic female patient was referred to Araçatuba Dental School, for rehabilitation with ocular prosthesis. The treatment chosen was the manufacturing of expander prostheses changed periodically until the socket reached an adequate size, so that a definitive ocular prosthesis could be installed. The acrylic expander remained in patient’s anophthalmic socket for 60 days in order to restore its volume. After this period, ocular prosthesis was installed and replaced according to facial growth. It can be observed that the expander prostheses increased the anophthalmic cavity and provided patient’s adaptation for using an ocular prosthesis. The ocular prosthesis set the face aesthetic balance which eventually reflects positively on psychological and social development of the child.

This study presented an epidemiological data of 177 medical records of patients affected by oral and pharyngeal cancers with prosthesis indication. The gender, age, sun exposure, disease diagnosis, cancer anatomic site, radiation treatment and type of prosthesis, death from oral and pharyngeal cancers were collected. Data were analyzed by summary measures and logistic regression analysis. The mean age of the patients was 62.7 years, and 46.8% died between 52 and 62 years old. Most of the patients were male (74%), and 42% died among them. Squamous cell carcinoma was the most prevalent cancer (75.1%) and 42.1% of these patients died. The age, gender, diagnosis and the interaction of these factors exhibited strong association with the patients' death (P

The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and opacifier: colourless (I), colourless with opacifier (IO), ceramic (C), opacifier with ceramic (OC), oil (O), and oil with opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps

doi: 10.1111/j.1741-2358.2012.00676.x Effect of thermal cycling and disinfection on colour stability of denture base acrylic resin Objectives: The purpose of this study was to investigate the effect of thermal cycling and disinfection on the colour change of denture base acrylic resin. Materials and Methods: Four different brands of acrylic resins were evaluated (Onda Cryl, QC 20, Classico and Lucitone). All brands were divided into four groups (n = 7) determined according to the disinfection procedure (microwave, Efferdent, 4% chlorhexidine or 1% hypochlorite). The treatments were conducted three times a week for 60 days. All specimens were thermal cycled between 5 and 55°C with 30-s dwell times for 1000 cycles before and after disinfection. The specimens’ colour was measured with a spectrophotometer using the CIE L*a*b* system. The evaluations were conducted at baseline (B), after first thermal cycling (T1), after disinfection (D) and after second thermal cycling (T2). Colour differences (ΔE) were calculated between T1 and B (T1B), D and B (DB), and T2 and B (T2B) time-points. Results: The samples submitted to disinfection by microwave and Efferdent exhibited the highest values of colour change. There were significant differences on colour change between the time-points, except for the Lucitone acrylic resin. Conclusions: The thermal cycling and disinfection procedures significantly affected the colour stability of the samples. However, all values obtained for the acrylic resins are within acceptable clinical parameters.

The matching of the aesthetic, functional, and psychosocial results of a facial deformity may produce devastating effects in its carriers, especially if the lesion is extensive or the treatment is aggressive. Because of this, the objective of the present article was to evaluate patient's satisfaction rating after surgical facial reconstruction or rehabilitation with oral and maxillofacial prosthesis, by means of reviewing the literature.

Aim The aim of this study is to present a clinical case in which an occlusal matrix device was used in a patient who needed to restore a posterior tooth. Material and methods A direct duplicate occlusal appliance was used (biteperf) in a patient who needed an occlusal restoration in two posterior teeth. Results Using the matrix helps having fast and accurate reproduction of the original anatomical details of the occlusal surface. The final result surprised with the presented restoration in terms of esthetic quality, despite the simplicity of the technique. Conclusion Posterior teeth with initial lesions were confined to the occlusal surface of anatomically complex or fissured anatomy with or without signs of proximal caries wich are ideal candidates for this technique. The overlying enamel surface must be relatively intact; lesions of hidden or occult caries. Clinical significance The aesthetic and time-saving benefits of the occlusal device (biteperf) are immediately clear. The matrix allows the fast and accurate reproduction of the anatomic details of the original occlusal surface of the tooth. The professionals who lack an artistic penchant and marked manual ability will be able to carry out excellent posterior resin composite restorations. How to cite this article de Carvalho Dekon SF, Pereira LV, Zavanelli AC, Goiato MC, do Amparo Resende C, dos Santos DM. An Effective Technique to Posterior Resin Composite Restorations. J Contemp Dent Pract 2011;12(6):506-510.

Purpose The purpose of this study was to investigate color change of irises obtained by both printed digital image and painted with gouache, acrylic and oil paints, after polymerization and accelerated aging. Materials and methods Eight samples simulating ocular prostheses were fabricated. Each sample was constituted by one disc of N1 colored acrylic resin and one disc of colorless acrylic resin with the iris interposed between the discs. The irises in brown and blue color were obtained by painting or by digital image. The specimens’ colors were measured with a spectrophotometer using the CIE L*a*b* system, at baseline (B), after polymerization (P), and after 504 h (A1) and 1008 h (A2) of accelerated aging. The data were evaluated by 2-way repeated-measures ANOVA and the Tukey's HSD test (α = .05). Results Color change was observed in all samples both after polymerization and after accelerated aging. The different periods of accelerated aging did not influence on color change for the irises painted with blue oil paint. The polymerization promoted a statistical significant effect on the iris color stability for all painting techniques in comparison to all accelerated aging periods. Conclusion After accelerated aging the oil painting technique showed the greatest color stability while the printed digital images technique the worst.

doi:10.1111/j.1741-2358.2009.00356.x Colour change of soft denture liners after storage in coffee and coke This study was to evaluate the colour change of soft denture liners after thermocycling and storage in coffee and coke. Four liners, two silicone-based (Sofreliner S and Reline GS) and two acrylic resin-based (Soft Confort and Dentuflex), were evaluated in this study. Ten samples were obtained for each group. After 2000 cycles of thermocycling with baths of 5°C and 55°C, five samples were stored in coffee and the remaining samples in coke. The colour alteration was evaluated in a reflection spectrophotometer before and after thermocycling, and after 1, 3, 24, 48 and 96 h of storage in coffee and coke. Data were submitted to anova and Tukey’s HSD test (α = 0.05). Thermocycling and storage period represented a higher statistically significant influence for the resin liners than for the silicone materials. Coke did not influence the colour stability of the materials during storage. However, the coffee solution generated statistically significant colour alteration in the material Soft Confort. In the comparison between the coffee and coke solutions, there was no statistically significant difference for colour alteration only for the material Dentuflex. The silicone liners presented better colour stability following thermocycling and storage independent of the solution. The coffee solution was a statistically significant factor for colour alteration of the material Soft Confort.

Color stability of resin and silicone is an important factor for longevity of facial prostheses. The aim of this study was to evaluate the color stability of resins and silicone for facial prostheses. Three brands of acrylic resin and 1 of facial silicone were evaluated considering pigment incorporation for the colorless materials. Ten samples of each material were fabricated and submitted to measurements of chromatic alteration initially and after 252, 504, and 1008 hours of weathering through visual analysis and spectrophotometry. Data were evaluated by analysis of variance and Tukey test (P < 0.05). Results showed a statistically significant difference in color alteration among materials independent of aging. According to visual analysis, the color difference between pigmented and colorless Silastic MDX4-4210 and between pigmented and colorless Classico acrylic resin was statistically significant for the 3 weathering periods. Aging for 1008 hours represented a significant influence on color alteration of all resins. All materials presented chromatic alteration after accelerated artificial aging.

Osseointegration was an innovative treatment in dentistry during the last 3 decades. The success of osseointegration is related to factors such as material biocompatibility, adequate quality of bone tissue that allows implantation, surgical technique, and macrostructure and microstructure of implant. The osseointegrated implants are successfully applied in dental clinic including oral and facial rehabilitations mainly for patients submitted to mutilating surgeries. However, patients submitted to radiation therapy present risks to treatment with implants owing to adverse effects on bone tissue. Nowadays, the literature suggests different therapies to improve the success of osseointegration such as hyperbaric oxygen therapy that aims to prepare bone and adjacent tissues to receive the implant. Therefore, the purpose of this study was to present a literature review concerning indications, contraindications, successes, and difficulties with hyperbaric oxygen therapy associated to maxillofacial implants.

Purpose: The longevity of an ocular prosthesis is directly related to the resistance to erosion of its material. The purpose of this study was to evaluate the effects of chemical disinfection and the method of investment on the microhardness of ocular prosthesis acrylic resin. Materials and Methods: Thirty-two test specimen investments were obtained in two silicones. A segment was cut in each test specimen, and each specimen was fixed in an acrylic disk. The specimens were then polished and submitted to the first microhardness test before immersion in distilled water and incubation for 2 months. During this 2-month period, the specimens were immersed in a water bath at 37°C and were disinfected daily; half were disinfected with neutral soap and the other half were disinfected with 4% chlorhexidine gluconate. After the storage phase and disinfection, a second microhardness test was performed. The surface microhardness values for the acrylic resins were submitted to ANOVA, followed by the Tukey test. Results: The disinfection and the period of storage did not statistically influence the surface microhardness of the acrylic resin, independent of the method of investment of the specimens (Zetalabor or Vipi Sil). The investment of specimens with Zetalabor silicone presented a greater surface hardness, independent of the type of disinfection and the period of storage. Conclusions: Based on these results, we suggest that the microhardness of the resin evaluated was not influenced by the method of disinfection or the time of storage used and was affected only by the investment material.

The consequences as well the criteria for the prosthetic oral rehabilitations with tooth/implant connection come in the literature, in most of the cases, with controversial results. On one side, many studies consider the connection viable, while the others studies consider impracticable because of the difference biomechanics and physiologic of the two systems. The purpose of this study was to organize, to synthesize and to select literary studies that can standardize solutions when this rehabilitation type is necessary. The study showed that the clinical follow-up result in a high survival rate in a short period and the bioengineering studies did not accept the tooth/implant connection.

Made available in DSpace on 2016-01-28T16:54:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2014. Added 1 bitstream(s) on 2016-01-28T17:01:30Z : No. of bitstreams: 1 ISSN1518-7003-2014-21-42-65.pdf: 259311 bytes, checksum: 21af18b44976960638f00054dce4c39f (MD5) A prótese bucomaxilofacial tem como objetivo a reabilitação de indivíduos com deformidades craniofaciais, decorrentes de traumatismos, más formações congênitas ou tumores. Muitas pesquisas foram realizadas para melhorar a estabilidade e retenção das próteses em pacientes mutilados. Com o advento da osseointegração, a prótese bucomaxilofacial sofreu um grande avanço tornando possível a realização de trabalhos protéticos com estabilidade, qualidade estética e resultados previsíveis. Esse trabalho faz uma revisão de literatura a respeito do uso de implantes zigomáticos na fixação de próteses bucomaxilofaciais. The maxillofacial prosthetic rehabilitation aims of individuals with craniofacial deformities resulting from trauma, congenital malformations or tumors. Many researches have been done to improve the stability and retention of dentures in patients. With the advent of osseointegration, the maxillofacial prosthesis suffered a major advance making possible the realization of prosthetic works with stability, aesthetic quality and predictable results. This paper reviews the literature regarding the use of zygomatic implants in the fixation of maxillofacial prostheses. Universidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araçatuba, Aracatuba, Rua José Bonifácio, 1193, Vila Mendonça, CEP 16015-050, SP, Brasil Universidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araçatuba, Aracatuba, Rua José Bonifácio, 1193, Vila Mendonça, CEP 16015-050, SP, Brasil

One of the concerns after a major trauma to the orbit is to be rebuilt. This can be achieved with care in management of orbital reconstruction, techniques, types of materials, and osseointegrated implants; it allows satisfactory aesthetic recuperation and well-being, whereas psychological therapy allows for patients' reinsertion in social and family environment to make them feel happier and safer.

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:58:27Z No. of bitstreams: 0 Made available in DSpace on 2013-08-22T18:58:27Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-01-01 Made available in DSpace on 2013-09-30T19:54:12Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:14:06Z No. of bitstreams: 0 Made available in DSpace on 2014-05-20T15:14:06Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-01-01 Avaliou-se a resistência de união metal/porcelana utilizando-se uma liga de Ni-Cr, submetida a diferentes tempos de oxidação prévia com o sistema cerâmico Vita-VMK, através do teste preconizado por CHIODI NETTO3. A análise dos resultados permitiu as seguintes conclusões: a ausência da oxidação prévia possibilitou os melhores resultados, sendo que a diferença foi estatisticamente significante; diferentes tempos de oxidação prévia provocaram redução acentuada nos valores obtidos e foram semelhantes entre si; o grupo submetido ao processo de jateamento após a oxidação prévia por cinco minutos mostrou resultados similares aos grupos que também passaram pelo processo de oxidação e não sofreram jateamento posterior. The objective of this research was to evaluate the porcelain-alloy bonding strength using a local-made alloy under different times of pre-oxidation with a ceramic system. The test used was preconized by CHIODI NETTO. The results lead to the following conclusions: the control group (no pre-oxidation) showed the best values, statistically significant, when compared with others groups. The different times of pre-oxidation procedures reduced the values significantly, and the groups were similar to each other. The group submitted to the sandblasting process after a pre-oxidation of 5 minutes, showed similar values when compared with the other groups treated with pre-oxidation without sandblasting. UNESP Universidade de São Paulo UNESP

Avaliou-se a resistência de união metal/porcelana utilizando-se uma liga de Ni-Cr, submetida a diferentes tempos de oxidação prévia com o sistema cerâmico Vita-VMK, através do teste preconizado por CHIODI NETTO3. A análise dos resultados permitiu as seguintes conclusões: a ausência da oxidação prévia possibilitou os melhores resultados, sendo que a diferença foi estatisticamente significante; diferentes tempos de oxidação prévia provocaram redução acentuada nos valores obtidos e foram semelhantes entre si; o grupo submetido ao processo de jateamento após a oxidação prévia por cinco minutos mostrou resultados similares aos grupos que também passaram pelo processo de oxidação e não sofreram jateamento posterior.The objective of this research was to evaluate the porcelain-alloy bonding strength using a local-made alloy under different times of pre-oxidation with a ceramic system. The test used was preconized by CHIODI NETTO. The results lead to the following conclusions: the control group (no pre-oxidation) showed the best values, statistically significant, when compared with others groups. The different times of pre-oxidation procedures reduced the values significantly, and the groups were similar to each other. The group submitted to the sandblasting process after a pre-oxidation of 5 minutes, showed similar values when compared with the other groups treated with pre-oxidation without sandblasting.

The purpose of this study was to investigate the effect of thermal cycling and disinfection on the microhardness of acrylic resins denture base. Four different brands of acrylic resins were evaluated: Onda Cryl, QC 20, Classico and Lucitone. Each brand of acrylic resin was divided into four groups (n = 7) according to the disinfection method (microwave, Efferdent, 4% chlorhexidine and 1% hypochlorite). Samples were disinfected during 60 days. Before and after disinfection, samples were thermal cycled between 5-55 °C with 30-s dwell times for 1000 cycles. The microhardness was measured using a microhardener, at baseline (B), after first thermal cycling (T1), after disinfection (D) and after second thermal cycling (T2). The microhardness values of all groups reduced over time. QC-20 acrylic resin exhibited the lowest microhardness values. At B and T1 periods, the acrylic resins exhibited statistically greater microhardness values when compared to D and T2 periods. It can be concluded that the microhardness values of the acrylic resins denture base were affected by the thermal cycling and disinfection procedures. However, all microhardness values obtained herein are within acceptable clinical limits for the acrylic resins.

Amputations affect both the physical and the psychological aspects of an individual, causing significant impact on self-esteem. The main causes of finger amputations are work-related accidents with dangerous machinery, road traffic accidents, and animal bites, as well as systemic diseases such as diabetes. This report aims to describe a simple technique for fabrication of implant-retained finger prosthesis with a modified base of the retention system.The O-Ring retention system was used with a modified hexagon-shaped base and a metallic capsule adapted to the acrylic resin to attach the prosthesis to the implant.The prosthesis was made with silicone, and after osseointegration, it was installed without complications, leading to a patient satisfied with the end result and encouraged to return to social life.Restoring self-esteem in the patient and static and functional rehabilitation.

The objective of the study was to report the prevention of facial reinjury of a volleyball player using a custom-made protective facial shield. A custom-made protective partial facial shield was fabricated using polymethylmethacrylate and was fitted with a soft lining material to provide additional comfort and protection to the injured area. Facial protection provides greater security against possible facial injuries and allows injured areas to recover during sports practice.

Colour stability of resin and silicone is an important factor for longevity of facial prostheses. The aim of this study was to evaluate the colour stability of resins and silicone for facial prostheses. Three brands of acrylic resin and one of facial silicone were evaluated considering pigment incorporation for the colourless materials. Ten samples of each material were fabricated and submitted to measurements of chromatic alteration initially and after 90 and 180 days of weathering natural through visual analysis and spectrophotometry. Data were evaluated by ANOVA and Tukey test (p0.05). Statistically significant colour alteration was observed among some materials regardless of the period. The materials did not present a statistical difference between 90 and 180 days except for the pigmented heat-polymerized resin. The colour difference between pigmented Silastic MDX4-4210 and colourless Silastic was statistically significant (p0.01) in both periods as well as between pigmented and colourless heat-polymerized resin, and between the resins Rapidaflex and Lentaflex. The visual method demonstrated colour alteration in all materials evaluated during the first 90 days of ageing. All materials exhibited colour alteration due to exposure to environment.

Complete and partial loss of maxillary bone may jeopardize oral physiology and generate complications as oral-sinus-nasal communication. Palatal obturator prostheses are a treatment alternative for rehabilitation of these patients. The aim of this study was to assess stress distribution, through photoelasticity, on palatal obturator prostheses associated with different attachment systems (o'ring, bar clip, and o'ring/bar clip) of implants and submitted to relining. Two photoelastic models were fabricated according to an experimental maxillary model with oral-sinus-nasal communication. One model did not present implants, whereas the other included 2 implants with 13.0 mm in length in the left ridge. Four colorless maxillary obturator prostheses were fabricated and relined with soft silicone. One of these prostheses presented no attachment system, whereas the remaining prostheses included attachment systems adapted to the implants. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope during loading with 100 N at 10 mm/s. The results were based on observation during the experiment and photographic records of stress on the photoelastic model. The bar clip system exhibited the highest stress concentration followed by o'ring/bar clip and o'ring systems. The attachment systems presented different stress distribution with greater concentration surrounding the implants and homogenous stress distribution on the photoelastic model without implants. The highest concentration of fringes occurred, in ascending order, with o'ring, o'ring/bar clip, and bar clip systems.

Bisphosphonates are pharmacologic compounds characterized by high tropism to bone tissue. They affect bone metabolism by inhibition of osteoclast recruitment, proliferation, differentiation, and function. Because they can reduce bone resorption, bisphosphonates are used mainly for the treatment of osteometabolic conditions. However, the use of bisphosphonates has been associated with the onset of osteonecrosis of the jaws and indication of dental implants. As a result of this, the aim of this study was to present the risks and the care that health professionals should take in cases of surgical procedures such as placement of dental implants in patients who make use of bisphosphonates.

As falhas em Prótese Parcial Fixa podem ocorrer de muitas maneiras, sendo a fratura da porcelana associada ao grupo de problemas mecânicos. Esta ocorrência pode ser reparada sem a necessidade de remoção da peça protética, embora a substituição da restauração seja considerada a solução ideal. Assim, diferentes tratamentos superficiais são utilizados para melhorar a força de união entre cerâmica – resina e viabilizar o reparo. Este estudo analisou a superfície cerâmica tratada com ácido fosfórico à 37% e ácido fluorídrico à 9,5% por meio da microscopia eletrônica de varredura. Quarenta amostras cerâmicas (VITA Zahnfabrik, Alemanha), foram confeccionadas a partir de uma matriz metálica circular, com dimensões de 10mmx3mm. As amostras foram divididas nos seguintes grupos, I) controle – sem tratamento; II) tratamento com ácido fluorídrico à 9,5% por 1 minuto; III) tratamento com ácido fluorídrico à 9,5% por 2 minutos; IV) tratamento com ácido fosfórico à 37% por 1 minuto; V) tratamento com ácido fosfórico à 37% por 2 minutos. Após os respectivos tratamentos, as amostras foram metalizadas (20Kv, 15mA, 2 minutos), no aparelho Denton Vaccum Desk II, sendo em seguida, analisadas no MEV (JEOL – JSM 5410). As superfícies tratadas com ácido fosfórico à 37% por 1 ou 2 minutos não apresentaram alterações morfológicas significativa, enquanto a superfície cerâmica tratada com ácido fluorídrico à 9,5% por 1 minuto já apresentou alteração morfológica significativa, sendo este achado mais evidente após 2 minutos de aplicação. Clinicamente este trabalho sugere um reparo mais eficiente quando a superfície cerâmica é tratada com ácido fluorídrico.

This study was to evaluate the colour change of soft denture liners after thermocycling and storage in coffee and coke. Four liners, two silicone-based (Sofreliner S and Reline GS) and two acrylic resin-based (Soft Confort and Dentuflex), were evaluated in this study. Ten samples were obtained for each group. After 2000 cycles of thermocycling with baths of 5°C and 55°C, five samples were stored in coffee and the remaining samples in coke. The colour alteration was evaluated in a reflection spectrophotometer before and after thermocycling, and after 1, 3, 24, 48 and 96h of storage in coffee and coke. Data were submitted to anova and Tukey's HSD test (α=0.05). Thermocycling and storage period represented a higher statistically significant influence for the resin liners than for the silicone materials. Coke did not influence the colour stability of the materials during storage. However, the coffee solution generated statistically significant colour alteration in the material Soft Confort. In the comparison between the coffee and coke solutions, there was no statistically significant difference for colour alteration only for the material Dentuflex. The silicone liners presented better colour stability following thermocycling and storage independent of the solution. The coffee solution was a statistically significant factor for colour alteration of the material Soft Confort.

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:24:34Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:30:37Z : No. of bitstreams: 1 2-s2.0-71149104090.pdf: 104162 bytes, checksum: 6c0ed626f291cec6c1a10d84909c13a7 (MD5) Made available in DSpace on 2014-05-27T11:24:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-12-09 The purpose of this study was to evaluate the Shore A hardness and surface roughness of two silicones for maxillofacial prosthetic treatment, under the influence of chemical disinfection and storage. Twenty-eight specimens were obtained, half of which were made of Silastic MDX 4-4210 silicone and, the other half were made of Silastic 732 RTV silicone. The specimens were divided into four groups: Silastic 732 RTV and MDX 4-4210 with disinfection 3 times a week with Efferdent tablets and the same materials without disinfection. The hardness of the materials was analyzed with a Shore A Durometer. The surface roughness was established by a digital portable roughness tester, initially and 2 months after the confection of the specimens. A variance test was applied (2-way ANOVA), followed by Tukey test (the level of significance was set at 1%). The storage time factor statistically influenced (p < 0.01) the materials' properties of hardness and roughness. MDX 4-4210 (28.59 Shore A, 0.789 Ra) presented higher values than Silastic 732 RTV (18.08 Shore A, 0.656 Ra) for both properties. Regarding the disinfection period, there was no significant difference in any of the materials tested. © 2009 Sociedade Brasileira de Pesquisa Odontológica. Department of Dental Materials and Prosthesis School of Dentistry of Araçatuba São Paulo State University, Araçatuba, SP Department of Dental Materials and Prosthesis School of Dentistry of Araçatuba São Paulo State University, Araçatuba, SP

Many studies on defects caused by trauma, infection, cancer, or congenital are reported in the literature; in nasal reconstructions, contradictions and distinct techniques exist that can be argued. Using the literature, we observe these distinct techniques that can be surgery or in surgery to reestablish and to integrate the patient with satisfaction in the society.

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:23:51Z No. of bitstreams: 0 Made available in DSpace on 2014-05-27T11:23:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-01-01 Objectives: The objective of this study was to evaluate by a visual method of comparison the color stability of nonpigmented and pigmented facial silicones after accelerated aging. Materials and Methods: Two kinds of silicones were used in this study; one specifically formulated for facial prostheses and the other an acetic silicone for industrial use. Twenty-four trial bodies were made for each silicone. These were divided into colorless and intrinsically pigmented groups: ceramic, make-up, and iron oxide. The groups were submitted to accelerated aging for nonmetallic materials. An initial reading and subsequent readings were made at 163, 351, 692, and 1000 hours using a visual method of comparison. The values were annotated in a spreadsheet by two observers, according to scores elaborated for this study. Results: All groups presented color stability in the visual method. According to the results obtained and analyzed in this study, we can conclude that both silicones, Silastic 732 RTV and Silastic MDX 4-4210, behaved similarly, they can therefore be indicated for use in maxillofacial prosthesis. The time factor of aging influenced negatively, independently of the pigmentation, or lack of it, and of silicones and no group had visually noticeable alterations in any of the accelerated aging time, independently of the addition or not of pigments. Department of Dental Materials and Prosthodontics Araçatuba Dental School UNESP - Sao Paulo State University, Araçatuba, Sao Paulo Department of Dental Materials and Prosthodontics Araçatuba Dental School UNESP - Sao Paulo State University, Araçatuba, Sao Paulo

The aim of this study was to evaluate the dimensional changes of denture bases made from different resins after different storage periods. For this purpose, 25 sets of plaster models/resin bases were prepared using 4 acrylic resins submitted to two types of polymerization: 1- QC-20 submitted to polymerization by microwave energy; 2- QC-20 submitted to polymerization by water hot bath; 3- Vipi Cril submitted to polymerization by water hot bath; 4- Vipi Wave submitted to polymerization by microwave energy; and 5- Onda Cryl submitted to polymerization by microwave energy. After polymerization, the specimens were sectioned for accuracy readings using a comparison microscope. Readings were taken at 3 points: the crests of the right (A) and left (B) ridges, and the median region of the palate, in 4 different periods. The data obtained were submitted to two-way ANOVA and Tukey's test at 5% significance level. The greatest distortions were found in the posterior palatal region of the base (M), with statistically significant difference (p

The use of craniofacial implants is an effective treatment for patients with deformities, burns, and cancer sequelae. The sites with the most successful implants are the auricular, nasal, and orbital regions. Furthermore, other factors can affect the implant longevity such as irradiated area, surgical technique, bone quality and quantity, macrostructure and microstructure of the implant, maintenance, and systemic factors.

A adaptação marginal e a rugosidade de superfície são parâmetros fundamentais para o sucesso clinico e longevidade das coroas metalocerâmicas. O primeiro permite o selamento das bordas do preparo, prevenindo contra problemas relacionados a exposição do preparo aos fluidos orais e a placa bacteriana e o segundo, remete ao auxilio de uma boa adaptação a fatores mecânicos e biológicos importantes a qualidade da restauração final. Visto que ambos os aspectos são diretamente relacionados a temperatura em que as ligas são submetidas, o objetivo deste trabalho foi avaliar o desajuste marginal, por meio de microscopia óptica, e rugosidade de superfície, por meio de microscopia confocal, de copings metálicos obtidos com as ligas metalicas de Ni-Cr [Verabond II e experimental (SR)] e Co-Cr (Keragen) injetadas no molde de revestimento a duas diferentes temperaturas de estufagem (900°C e 700°C), de forma a avaliar se a redução da temperatura de estufagem possa causar o melhoramento do resultado das fundições, minimizando os efeitos das altas temperaturas. As leituras foram realizadas em copings confeccionados a partir da fundição de casquetes de munhão calcináveis. Cada coping foi cimentado a uma matriz (munhão) por meio de um padronizador da pressão de assentamento e levado aos respectivos microscópios para leitura de desajuste marginal e rugosidade de superfície. Para a avaliação do desajuste marginal foi calculada a media das distancias da borda da restauração a borda do preparo a partir de um ponto inicial aleatório selecionado sobre a margem cervical do coping. Duas leituras eram realizadas a cada ¼ de volta, totalizando 8 leituras por coping. Para os dados obtidos, que tiveram distribuição não normal, foi utilizado o teste não paramétrico de Kruskal Wallis e foi observado que a liga VB apresentou menor desajuste marginal (56,92µm) quando comparado a liga Keragen (66,75 µm) com p

As cerâmicas à base de dissilicato de lítio apresentam propriedades mecânicas, resistência química, biocompatibilidade, baixo índice de acúmulo de placa e resultados estéticos favoráveis. Entretanto, sua resistência à fadiga e probabilidade de sobrevida (confiabilidade) em sua forma estratificada e monolítica ainda é pouco conhecida. Este estudo tem como objetivo investigar a confiabilidade e o modo de falha das coroas estratificadas de dissilicato de lítio com e sem modificação do desenho da infraestrutura e de coroas monolíticas quando submetidas ao ensaio de fadiga por intermédio da ciclagem dinâmica em água. Trinta coroas foram divididas em 3 grupos: IEC (coroas estratificadas com infraestrutura convencional), IEM (coroas estratificadas com infraestrutura modificada) e MON (coroas monolíticas). Para os grupos IEC e IEM as infraestruturas apresentavam espessura de 0,8 mm. No entanto, no desenho modificado era adicionado uma cinta lingual de 2 mm de altura conectada a postes proximais de 3,5 mm de altura, ambos com 1,3 mm de espessura. As MON eram compostas inteiramente de dissilicato de lítio e apresentavam espessura oclusal de 1,5 mm. As coroas foram cimentadas em troqueis de resina composta e submetidas a ciclagem dinâmica em água (30-300 N). Um endentador monolítico de dissilicato de lítio aplicava carga axial sobre a crista marginal mesial até a fratura, e posteriormente na crista distal. Ao final, as coroas eram analisadas em estereomicroscópio e no microscópico eletrônica de varredura (MEV) para caracterização e classificação dos danos. As falhas encontradas nas coroas foram registradas a cada 125.000 ciclos. A distribuição Weibull a 2 parâmetros (Synthesis 9, Weibull ++; Reliasoft, Tucson, AZ, USA) foi utilizada para calculo da probabilidade de sobrevida em 1, 2 e 3 milhões de ciclos. Comparações entre os grupos também foram realizadas com o módulo de Weibull e a resistência característica (número de ciclos decorrido até a fratura). Tanto em 1 quanto em 2 milhões de ciclos, a probabilidade de sobrevida foi significativamente baixa para as IEM em relação as MON e as coroas IEC não apresentaram diferença entre as IEM e MON. Em 3 milhões, apenas as coroas monolíticas mantiveram a confiabilidade, considerandoque diminuiu significativamente para as estratificadas, independente da modificação da infraestrutura. Fraturas envolvendo os postes proximais e/ou a cinta lingual foram observadas para as IEM, enquanto as IEC o modo de falha predominante foi a fratura coesiva da porcelana de revestimento. As MON também apresentaram fraturas coesivas. As marcas fractográficas identificaram a superfície de contato com o endentador como origem das fraturas. Em conclusão, a alta confiabilidade foi observada para as coroas MON em 3 milhões. As coroas estratificadas não se beneficiaram da modificação das infraestrutura, pois não houve diferença na confiabilidade entre elas nos 3 tempos avaliados. Além disso, o modo de falha no grupo IEM não restringiu a fratura coesiva da porcelana, com presença de fraturas na infraestrutura. Falhas coesivas foram observadas apenas na porcelana de revestimento das IEC e na cerâmica no grupo MON. Lithium disilicate glass-ceramic provides desirable mechanical properties, chemical resistance, biocompatibility, diminished plaque accumulation, esthetics, and favorable esthetic results. However, the fatigue life and probability of survival (reliability) of lithium disilicate in its monolithic or layered form is still poorly understood. This study aimed to investigate the reliability and failure modes of porcelain veneered lithium disilicate crowns with and without core design modification, and of monolithic crowns when subjected to cyclic fatigue in water. Thirty lithium disilicate molars crowns were made and divided into 3 groups: IEC (bilayer crown with even thickness coping, i.e. conventional core), IEM (bilayer crowns with modified core design) and MON (monolithic crowns). For groups IEC and IEM, copings presented an even thickness of 0.8 mm and the modified design consisted of 1.3 mm thickness with a lingual margin of 2.0mm height connected to full contour proximal struts of 3.5 mm height. Monolithic crowns had an occlusal thickness of 1.5 mm. Crows were luted on composite resin abutment replicas and subjected to cyclic fatigue in water (30-300 N). A monolithic indenter of lithium disilicate was used to deliver the load on the mesial marginal ridge until failure, then the same procedure was performed in the distal ridge. For failure characterization crowns were analyzed in stereomicroscope and scanning electron microscope (SEM). Failure inspection was performed every 125,000 cycles. The 2-parameter Weibull distribution (Synthesis 9, Weibull ++; Reliasoft, Tucson, AZ, USA) was used calculate the probability of survival at 1, 2, and 3 million cycles. Comparisons between groups were also made for Weibull modulus and characteristic strength (number of cycles elapsed until failure). At both 1 and 2 million cycles, reliability was significantly lower for IEM relative to MON and IEC showed no difference between the IEM and MON. At 3 million cycles, only monolithic crowns maintained the reliability, whereas it significantly decreased for porcelain veneered crowns, regardless of core design modification. Fractures involving the proximal struts and/or lingual collar were observed for IEM crowns, whereas IEC crowns chiefly presented porcelain cohesive failures. MON crowns fractured cohesively. All fractures started occlusaly, as depicted by telltale fratographic marks. In conclusion, the highest reliability was observed for MON crowns at 3 million cycles. Layered lithium disilicate crowns did not benefit from framework design modification, as there was no difference in reliability between them in 3 times evaluated. Also, failure modes differed between groups and IEM did not hinder porcelain cohesive failures, instead fractures involving the framework were observed. Cohesive failures were observed only for the porcelain veneer of IEC, and of the lithium dissilicate material in the MON group.

O implante dental depende do osso de suporte para sua estabilidade e ongevidade funcional. O comportamento mecânico e a estrutura trabecular do osso afetam a interface com o implante. Tal conhecimento pode fornecer uma base para melhoramentos na função e desenho dos implantes atuais minimizando a reabsorção da crista óssea e falha na junção osso-implante. Desta forma a correta quantificação das forças que atuam sobre o sistema de implante e principalmente no osso de suporte ao qual ele está inserido é importante para o entendimento da biomecânica possibilitando que intervenções possam ser realizadas pelos profissionais visando assim à longevidade das próteses implanto-suportadas bem como dos implantes que as sustentam. Por essa razão, a proposta deste trabalho foi avaliar, com auxílio de extensômetros elétricos, se o processo laboratorial de confecção de coroas metalocerâmicas resulta em alterações das tensões no osso ao redor dos implantes. Para isto foi utilizado um modelo de poliuretano em forma de U simulando o osso mandibular com dois implantes de hexágono externo de 3,75mm de diâmetro por 13 mm de comprimento, nos quais foram fixados intermediários multi-unit. Os corpos de prova foram confeccionados com dois tipos de ligas odontológicas - Cobalto-Cromo e Paládio-Prata - e três tipos de cilindros protéticos calcinável, usinado de Cobalto-Cromo e usinado de Ouro. As leituras de deformação foram realizadas em dois momentos: 1- após a fundição das infra-estruturas e 2 após estas infra-estruturas terem recebido cobertura cerâmica. Os testes foram realizados parafusando os corpos de prova sobre os intermediários utilizando-se para isto um dispositivo eletrônico de torque com força máxima de 10 Ncm. Os resultados mostraram que, após a aplicação da cobertura cerâmica, ocorreu piora da condição de assentamento aos intermediários. O mesmo não foi detectado quando se avaliou a deformação do osso simulado, já que os valores de deformação não ndicaram diferenças antes e após a aplicação da cerâmica. The dental implant depends on the supporting bone for its stability and functional longevity. Mechanical behavior and trabecular bone structure affect the interface with the implant. Such knowledge may provide a basis for improvements in the current implant function and design, decreasing bone crest resorption and failure at bone-implant junction. Adequate quantification of forces that act upon the implant system and mainly on the supporting bone is important for understanding the biomechanics, allowing the intervention by professionals with the purpose of achieving the longevity of implant-supported prostheses. Therefore, this work aims at evaluating, with the aid of strain gauges, whether the laboratorial process of metal ceramic crown fabrication results in changes of the tensions around the implants. A U-shaped polyurethane model simulating the mandibular bone with two 3.75-mm diameter and 13-mm length external hexagon implants were used with fixed multi-unit abutments. Specimens were prepared with two types of dental alloys - cobalt-chromium and silver-palladium - and three types of prosthetic cylinder castable plastic, prefabricated in cobalt-chromium or gold. The deformation readings were performed in two moments: 1- after framework casting and 2- after ceramic layering of the framework. The tests were performed with the framework screwed onto the abutments at 10Ncm using an electronic torque device. The results showed that the ceramic layering worsened the fit between the crowns and the abutments. The same was not detected when bone deformation was evaluated since the values were not statistically different.

O assentamento passivo tem sido considerado um dos mais importantes requisitos para o sucesso de próteses implanto-suportada. Este estudo in vitro investigou a deformação do intermediário de prótese implantosuportada após o aperto do parafuso tanto do cilindro de Paládio-Prata como de Cobalto-Cromo. Um modelo mestre foi usado para simular uma mandíbula humana com cinco implantes. Extensômetros foram colados nas faces mesial e distal de cada intermediário para registrar as deformações causadas pelos cilindros após o aperto dos parafusos. Os intermediários foram montados sobre as réplicas dos implantes e os parafusos foram apertados com um torque de 20 Ncm e as leituras foram gravadas. Após este passo, os parafusos tanto dos cilindros de Paládio-Prata como de Cobalto-Cromo foram apertados com um torque de 10 Ncm e as leituras também foram gravadas. Estas medições foram repetidas por cinco vezes. O teste estatístico de Mann-Whitney foi aplicado aos resultados. Nenhuma diferença estatística foi encontrada entre as tensões geradas tanto pelos cilindros de Paládio-Prata como os de Cobalto-Cromo. No entanto, existiram diferenças com relação à qualidade da tensão. A deformação gerada pelo aperto dos parafusos dos cilindros de Cobalto-Cromo foi de compressão e o aperto dos parafusos dos cilindros de Paládio-Prata gerou forças de compressão e tração. Passive fit has been considered one of the most important requirements for the success of implant supported prostheses. This in vitro study investigated the abutment deformation of an implant-supported prosthesis after screw tightening of palladium-silver and cobalt-chromium prosthetic cylinder. A master model was used to simulate a human mandible with five implants. The Strain gauges were attached on the sides of each abutment to capture deformations because of the cylinders screws after was tightened. The abutments were mounted onto implant replicas and the screws were tightened to a 20 Ncm torque, and the readings were recorded. After this step, palladiumsilver and cobalt-chromium prosthetic cylinders were tightened to a 10 Ncm torque and the readings were recorded. The measurements were repeated five times. Mann-Whitney statistical test was applied to the results. No statistical differences were found between the deformation generated by palladium-silver and cobalt-chromium prosthetic cylinders. However, there were differences relative to the quality of the strain. The deformation generated by screw tightness of the cobalt-chromium prosthetic cylinders was compressive while palladium-silver prosthetic cylinders generated compressive and tensile strain.