Search

This study evaluated, by mechanical testing, the strength of four-hole grid plates used for mandibular angle fracture fixation. Much has been discussed about the treatment of mandibular fractures with straight or curved plates. However, there are few studies about the use of grid plates. The geometry of such plates provides three-dimensional stability, resistance against torque associated with a low profile. Ninety polyurethane hemimandibles were used as substratum. The hemimandibles were divided into nine groups and fixation of the fractures was performed varying the type and position of plate and type of screw. An intact hemimandible group was used as control. It was possible to observe that plates positioned at the tension zone present the highest load values, both for dislocations of 3 and 5 mm. There was no statistical difference when plates with or without an intermediate bar were tested. The locking screws were more efficient than the non-locking screws when the plates were positioned at the neutral zone. Results allowed us to conclude that grid plates installed at the tension zone presented greater mechanical efficiency. If grid plates are positioned at the neutral zone, they should have an intermediate bar and be fixed with locking screws.

Cephalometric tracing done manually was considered gold standard for the cephalometric analysis in the last decades. The digital radiographs began to be commonly used in order to make that in a digital way. The objective was to define the accuracy of the predictive and final cephalometric tracings performed manually and virtually. The authors selected 20 patients submitted to bimaxillary orthognathic surgery. The data were collected from lateral cephalometric radiographs, in the preoperative and postoperative periods. The interest were: points, angles (Sella-Nasion to A point angle; Sella-Nasion to B point angle; Frankfurt plane to Mandibular plane angle; Frankfurt plane to occlusal plane angle; Upper and lower central incisors long axes angle; Incisor to Mandibular plane angle; Upper incisor axis to Sella-Nasion plane angle) distances (Co-A; Co-Gn). Data were submitted to the Shapiro-Wilk, analysis of variance, and Kruskal-Wallis tests. The measurement differences were compared using a t test. Descriptive statistics were performed in Excel 2013 and SPSS software, P0.05 being considered significant. No statistically significant difference was found between the mean values predictive and postoperative of the angles and distances within the manual and digital groups. When comparing the means of the differences between the predictive values and the final values, only the 1:1 angle presented a statistically significant difference, indicating a greater accuracy of the digital predictive tracing for this measure. In conclusion, both methods for obtaining predictive tracings are accurate, which shows that clinical results can be successfully simulated by the most accessible technique.

Made available in DSpace on 2020-12-12T02:21:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01 OBJECTIVE: To perform an integrative review associating current literature with a clinical series regarding the use of Le Fort I osteotomy for the removal of tumors located in the midface and central region of the skull base. METHODS: A systematic review was performed through the PubMed, SCOPUS, and Cochrane databases. In addition, 4 different patients operated using the above-cited technique are described in this study. RESULTS: Initially, 123 articles were found. After the removal of duplicates, and title and abstract reading, 27 articles were selected for data extraction. The Le Fort I surgical approach of tumors was performed in 183 patients. CONCLUSION: The Le Fort I surgical approach allows lesion exeresis with good visualization, low rates of recurrences and complications, and without aesthetic compromises for the patient. Department of Diagnosis and Surgery São Paulo State University Division of Oral and Maxillofacial Surgery Department of Diagnosis and Surgery Dental School at Araraquara-UNESP Department of Diagnosis and Surgery São Paulo State University Division of Oral and Maxillofacial Surgery Department of Diagnosis and Surgery Dental School at Araraquara-UNESP

Made available in DSpace on 2022-04-28T19:43:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-07-01 ABSTRACT: Necrotizing fasciitis (NF) is an infection of the deeper tissues that results in progressive destruction of muscle fascia and overlying subcutaneous fat. It has a fast and destructive course. Moreover, it is related to immunosuppression and could be fatal. The aim of this study is to report a clinical case of a young patient, without immunosuppression, who developed NF evolution due to an erroneous diagnosis of abscess at the beginning of the disease. Patient was submitted to broad-spectrum antibiotic therapy and aggressive surgical treatment. Adequate treatment led to a satisfactory evolution in a short period of time. Early recognition and adequate treatment are essential for a favorable prognosis. Department of Diagnosis and Surgery São Paulo State University (Unesp) School of Dentistry Department of Diagnosis and Surgery São Paulo State University (Unesp) School of Dentistry

Made available in DSpace on 2022-04-29T08:32:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-03-01 Objective: The aim of this study was to compare bone formation between 2 distraction osteogenesis protocols by analyzing cone beam computed tomography (CBCT) scan data. Study Design: In this retrospective study, the efficacy of 2 different surgically assisted rapid maxillary expansion protocols (group 1 [G1], 3 × 0.25 mm/d; group 2 [G2], 1 mm start followed by 2 × 0.25 mm/d) was analyzed using CBCT scans obtained at 3 time points: preoperatively (T0), immediately after surgery (T1), and 6 months after surgery (T2). Bone formation at T0, T1, and T2 was analyzed using the Dolphin Imaging 11 program. Results: At T1, both groups had significantly higher bone volume than at T0 (G1, 135.6 vs 124.65 mm3, respectively; G2, 153.49 vs 118.9 mm3, respectively), with no significant difference between groups (P = .6). Moreover, bone density measured in the region of interest was similar between groups at all 3 time points; however, in both groups, bone density was significantly lower at T1 and T2 than at T0 (P < .01), with no difference between T1 and T2. Conclusions: Bone density between the incisors decreased with progressive distraction (i.e., increasing volume), regardless of the distraction protocol used; thus, both protocols can be used safely in clinical practice. Nevertheless, our results indicate that stress should not be applied to the incisors within 6 months of surgery, regardless of the protocol used. Surgeons and orthodontists should therefore consider immature bone formation and avoid using excessive force to close a diastema. Department of Oral and Maxillofacial Surgery Medical University of Vienna. Department of Diagnosis and Surgery Dental School of Araraquara São Paulo State University. Department of Diagnosis and Surgery Dental School of Araraquara São Paulo State University.

Background and Aim Surgically assisted rapid maxillary expansion (SARME) is a surgical technique widely used to correct deficiency of the transverse maxillary dimension. Although some studies investigated the effect of SARME on nasal and facial alterations, there is no evidence that correlates nasal septal deviation (NSD) to SARME as a possible postoperative sequel. The aim of this study is to address and quantify possible variations in the position of the nasal bony septum after SARME and identify any NSD as a postoperative outcome of this surgical technique. Patients and Methods This is a retrospective study, conducted at the Department of Oral and Maxillofacial Surgery of the University Hospital of Araraquara (Unesp, faculty of dentistry), SP, Brazil. Twenty-nine patients who underwent SARME were studied; every patient was evaluated by cone-beam computerized tomography (CBCT) before (T0) and six months after surgery (T1), and we collected the variation of nasal septal position by measuring the distance between the bony septum and the nasal lateral wall. Our measurements were carried out at the level of the head, midpoint and tail of the inferior turbinate. Results A mean NSD ranging from 0.4 to 1.2 mm was measured, and it is more pronounced at the anterior part of the bony septum. Twenty-seven patients (93.1%) presented minor changes in bony septum position; in 2 cases (6.8%), a significant NSD was found (p Conclusion A variation of bony nasal septum position can be expected in any direction after SARME, and it is more pronounced at anterior portion.

Biphenotypic sinonasal sarcoma is a rare and recently recognized entity. It is a low-grade sarcoma which exhibits both neural and myogenic differentiation. The objective of this study is to report a case of a 25-year-old male patient with nasal congestion and bleeding. Computed tomography showed a tumor mass in the nasopharynx. Microscopic analysis showed a cellular proliferation of spindle cells, forming mainly a herringbone-like fascicular growth pattern. Immunohistochemical analysis showed focal positivity for S100, alpha-smooth muscle actin, and calponin, and negativity for desmin, SOX 10, and FXIIIA. We present an uncommon case of biphenotypic sinonasal sarcoma of the nasopharynx and emphasize the importance of recognizing rare entities with impact on the health of these patients.

Necrotizing fasciitis (FN) is a rapidly progressive infection of the deeper tissues with destruction of muscle fascia and a high mortality rate. It is extremely rare and usually it is related to immunosuppression or other systemic debilitating conditions. A 26-year-old white male presented with upper lip edema, with phlogistic signs and infiltration through the infraorbital space along with the presence of tissue necrosis. According to the report, the condition was marked by rapid progression, and the initial manifestation was an acnelike lesion. The treatment was done immediately by incision, drainage, debridement, and installation of drains. The muscle fascia was necrotic, gray, and there was an absence of resistance. Laboratory tests were performed and the microbiologic culture was positive for Staphylococcus aureus. Endovenous antibiotic therapy was administered and the wound was irrigated daily. Healing was completed within a month. NF is a rare infection that must be diagnosed and treated aggressively to avoid tissue loss and to decrease the mortality rate.

O objetivo deste estudo foi avaliar a biocompatibilidade de otólitos de Cynoscion acoupa por ensaios in vivo realizados em ratos Wistar. O material utilizado foi preparado com 2 g de pó de otólitos de Cynoscion acoupa e 0,5 g de colágeno hidrolisado, diluídos em água destilada. O ensaio biológico consistiu na utilização de 24 ratos wistar nos quais foram implantados tubos de polietileno contendo otólitos (OI) no lado direito do dorso e tubos vazios (CI) no lado esquerdo. Após a cirurgia, os ratos foram medicados e sacrificados após 3, 7 e 30 dias. Após cada período os tubos foram removidos com o tecido circundante e submetido a processamento histológico clássico. As alterações inflamatórias foram avaliadas em uma escala de 0 a 4 e submetidas a análise estatística (nível de significância 5%). No CI após o 3º dia, foi observado um infiltrado inflamatório de moderado a severo. No 7º dia, formação de tecido de granulação maduro e com 30 dias presença de um tecido conjuntivo mais organizado. Em relação à OI, moderados leucócitos, infiltrado crônico sem necrose ou reação granulomatosa foi observada no dia 3. No 7º dia, a severidade da reação inflamatória foi atenuada, e um tecido de granulação bem desenvolvido foi observado. No dia 30, o tecido conjuntivo ao redor dos implantes era composto de novos fibroblastos e fibras colágenas onduladas. Não foram observadas diferenças significativas entre os grupos com relação à intensidade da resposta inflamatória em nenhum tempo experimental (p>0,05). Como conclusão, a preparação otólitos foi considerada biocompatível, pois não houve diferenças significativas de reação tecidual entre os grupos experimentais.

PURPOSE:To assess the evolution profile of the immunohistochemical expression of stromal constituents over the time-course of wound healing in a murine model.METHODS: Surgical wounds were performed in the back of 24 Wistar rats. After three, seven, 14 and 21 days, six rats were euthanized and the wounded histologically processed to assess the immunohistochemical expression of CD3, CD20, CD31, α-SMA and type-I collagen. Non-injured skin samples (NSS) were used as control. Data were subjected to statistical analysis using ANOVA and Tukey test.RESULTS: The mean of CD3 and CD20 positive cells in the wounds was significantly higher than in NSS at seven and 14 days (p