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Introduction Dimensional stability of removable dentures in various disinfecting agents is considered an important and necessary property. The purpose of this study is to evaluate the dimensional stability of two types of heat-cured acrylic after immersion in distilled water, ozonated water and sodium hypochlorite solution. Material and Method In this in-vitro study, 60 disk-shaped samples were made, including 30 samples of Acropars heat cure acrylic resin and 30 samples of Pro Base heat cure acrylic resin. 30 samples of each acrylic were divided into three subgroups (n=10): 1) Immersion for 8 hours in distilled water (control group). 2) immersion for 8 hours in 1% sodium hypochlorite and 3) immersion for 8 hours in ozonized water. After every 8 hours, the solutions were changed and all samples were placed in disinfectant solutions for 16 weeks. Before and after immersion in each of the environments, the diameter of the samples was measured with an accurate micrometer with an accuracy of 1 micron. Finally, the obtained data were analyzed through appropriate statistical tests. Results Results showed that the dimensional changes of Pro Base heat cure acrylic resin by immersion in any of the 1% sodium hypochlorite solutions, ozonated water and, distilled water are not significant, and the dimensional changes of Acropars (Iranian) acrylic resin are not also significant in each of these solutions. Therefore, both disinfectant solutions are suitable for disinfection of dentures. Conclusion After 16 weeks of immersion, the change in dimensions of heat cure acrylic resins in ozonated water is clinically acceptable, and according to the confirmation of the appropriate disinfection property of ozonated water in previous research and further studies, it can be suggested to the patients as a suitable disinfectant for disinfection of dentures. [ABSTRACT FROM AUTHOR]

Background and Aims: Different materials have been used to make dentures during different years. Teeth used in making dentures should have appropriate physical and mechanical features to meet the needs of masticatory functions, meanwhile having desired beauty. The aim of the present study was to determine the frequency of previous denture material and f its form and the duration of use in patients referring to the prosthesis department of Tabriz Dental School during 1385 to 1395. Materials and Methods: This cross-sectional descriptive study was performed on the basis of paraclinical examination on all cases of removable prostheses in patients referring to the department of prosthodontics of Tabriz University of Medical Sciences from 1385 to 1395. Based on the files, the percentage of frequency of previous denture type, previous denture tooth material, previous tooth form, previous time of denture using during the day and night were statistically evaluated by SPSS20 software. Results: The results of this study showed that out of 471 patients, 151 people used removable dentures. A study of previous denture material showed that the frequency of using dentures containing resin teeth with 48.3% was much higher than porcelain teeth with 13.8. Examination of the dental form showed that in 13.8%, the dental form was with a cusp, in 48.3% without a cusp and in 37.9% the type and form of the teeth were not clear (P

Introduction: Immune Thrombocytopenia (ITP)is characterized by its autoimmune response to platelet degradation. The manifestations in symptomatic patients include bruising and multiple bleeding caused by a decrease in the number of platelets. Case report: This case report presented a 75-year-old male patient referred to the Department of Oral and Maxillofacial Diseases affiliated to the School of Dentistry, Mashhad University of Medical Science, Mashhad, Iran, with a chief complaint of ill-fitting dentures in the last 10 days. The oral examination confirmed the presence of purpura and ecchymosis on the palate and two hemorrhagic bullae on the right mandibular ridge. Moreover, bruisesand red macules were observed on his legs during the clinical examination. The patient was prescribed to receive an emergency blood test. He was referred to the hospital after the diagnosis of severe thrombocytopenia and the possible diagnosis of ITP or leukemia. Eventually, the diagnosis of ITP was confirmed, and he was subjected to a high dose corticosteroid therapy and chemotherapy with intravenous rituximab. The patient recovered fully after two follow-ups within one year. Conclusion: It is of utmost importance to do oral examinations in patients who have ill-fitting and old dentures since theseelderly patients can be more prone to different blood dyscrasias. In some cases, oral changes are among the first manifestations of systemic diseases. Early diagnosis has a dramatic effect on the survival rate of the patients along with early referral for the treatment.

Background and Aims: Different materials have been used to make dentures during different years. Teeth used in making dentures should have appropriate physical and mechanical features to meet the needs of masticatory functions, meanwhile having desired beauty. The aim of the present study was to determine the frequency of previous denture material and f its form and the duration of use in patients referring to the prosthesis department of Tabriz Dental School during 1385 to 1395. Materials and Methods: This cross-sectional descriptive study was performed on the basis of paraclinical examination on all cases of removable prostheses in patients referring to the department of prosthodontics of Tabriz University of Medical Sciences from 1385 to 1395. Based on the files, the percentage of frequency of previous denture type, previous denture tooth material, previous tooth form, previous time of denture using during the day and night were statistically evaluated by SPSS20 software. Results: The results of this study showed that out of 471 patients, 151 people used removable dentures. A study of previous denture material showed that the frequency of using dentures containing resin teeth with 48.3% was much higher than porcelain teeth with 13.8. Examination of the dental form showed that in 13.8%, the dental form was with a cusp, in 48.3% without a cusp and in 37.9% the type and form of the teeth were not clear (P<0.01). Evaluations showed that 24.1% of patients used their dentures only during the day and 41.4% of patients used them overnight. Conclusion: A 10-year study of patients with dentures at the Tabriz School of Dentistry documented the common use of resin teeth denture, as well as overnight use of them and the non-cusp form of denture teeth. [ABSTRACT FROM AUTHOR]

Background and purpose: In tooth selection for dentures, the size of the tooth is really important. To estimate the size, a group of landmarks of the face have been investigated. This study evaluated the relationship between the length and width of maxillary central incisors and measurable indices of the face in patients with complete denture. Materials and methods: A descriptive-analytic cross-sectional study was done in 40 people (mean age: 55 years old) with complete denture in Dental Department affiliated with Mazandaran University of Medical Sciences, 2018. The width of the anterior maxillary teeth in the prostheses was determined based on the corners of the lips and the height of the teeth was determined based on the height of the wax-rim. We also investigated how close was the size of teeth arranged in dentures to interzygomatic width and face height. Results: The mean inter-zygomatic width was 118 mm in males and 120 mm in females, and the mean widths of the maxillary central incisors on dentures in males and females were 8.155 and 7.895 mm, respectively. There was no significant correlation between inter-zygomatic and maxillary central incisor width in dentures among males (P=0.204) and females (P=0.508). In this study, the teeth selected were wider and shorter than inter-zygomatic indices and facial height. Conclusion: The correlation between maxillary central incisor width and bizygomatic width could differ based on gender and genetic and geographical variations. Therefore, these indices should be investigated in different genetic populations. [ABSTRACT FROM AUTHOR]

Background & Aim: Denture induced stomatitis occurs in 24-60 percents of edentulous people who have dentures.Up to now some etiologic factors have been introduced for denture stomatitis but there are some controversies.In some literatures some other microorganisms have been isolated besides candida albicans as main reasons. According to the incidence of denture induced stomatitis and the resistance and recurrence to treatment with antifungal drugs in some of these cases this research was done to evaluate the role of actinomycets in these lesions Material and methods: In this case control study the samples were collected from15 persons with removable full dentures without any denture stomatitis and 15 persons with removable full dentures with denture stomatitis lesions. Both groups were matched according to age, gender،duration of denture wearing ،systemic diseases ,oral hygine, smoking,xerostomia,use of medicines and The samples were transported to the lab in thyo culture and incubated in 37 C for 1 week and then transported to Brain and Heart infusion culture .After sample processing for microscopic evaluation for detecting actinomycets ،the results were analyzed with chi-square test by using spss soft ware version14. Results: The results shows that 5 of 15 (33.3%) in control group and 11 of 15 (73.3%) in case group were actinomycets positive. (p <0.03) Conclusions: It seems that, actinomycets can play a role in denture stomatitis ،besides candida albicans. [ABSTRACT FROM AUTHOR]

Introduction: Temporo-mandibular dysfunction is a general term indicating involvement of masticatory muscles, temporo-mandibular joint or both. The frequency of these disorders has been reported even up to 60-70 % in some societies regarding sub-clinical signs. Unfortunately relevant researches about elderly population seems insufficient; therefore the present study has been designed and accomplished with the aim of frequency evaluation of temporo-mandibular disorders in patients with full denture referring to Prosthesis department of dental college during the academic year 92-93. Methods: In this cross-sectional study, 100 patients were randomly selected among the patients referring to the Prosthesis department during 2013-2014. The required data were collected by the means of Helkimo standard questionnaire plus demographic variants (age, sex, education level and the duration of using denture). The collected data was analyzed by SPSS ver.17 applying Chi-square and Fisher's exact test. Results: 46 patients (46%) were male, 54 patients (54%) were female, and the age range was 35-64 years. The range of using denture was 1-3 years and the mean duration of using denture was 2.52 ± 1.58 years. The most common age range for the relevant disorders was 40-50 years and the frequency of TMD was more in women than in men. Moreover, there was a significant relationship between age factor and Anamnestic index (P=0.037), whereas no significant relationship was observed between frequency of these disorders, level of education and also duration of using previous denture. Conclusion: The study findings revealed that it seems that with increasing age the rate of complaints from TMD problems increases.

Introduction: Inflammatory papillary hyperplasia (IPH) is a benign mucosal lesion that frequently affects palatal mucosa in denture wearers. Notably, most of the cases are asymptomatic but some of the patients feel the burning sensation and discomfort. In this way, IPH is associated with 24hours use of denture especially at night, so the main treatment modalities focused on denture modification and candidiasis infection inhibition. Current article reports a rare case of IPH in a denture free person. Case report: A 29 years old healthy woman referred to department of oral medicine, School of Dentistry Shahid Sadoughi University of Medical Sciences (Yazd, Iran) with complaint of toothache. In our routine intraoral examination, a red pebbly plaque with irregular and poorly defined borders on palatal vault was inspected. Nystatin suspension was advised. Reexamination was done after one week that reduction in lesion size and erythema was observed and the lesion was improved generally. Unfortunately, she didn't represent on next follow-up session for no signs and discomfort. Conclusion: IPH is not always associated with dentures, but also deep and abnormal palate could be the cause of this lesion, requiring multidisciplinary approaches between physicians and dentists' especially oral medicine to resolve this problem completely. [ABSTRACT FROM AUTHOR]

Introduction & Objective: Chemical disinfectants should have minimum side effects on the denture base surface so they can reduce the amount of plaque accumulation. This study evaluates the effect of chemical disinfectants (glutaraldehyde 2% and sodium hypochlorite 1%, 2.5% and 5.25%) on surface roughness of heat cure acrylic denture. Materials & Methods: Fifty specimens were fabricated with the dimensions of 3.1 × 70.2× 10.2× mm from heat polymerized denture base resin. Specimens were randomly assigned to 5 groups (n=10). A group was considered as control group and the other groups were immersed in one of the disinfectants for 10 minutes and then surface roughness of the specimens was measured by profilometer. Data were collected and statistically analyzed by one-way ANOVA test. Results: The surface roughness of specimens immersed in glutaraldehyde was minimum (0.53± 0.14 µ) and had no significant difference with the control groups (P> 0.05). The mean surface roughness of the specimens immersed in sodium hypochlorite 5.25% was maximum (1.06 ± 0.16 µ) and had a significant difference with the other groups (P= 0.000). Conclusion: The surface roughness of heat polymerized denture base resin subjected to sodium hypochlorite 5.25% increased significantly.

مقدمه: با توجه به احتمال آلودگی‏های میکروبی پروتز‏های د‏هانی و به دلیل تماس آنها با بافت‏های د‏هان، بزاق و خون، امکان ایجاد عفونت متقاطع در بین کادر دندانپزشکی، پرسنل لابراتوار‏ها و سایر بیماران وجود دارد. در مورد افراد سالخورده، ضعیف و یا افراد دچار نقص ایمنی، این میکروب‏ها می‏توانند عامل عفونت‏های غیرقابل پیش بینی از جمله عفونت‏های سیستمیک، پنومونی و گاهی بیماری‏‏های قلبی شوند. هدف از انجام این مطالعه، شناسایی میکروارگانیسم‏‏های موجود در سطح پروتز‏‏های متحرک تازه ساخته شده و آماده تحویل به بیمار، توسط لابراتوار‏های شهر یزد بود. مواد و روش‏‏ها: در این مطالعه توصیفی، تعداد 55 پروتز نو و آماده تحویل پنج لابراتوار ساخت پروتز‏‏های دندانی در شهر یزد، به طور تصادفی مورد بررسی قرار گرفت. نمونه‏‏های گرفته شده ابتدا در 100میلی لیتر سرم فیزیولوژی استریل شستشو داده شد و با سانتریفوژ محلول، رسوب حاصله سریعاً بر روی محیط اختصاصی کشت داده شد. میکرو ارگانیسم‏‏های عمدتاً هوازی، بی هوازی و قارچ‏‏های جدا شده مورد بررسی قرار گرفتند. یافته‏‏ها: آلودگی باکتریال در تمامی (100 درصد) و آلودگی قارچی در 2/58 درصد پروتز‏ها مشاهده شد. باکتری‏‏های جدا شده از دنچر‏ها در این مطالعه به ترتیب فراوانی عبارت بودند از گونه‏‏های استافیلوکوکوس‏‏ها، نایسریا‏‏های غیربیماری‏زا، کورینه باکتریوم‏‏ها، استینوباکتر، اشریشیاکولی و باکتری‏های انتروباکتریاسه بودند. به علاوه قارچ‏‏های ساپروفیتی مانند آسپرژیلوس، پنیسیلیوم، موکور و قارچ‏های مخمری از جمله کاندیدا‏ها از دنچر‏ها جدا گردیدند. نتیجه گیری: نتایج مطالعه حاضر نشان می‏دهد که دنچر‏های نو و آماده تحویل به بیماران نیز دارای آلودگی‏های باکتریال و قارچی قابل توجهی بوده و روش‏های پیشگیری و کنترل عفونت در لابراتوار‏ها و مطب‏‏های دندانپزشکی به طور جدی‏تری بایستی مورد توجه قرار گیرد.

Denture stomatotos os a common problem of the denture wears, and its etiology is not clear from the literatures. Some studies show that the aetiology is candida albicans, while other reports point out the other agents including candida albicans. The present study was designed to evaluate the prevalence of oral candidiasis in patients using complete denture with different datas. 50 subjects all wearing complete denture participated in this study. The palatal mucosa was swabbed and swabs were cultured in Sabourauds medium containing 0.005% chloramphenicol then cultures were tested with common mycological lab tests. In 80% of patients oral candidiasis have been diagnosed. In the investigation a direct relation between the oral candidiasis and removal of denture at night, denture cleanliness, presence of any suction and symptoms of denture stomatitis was shown. No relation between the oral candidiasis and sex, smoking habit, succeptible disease, angular cheilitis; the recent condition of denture and the retention of denture were found. The findings of our investigation indicates that candida albicans is the causative agent of denture stomatitis while other factors such as denture cleanliness, removal of denture at night and presence of any suction may be considered as well.