JOURNAL OF ISLAMIC DENTAL ASSOCIATION OF IRAN (MAJALLAH-I-DANDANPIZISHKI)
Year:2001 | Volume:12 | Issue:4 (35)|Papers Count:8

Evaluation of the lower jaw in complete denture patients against forces and patterns of stress distribution was applied using a FEM three dimensional model of the lower jaw. The Model consisted of a lower jaw bone, covered by membrane, on which a lower denture was placed. The Mode was evaluated using a Sap. 90 software, regarding stress, starin and forces, under different occlusal contacts. Maximum compression stress was concentrated in the mandibular angle and maximum tensile stress was concentrated in the anterior part of condylar head and their location did not change with different patterns of occlusal contact. But, their magnitude did change with the change of the location occlusal contact. Under all circumstances the mandibular foramen region underwent a very low tensile and compressive stress which is most suitable for the physiology of the region.

The post-operative pain management by a single dose of solcosery paste was evaluated. Eighteen patients (nine men,nine women)suffering from mild to moderate adult periodontitis were selected. In The treatment group the solcoserylpaste was applied on the surgical area. There was no significant difference between the treatment control group.

The main goal of this research is the evaluation of enamel bonding agent efficacy in caries prevention after fissure sealant application. Totally erupted and healthy first permanent moralrs in 32 male students between ages 6-9 was chosen. Teeth were divided in to the control and the treatment groups randomly including a tooth in maxilla and a tooth in mandible at apposite site (teeth numbers 3, 19 in control group and 14.30 in examine group and reverse based on standard system). In the treatment group enamel bonding agent was used before fissure sealant application control group was received fissure sealant only.After a year 28 person returned and their teeth were examined for caries. Statistics evaluations with X2 test and a=0.05 showed no difference between two groups.

Where as oral disease demonstrate similar manifestations, we should get a correct diagnosis via diagnostic methods and also clinical signs and symptoms.Nowadays molecular biology is used diagnosis oral lesions (eg. Using biomarkers and gene expressions).Immunocytochemical techniques and monoclonal Abs are used in lichen planus and lesions caused by papilloma virus and also for distinguishing viral Ags in frozen tissue sections.Furthermore Insitu hybridization, which is done with synthetic oligonucleotides, is the most accurate method for HPV diagnosis.The more specific methods (eg. Immunofluorescence) are used in distinguishing DLE, pemphigoid and heterogenous diseases. The researchers are interested in finding genetic changes which result in malignant tumors. P53 mutation, the most common change in cancers, is recognized with polymerize chain reaction (PCR) and molecular tests in tissue sections.Besides mentioned methods, in 90th, decade or'afWrid1and teardteps are by the used diagnostic means.These methods have high sensivity and specificity and it is hoped that we use these faster and cheaper methods which are more accepted with patients.

For determining shirazian cephalometric norms and comparing it with available standards. (Tweed-Downs-Steiner), 30 boys aged between 12-16 years of (averaged 13.8 y/o), that have been selected among 1536 Shirazian students. They all had: normal (CL I) occlusion and good intercuspation, normal overjet and overbite (1-2.5mm), minimum crowding or spacing, and they hadn't any history of pervious orthodontic treatment.Study casts, and lat. cephalometry were prepared form all of the subjects. Cephalograms were traced twice and mean & S.D. of each measurement.Comparison of Shirazian norms with Downs &Tweeds standards revealed that: Facial angle and occlusal plan angle haven't significant different 1?ut,angle of convexity, A-B plane angle, Y-axis angle, IMPA, lower incisor to occlusal plane are more and interincisal angle is less in Shirazian samples than standards and have significant differences (P<0.01). Comparison of our samples with steinets standards showed that differences of ANB & 1 to NB & 1 to NA are significant in conclusion.There is a more convex profile in Shirazian children than Caucasian ones, due to existence of more preognathic maxilla, which is compensated with retrusion of upper ant. teeth, Results shows that it is necessary to have separate norms and standards in different races.

A patient with left palatal expansion which had resulted lack of complete Insertion of maxillary denture approached the hospital Imam Khomaini Dept. merag Tehran University of medical sciences in Tehran, Iran.After polymorphic Adenoma diagnosis, the patient was undergone Hemimaxillectomy surgery with a part of soft palate.Prosthetic treatments on patient were included surgical obturator, Intrim prostheses and definitive prostheses.Then the patient was under control for 22 years and no symptoms of disconfort were observed.

Epidemiological assessment of tongue lesions in 18-28 age groups of Shahid Beheshti dentistry Students 1378.Prevalence of tongue lesions in 18-28age groups of Shahid Beheshti Dentistry Students 1378 was stadied. Numbers of students examined were 290 (33% Females and 67% Males). Prevalence of fissured tongue was 7.6% geographic tongue was 3.1% Atrophic tongue 1.3% Median rhomboid glossitis 0.7%, Ankyloglossia0.7%.

The Angle classification is usually used in epidemiologic studies to categorize the malocclusions. Despite its deficiencies, the angle classification is still one of the best and simplest methods of classification in orthodontics. In most of the previous studies, normal occlusal relationships, ClI, II & III malocclusions and some of their subdivisions (e.g. ClII Div I & ClII cm Dive II) have been evaluated. In this study, 573 boys & girls with the ages within the range of 11-13 years were clinically examined in Mehran city and the frequencies of the malocclusions in the sample were determined with precise statistical methods. In this sample, 74.5% had ClI occlusion. Among them, 56.9% had ClI malocclusion & 17.6% had normal occlusion. The prevalence of ClII & ClIII malocclusions were 14.8% & 10.7% respectively. In this study no statistical significant differences were found regarding the distribution of occlusal relationships, age and gender.