[Prevalence of dentoalveolar malocclusions in patients with temporomandibular disorders, referred to dental school of Ahvaz]

Temporomandibular disorders [TMD] is one of the most common problems in the head and neck area. Depending of its indexes, the prevalence of TMD among different societies has been reported differently by various researchers. The aim of this study was to determine the incidence of types of malocclusion in patients with temperomandibular disorders referred to dental school of Ahvaz during 2005-2006 This descriptive cross -sectional study was based on interview and observation of 216 twenty to sixty year old patients with the average of 31.6 years of age that suffering from TMD. To determine the relationship between malocclusion and TMD the SPSS software and proportional comparison test was used. The prevalence of TMD was 59.76% in females, 40.3% in males and 50.9% in patients between 20 to 30 years old. The most common sign of TMD was joint sounds [61.1%] and the less common was limitation in lateral jaw movement. 15.7% of the patients had normal occlusion, 58.8% Cl one malocclusion, 9.8% Cl two d1 malocclution, 11.5% Cl two d2 malocclusion, 4.2% Cl three malocclusion, 10.6% Crossbite, 8.3% open bite, 40.8% abnormal overjet, 30.1% abnormal overbite, and 59.8% had crowding. The prevalence of TMD was higher in females than males, and the age of prevalence was 20-30. The most common sign of TMD was joint sounds and the less common was limitation in lateral jaw movement. The prevalence of posterior open bite and decreased overbite in TMD group was significant [p=0.000], but there was no relationship between other types of malocclusion and TMD

[Evaluation of the effect of repetition of oral health education in 9-10 years old students' plaque index]

Oral health education is an important subject in life-long prevention of dental problems. The aim of this study was to assess the effects of repetition of oral hygiene instruction in a group of 9 to 10 years old students in the Ahvaz. The students were 364 boys and girls of grades 3 and 4 in the primary school. Before the begging of the teaching program, all the students were examined. Their oral hygiene was verified using the simplified index of the oral health offered by Green-Vermillion [CI-S, DI-S, OHI-S] and gingival health was recorded with the diagnostic standard of [James, Jackson, Stack and Lawton] in exacting of the teaching program. The students were divided into 4 groups the number of teaching sessions and the period between them were different in these groups: group once every two weeks and totally 6 times, group two: monthly and totally 3 times, group three a single session and group four [control] were not trained at all. An educational film with supplementary oral explanations and simplified educating were used as means of training. After completion the education sessions, sanitary daily practices and the oral conditions of student were re-examined. The results were evaluated with chi-square, ANOVA and t- tests and accepted result is being statistically significant at P<0.05. Thirteen students dropped from the study, finally the 351 remaining students were examined and the results were as follows. The medium OHI-S and DI-S in the group one at the final examination showed a meaningful decrease compared with the first examination, but for the CI-S medium were not a meaningful difference compared with the first examinations. As for gingival health condition, in the all groups with training, students had improved their gingival from poor oral hygiene to medium or good health. These results showed that importance of oral hygiene instruction and follow up via repetition of it is very obvious. Repetitive oral hygiene instruction via school based programs, are very useful for improvement of students motivation