Objective : To obtain objective average measurements of the profile and frontal facial soft tissue to be used as a guide for aesthetic treatment goals. Methods and Materials : This observational study included 110 females and 130 males high school students aged 16-18 years. None of the subjects had any facial deformities. All of them and their parents gave consent to take part in this study. In each case, two standard photographs of profile and frontal views were taken 27 landmarks were digitized on photographs. The mean, standard deviation, and range for a total of 43 facial indices were calculated digitally by computer software. The Student’s t-test was used to compare males and females. Results : The ratio between the lower and middle facial thirds was one to one, but the height of the upper facial third was proportionally smaller than the other two-thirds in both sexes. Boys had greater nasal length, depth, and prominence than girls with statistically significant differences. Both upper and lower lips were more prominent in girls than in boys. All measurements of the chin showed sexual dimorphism characterized by greater chin height and prominence and deeper mentolabial sulcus. Boys had greater facial dimensions than girls. Mouth width, nasal base width, and intercanthal distance were significantly greater in boys. Conclusion : The labial, nasal, and chin areas showed sexual dimorphism in most of the parameters used in this study. Boys had larger faces, greater facial heights, longer nasal, labial, and chin lengths, and greater nasal, labial, and chin prominence.

When cases of dental crowding are identified and diagnosed promptly, interceptive orthodontics is particularly successful. Aim: To assess the differences in the eruption sequence of the mandibular canine and first premolar teeth in children with and without dental crowding. Materials and Methods: Children who attended the Shiraz Dental School's orthodontic clinic (Iran) from September to December 2012 were enrolled in this case-control study. Tooth size arch length discrepancy (TSALD) of all 8-10 year olds was calculated from patients’ dental models. Thirty-six children were randomly selected from those with TSALD of equal or less than 4mm (those with crowding). Each selected case was matched for sex and age with another child (as control) with TSALD>−4mm attending the same clinic, in the same time period. The existing panoramic radiographs were traced and the eruption percentages were measured for mandibular canine and first premolar teeth. The mean difference between canine and first premolar eruption percentages was compared between the case and control groups using the SPSS (version PASW 18) software and a paired sample t-test. Results: Canine and first premolar eruption percentages in the case group were 65.82±13.00 and 78.92±10.15 percent, respectively. The mean eruption percentages for canines and first premolars of the control group were 74.12±14.55 and 75.47±11.60 percent, respectively. There was a significant difference in pre-eruptive positions of canine and first premolar teeth in those with moderate to severe crowding when compared to the control group (p<0.001). Conclusion: These findings may improve the early diagnosis of children with high risk of developing moderate to severe crowding during mixed dentition.

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Background: Malocclusion, one the most important oral health problem among children and young adults, leads to social stigma and psychological disorders. Early orthodontic treatment for children appears to be one of the efficient methods to prevent these consequences. Materials and Methods: This cross-sectional study, which was conducted in Shiraz, city of Iran, comprised 1600 primary school children aged 7 and 8 years old from 16 schools in the 4 districts of Shiraz. Self-administered questionnaires, giving scores to parental knowledge and attitude towards early orthodontic treatment, were designed and distributed to the children to deliver them to their parents. The maximum possible mean score for both knowledge and attitude questions were. Results: Out of 1600, 1026 (64%) questionnaires were returned. The analysis revealed the mean score of parental knowledge and attitude as 0.78 and 0.38 respectively. The mean score of participants from high social class was significantly higher in the knowledge and attitude sections (P value < 0.001). Highly educated parents presented an appreciably greater level of attitude score (mean score: 0.43, P value < 0.001). A remarkable correlation of parental former orthodontic treatment with a routine and problem-based visit of a dentist was observed [odds ratio (OR): 3.1, 95% confidence interval (CI): 2.1 to 4.4] and (OR: 3.1, 95% CI: 2.2 to 4.4) in order. Conclusions: This study showed significant effect of higher social class on the parents' knowledge and attitude and also beneficial impact of higher educational level on parents' attitude. The parents, who were former orthodontic patient, were more concerned about their children's dentofacial health.

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