RESUMEN
Orthodontic treatment need and demand in 12-year-olds in Abadeh city has not previously been analysed in relation to geographic origin. The purpose of this study was to assess the12 year old students need and demand for orthodontic treatment. Four hundred seventeen 12-year-old students was selected from public and private schools in Abade [Fars province, Iran]. All the students were examined according to the AC and DHC component of Index of Orthodontic Treatment Need [IOTN] by a trained dentist. Students' and parents' perceived needs were also assessed using AC component and their demand for orthodontic treatment was asked through a questionair. Twenty two percent of the students were in "no need of treatment" group when assessed by DHC component, 29.5% were in "average need" and 48.2% were in "definite need" group. When assessed by AC score, these percents were 61.9%, 29%, and 9.1%. Parents and students percieved need for definite orthodontic treatment according to AC score was 8.6% and 7.7%, respectively. The students and their parents' demand for treatment were 40.6% and 44. 9%, respectively. Orthodontic treatment need in Abade is higher in comparison with other reports according to DHC. DHC is not correlated with orthodontic treatment demand of 12 years old students, but AC had a strong relationship with treatment demand
RESUMEN
Facial vertical variables are important components of soft tissue analysis which are used in clinical esthetic evaluation. The purpose of this study was to evaluate the correlation between vertical skeletal and dental variables of hard and soft tissues of human face. A total of 46 patients [23 boys and girls] were included in this cross-sectional study. Selected angles and facial dimensions were measured during the clinical appointments. For facial proportions, from frontal view, selected reference points were marked on the face. The accuracy of this work was validated by an orthodontist. Hard tissue variables were also measured using patients' lateral cephalograms. Finally, the correlations between soft and hard tissue variables were evaluated using correlation and regression analysis. The statistical analysis showed correlations between number of vertical soft and hard tissue variables, with linear relationship among some of them. Significant correlation was detected between nasolabial angle of soft tissue and hard tissue N-Pog, N-B, N-A, N-Me and Lower incisor to Mandibular plane [P=0.014, P=0.013, P=0.046, P=0.015, P=0.037 respectively]. Also, significant correlation was detected between soft tissue N-Me and hard tissue N-Me, and N-Pog; between soft tissue supraorbital ridge to subnasal and hard tissue N-A, and between soft tissue subnasal to menton and hard tissue A-Me and A-B [P=0.000 in all cases]. The highest correlation was observed between soft tissue subnasal to menton and hard tissue A-Me [R=0.738]. Given the results of this study, it can be concluded that some clinical parameters in vertical dimension, of facial hard tissue variables can be replaced by soft tissue counterparts in order to design the diagnosis and treatment plan according to soft tissue variable measurements