Aims: To estimate multiple regression equation on (88) subjects (48 females and 40 males),for predicting the widths of crowns of unerupted canine and premolar for both jaws and both genders. The subjects had normal class I molar relationship with full permanent dentition. Materials and methods: Plaster models of (88) subjects (48 females and 40 males ).Mesiodistal diameter (MMD) and vestibulooral diameter (VOD) of the crown of cental incisor, lateral incisor,canine,premolars and first molar( I1,I2,C both P1 and P2, and M1) on both sides in both jaws were measured. Multiple regression equations and correlation coefficients between the predictors( central incisor,lateral incisor and first molar) and the criteria variables (canine and premolars) were calculated. The data were analyzed by computerized statistical program SPSS. Results: Gradual regression equations were derived on the basis of measurement result ,by using three to five predictors to predict the sums of width of crown of unerupted canine and premolars using separated equations for both jaws and both genders (i.e four multiple regression equations were prepared).The coefficients of multiple correlations regarding gender and jaws ranged between 0.70-0.79.Conclusions: Establish regression equations, which would give satisfactory correlation coefficient regarding the gender and the jaw varied from 0.70-0.79.

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Aims: The purpose of this study was to determine the age differences for deep bite malocclusion concerning facial skeletal and dentoalveolar height. Materials and Methods: It was carried out on a sample of (50) students (16 males and 34 females), aged (12-15) years with class I deep bite malocclusion present when the incisal edge of the lower central incisor is at least in contact with the gingival third of the upper central incisor in normal healthy individuals with full set of permanent teeth in both jaws. The sample were divided into two age groups (12-13) and (14-15) years old. Lateral cephalometric radiograph was taken for each subject. Twenty-one cephalometric measurements (nine angular and twelve linear) and five ratios had been determined. The data were statistically analysed using statistical package for social statistics. Results: The results revealed that upper anterior facial height, ramus height, total posterior facial height, lower posterior facial height, upper posterior dental height and lower anterior dental height were significantly increase with age in total sample. Males showed increase of total posterior facial height and lower posterior facial height with age while females showed increase of lower posterior facial height and upper posterior dental height with increasing age. Concerning ratios, total posterior facial height to total anterior facial height ratio was increased significantly with age in males opposite to the lower anterior facial height to total anterior facial height ratio which was decreased significantly with age in males. Upper posterior dental height to upper anterior dental height ratio showed significant increase with age in males, females and total sample. Angular measurements revealed that males, females and total sample showed significant decrease of the angle formed by the intersection between occlusal plane and palatal plane (Occ-pp) with increasing age. Conclusions: Deep bite was affected by age only for posterior skeletal facial dimensions and not for anterior skeletal facial measurements.

Aims: The aims of the present study were to describe the morphology of the cervical column in adult patients with a skeletal deep and normal bite occlusion, the prevalence of these morphology within them and to analyse the associations between the morphology of the cervical column and craniofacial parameters. Materials and Methods: The sample of this study composed of two groups, deep bite and normal over bite. The normal or control group composed of 50 adult subjects (25 males and 25 females) aged 18-25 years. The deep bite group composed of 59 adult subjects (20 males and 39 females) aged 18-25 years. Lateral cephalometric radiograph were taken for both normal and deep bite groups. We used 12 variables 11 angular and 1 linear measurements. The morphology of the cervical column was evaluated by visual inspection of the first five cervical vertebrae as they are normally seen in on a standardized lateral cephalometric radiograph. Results: In the skeletal deep bite group, 53.4 per cent had fusion of the cervical column and 23.2 per cent posterior arch deficiency (partial cleft). The fusion always occurred between C2 and C3. In the normal over bite group, 12.9 per cent fusion of the cervical column and 5.35 per cent of posterior arch deficiency, the fusion always occurred between C2 and C3. The significant correlations were seen between fusion and the angle between palatal plane and mandibular plane, the angle formed between the long axis of upper central incisor and palatal plane and the distance between the incisal edges of upper and lower central incisors, also the significant correlation between posterior arch deficiency and the angle between palatal plane and mandibular plane, the angle between the mandibular plane and chin line, gonial angle and the angle formed between the long axis of upper central incisor and palatal plane. Conclusions: The deep bite group had more deviations of the cervical column than the normal group. Our results showed that the craniofacial parameters, occlusion and malformations of the jaws were affected by morphological deviations of the upper cervical vertebrae including fusion and posterior arch deficiency.