الفهرس 
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Abstract
Aim:This study was carried out to determine whether any differences exist between normal occlusion and different malocclusions in an Egyptian sample using 3D digital study models with respect to:[1]. Anterior and overall tooth size ratios according to Bolton. [2]. Arch width (intercanine and intermolar widths). [3]. Arch length.[4]. Arch depth. Methodology: This study was performed on 160 orthodontic study models (40 normal occlusion and 120 different malocclusions) at the Orthodontic Department, Faculty of Dentistry, Mansoura University, Egypt, with a minimum age of 13 years. Measurements performed after transforming study models into digital model by a three-dimensional (3D) model laser scanner (3Shape A/S, Copenhagen, Denmark). The digital models were analyzed using OrthoAnalyzer software (3Shape A/S). The data were analyzed using one way Anova and post-hoc tukysignificant changes at (P ≤0.05). Results: TSD:No statistically significant differences were found in the anterior or overall ratio between normal occlusion and different malocclusion groups.Dental Arch Widths (intercanine and intermoalr widths):Although maxillary intercanine widths were larger in normal occlusion and CL I malocclusion but there was no statistically significant difference between each group.Maxillary intermoalr width was significantly narrower in CL III group than normal occlusion, CL I and CL II malocclusion groups.Mandibular intercanine width of CL II malocclusion was significantly wider compared to normal occlusion and CL I malocclusion.No significant differences were found in mandibular intermolar width between each group, although it was wider in CL III group.Dental Arch Length:Maxillary arch length in CL III group was significantly shorter than normal occlusion and CL I malocclusion.Mandibular Arch length in CL II was significantly shorter compared to each group.Dental Arch Depth:Palate was significantly shorter in CL III group compared to normal occlusion and CL I malocclusion.No significant differences were found in mandibular arch depth between groups. Conclusion: Bolton’s values can be used with confidence in an Egyptian sample.Palate was significantly shorter in CL III group compared to normal occlusion and CL I malocclusion.Maxillary intermoalr width was significantly narrower in CL III group than normal occlusion, CL I and CL II malocclusion groups.Mandibular intercanine width of CL II malocclusion was significantly wider c Maxillary arch length in CL III group was significantly shorter than normal occlusion and CL I malocclusion.Mandibular Arch length in CL II was significantly shorter compared to each group.