الفهرس 
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Abstract
Ninty patients were recruited in the study. Patients were divided equally into three groups according to Angle classification (I, II, III). Impressions were done for all patients by alginate impression material and poured immediately using certain dental plaster with good dimensional accuracy and surface details reproduction. All casts were trimmed and polished for obtaining high quality study models. Bolton analysis was done by manual and digital techniques for all casts. Paired-samples and ANOVA tests were used to evaluate and compare the measurements within groups and between groups, respectively. There was a good inter-technique reliability of both techniques on calculating anterior ratio for all three classes of malocclusion (MO), and overall ratios in classes I and II. While, there was a moderate inter-technique reliability of both techniques on calculating overall ratio in class III. paired-samples t-test for anterior and overall Bolton ratio by both techniques showed no significant difference. By using ANOVA test, anterior and overall ratios between the three groups of malocclusions by both techniques showed no statistically significant difference. Furthermore, no significant difference in the distribution of anterior or overall tooth size discrepancy categorized by standard deviations of Bolton values among the malocclusion groups with p= 0.405 and 0.737, respectively. Conclusions: Measurements made from digital models appear to be generally as accurate and reliable as measurements made from plaster models. Therefore, digital models appear to be a clinically acceptable alternative to conventional plaster models.