الفهرس 
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Abstract
This study was conducted to evaluate the applicability of a proposed linear regression equation for prediction of the combined mesiodistal widths of permanent canines and premolars in a sample of Egyptian adolescents with complete cleft lip and palate (CLP).
Cone beam computed tomography (CBCT) scans belonging to non-cleft individuals and others with different types of complete CLP were used in this study. The study sample was composed of four groups, non-cleft individuals, individuals with unilateral complete cleft lip and palate (UCLP), individuals with bilateral complete cleft lip and palate (BCLP) with rudimentary premaxillae and finally individuals with bilateral complete cleft lip and palate (BCLP) with well-developed premaxillae.
As the proposed equation used the combined mesiodistal widths of the permanent lower incisors (SI) as the predictor for the combined mesiodistal widths of the permanent canines and premolars (A-SCPM), the individual maximum mesiodistal widths of permanent lower incisors, permanent canines and premolars for all individuals in the previously mentioned groups were measured using InVivo® software v. 5 (InVivoDental, Anatomage, San Jose, California, USA) in order to compare their actual to their predicted values, thus testing the equation’s applicability.
After mesiodistal widths of individual teeth were measured, those of the lower permanent incisors were summed to determine the independent variable in the regression equation. In the same manner, measured permanent canines and premolars in each quadrant were summed and those of both sides of each arch were averaged, thus the average A-SCPM (Av. A-SCPM) was determined.
Predicted sum of canines and premolars (P-SCPM) was determined using the measured SI as the independent variable in the prediction equation. The products of the proposed equation represented the dependent variable which was the average sum of permanent canines and premolars of both sides of each arch.The applicability of the proposed linear regression equation was tested by comparing the Av. A-SCPM with the P-SCPM of each arch separately in all groups except for the maxillary arch of the UCLP group as both sides were compared separately to the P-SCPM of the maxillary arch to determine the applicability on the cleft and non-cleft side separately.
The results obtained from this study showed that the linear regression equation proposed by Hammad et al(9) was applicable in predicting combined mesiodistal widths of permanent canines and premolars in non-cleft individuals, mandibular arches of male UCLP individuals, non-cleft sides of maxillary arches of female UCLP individuals, maxillary arches of female BCLP individuals with rudimentary premaxillae and male BCLP individuals with well-developed premaxillae.
However, it was not applicable predicting combined mesiodistal widths of permanent canines and premolars in the maxillary arches of male UCLP individuals, mandibular arches of female UCLP individuals, maxillary cleft side of female UCLP individuals, male BCLP individuals with rudimentary premaxillae, mandibular arches of female BCLP individuals with rudimentary premaxillae and female individuals with well-developed premaxillae.