Methods: This study was conducted on 36 adolescents (14 male, 22 female), with normal occlusion. The depths and width of the dental arches at the first molar region were measured with a laser scanner device. Molar Facial-Axis Point (FA Point) was used as a reference point on the casts. The Kolmogorov-Smirnov Test, paired and unpaired t–test were used for statistical analysis. Statistical package for Social Sciences version 17.0 for Windows (SPSS Inc, Chicago, Ill) was used to perform all of the statistical analyses.
Results: The mean value for maxillary and mandibular inter molar width was 60.16 mm and 57.20 mm respectively. The mean value for maxillary and mandibular inter molar depth was 31.91 mm and 28.72 mm respectively. It was concluded that gender dimorphism does exist only for maxillary inter molar width (P<0.008).
Conclusions: A beta function formula for maxillary arch form prediction was generated using mandibular inter molar width and depth data.