Background: Teeth and arch size determination is an important factor in dentistry and forensic medicine. Evidence shows that cone-beam computed tomography (CBCT) is a highly accurate tool for the measurement of mesiodistal tooth width and arch dimensions. This study aimed to assess the teeth and arch dimensions of males and females on CBCT images of patients presenting to the Radiology Department of Tabriz School of Dentistry.

Materials and Methods: 70 CBCT scans were evaluated in this study by taking into account the age and gender of patients. Mesiodistal teeth width and arch dimensions were measured on CBCT images by an oral and maxillofacial radiologist. The Pearson’s correlation coefficient was used to analyze the correlation between mesiodistal width of the teeth and arch size. An independent t-test was used to compare the mesiodistal width of the teeth and arch size between males and females. All statistical analyses were carried out by SPSS 17 at P<0.05 level of significance.

Results: Significant differences were noted in arch size of males and females in maxillary first premolars, maxillary and mandibular second premolars, and maxillary and mandibular first molars width. The mesiodistal width of teeth #13, 23, 33, 36, and 41 in females was larger than that in males. The mesiodistal width of other teeth was larger in males than females. Arch size and mesiodistal width of teeth were significantly correlated.

Conclusion: Arch size and teeth dimensions in the Iranian population were different from the norms of other countries. Some differences in values were also noted between males and females, which should be taken into account in dental treatments.

Cone-Beam Computed Tomography, Mesiodistal, Dental arch