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Objectives: The objectives of this study were to identify dental arch widths and lengths of the Yemeni population, identifying any possible sex differences and comparing arch widths and lengths between normal and malocclusion groups. Subjects and Methods: In this investigation, study models of 176 subjects were taken (82 Male, 94 Female) with a mean age of 21.9± 2.8 years. The subjects displayed different types of malocclusions (94 Angle Class I, 37 Class II division1, 36 Class II division 2, and 9 Class III). Results: The maxillary and mandibular dental arch lengths of the male subjects were significantly longer than those of the females. Among the males, maxillary arch widths were significantly larger than the females’, with the exception of the intercanine width. There were no statistically significant sex differences in the mandibular intercanine and first premolar interarch widths found in this study. Male subjects showed significantly wider mandibular interarch widths than females, and this was true for all measured points at second premolar and first molar arch widths. No significant differences were detected between the normal and malocclusion groups in dental arch lengths and widths. Conclusion: There is a tendency for Yemeni females to exhibit shorter dental arch lengths and narrower maxillary and mandibular arch widths than Yemeni males. With regard to dental arch lengths and widths across normal and malocclusion groups, no significant differences were identified.

Dental Arch Dimensions in Normal and Malocclusion Yemeni Samples