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Aims: The aims of this study were to determine the prevalence of Bolton intermaxillary tooth-size discrepancy among Saudi orthodontic patients and to evaluate gender differences. Materials and methods: Pretreatment study models of 98 Saudi orthodontic patients (45 men and 53 women) were included in this study. The mesiodistal width from 1st molar to the opposite 1st was measured by a digital caliper, and Bolton anterior ratio (BAR) and Bolton overall ratio (BOR) were calculated. The independent samples t-student test was used to compare the values of BAR and BOR between men and women. The Chi-square test was used to test the gender differences in patients having Bolton tooth-size ratio away from 2 SD of Bolton mean value. Results: Significant differences were not found between men and women in BAR and BOR. The frequency of intermaxillary tooth-size discrepancy was 21.6% and 17.3% for anterior and overall ratio, respectively. Significant differences were found between men and women in the anterior and overall intermaxillary tooth-size discrepancy. Conclusion: Male orthodontic patients possess significantly more anterior and overall intermaxillary tooth-size discrepancies than female patients. Furthermore, the prevalence of Bolton tooth-size discrepancy in Saudi orthodontic patients is quite large enough to lead clinicians to be aware of it and proceed Bolton index in their quotidian orthodontic diagnosis. Clinical significance: The failure to diagnose intermaxillary tooth-size discrepancies prevents obtaining optimal occlusal relationship and increases the duration of the orthodontic therapy. Clinicians must consider Bolton tooth-size analysis as a primordial tool in their quotidian orthodontic diagnosis process and treatment planning so that they can avoid embarrassing situations at the end of the treatment.

Frequency of Bolton Tooth-size Discrepancy among Saudi Orthodontic Subjects and Relevance in Concordance with Gender Predilection