Bolton’s Ratios for Patients with Different Angle’s Malocclusions Seeking Orthodontic Treatment in Kurdistan Region

Aims: The study aimed to evaluate the overall and anterior Boltons ratio between females and males of the Kurdistan population, and then compare it to Boltons original ratio. Materials and methods: This cross-sectional study consisted of 160 orthodontic models (80 males, 80 females) that randomly selected from the Kurdistan Iraq population for patients seeking orthodontic treatment, ranging in age from 16 to 34 years. After evaluating the width of each tooth separately using digital caliper, anterior and total ratios were calculated by a formula presented by Bolton. Results: The studys overall Boltons ratio was significantly higher for both females and males at 92.54 and 91.73, respectively, when compared to that of Boltons original value of 91.3; the anterior Boltons ratio was also significantly higher at 79.97 for males & 79.22 for females, when compared to that of Boltons original value of 77.2. The high significant difference was observed between the current study and Boltons ratios, with p-value of 0.01, whereas no significant gender differences in any malocclusion group have been found. Conclusions: No gender effect on Boltons ratios among all Angles classification types.