Comparison of Mandibular Dental and Basal Arch in Class I and Class II Malocclusions Using Cone-Beam CT

Introduction: Considering the importance of basal bone and dental arch for selecting the treatment plan of orthodontic patients, the present study aimed to assess basal bone and dental arch indexes in Class I and II patients by using CBCT imaging. Methods: Regarding the present study, the CBCT images related to 66 patients referred to the radiology department of Tabriz Dental School and had Class I (0<ANB<4) and Class II (ANB>4) skeletal and molar relationship were selected. The age range of patients was 15-35 years. The data were statistically analyzed in SPSS 23 software in order to evaluate the dental and bone indexes of intercanine and intermolar in patients with Class I and II malocclusion. Results: The dental indexes of intercanine width and ratio and intermolar depth related to Class II patients were obtained higher compared to those in Class I ones (p<0.05), while the intermolar ratio of Class I patients was determined more than that in Class II ones (p<0.05). The higher intermolar width and ratio were observed in Class I patients (p<0.05), while the greater basal arch index of intermolar depth was attained in Class II patients (p<0.05). Conclusion: Transverse dental and basal indexes are consistent, along with a difference in intercanine depth. Regarding dental and bone indexes, a strong correlation between intercanine width, intermolar depth, intermolar ratio and intermolar width and a moderate correlation in intercanine depth are observed in both groups based on correlation results.