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Objective: The purpose of this study was to investigate the prevalence of subdivision malocclusions in Class II/1 and Class II/2 patients and to see if the II/2 group had greater skeletal asymmetry. Materials and methods: From a sample of over 1500 records, 256 Class II malocclusions met inclusion criteria. Of these, 214 were Class II/1 and 42 were Class II/2. Seven landmarks identified on CBCT scans were used to make 8 bilateral linear measurements. Right and left side differences were calculated for each subject, and median values were compared. Linear measurements from the Class I side of the subdivision malocclusion to the Class II side were compared. Results: 22.9% of II/1 subjects had a subdivision malocclusion versus 50% of the II/2. Significant side-to-side differences existed between II/1 and II/2 subjects in two of eight measures. There were greater differences in the II/2 group between the Class I side of subjects to the Class II side than in the II/1 group. Conclusion: All mandibular variables indicated greater degrees of mandibular asymmetry in the II/2 group; only Co-Po proved statistically significant.

Studying the Prevalence and Etiology of Class II Subdivision Malocclusion Utilizing Cone- Beam Computed Tomography