Orthod Craniofac Res. 2023 Mar 13. doi: 10.1111/ocr.12652. Online ahead of print.
OBJECTIVES: To assess the skeletal and dental maxillary transverse compensation (yaw) on the CBCT 3-dimensional reconstructed image of the skull in two groups of patients, both clinically affected by a class III malocclusion with deviation of the lower midline.
MATERIALS AND METHODS: An observational retrospective study was designed to analyse differences in two groups of patients, the first one was composed by patients affected by horizontal Condylar Hyperplasia, the second one by patients affected by dento-skeletal asymmetric class III malocclusion. Each group was composed by 15 patients. Transverse analysis was performed by measuring 5 landmarks (three bilateral and 2 uneven) with respect to a Mid-Sagittal Plane; sagittal analysis was performed by measuring the sagittal distance on the Midsagittal Plane between bilateral points. Means were compared through inferential analysis.
RESULTS: In the Condylar Hyperplasia group, all differences between the two sides were not statistically significant, nor for canines’ difference (p=0.0817), nor for molars (p=0.1105) nor for jugular points (0.05871). In the class III group, the differences between the two sides were statistically significant for molars (p=0.0019) and jugular points (p=0.0031) but not for canines (p=0.1158). Comparing the two groups, significant differences were found only for incisors’ midline deviation (p=0.0343) and canine (p=0.0177).
CONCLUSION: The study of the yaw on CBCT should be integrated into 3-dimensional cephalometry and could help in differentiate the various malocclusion patterns.