Vernucci R A, Da Mommio L, Vellone V, De Stefano A, Barbato E, Di Giorgio R, Galluccio G
Department of Oral and Maxillofacial Sciences, School of Dentistry, 'Sapienza' University of Rome, Rome, Italy.
Department of Sense Organs, 'Sapienza' University of Rome, Rome, Italy.
Orthod Craniofac Res. 2023 Nov;26(4):576-584. doi: 10.1111/ocr.12652. Epub 2023 Mar 18.
To assess the skeletal and dental maxillary transverse compensation (yaw) on the cone beam computed tomography (CBCT) three-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.
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 five landmarks (three bilateral and two uneven) with respect to a mid-sagittal plane; sagittal analysis was performed by measuring the sagittal distance on the mid-sagittal plane between bilateral points. Means were compared through inferential analysis.
In the condylar hyperplasia group, all differences between the two sides were not statistically significant, nor for canines' difference (P = .0817), for molars (P = .1105) or for jugular points (.05871). In the class III group, the differences between the two sides were statistically significant for molars (P = .0019) and jugular points (P = .0031) but not for canines (P = .1158). Comparing the two groups, significant differences were found only for incisors' midline deviation (P = .0343) and canine (P = .0177).
The study of the yaw on CBCT should be integrated into three-dimensional cephalometry and could help in differentiating the various malocclusion patterns.
在两组均患有III类错牙合且下颌中线偏移的患者的头颅锥束计算机断层扫描（CBCT）三维重建图像上，评估上颌骨横向的骨骼和牙齿代偿（偏斜）情况。
设计了一项观察性回顾性研究，以分析两组患者的差异。第一组由髁突水平增生患者组成，第二组由牙-骨骼不对称III类错牙合患者组成。每组有15名患者。通过相对于正中矢状面测量五个标志点（三个双侧点和两个不对称点）进行横向分析；通过测量双侧点在正中矢状面上的矢状距离进行矢状面分析。通过推断性分析比较平均值。
在髁突增生组中，两侧之间的所有差异均无统计学意义，犬齿差异（P = 0.0817）、磨牙差异（P = 0.1105）或颈静脉点差异（P = 0.05871）均无统计学意义。在III类错牙合组中，两侧之间的差异在磨牙（P = 0.0019）和颈静脉点（P = 0.0031）方面有统计学意义，但在犬齿方面无统计学意义（P = 0.1158）。比较两组时，仅在切牙中线偏移（P = 0.0343）和犬齿（P = 0.0177）方面发现有显著差异。
CBCT上的偏斜研究应纳入三维头影测量中，有助于区分各种错牙合模式。
