Department of Pediatric Dentistry, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil, Phone: +5511995026484, e-mail:
Faculty of Dentistry, Tanta University, Egypt.
J Contemp Dent Pract. 2020 Sep 1;21(9):977-981.
To compare the condyle sagittal position of class I and class II division 2 in orthodontic patients.
Fifty orthodontic cases (30 females and 20 males; 12-31 years) from the records of an Orthodontic Graduate Program were collected. Such cases presented cone-beam computed tomography (CBCT) as part of their initial diagnostic examinations. The study sample constituted two groups, class I and class II division 2 groups. A previously calibrated examiner performed the measurements of the images, representing the distance between the condyle and the articular surface of the glenoid fossa, both anteriorly (anterior disk space-ADS) and posteriorly (posterior disk space-PDS). Descriptive statistics were performed. Data were normally distributed, and parametric tests were used. Paired sample test was used to identify differences between the right and the left joints. Differences between class I and class II/2 groups were tested using independent test. All statistical tests were interpreted at 5% significance level.
When the study groups were compared in relation to the dimensions observed for the right and the left ADS and PDS, no significant differences were detected. This study also calculated the differences between right and left disk spaces within the groups, and the differences were not significant for both class I and class II/2 groups.
The results demonstrated, after the performance of a CBCT comparative analysis, that there is no significant difference between class II/2 and class I orthodontic patients in relation to the condyle sagittal position.
The results collected here refute the expectation of spontaneous mandibular anterior repositioning after correcting the overbite in class II/2 patients.
比较正畸患者中安氏 I 类和安氏 II 类 2 分类错牙合患者髁突矢状位置。
从一个正畸研究生项目的记录中收集了 50 例正畸病例（30 名女性和 20 名男性；12-31 岁）。这些病例在初始诊断检查中进行了锥形束 CT（CBCT）检查。研究样本由两组组成，即安氏 I 类组和安氏 II 类 2 分类组。一位经过校准的检查者对图像进行了测量，代表了髁突与关节窝关节表面之间的距离，包括前部（前盘间隙-ADS）和后部（后盘间隙-PDS）。进行了描述性统计。数据呈正态分布，使用参数检验。配对样本检验用于识别右关节和左关节之间的差异。使用独立样本检验检验安氏 I 类组和安氏 II 类 2 分类组之间的差异。所有统计检验均在 5%显著性水平下进行解释。
当比较右和左 ADS 和 PDS 观察到的维度时，研究组之间没有发现显著差异。本研究还计算了组内右和左盘间隙之间的差异，对于安氏 I 类和安氏 II 类 2 分类组，差异均不显著。
经过 CBCT 对比分析后，结果表明，安氏 II 类 2 分类和安氏 I 类正畸患者的髁突矢状位置之间没有显著差异。
这里收集的结果反驳了在纠正 II 类 2 分类患者深覆合后，下颌前牙会自发复位的预期。
