上切牙区腭平面角与牙槽嵴顶唇腭径的相关性分析

摘要

Objective:To investigate the association between palatal plane angle (PPA) and the facial-palatal thickness (FPT) of the alveolar bone in maxillary incisor region by using Cone beam computed tomography (CBCT).Methods:A total of 180 cases were collected from a CBCT database, and a three-dimensional reconstruction and parameter measurements each case were obtained with using a NNT Viewer software. A correlation analysis between PPA and FPT of the supporting alveolar bone was performed.Results:Significant positive correlations were found between the FPT of the alveolar bone in maxillary incisor region (χ2=4.758,P=0.014) and PPA (χ2=47.546,P=0.000). The FPT of the maxillary incisor alveolar bone is different. In Angle Class Ⅲ, the AT and PPA is lower than those in Class Ⅰ, Ⅱ. There was a linear relationship be-tween AT and PPA (OR=0.733,P<0.01. Regression equation: AT=9.609-0.026*PPA).Conclusion:CBCT is an ideal method to reveal tooth and alveolar bone morphology prior to implant surgery. The direction of implant placement varies in different malocclusions.%目的：利用CBCT分别测量不同错颌类型的患者上切牙区腭平面角，切牙牙槽嵴顶颌骨唇腭径，为前牙区种植手术提供数据支持。方法：从CBCT数据库中收集符合条件的180例患者资料，其中安氏Ⅰ类者60例，Ⅱ类60例，Ⅲ类60例。利用NNT Viewer软件进行三维重建，并利用软件自带的角度测量工具进行测量。结果：单因素方差分析表明，在安氏Ⅰ、Ⅱ、Ⅲ类患者之间，切牙区牙槽嵴顶唇腭径(χ2=4.758， P=0.014)及腭平面角(χ2=47.546， P=0.000)均存在显著性差异。安氏Ⅲ类唇腭径数值低于安氏Ⅰ、Ⅱ类。腭平面角与对应区颌骨唇腭径呈直线相关关系(OR=0.733， P＜0.01；回归方程：唇腭径=9.609-0.026*腭平面角)。结论： CBCT是较理想的研究前牙种植手术区的工具，在种植手术中不同牙颌类型患者应注意种植方向的选择。