【摘要】 目的 应用锥形束CT(CBCT)转化侧位片探究山东地区不同垂直骨面型成人安氏Ⅱ类错(牙合)患者的前牙、后牙及上颌(牙合)平面倾斜度特点，比较其与正常(牙合)患者的差异，为矫正安氏Ⅱ类错(牙合)提供治疗思路和策略依据。方法 选取2017年12月～2020年6月青岛大学附属医院口腔正畸科收治的123例正畸患者CBCT头颅造影(CCB)为研究对象，其中89例成年安氏Ⅱ类患者作为实验组，34例为对照组，利用CBCT三维影像转化得到矫正前的头颅侧位片并进行测量，根据FH平面与下颌平面之间的夹角(FH-MP)及SN平面与下颌平面之间的夹角(SN-MP),将患者分为3个不同垂直骨面型的实验组。选取34例安氏Ⅰ类均角患者作为对照组。将实验组测量结果与对照组测量结果进行对比，分析各测量指标的数据差异。结果 Ⅱ类高角组前牙(牙合)平面倾斜度为(14.73±3.76)°,后牙(牙合)平面倾斜度为(21.42±5.77)°,两者均较Ⅱ类均角组及低角组更大(P<0.05),与对照组前牙及后牙(牙合)平面之间同样有明显差异(P<0.05)。上颌第二磨牙的高度从低角组到高角组依次减小，各组间差异显著(P<0.01)。结论 不同垂直骨面型的安氏Ⅱ类错(牙合)具有不同的平面倾斜度特征。Ⅱ类高角组前牙及后牙(牙合)平面较均角组、低角组及对照组陡。其中后牙(牙合)平面倾斜度的差异主要由上颌第二磨牙的垂直高度不同造成。更多还原

【Abstract】 Objective To investigate the cant of the occlusal planes in Chinese adult class Ⅱ malocclusions with hypodivergent, normodivergent, and hyperdivergent facial vertical patterns using cone-beam CT. Methods The descriptive, cross-sectional study evaluated 123 cephalogram from CBCT(CCB) of patients in Department of Orthodontics, the Affiliated Hospital of Qingdao University. According to cephalometric analysis, 89 Chinese adult class Ⅱ patients were divided into three groups according to the angle between FH-MP and the angle between SN-MP. In comparison, 34 Class Ⅰ normodivergent malocclusions individuals were selected as the control group. Comparing the cephalometric result between 4 groups. Results As expected, the hyperdivergent group had steeper anterior occlusal planes(14.73±3.76) ° and posterior occlusal planes(21.42±5.77)°, there was a significant statistical difference between the hyperdivergent group and other 2 groups in class Ⅱ patients(P<0.05). The height of maxillary second molar increased from high angle group to low angle group(P<0.01). Conclusion There are different characters of the occlusal planes in varied vertical facial pattern. The inclinations of anterior and posterior occlusal planes in Chinese class Ⅱ hyperdivergent group were steeper than other 3 groups. The difference of posterior occlusal plane inclination is mainly caused by the height of maxillary second molar.更多还原