目的:研究了II类骨骼性II类错牙合的成年人的切缘引导角(IGA)和咬合平面角与颞下颌关节(TMJ)形态之间的相关性。
方法:对37例患者的CBCT图像进行分析。其中骨性II类II类低角度错牙合19例(研究组),骨性I类平均角度18例(对照组)。采用InvivoDental5软件采集切缘引导角(IGA)数据,咬合平面角度(FH-OP),前咬合平面角度(FH-AOP)和TMJ测量项目。
结果:IGA的结果,FH-AOP角和FH-OP角显示研究组>对照组(P<0.05)。髁突中外侧直径有统计学差异,关节隆起倾斜度和高度,两组之间的后关节间隙。髁前后径没有发现差异,髁倾角,髁头的宽度和高度,髁突长度,关节盂窝深度和宽度在两组之间。在研究小组中,IGA与FH-AOP呈中等相关性,与FH-OP和髁突中外侧直径弱相关。同时,FH-AOP之间存在相关性,FH-OP,和TMJ指标。
结论:IGA不仅与FH-AOP和FH-OP有关,而且是髁突中外侧直径。此外,在骨骼II类II类低角度错牙合中,咬合平面角度与TMJ形态之间存在相关性。
结论:对于骨骼II类II类低角度错牙合的患者,调整IGA和咬合平面角度可以改善前牙的美观,咬合功能,和TMJ形态学。
OBJECTIVE: The correlations between the incisal guidance angle (IGA) and occlusal plane angles and temporomandibular joint (TMJ) morphology were investigated in adults with skeletal Class II division II malocclusion.
METHODS: CBCT images of 37 patients were analyzed. It included 19 cases of skeletal Class II division II malocclusion with low angle (study group) and 18 cases of skeletal Class I average angle (control group). The Invivo Dental 5 software was employed to acquire the data of the incisal guidance angle (IGA), occlusal plane angle (FH-OP), anterior occlusal plane angle (FH-AOP) and the TMJ measurement items.
RESULTS: The results of IGA, FH-AOP angle and FH-OP angle showed the study group > the control group (P < 0.05). There were statistically difference in the condylar mediolateral diameters, articular eminence inclination and height, and posterior joint spaces between two groups. No differences were revealed in the condylar anteroposterior diameters, the condylar inclination angle, condylar head width and height, condylar length, glenoid fossa depth and width between two groups. In the study group, IGA showed a moderate correlation with FH-AOP, a weak correlation with FH-OP and condylar mediolateral diameters. Meanwhile, there was a correlation between FH-AOP, FH-OP, and TMJ indicators.
CONCLUSIONS: The IGA was not only related to FH-AOP and FH-OP, but also to the condylar mediolateral diameters. In addition, there was a correlation between the occlusal plane angles and TMJ morphology in skeletal Class II division II low angle malocclusion.
CONCLUSIONS: For patients with skeletal Class II division II low angle malocclusion, adjusting the IGA and the occlusal plane angles could improve the esthetic appearance of the anterior teeth, occlusal function, and TMJ morphology.