安氏Ⅱ类下颌后缩畸形患者颞颌关节窝位置变化的研究

摘要

Objective: To assess the position of the glenoid fossa in subjects with Class Ⅱ malocclusion associated with mandibular retrusion and normal mandibular size in the mixed dentition.Materials and Method: A sample of 31 subjects (16 male, 14 female), age (12.3±0.5)years, with skeletal and dental Class Ⅱ malocclusion associated with mandibular retrusion, normal skeletal vertical relationships, and normal mandibular dimensions,was compared with a matched group of 38 subjects (17 male, 21 female),age (11.7±0.7)years with skeletal and dental Class Ⅰ relationships.The comparisons between the Class Ⅱ group and the control group on the cephalometric measures for the assessment of g]enoid fossa position were performed by means of a nonparametric test for independent samples (Mann-Whitney U-test,P ＜0.05).Result: Subjects with Class Ⅱ malocclusion presented with a significantly more distal position of the glenoid fossa,when compared with the control group as measured by means of three parameters (GF-S on FH, GF-Ptm on FH, and GF-FMN).Conclusion: A posteriorly displaced glenoid fossa is a possible diagnostic feature of Class Ⅱ malocclusion associated with mandibular retrusion.An effective cephalometric measurement to evaluate glenoid fossa position is the distance from the glenoid fossa to the frontomaxillonasal suture (GF-FMN).%目的:研究恒牙初期安氏Ⅱ类下颌后缩畸形患者颞颌关节窝位置的变化.方法:实验组为31例安氏Ⅱ类下颌后缩畸形恒牙列初期病例,男13例,女18例,年龄12.3±0.5岁,对照组为38例安氏Ⅰ类错(牙合)恒牙列初期病例,男17例,女21例,年龄11.7±0.7岁.在X线头颅定位侧位片上进行头影测量,比较关节窝的位置变化.结果用独立样本t检验.结果:同对照组安氏Ⅰ类错(牙合)相比.安氏Ⅱ类错(牙合)患者的关节窝位置更偏远中(GF-S on FH,GF-Ptm on FH,GF-FMN)(P<0.05).结论:下颌后缩时,关节窝可能后移,评估关节窝位置的最佳测量指标是关节窝到前鼻嵴点间的距离(GF-FMN).