【摘要】 目的探讨影响Damon系统非拔牙矫治中度牙列拥挤患者临床疗效的相关因素。方法选择采用Damon Q自锁托槽非拔牙矫治的中度拥挤患者40例,对患者矫治前后头颅侧位片14项硬组织及9项软组织指标进行头影测量,根据治疗前(T1)和治疗后(T2)软组织Z角分为治疗成功组和失败组,使用SPSS 19.0软件对治疗前后两组各项指标进行配对样本t检验和独立样本t检验,分析比较两组患者治疗前后软硬组织变化特征。结果 40例患者中治疗成功22例,失败18例,两组间性别、年龄分布无差异。两组患者L1-AP角在治疗后均显著变大,FMIA角变小;失败组患者下唇至E线距离在治疗后显著增加,Z角显著减小。失败组患者L1-NB距、下颌平面角、上下唇至E线距离以及软硬组织面角在T1和T2时均显著大于成功组。不同垂直骨面型患者在成功组与失败组间分布存在差异,低角病例具有更好的治疗效果。结论直立的下前牙、理想的上下唇突度和较低的垂直骨面型是Damon系统非拔牙矫治中度牙列拥挤成功的有利前提。更多还原

【Abstract】 Objective To investigate the related factors that influence the clinical efficacy of non-extraction treatment of moderate crowding with Damon self-ligating system. Methods Forty cases with moderate crowding were selected and all of them were treated with Damon Q self-ligating appliances. Fourteen hard-tissue and nine soft-tissue measurements from cephalometric radiophotographs were analyzed before and after crowding correction. According to chin lip Z angle, all cases were divided into two groups(success group and failure group). All the indexes were analyzed with paired-samples t test and independent-samples t test before and after treatment using SPSS 19.0 software. The change characteristics of soft and hard tissues were also compared between the two groups. Results Of 40 cases, 22 cases were included in success group, 18 cases were allotted in failure group. There was no significant difference in gender and age distributions between two groups. L1-AP angle significantly increased after treatment in two groups, while FMIA significantly decreased. Lower lip to E line distance significantly increased while Z angle significantly decreased in failure group after treatment. L1-NB distance, mandibular plane angle(FMA), lower/upper lip to E line distance, as well as soft/hard tissue facial angle in failure group were all significantly larger than those in success group in both T1 and T2. The distribution of individuals with low angle, average angle and high angle was significantly different between two groups and the low angle cases achieved better therapeutic effects. Conclusion The upright lower incisor, ideal lip protrusions and lower mandibular plane angle are favorable prerequisites for the successful non-extraction treatment of moderate crowding with Damon self-ligating system.更多还原