自锁矫治与传统矫治对牙根吸收的影响

目的:探讨自锁托槽轻力矫治是否可以减轻对牙根的吸收。方法:选取临床治疗的安氏Ⅰ、Ⅱ类拥挤并拔除4颗第一前磨牙病例30例,分为2组。其中,15例使用Damon 3MX自锁托槽矫治(自锁组),15例使用传统结扎式直丝托槽矫治(结扎组)。2组资料矫治前在性别、年龄、拥挤度及错类型等指标上具有可比性。通过矫治前、后的模型及全口曲面体层片,测量计算2组矫治后上、下切牙牙根吸收量,应用SPSS19.0软件包对数据进行t检验分析。结果:①上颌中切牙牙根吸收自锁组为(2.05±1.51)mm,结扎组为(2.08±1.21)mm,差异无显著性(P=0.973>0.05)。②上颌侧切牙牙根吸收自锁组为(1.77±1.01)mm,结扎组为(1.91±1.59)mm,差异无显著性(P=0.848>0.05)。③下颌中切牙牙根吸收自锁组为(2.06±1.62)mm,结扎组为(1.98±1.50)mm,差异无显著性(P=0.926>0.05)。④下颌侧切牙牙根吸收自锁组为(1.94±1.45)mm,结扎组为(1.84±1.17)mm,差异无显著性(P=0.888>0.05)。结论:在拔牙正畸中,自锁矫治并未表现出比传统结扎矫治更少的牙根吸收。

Comparative study on the apical root resorption between self-ligating and conventional brackets in extraction patients

PURPOSE: To explore whether orthodontic light force with self-ligating brackets can reduce the amount of external apical root resorption(EARR).METHODS: Thirty patients with ClassⅠor Ⅱ crowding malocclusion were selected.Four first premolars of all patients were extracted in orthodontic treatment.15 patients were treated with self-ligating brackets(Damon 3MX) and 15 patients with conventional ligation brackets,respectively.Patients in two groups were comparable in gender,age,crowded degree and malocclusion classification at the commencement of treatment.EARR of the maxillary and mandible incisors was evaluated on panoramic radiographs and models taken before and after treatment,and measured in millimeters.Student’s t test was performed using SPSS19.0 software package.RESULTS: Overall,no difference was found in the amount of EARR between the two groups.The amount of EARR in maxillary central incisor was(2.05±1.51) mm in Damon group and(2.08±1.21) mm in conventional group(P=0.973>0.05);(1.77±1.01) mm in maxillary lateral incisor in Damon group and(1.91±1.59) mm in conventional group(P=0.848>0.05);(2.06±1.62) mm in mandibular central incisor in Damon group and(1.98±1.50) mm in conventional group(P=0.926>0.05);(1.94±1.45) mm in mandibular lateral incisor in Damon group and(1.84±1.17) mm in conventional group(P=0.888>0.05).CONCLUSION: No difference should be expected for root resorption between self-ligating and conventional brackets in orthodontic extraction treatment.