不同氟斑牙程度及临床处理方法对正畸托槽脱落率的影响研究

摘要

Objective To investigate the effects of different enamel treatments on losing ratio of orthodontic brackets bonding to different degree of dental fluorosis. Methods A total of 30 patients with fluorosis were selected.They were divided into mild,moderate and severe degree groups according to Dean's criteria.Patients within each group were randomly assigned to 2 subgroup. Different methods including bonding after extending the etching time and bonding after microabrasion and normal acid etching were used respectively in the 2 subgroups of each group.The losing ratio of brackets was observed.The main effect and interaction effect of the degree of fluorosis and enamel treatments on losing ratio were analyzed. Results There was significant difference in the losing ratio between severe dental fluorosis and mild,moderate dental fluorosis in both treatments.The losing ratio of severe dental fluorosis was higher.There was no significant difference in the losing ratio between two treatments in the condition of mild dental fluorosis.There was significant difference in the losing ratio between two treatments in the condition of moderate and severe dental fluorosis.The method of bonding after microabrasion and normal acid etching was superior to the method of bonding after extending the etching time in the condition of moderate and severe dental fluorosis. Conclusion The main effect and interaction effect of the degree of fluorosis and enamel treatments on losing ratio are significant.The specific degree of dental fluorosis should be considered during the course of selecting appropriate treatment methods.%目的:探讨不同氟斑牙程度及处理方法对临床正畸托槽脱落率的影响.方法:选择需进行正畸治疗的氟斑牙患者共30例,按Dean氏法分为轻度、中度、重度3个组,各组内随机分为2个分组,分别采用延长酸蚀时间后粘结和磨除后常规酸蚀粘结的临床操作方法.观察托槽脱落率,并分析氟斑程度和处理方法这两个因素对脱落率影响的主体效应和交互效应.结果:不论采用何种方式,重度氟斑牙脱落率与轻、中度氟斑牙脱落率比较,具有显著差异(P<0.01),重度氟斑牙托槽脱落率较高.轻度氟斑牙条件下,两种处理方法脱落率不存在统计学差异(P>0.05);中、重度氟斑牙条件下,两种处理方法脱落率比较,存在显著差异(P<0.01),磨除后酸蚀法优于延长酸蚀时间法.结论:氟斑程度和处理方法这两个因素对脱落率影响的主体效应和交互效应显著,在临床矫治过程中应结合氟斑程度选择具体的处理方法.