摘要
Abstract
Objective To evaluate the clinical effects of the self- ligating bracket system. As a clinical reference for choosing bracket system efficiently and reasonablely. Methods Twelve patients diagnosed as class II division 2 were selected in the study.They all received non- extraction treatment.The patients were assigned to 2 groups:group 1 received non- extraction treatment with a self- ligating bracket and the other group with a conventional bracket.They were combined with occlusal guide to open bit.Lateral cephalometric radiographs and dental casts obtained at the beginning and the end of treatment were used to assess the alteration in hard tissue,and measurements of width and arch length of dentition were made on dental casts to investigate changes associated with the correction.Paired t- tests and group t- tests were used instatistical analysis. Results There was significant increase in length and widths of dental arch with self- ligating and conventional bracket after treatment,there was no significant differences between self- ligatiing and conventional group ( P>0.05);both group were enlarged in widths of the Basal Bone arch after treatment,there was significant differences between self- ligatiing and conventional group ( P<0.05);both groups were no enlarged in length of the maxillary Basal Bone arch after treatment, but they were enlarged in the mandibular Basal Bone arch , also there was significant increase in U1- SNoand L1- MPoin both groups,but there were no significant difference between self- ligating and conventional bracket groups;there was significant change in treat time between two groups, self- ligating groups were less. Conclusion Self- ligating bracket system can cause the proclination of the incisors and increase the arch and Basal Bone width to some degree,It is good to unlock from three dimensional Direction.Self- ligating bracket was better than conventional bracket for increase Basal Bone width.It can prevents the bracket off and open bit quickly combined with occlusal guide,and Shortening the treatment time.Particularly suited for angle class II division 2 malocclusion.关键词
自锁托槽/传统直丝弓托槽/头影测量/牙弓宽度/基骨弓宽度/平面导板Key words
self- ligating brackets/conventional bracket/cephalometric/dental arch width/basal Bone arch width/occlusal guide分类
医药卫生
