关键词: 自锁托槽, 传统托槽, 牙列拥挤

Abstract:

Objective    To compare effects of the treatment for moderate to severe dental crowding with self-ligating bracket and conventional treatment system. Methods    Thirty patients with moderate to severe dental crowding were divided into two groups randomly. Patients of self-ligating group were treated with Clippy self-ligating bracket system of non-extraction；patients of conventional group were treated with OPA-K conventional straight wire bracket system of extraction. Compare the overall course of treatment，the cephalometric analysis，the analysis of model and the questionnaire survey results. Results    The overall course of treatment of self-ligating group was significantly shorter than the conventional group. U1-SN and L1-MP after the self-ligating treatment was significantly higher than the normal value. U1-SN with the conventional group was significantly lower than the normal value.  SNA and SNB after the conventional treatment were significantly decreased compared with the normal value. The increment of middle and posterior dental arch width and the increment of the full arch length of maxillary and mandibular were significantly higher after the self-ligating treatment compared with the conventional treatment. One week after treatment the pain questionnaire score of self-ligating group was significantly lower than conventional group. Conclusion    The Clippy self-ligating system is better than the OPA-K straight wire system in the treatment for moderate to severe dental crowding .

Key words: self-ligating bracket；conventional bracket；dental crowding