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目的比较分析Hawley保持器和透明压膜保持器的正畸治疗保持效果。方法从2006年1月至2007年6月在湖北省襄阳市口腔医院正畸科采用直弓丝矫治器治疗矫治完成的各种错畸形病例中选择60例,按双盲法随机分成2组,30例应用Hawley保持器,30例应用透明压膜保持器进行保持,保持器均佩戴2年。在模型上测量保持前、后的PAR指数的7项指标(牙齿排列、覆盖、覆、中线、颊舌向关系、近远中关系、垂直向关系),评价复发情况。结果戴用保持器2年前后的指标变化均为透明压膜保持器组小于Hawley保持器组,但只有牙齿排列、覆、颊舌向关系方面差异有统计学意义,其余各项指标变化比较差异无统计学意义。结论在直丝弓矫治器治疗术后戴用保持器2年,透明压膜保持器与Hawley保持器相比在牙齿排列、覆、颊舌向关系方面有更加稳定的保持效果。
Objective To compare and analyze the effect of orthodontic treatment on Hawley retainer and transparent retainer. Methods From January 2006 to June 2007, 60 cases of various malformation deformities were treated by straight arch wire orthodontics in Xiangyang Stomatological Hospital of Hubei Province. Sixty cases were randomly divided into two groups , 30 cases using the Hawley holder, 30 cases with a transparent lamination holder to maintain the holder were worn for 2 years. Seven indicators of PAR index (tooth alignment, coverage, coverage, midline, bucco-lingual, relationship, near-mid- relationship, and vertical ) were measured on the model and the relapse was evaluated. Results The change of index of wearing cage after 2 years was less than that of the Hawley cage in the transparent lamination cage, but there was only significant difference in the relationship between the teeth arrangement, cristae and buccolingual tongue, and the rest of the indexes The difference was not statistically significant. Conclusions The use of a cage for 2 years after a straight wire appliance has been treated with a transparent stent holder shows a more stable retention of the tooth alignment, dorsal rapamia and buccolingual tongue relative to the Hawley cage.