两种自锁托槽对非拔牙病例牙弓变化影响的对比研究

Comparative study on the influence of two kinds of different self-locking brackets on the dental arch shape change in non-extraction patients

目的通过分析两种自锁托槽治疗非拔牙病例在排齐整平阶段后牙弓宽度、长度、周长变化,比较主动与被动自锁托槽对排齐整平后牙弓变化影响的差异性。方法牙弓周长增加量为因变量Y,矫治前后各牙弓测量值的变化(WU/L3、WU/L4、WU/L5、WU/L6、U/LL)为自变量进行分析。比较主动矫治器(主动组)与被动矫治器(被动组)矫治后牙弓变化情况。再将各项测量值的变化量进行t检验,比较两种不同矫治器矫治后牙弓各项测量值变化量有无统计学意义。结果两组矫治器相关与回归结果显示牙弓周长、牙弓宽度与长度增加量有相关性,回归方程检验均显示有统计学意义(P<0.05)。主动组与被动组各测量值比较显示WU3、WL3、WL6、LR 4项测量值有统计学意义(P<0.05)。结论主动组与被动组都有良好的扩弓效应。被动组在上下颌尖牙扩展优于主动组,而主动组在下颌第一磨牙与下牙弓周长的扩展优于被动组。

Objective By analyzing changes of dental arch width and length during the aligning and leveling period(non?extraction case)with two kinds of self?locking bracket,compare the difference between the active self?lockingbracket with the passive bracket.Methods The data of dental arch perimeter change amount and dental arch widthand length change amount(WU/L3,WU/L4,WU/L5,WU/L6,U/LL)were statistically analyzed using the correlation andregression method by comparing active and passive brackets for the correction of dental arch variations.Two differentbrackets for the correction of the measured values of the dental arch variations was analyzed by t?test.Results Therewere statistical relationships between the amount of arch perimeter increase and the amount of width and length in?crease.The regression equation was statistically significant(P<0.05),It was greater impacted arch width increase toarch perimeter in the self?locking.The t?test results showed WU3,WL3,WL6,LR4measured values(P<0.05)statisti?cally significant in the active self?locking group and passive group.Conclusion Active and passive self?locking brack?et have good arch expansion effecting.The active self?locking bracket is slightly dominant than the passive bracket inthe expansion of the canine width whereas the active self?locking bracket is better than the passive in the expansion of the mandibular first molar and arch perimeter which should be widely applied to the appropriate cases.