【摘要】 目的:探讨正畸模拟拔除前磨牙对Bolton指数全牙比的影响。方法:随机选择198例不同类型错畸形患者的记存模型,分别计算拔牙前和模拟4种模式拔牙后的Bolton指数全牙比。采用SPSS17.0软件包对数据进行统计学分析。结果:拔牙后的Bolton指数全牙比均有变小趋势,其中拔5/5、5/4模式降低更明显,与拔4/4、4/5模式相比有显著差异(P<0.01),但不同错类别间无显著差异(P>0.05)。结论:正畸医师在制订治疗方案时,应考虑到拔牙矫治会降低Bolton指数全牙比。更多还原

【Abstract】 PURPOSE:To investigate the effect of premolar extraction on Bolton index overall ratios. METHODS:Bolton index overall ratios were measured in 198 randomly chosen dental casts of three types of Angle’s malocclusions before and after 4 combinations of hypothetical premolar extractions. The data was processed using SPSS 17.0 software package.RESULTS:The overall ratios decreased in each class of Angle’s malocclusion after all combinations of premolars extraction, and the decreases in combinations of 5/5 and 5/4 extractions were significantly greater than that of 4/4 and 4/5combinations(P <0.05), but no significant difference was found between different types of malocclusion(P >0.05).CONCLUSIONS:When formulating a treatment plan involving premolar extractions, orthodontists should consider that the Bolton overall ratios may decrease.更多还原