华西口腔医学杂志

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前磨牙拔除模式对不同错牙合畸形Bolton指数全牙比的影响

雷巧玲 周力   

  1. 四川大学华西口腔医院正畸科, 成都610041
  • 收稿日期:2012-04-25 修回日期:2012-04-25 出版日期:2012-04-01 发布日期:2012-04-01
  • 通讯作者: 周力,Tel:028-85503040
  • 作者简介:雷巧玲(1986—),女,湖南人,住院医师,硕士

The effect of premolar extraction models on Bolton overall ratio among different classes of malocclusion

Lei Qiaoling, Zhou Li   

  1. Dept. of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2012-04-25 Revised:2012-04-25 Online:2012-04-01 Published:2012-04-01
  • Contact: Zhou Li,Tel:028-85503040
  • About author:Lei Qiaoling(1986—),女,湖南人,住院医师,硕士

摘要:

目的探讨前磨牙拔除模式对不同错牙合畸形Bolton指数全牙比的影响。方法选取180副牙性与骨性错牙合类型一致的患者模型,Ⅰ、Ⅱ、Ⅲ类每组60例,计算各组拔牙前和采用4种前磨牙拔除模式          拔牙后的Bolton指数全牙比,以87%~89%为拔牙后Bolton指数全牙比参考值,对各组4种拔牙模式下Bolton指数全牙比的
异常率进行卡方检验。结果3组完整牙列Bolton指数全牙比差异有统计学意义(P=0.000);Ⅰ、Ⅱ类组不同模式拔牙后Bolton指数全牙比异常率差异无统计学意义(P>0.05),Ⅲ类组不同模式拔牙后异常率差异有统计学意义,拔除     的异常率小于拔除     (P=0.002)。结论从牙量协调的角度考虑,Ⅰ、Ⅱ类错牙合畸形采用4种拔牙模式均可,Ⅲ类错牙合畸形拔除     的模式优于     。

关键词: 错牙合, 拔牙, 前磨牙, 正畸学, 牙测量学

Abstract:

Objective To investigate the effect of different premolar extraction models on postextraction Bolton overall ratio among different classes of malocclusion. Methods 180 patients with equivalent skeletal and dental classifications were chosen(Group Ⅰ, Ⅱ and Ⅲ, with 60 per group). According to dental casts, the Bolton overall ratios of each group were measured and compared before and after hypothetical premolar extraction(the four premolar extraction models were all first premolars, all second premolars, upper first and lower second premolars, and upper second and lower first premolars). Chi-square Test analysis was taken within each group in order to compare the abnormal rates of postextraction Bolton overall ratios. Results The differences of pretreatment Bolton overall ratios among three types of malocclusions were found statistically significant(P=0.000). For Class Ⅰ and Class Ⅱ group, the four extraction models made no statistically significant differences in the abnormal rates of postextraction Bolton overall ratio(P>0.05). For Class Ⅲ group, the four extraction models made statistically different results that was the upper second and lower first premolar extraction model creating lower abnormal rates than the upper first and lower second premolar extraction model(P=0.002). Conclusion As far as the postextraction Bolton overall ratios are concerned, Class Ⅰ and Ⅱ malocclusions can choose any of four premolar extraction models, while to Class Ⅲ malocclusions, the upper second and lower first premolar extraction model fits better than the upper first and lower second premolar extraction model.

Key words: malocclusion, tooth extraction, premolar, orthodontics, odontometry