上颌埋伏中切牙正畸治疗前、后体积和表面积变化的锥形束CT分析

doi:10.19439/j.sjos.2017.01.016

摘要/Abstract

摘要： 目的采用锥形束CT（CBCT）研究埋伏上颌中切牙正畸治疗前、后体积和表面积变化,探讨牙根吸收情况。方法对10例上颌埋伏中切牙患者（12颗埋伏牙,8颗对侧同名牙）,采用外科开窗、导杆式矫治器牵引、直丝弓技术治疗,治疗前、后拍摄CBCT。Mimics软件三维重建,分离上颌埋伏中切牙及对侧同名牙,其中8例单侧埋伏阻生患者的对侧同名牙作为对照组。计算牙体积和表面积,采用SPSS13.0软件包中的配对t检验对治疗前、后体积、表面积变化进行统计学分析。结果埋伏牙治疗前后牙体积平均增加（9.67±10.86）mm³,表面积平均增加（28.97±14.36）mm²,均有显著差异（P<0.05）。对照组对侧同名牙治疗后牙体积平均增加（12.38±10.22）mm³,表面积平均增加（30.64±16.74）mm²。埋伏牙组与对照组治疗前、后体积及表面积增加量无显著差异（P均>0.05）。结论对尚未完全发育完成的埋伏上颌中切牙,正畸结合外科治疗能促进牙根发育,不会引起牙根吸收,是一种安全的治疗方法。

关键词: 上颌埋伏中切牙, 体积, 表面积, 锥形束CT

Abstract: PURPOSE: The purpose of this study was to quantitatively evaluate root resorption by cone-beam computer tomography (CBCT) after orthodontic treatment of impacted upper central incisors. METHODS: Ten patients (12 impacted incisors and 8 contralateral corresponding teeth) were included in this study. With self-designed modified nance arch and straight wire arch, the impacted incisors were treated by combined orthodontics and surgery approach. CBCT images of all patients were taken before and immediately after the treatment. Mimics software was used to build three-dimensional images. The upper central incisors were isolated. Volumes of teeth and superficial area were calculated. The difference between pre- and post- treatment was statistically evaluated with paired samples t test using SPSS13.0 software package. RESULTS: Significant difference in volume and superficial area was found between pre- and post- treatment (P<0.05). The average whole dental volume increase was (9.67±10.86) mm³, and the superficial area increase was (28.97±14.36)mm². Statistical significance was achieved among 12 impacted incisors. The average whole dental volume increase of the control group was（12.38±10.22）mm³, and the superficial area increase was（30.64±16.74）mm². There was no significant difference between the impacted and the control group in dental volume and superficial area before and after treatment (P>0.05). CONCLUSIONS: The treatment by combined orthodontics and surgery approach could promote tooth development for impacted incisors without causing root absorption, which can be safely performed.

中图分类号:

R782.1

林燕, 江银华, 陶海彪, 孙浩, 胡荣党. 上颌埋伏中切牙正畸治疗前、后体积和表面积变化的锥形束CT分析[J]. 上海口腔医学, 2017, 26(1): 76-79.

LIN Yan, JIANG Yin-hua, TAO Hai-biao, SUN Hao, HU Rong-dang. Cone-beam CT evaluation of volume and surface area changes of impacted upper central incisors before and after orthodontic treatment[J]. Shanghai Journal of Stomatology, 2017, 26(1): 76-79.

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