摘要
目的采用软件配准的方法建立三维整合牙颌模型，在此模型上进行虚拟排牙和舌侧矫治器设计，以期实现治疗后良好的牙冠牙根排列，为避免正畸治疗后并发症奠定研究基础。方法选择10例错拾患者进行头颅锥形束CT扫描、牙列石膏模型激光扫描，分别获取三维模型，采用软件配准的方法将两种数字化模型重叠，切除锥形束CT模型牙冠部分，获得三维整合牙颌模型。运用软件自动测量配准误差，采用随机区组设计的方差分析评价3名操作者间差异。对三维整合牙颌模型进行包括牙根的数字化排牙，在排牙模型上进行个性化舌侧托槽计算机辅助设计。结果3名操作者对上颌或下颌模型配准误差的差异均无统计学意义（P〉0．05）；上下颌配准误差分别是（0．144±0．020）和（0．141±0．022）mm；完成上下颌个性化舌侧托槽计算机辅助设计。结论通过软件配准方法可建立高精度三维整合牙颌模型，并可在虚拟矫治中获得良好牙冠牙根排列，以此为基础可完成个性化舌侧托槽的计算机辅助设计。
Objective To create an integrated digital maxillodental model and to apply it in computer aided design （ CAD ） of individualized lingual brackets in order to align both crowns and roots without fenestration and dehiscence. Methods Cone-beam computerized tomography （CBCT）-based maxillodental model and laser-scanned dental model were integrated by auto registration in 10 patients with malocclusions. The registration error was calculated automatically. Three observers tested the method independently. The inter-observer difference was investigated. An integrated model was selected randomly and the setup was created with roots and jaws in good relationship without fenestration and dehiscence. The individualized lingual brackets were designed by CAD on the setup. Results No significant difference was found in inter observers （ P 〉 0. 05 ） . The registration errors of maxilla and mandible were （ 0. 144 ± 0. 020 ） mm and （0. 141 ± 0. 022 ）mm, respectively. The digital individualized lingual brackets based on the virtual treatment in integrated digital maxillodental model were produced. Conclusions An integrated digital maxillodental model was created in good accuracy. By applying the integrated model, individualized lingual brackets were designed.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2012年第8期501-504,共4页
Chinese Journal of Stomatology
基金
北京市自然科学基金（4112023）
关键词
计算机辅助设计
正畸托架
锥形束CT
Computer-aided design
Orthodontic brackets
Cone-beam computed tomography
