虚拟排牙的牙根外露检验性研究  

Exposure of the root in virtual treatment on laser-scanned dental model

作　　者：郭宏铭[1] 张晓娟[1] 赵勇[2] 白玉兴[1] 厉松[1] 

机构地区：[1]首都医科大学口腔医学院正畸科,北京100050 [2]上海时代天使生物科技有限公司医学部

出　　处：《北京口腔医学》2013年第3期156-158,共3页Beijing Journal of Stomatology

基　　金：北京市自然科学基金(4112020);首都医科大学基础-临床合作基金(11JL10)

摘　　要：目的检验以三维牙冠模型为基础虚拟排牙,当上下颌牙冠在虚拟矫治达到良好排列和咬合时,有无牙根外露情况以及好发位置。方法选择15例成人骨型Ⅰ类拔牙矫治病例作为研究样本,以其牙列石膏模型的激光扫描三维数字化模型为基础进行虚拟排牙,使上下颌牙冠达到良好排列和咬合。同时所有研究样本进行头颅CBCT扫描,采用软件配准的方法获得激光扫描模型和CBCT扫描模型的3D整合牙颌模型,将3D整合牙颌模型的牙冠移动到虚拟排牙后的位置,使3D整合牙颌模型的牙冠与虚拟排牙的牙冠完全一致,此时显示随牙冠一起移动的牙根,观察牙根是否移动到颌骨的骨皮质外。结果所有样本在虚拟排牙模型中,至少有一处牙根外露,出现牙根外露的比例为100%,其中出现牙根外露比例较高位置依次为上颌尖牙、上下颌切牙和第一磨牙处。结论以数字化牙冠模型为基础的虚拟排牙,当上下颌牙冠在计算机排牙中达到良好排列和咬合时,并不能完全避免牙根外露于骨皮质外。Objective To investigate whether virtual setup on laser-scanned dental model will result in exposure of the root. Methods Cone beam computerized tomography （CBCT） and laser scanning data were collected from 15 adult individuals with skeletal Class I malocclusion. The virtual setup was performed on the laser-scanned dental models. CBCT based maxillodental model was input into setup model to observe whether virtual treatment would cause exposure of the root and to define the vulnerable sites of dehiscence and fenestration. Results Exposure of the root was found at least at one site in all subjects in setup models of virtual treatment based on laser-scanned dental model. The vulnerable sites of dehiscence and fenestration were maxillary canine, maxillary and mandibular incisors, maxillary and mandibular first molars. Conclusion The virtual treatment based only on laser-scanned dental model cannot absolutely ensure the good alignment of roots without dehiscence and fenestration.

关 键 词：虚拟排牙 激光扫描三维数字化模型 CBCT 牙根外露 

分 类 号：R783.5[医药卫生—口腔医学]