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北京大学学报（医学版） ›› 2022, Vol. 54 ›› Issue (1): 193-199. doi: 10.19723/j.issn.1671-167X.2022.01.031

• 技术方法 • 上一篇    

姿势微笑位口唇对称参考平面的数字化构建及初步应用验证

邱淑婷1,朱玉佳1,2,王时敏3,王飞龙1,叶红强1,赵一姣1,2,△(),刘云松1,△(),王勇1,2,周永胜1   

  1. 1.北京大学口腔医学院·口腔医院 修复科,北京 100081
    2.北京大学口腔医学院·口腔医院 口腔医学数字化研究中心,北京 100081
    3.北京大学口腔医学院·口腔医院 义齿加工中心,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔数字化医疗技术和材料国家工程实验室,口腔数字医学北京市重点实验室,北京 100081
  • 收稿日期:2021-10-08 出版日期:2022-02-18 发布日期:2022-02-21
  • 通讯作者: 赵一姣,刘云松 E-mail:kqcadcs@bjmu.edu.cn;liuyunsong@hsc.pku.edu.cn
  • 基金资助:
    国家重大疾病多学科合作诊疗能力建设项目(PKUSSNMP-202004);国家自然科学基金(82071171);兰州市创新人才项目(2019-RC-22)

Preliminary clinical application verification of complete digital workflow of design lips symmetry reference plane based on posed smile

QIU Shu-ting1,ZHU Yu-jia1,2,WANG Shi-min3,WANG Fei-long1,YE Hong-qiang1,ZHAO Yi-jiao1,2,△(),LIU Yun-song1,△(),WANG Yong1,2,ZHOU Yong-sheng1   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
    2. Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China
    3. Center of Dental Laboratory, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2021-10-08 Online:2022-02-18 Published:2022-02-21
  • Contact: Yi-jiao ZHAO,Yun-song LIU E-mail:kqcadcs@bjmu.edu.cn;liuyunsong@hsc.pku.edu.cn
  • Supported by:
    National Program for Multidisciplinary Cooperative Treatment on Major Diseases(PKUSSNMP-202004);National Natural Science Foundation of China(82071171);Lanzhou Innovative Talents Foundation(2019-RC-22)

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摘要：

目的: 探索数字化技术构建姿势微笑(posed smile)位口唇对称参考平面(symmetry reference plane, SRP)的方法,实现姿势微笑位口唇SRP的自动化构建,并评价其初步应用效果。方法: 收集18名研究对象的三维面部和牙列数据,基于赋权普氏分析(weighted Procrustes analysis,WPA)算法和区域迭代最近点(iterative closest point,ICP)算法,分别构建每位受试者WPA算法和初学者ICP算法的姿势微笑位口唇SRP作为实验组,以专家定义的“真值平面(truth plane,TP)”作为对照组,比较WPA算法和初学者ICP算法确定的SRP与TP间的角度差异。将姿势微笑位下WPA算法自动获得的口唇SRP应用于前牙美学修复的数字化设计,进行临床初步应用评价。结果: 18名受试者姿势微笑位下WPA算法建立的口唇SRP与TP角度差异为1.78°±1.24°,初学者ICP算法建立的口唇SRP与TP角度差异为7.41°±4.31°,二者差异有统计学意义(P<0.05)。在前牙美学设计时,参照姿势微笑位下WPA算法自动获得的口唇SRP进行前牙修复体美学设计,受试者评分为(8.48±0.57)分;常规数字化方案按照原有牙列对称平面进行修复体设计,受试者评分为(5.20±1.31)分,二者差异有统计学意义(P<0.01)。结论: WPA算法自动构建的姿势微笑位口唇SRP较初学者ICP算法更准确,与“真值平面”非常相近,可以为口腔美学分析和设计提供重要参考,参照WPA算法自动构建的口唇SRP进行前牙修复体设计,能有效促进医患交流,提高患者对修复效果的满意度。

关键词: 牙科美学, 面部不对称, 成像, 三维, 计算机辅助设计

Abstract:

Objective: To automatically construct lips symmetry reference plane (SRP) based on posed smile, and to evaluate its advantages over conventional digital aesthetic design. Methods: Eighteen subjects’ three-dimensional facial and dentition data were gathered in this study. The lips SRP of experimental groups were used with the standard weighted Procrustes analysis (WPA) algorithm and iterative closest point (ICP), respectively. A reference plane defined by experts based on regional ICP algorithm, served as the truth plane. The angle error values between the lips SRP of WPA algorithm in the experimental groups and the truth plane were evaluated in this study, and the lips SRP of ICP algorithm of the experimental groups was calculated in the same way. The lips SRP based on posed smile as a reference for aesthetic design and evaluate preliminary clinical application. Results: The average angle error between the lips SRP of WPA algorithm and the truth plane was 1.78°±1.24°, which was smaller than that between the lips SRP of ICP and the truth plane 7.41°±4.31°. There were significant differences in the angle errors among the groups (P<0.05). In the aesthetic design of anterior teeth, automatically constructing the lips SRP of WPA algorithm based on posed smile and the original symmetry plane by re-ference compared with the prosthetic design, the subjects’ scores on the lips SRP of WPA algorithm based on posed smile (8.48±0.57) were higher than those on the original symmetry plane (5.20±1.31). Conclusion: Automatically constructing the lips SRP of WPA algorithm based on posed smile was more accurate than ICP algorithm, which was consistent with the truth plane. Moreover, it can provide an important reference for oral aesthetic diagnosis and aesthetic analysis of the restoration effect. In the aesthetic design of anterior teeth, automatically constructing the lips SRP of WPA algorithm based on posed smile can improve the patients’ satisfaction in esthetic rehabilitation.

Key words: Dental esthetics, Facial asymmetry, Imaging, three-dimensional, Computer-aided design

中图分类号: 

  • R783

图1

姿势微笑位三维面部数据获取过程"

图2

数字化三维牙列模型"

图3

8个解剖标志点示意图"

图4

一例受试者由WPA算法、ICP算法构建的口唇对称参考平面及其真值平面"

图5

数字化美学修复体的设计"

表1

WPA算法和ICP算法构建SRP的平面角度误差"

Subject Angle error/(°) Subject Angle error/(°)
WPA ICP WPA ICP
1 2.42 10.50 10 0.86 14.16
2 3.58 6.13 11 1.93 6.82
3 4.56 8.80 12 3.21 12.52
4 1.09 7.37 13 0.16 2.15
5 0.59 2.27 14 0.06 0.43
6 1.82 6.80 15 0.78 3.15
7 0.98 17.12 16 1.25 6.58
8 3.12 7.26 17 2.16 9.70
9 1.06 4.39 18 2.39 7.24

图6

WPA算法和ICP算法确定SRP平均角度差异"

图7

参考WPA算法和OSP设计修复体平均分"

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ISSN 1671-167X
CN 11-4691/R
主管单位：中华人民共和国教育部
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