West China Journal of Stomatology ›› 2022, Vol. 40 ›› Issue (2): 123-133.doi: 10.7518/hxkq.2022.02.001

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Consensus on the preparation margin and restoration margin in ceramic esthetic rehabilitation

Yu Haiyang1(), Yue Li1, Liu Weicai2, Liu Feng3, Niu Lina4, Shao Longquan5, Liao Hongbing6, Luo Xiaoping7, Li Hongbo8, Jiang Qingsong9, Yu Hao10, Zhao Bin11, Wu Zhe12, Li Changyi13, Wu Guofeng7, Wang Yan14, Mou Yandong15, Liu Yunsong3, Zhang Haiyang16, Chen Jihua4, Liu Hongchen8   

  1. 1.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
    2.Hospital of Stomatology, Tongji University, Shanghai 200072, China
    3.School and Hospital of Stomatology, Peking University, Beijing 100081, China
    4.School of Stomatology, The Fourth Military Medical University, Xi, an 710032, China
    5.Nanfang Hospital, Southern Medical University, Guangzhou 510280, China
    6.College of Stomatology, Guangxi Medical University, Nanning 530013, China
    7.Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing 210008, China
    8.Research Institute of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
    9.Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing 100006, China
    10.School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
    11.Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030012, China
    12.Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou 510013, China
    13.Stomatological Hospital, Tianjin Medical University, Tianjin 300070, China
    14.Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou 510055, China
    15.Dept. of Stomatology, Sichuan Provincial People, s Hospital, University of Electronic Science and Technology of China, Chengdu 610072, China
    16.Hospital of Stomatology, Jilin University, Changchun 130021, China
  • Received:2021-12-01 Revised:2022-01-05 Online:2022-04-01 Published:2022-04-01
  • Contact: Yu Haiyang E-mail:yhyang6812@scu.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(82071145);The Research Fund of Inter-disciplinary Innovation Project from Sichuan University(RD-03-202009);Correspondence: Yu Haiyang, E-mail: yhyang6812@scu.edu.cn


In esthetic rehabilitation, methods used to enhance the margin quality have always been the focus and difficulty of improving the level of diagnosis and treatment, prevention and treatment of complications, and collaboration between clinicians and technicians. However, it is impeded by the ambiguous definition and classification of margin, unstandardized tooth preparation, manufacturing process of restoration, and lack of reliable means of checking the quantitative requirements of preparation or restoration. The digital technologies that are increasingly applied, such as intra-oral scanner, impression scanner, and computerized numerical control cutting machine, have strict requirements about margin quality. Failure of recognizing margins by these scanners will hinder the digital process of diagnosis and treatment. Even if these sharp and narrow margins are successfully scanned, they cannot be milled accurately. To overcome these problems, this article demonstrated the clear and complete definition of preparation margin and restoration margin, as well as their subclassifications, by analyzing the target restoration space from a geometric perspective. Practical approaches to measuring the margin width and inspecting the margin quality were proposed. The new and full understanding and proposal about preparation margin and restoration margin characterized by measurements will effectively support the thoroughly digitalized process of esthetic rehabilitation using porcelain in fixed prosthodontics, which is based on the guidance of values.

Key words: preparation margin, restoration margin, esthetic porcelain rehabilitation, digitalization, physical measurement, clinician-patient-technician collaboration

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