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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (1): 62-68. doi: 10.19723/j.issn.1671-167X.2021.01.010

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Application of biocopy function of temporary crown occlusal morphology in patients with severe attrition

LI Zheng1,LIU Yu-shu1,2,WANG Shi-min3,ZHANG Rui1,JIA Lu3,YE Hong-qiang1,HU Wen-jie4,ZHAO Wen-yan5,LIU Yun-song1,Δ(),ZHOU Yong-sheng1   

  1. 1. Department of Prosthodontics, Peking University School and Hospital 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
    2. 2nd Dental Center, Peking University School and Hospital 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
    3. Digital Laboratory, Peking University School and Hospital 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
    4. Department of Periodontics, Peking University School and Hospital 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
    5. Department of Implantation, Yinchuan Stomatology Hospital, Yinchuan 75002, China
  • Received:2020-10-09 Online:2021-02-18 Published:2021-02-07
  • Contact: Yun-song LIU E-mail:liuyunsong@hsc.pku.edu.cn
  • Supported by:
    New Clinical Technology of Peking University of Stomatology(PKUSSNCT-19G01);Grant of the Key Research and Development Program of Ningxia Hui Autonomous Region(2018BEG02012)

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Abstract:

Objective: To explore the preliminary application of “biocopy function” in digital technology of temporary crown in severe tooth attrition, so as to reduce the difficulty of final restoration adjustment in severe tooth wear cases, and save clinical time.Methods: Twelve patients aged between 40 and 65 years with severe tooth attrition were recruited in this study. The experimental group (6 cases, 3 females and 3 males) used the method of digital copy of temporary restoration shape when making the final restoration, and the control group (6 cases, 3 females and 3 males) used the traditional method to make the final restoration. The mean time of central occlusal adjustment and protrusive and lateral occlusal adjustment of each crown, the number of follow-up visits of the patients were recorded and statistically analyzed. The occlusal comfort of the first and the third months after wearing the prosthesis was evaluated by the patients, and the difference of the occlusal comfort of the final prosthesis made by the two methods was compared (the full score was 10 points). The occlusal adjustment time and occlusal comfort score were used as measurement data. Single sample t test was used. The number of follow-up visits was count data. Rank sum test was used for non-normal continuous variables.Results: The mean occlusal time of each crown adjustment in the experimental group was significantly lower than that in the control group (P<0.01), and the median number of follow-up visits in the experimental group was lower than that in the control group (P<0.01). The average occlusal comfort score of the experimental group was higher than that of the control group at the first time (P<0.01). After three months of crown wearing, the median occlusal comfort score of the experimental group was higher than that of the control group (P<0.05).Conclusion: In the case of severe tooth attrition, it is feasible to use the “biocopy function” in the design software to design the final prosthesis, which is conducive to reduce the difficulty of adjustment and achieve predictable functional and aesthetic effects, which is of great significance to save clinical time and improve the accuracy of restoration.

Key words: Digital technology, Computer-aided design, Biocopy, Tooth attrition

CLC Number: 

  • R783.4

Figure 1

Facial and oral appearance at first visit A, facial appearance; B, occlusal photograph of maxillary dentition; C, occlusal photograph of mandibular dentition; D, front view of oral appearance."

Figure 2

Radiographic data A, X-ray; B, panoramic radiographs."

Figure 3

Occlusal splint and mock-up A, occlusal splint; B, mock-up."

Figure 4

Temporary crown A, the occlusal photograph of maxillary dentition; B, the occlusal photograph of mandibular dentition."

Figure 5

The final prosthesis was designed and made by replication method A, gilbach articulator; B, virtual articulator; C, the digital model of maxillary teeth after preparation; D, the digital model of maxillary temporary crown; E, the digital model of mandibular teeth after preparation; F, the digital model of mandibular temporary crown; G, the temporary crown and abutment tooth preparation were fitted and registered; H, the shape of temporary crown was reproduced by biocopy function; I, fine occlusal adjustment of maxillary dentition in virtual articulator; J, fine occlusal adjustment of mandibular dentition in virtual articulator; K, final restorations of maxillary teeth; L, final restorations of mandibular teeth."

Figure 6

Final restorations A, facial appearance; B, the front view of oral appearance; C, the right view of oral appearance; D, the left view of oral appearance."

Figure 7

One-year review A, the right view of oral appearance; B, the front view of oral appearance; C, the left view of oral appearance."

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