Chinese Journal of Tissue Engineering Research ›› 2019, Vol. 23 ›› Issue (6): 870-876.doi: 10.3969/j.issn.2095-4344.1557

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Different materials and different methods for repairing an isolated tooth defect model: a three-dimensional finite element analysis of stress distribution

Feng Guangzhi1, Fu Hongyu2, Ma Penghua3   

  1. 1Department of Stomatology, Beijing Haidian Hospital, Beijing 100080, China; 2Department of Stomatology, Peking University First Hospital, Beijing 100034, China; 3Dental Medical Center, China-Japan Friendship Hospital, Beijing 100029, China
  • Received:2018-10-24 Online:2019-02-28 Published:2019-02-28
  • Contact: Ma Penghua, Attending physician, Dental Medical Center, China-Japan Friendship Hospital, Beijing 100029, China
  • About author:Feng Guangzhi, Master, Attending physician, Department of Stomatology, Beijing Haidian Hospital, Beijing 100080, China
  • Supported by:

    the Youth Research Project of Beijing Haidian Hospital, No. KYQ2015008 (to FGZ)

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Abstract:

BACKGROUND: Current concerns are on how to maximize the reservation of tooth tissues after root canal treatment and to ensure the strength of the tooth after repair.

OBJECTIVE: To analyze the stress distribution of an isolated tooth defect model after repair with different methods
METHODS: We collected 12 maxillary first molars which had been extracted for chronic periodontitis at the Department of Stomatology, Beijing Haidian Hospital in China. After root canal treatment, the isolated tooth defect model was prepared and repaired with different materials (cobalt-chromium alloy, pure titanium metal, zirconium dioxide, E.max all-ceramic) and using different repair methods (inlay, onlay, post-core crown). First, the model repaired by the corresponding materials and repair methods was scanned by Micro CT. The image processing software Mimics 17.0 and Geomegic Studio 2013 were then used to reconstruct the three-dimensional digital models of the tooth and restoration, and a simplified three-dimensional model of the alveolar bone was created. Finally, the above model data was imported into the finite element analysis software for mechanical simulation (the force was loaded at an angle of 90o at 8, 3, 3 points and at an angle of 0o at 0 point, respectively).

RESULTS AND CONCLUSION: Under different loading conditions, in the post-core crown group, the stress was concentrated in the edge of restoration, the shoulder of the preparation, the neck of the residual dentin, and the middle part of post-core crown in the post-core crown group. In the inlay group, the stress was concentrated in the load point of the enamel, and was transferred along the tooth enamel to the tooth neck; the stress concentration area also included the gingival wall and undersurface and transition site corresponding to the inlays and preparations. In the onlay group, the stress concentration occurred at the contact between the onlay and the enamel, at the gingival wall and undersurface of the preparation, and at the transition site. The stress was also concentrated and distributed evenly in the corresponding pulp cavity of the onlay. To conclude, the onlays have applicability and superiority in the repair of large-area defects of the maxillary molars.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Inlays, Molar, Finite Element Analysis, Dental Stress Analysis, Tissue Engineering

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