Finite Element Analysis of Maxillary First Premolars Repaired with Different Onlay Materials

doi:10.13701/j.cnki.kqyxyj.2020.11.018

Abstract

Abstract: Objective: To investigate the intensity and distribution of stress after the restoration of the first maxillary premolar with large defect by using four different materials. Methods: One normal and intact first maxillary premolar was collected. Through CBCT scanning technology, Mimics19.0, Hypermesh2017, and Ansys19.0 reverse engineering software, 3D finite element model of large defects was established. Gold alloy, zirconia, composite resin, and glass-ceramic were used to restore the defect in the form of onlay. The intensity and distribution of maximum principal stress of onlay and residual dental tissues were observed when loaded vertically and laterally. Results: For the remaining tooth tissues, the order of maximum principal stress of tooth enamel under vertical loading was: composite resin > glass-ceramic > zirconia = gold alloy, the order of maximum principal stress of tooth enamel under lateral loading was: composite resin > zirconia > gold alloy > glass-ceramic. For the repair materials, the order of maximum principal stress of the onlay under vertical loading was: gold alloy > zirconia > glass-ceramic > composite resin, the order of maximum principal stress of the onlay under the lateral loading was: zirconia > glass-ceramic > composite resin > gold alloy. Conclusion: For large defects of the first maxillary premolar, the first choice is glass-ceramic onlay, however, with recommendation to reduce the inclination of the tooth tip and provide occlusal adjustment.

Key words: onlay, the first maxillary premolar, finite element methods, large defect, irregular cavity shape, the maximum principle stress

WEI Zhenhui, SUN Heting, GAO Zhiyin, WANG Wei, ZHANG Jiao, ZHANG Peng, WANG Jinhai. Finite Element Analysis of Maxillary First Premolars Repaired with Different Onlay Materials[J]. Journal of Oral Science Research, 2020, 36(11): 1065-1068.

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