Three-dimensional Finite Element Analysis of the Influence of Base Materials and Thickness on Stress Distribution of Mandibular Second Deciduous Molar Restored with Inlay

doi:10.13701/j.cnki.kqyxyj.2022.07.015

Abstract

Abstract: Objective: To analyze the influence of base material and its thickness on stress distribution of the mandibular second deciduous molar which repaired with inlay after root canal treatment by three-dimensional finite element analysis. Methods: A three-dimensional finite element model of mandibular second deciduous molar with mesial and occlusal defects was established by CBCT scanning, and the resin inlay was simulated for restoration. The experimental group selected three kinds of materials with increasing elastic modulus (light cure glass ionomer, flowable composite resin, and high strength glass ionomer) and three kinds of thicknesses (0.5 mm, 1.0 mm, and 1.5 mm) as the base. The control group was without base. By loading a force of 100 N in the axial and lateral directions (45°) respectively, the stress distribution of tooth and inlay was observed, and the stress concentration positions and the change of peak stress were compared. Results: When axial and lateral forces were loaded, (1) stress concentration position: the stress concentration positions of experimental group and control group were similar, the stress of the mandibular second deciduous molar was mainly concentrated on the neck with the largest in the mesial and lingual, and the stress of the inlay was mainly concentrated on the occlusal and mesial; (2) peak stress change: the peak stress of the tooth was decreased when the thickness and elastic modulus of the base material were increased. However, the peak stress of the inlay was firstly decreased and then increased with the increase of the thickness of base material. And the peak stress of inlay did not change significantly under axial loading but decreased under lateral loading with the increase of elastic modulus. Conclusion: Base material with high elastic modulus and suitable thickness is beneficial to alleviate the stress concentration of mandibular second deciduous molar and the resin inlay after root canal treatment.

Key words: base materials, base thickness, mandibular second deciduous molar, three-dimensional finite element analysis

CAI Changyu, FENG Na, YANG Yu'e. Three-dimensional Finite Element Analysis of the Influence of Base Materials and Thickness on Stress Distribution of Mandibular Second Deciduous Molar Restored with Inlay[J]. Journal of Oral Science Research, 2022, 38(7): 654-658.

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