Effect of occlusal contacts on stress distribution in the dentin and peridentium after post-core crown restoration

doi:10.3969/j.issn.2095-4344.2017.04.021

Abstract

Abstract:

Abstract
BACKGROUND: The post-core crown system is an effective method for dental defect repair, but its repair outcomes are influenced by various factors; thereby, a further study is needed to optimize this method.
OBJECTIVE: To investigate the stress distribution in different degrees of dental defect after post-core crown restoration under different occlusal contacts.
METHODS: Three-dimensional models of the mandibular first molar were established by CT images, and models of complete natural teeth, six different defected teeth (total maxillofacial slight and severe defects, distal middle maxillofacial slight and severe defects, proximal middle maxillofacial slight and severe defects) and two different post-core crowns (fiber post and zirconia post) were created by software. These models were imported into ANSYS software to analyze the stress distribution in dentin and periodontium under stable occlusal contact (ABC) and unstable occlusal contact (AC), respectively.
RESULTS AND CONCLUSION: The stress in dentin and the periodontium after post-core crown restoration under AC was obviously higher than that under ABC, and AC affected the restored teeth more markedly. The post-core crown material with higher elastic modulus could induce higher stresses, and severe defected teeth showed higher stress distribution. Different defected types made no overt effects on the stress distribution in the periodontium. These results suggest that the B area contact is critical in regulating occlusal contacts of restoration.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

Key words: Bite Force, Post and Core Technique, Finite Element Analysis, Dental Stress Analysis, Tissue Engineering

CLC Number:

R318

Yao Wei1, 2, Chen Wei-yi1, Li Bing2, Zhao Bin2, Wang Wei3 . Effect of occlusal contacts on stress distribution in the dentin and peridentium after post-core crown restoration[J]. Chinese Journal of Tissue Engineering Research, 2017, 21(4): 615-620.

Figures/Tables 3

远中颌面缺损和全颌面缺损3种缺损形式之间无明显差异。在不稳定咬合接触(AC)条件下，牙本质应力峰值明显升高，纤维桩修复后高于完整天然牙16.4%，氧化锆桩修复后高于完整天然牙81.9%，且氧化锆桩修复后明显高于纤维桩修复56.8%。不稳定咬合接触时，牙本质应力峰值表现出重度缺损时高于轻度缺损的趋势，这种趋势在纤维桩修复时更明显，氧化锆桩修复时不明显；但是近中、远中和全部颌面缺损之间仍无明显差异。不稳定咬合与稳定咬合接触对牙本质应力峰值有明显影响，在完整天然牙，不稳定咬合接触时牙本质应力峰值比稳定咬合接触增加40.7%，桩核冠修复后，不稳定咬合接触时牙本质应力峰值比稳定咬合接触增加91.3%，纤维桩修复后增加96.4%，氧化锆桩修复后增加88.2%，说明桩核冠修复后，不稳定咬合接触对牙本质的应力增加幅度明显提高，尤其是纤维桩修复后增加幅度大。牙体组织应力水平在氧化锆桩修复后更高，尤其在不稳定咬合接触状态下，提示此时牙本质内部综合应力水平高，破坏风险大。 2.2 ABC稳定咬合接触及AC不稳定咬合接触下牙周膜的von Mises应力峰值和分布比较牙周膜应力与咬合接触状态有显著关系，不稳定咬合时牙周膜应力峰值显著上升。桩核材料选择对牙周膜应力峰值有影响，氧化锆桩修复后略高于纤维桩修复后。在不稳定咬合接触时不同缺损条件亦有影响，但不明显。应力峰值均见于牙颈部，根分叉及根尖区亦较高。以完整天然牙、全颌面轻度缺损和全颌面重度缺损为例示牙周膜von Mises应力峰值及应力分布，见图5，6。稳定咬合接触时，牙周膜应力峰值在桩核冠修复后均比完整天然牙低约39.5%，且与桩核材料有关，纤维桩高于氧化锆桩约7.4%，与缺损形式关系不明显。不稳定咬合接触时，牙周膜应力峰值与修复材料和缺损形式均有关，纤维桩修复后明显高于氧化锆桩修复后8.3%，"

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