Effect of occlusal contacts on stress distribution in the dentin and peridentium after post-core crown restoration
10.3969/j.issn.2095-4344.2017.04.021
- VernacularTitle:咬合接触对桩核冠修复后牙体及牙周组织应力分布的影响
- Author:
Wei YAO
;
Weiyi CHEN
;
Bing LI
;
Bin ZHAO
;
Wei WANG
- From:
Chinese Journal of Tissue Engineering Research
2017;21(4):615-620
- CountryChina
- Language:Chinese
-
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 maxil ofacial slight and severe defects, distal middle maxil ofacial slight and severe defects, proximal middle maxil ofacial 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.
