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BMC Oral Health

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Open Access 01-12-2021 | Computer Aided Design | Research

Influence of restorative material and cement on the stress distribution of endocrowns: 3D finite element analysis

Authors: Jiahui He, Ziting Zheng, Min Wu, Chunqing Zheng, Yuting Zeng, Wenjuan Yan

Published in: BMC Oral Health | Issue 1/2021

Abstract

Purpose

This study aimed to evaluate the influence of different types of restorative materials and resin cements on the stress distribution in the regions of the restoration, cement layer and dental remnant in endodontically treated posterior endocrowns.

Methods

A 3D finite element analysis (FEA) model of the first mandibular molar that was restored with an endocrown designed by computer-aided design (CAD) software was generated. Three kinds of restorative materials (Vita Enamic (VE), IPS e.max CAD (EMX) and Grandio blocs (GR)) and two types of cementing materials (NX3 and Maxcem Elite Chroma (MX)) were analysed with such a model. The food layer was also designed before vertical (600 N) forces were applied to simulate physiological masticatory conditions. Thermal expansion was used to simulate the polymerization shrinkage effects of cement layers. The results were obtained by colorimetric graphs of the maximum principal stress in the restoration and tooth remnant. The failure risk of the cement layer was also calculated based on the normal stress.

Results

The elastic modulus was positively correlated with the tensile stress peak values in the restoration, mainly at the intaglio surface. However, in the cervical enamel and cement layer, restorative material with a higher elastic modulus generated lower peak stress values. The cement with a higher elastic modulus resulted in higher stress peak values inside the cement layer. The combination of EMX (restorative material) and NX3 (cement material) in the cement layer resulted in the lowest failure risk.

Significance

The ceramic material EMX with a higher elastic modulus appeared to be more effective at protecting the cement layer and residual enamel tissue. Based on the analysis of the failure risk of the cement layer, the combination of EMX and NX3 was recommended as an optional material for endocrowns for endodontically treated posterior teeth.

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Title: Influence of restorative material and cement on the stress distribution of endocrowns: 3D finite element analysis
Authors: Jiahui He
Ziting Zheng
Min Wu
Chunqing Zheng
Yuting Zeng
Wenjuan Yan
Publication date: 01-12-2021
Publisher: BioMed Central
Keyword: Computer Aided Design
Published in: BMC Oral Health / Issue 1/2021
Electronic ISSN: 1472-6831
DOI: https://doi.org/10.1186/s12903-021-01865-w

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Influence of restorative material and cement on the stress distribution of endocrowns: 3D finite element analysis

Abstract

Purpose

Methods

Results

Significance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Significance

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