The synergetic effect of pulp chamber extension depth and occlusal thickness on stress distribution of molar endocrowns: a 3-dimensional finite element analysis

Zhang, Yuejiao; Lai, Hongbin; Meng, Qingzhen; Gong, Qimei; Tong, Zhongchun

doi:10.1007/s10856-022-06677-0

Cited by 7 publications

(11 citation statements)

References 30 publications

(48 reference statements)

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“…Enamel has a higher modulus of elasticity and therefore serves to support restoration. The more enamel remaining, the more stress it is subjected to and the higher the peak stresses, which is in general agreement with the results of the mechanical study by Mangold and Kern on mandibular premolars [30]. The stress distribution cloud showed that the cervical areas of the different restorations were areas of high stress concentration, which is characteristic of the stress distribution phenomenon in natural teeth.…”

Section: Comparison Of Stress Distribution Of Different Restorations ...supporting

confidence: 88%

Comparison of the biomechanical effects of the post-core crown, endocrown and inlay crown after deep margin elevation and its clinical significance

Wu,

su,

Shi

et al. 2023

Preprint

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(1) Background: The purpose of this in vitro study was to compare and evaluate the stress distribution of maxillary first premolar residual crowns restored with post-core crowns, endocrowns and inlay crowns after deep margin elevation, to explore the optimal restoration for residual crowns using finite element analysis. (2) Methods: A healthy complete right maxillary first premolar from a male adult was scanned by cone beam computed tomography (CBCT). The finite element model of the tooth was established by reverse engineering software such as Mimics, Geomagic and Hypermesh. On this basis, the residual crown model after deep margin elevation was made, and the experimental group models were divided into three groups, those restored with post core crowns, endocrowns and inlay crowns. Vertical and oblique static loads were applied to the experimental models to simulate the force on the tooth during mastication (the loading position was located in the central fossa of the occipital surface, and the load was 100N) using Abaqus software. (3) Results: The peak value and distribution of von Mises stress in each part of the experimental model were observed. After deep margin elevation, the peak dentin von Mises stresses were lower than the tensile strength of normal dentin in the post-core crown, endocrown, and inlay crown groups; the lowest stress results were found in the post-core crown group for the dentin, restoration, enamel, and deep margin elevation (DME) layers under vertical and oblique loading. In terms of stress distribution clouds, the peak stresses in the dentin tissue were located in the apical 1/3 of the root after post -core crown restorations for both loads, while stress concentrations were evident in the cervical and root areas after endocrown and inlay crown restorations; regardless of the load and restoration method, the corresponding stress concentration areas appeared at the junction of the DME and dentin tissue at the loading site of the restorations; (4) Conclusions: Post-core crowns, endocrowns and inlay crowns can be used to restore residual crowns after deep margin elevation, and post-core crowns can better protect the residual tooth tissue.

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Section: Comparison Of Stress Distribution Of Different Restorations ...supporting

confidence: 88%

Comparison of the biomechanical effects of the post-core crown, endocrown and inlay crown after deep margin elevation and its clinical significance

Wu,

su,

Shi

et al. 2023

Preprint

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“…The depth of the pulp-chamber extension for the endocrown and the size of the surface area for adhesive retention are directly proportional to the successful transmission of chewing forces to the root. However, a 5 mm extension depth may damage the pulp-chamber floor of the mandibular molar depending on the anatomical conditions (26,27). These results suggest that the stress may intensify in the pulp-chamber extension of the restoration due to chewing force and may result in fracture in the future.…”

Section: Discussionmentioning

confidence: 95%

The effect of the material used and the pulp chamber extension depth on stress distribution of endocrowns: A three-dimensional finite element analysis

2022

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Purpose: The aim of this study was to examine the effects of materials used and length of extension into the pulp chamber on stress distribution in mandibular molar endodontic treated teeth with endocrown restoration using a 3D finite element analysis (FEA). Material and Methods: Three-dimensional finite element analysis models were obtained at 2 different pulpal extension depths by taking a tomography of a canal-treated mandibular molar tooth extracted for periodontal reasons: 2.5 mm (Model A), 3.5 mm (Model B). Models are divided into 3 groups according to material type: Vita Enamic (VE), Lava Ultimate (LU), IPS e.max CAD (EMX). There are also 2 different subgroups for the cement types used: NX3, and MaxCem Elite Chroma (MX) Maximum principal stress (MPa) values under 600 N vertical loads were investigated to evaluate the effect of restoration design, material type and cements used on stress distribution. Result: The maximum stress on the restoration was observed in the EMX material type (13,000 MPa) in the MX cement group in Model A, while the lowest was observed in the LU material (5,932 MPa) in the NX3 cement group in Model A. The highest stress areas for model A and model B were observed in the restoration areas corresponding to the enamel margins. Conclusions: Materials with higher elastic modulus show a high-stress area on the restoration surface, while the stress values they transmit are lower. Materials, where the elastic modulus is close to dentin have more homogeneous stress distributions within the restoration.

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“…For conventional crowns, a material thickness of 1–2 mm is typical [ 44 , 45 ]. In contrast, endocrowns are characterized by greater thicknesses, generally exceeding 4.0 mm [ 46 , 47 , 48 , 49 ]. This is due to the large combined thickness of the crown (at least 2.0 mm) and pulp chamber extension (over 2 mm), with the overall thickness exceeding 4.0 mm for endocrowns.…”

Section: Discussionmentioning

confidence: 99%

Impact of CAD/CAM Material Thickness and Translucency on the Polymerization of Dual-Cure Resin Cement in Endocrowns

Ikemoto,

Komagata,

Yoshii

et al. 2024

Polymers

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The objective of this study is to evaluate the impact of the thickness and translucency of various computer-aided design/computer-aided manufacturing (CAD/CAM) materials on the polymerization of dual-cure resin cement in endocrown restorations. Three commercially available CAD/CAM materials—lithium disilicate glass (e.max CAD), resin composite (CERASMART), and a polymer-infiltrated ceramic network (ENAMIC)—were cut into plates with five different thicknesses (1.5, 3.5, 5.5, 7.5, and 9.5 mm) in both high-translucency (HT) and low-translucency (LT) grades. Panavia V5, a commercial dual-cure resin cement, was polymerized through each plate by light irradiation. Post-polymerization treatment was performed by aging at 37 °C for 24 h under light-shielding conditions. The degree of conversion and Vickers hardness measurements were used to characterize the polymerization of the cement. The findings revealed a significant decrease in both the degree of conversion and Vickers hardness with increasing thickness across all CAD/CAM materials. Notably, while the differences in the degree of conversion and Vickers hardness between the HT and LT grades of each material were significant immediately after photoirradiation, these differences became smaller after post-polymerization treatment. Significant differences were observed between samples with a 1.5 mm thickness (conventional crowns) and those with a 5.5 mm or greater thickness (endocrowns), even after post-polymerization treatment. These results suggest that dual-cure resin cement in endocrown restorations undergoes insufficient polymerization.

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The synergetic effect of pulp chamber extension depth and occlusal thickness on stress distribution of molar endocrowns: a 3-dimensional finite element analysis

Cited by 7 publications

References 30 publications

Comparison of the biomechanical effects of the post-core crown, endocrown and inlay crown after deep margin elevation and its clinical significance

Comparison of the biomechanical effects of the post-core crown, endocrown and inlay crown after deep margin elevation and its clinical significance

The effect of the material used and the pulp chamber extension depth on stress distribution of endocrowns: A three-dimensional finite element analysis

Impact of CAD/CAM Material Thickness and Translucency on the Polymerization of Dual-Cure Resin Cement in Endocrowns

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