Optimization of endocrown design parameters for mandibular second molars: A 3D finite element analysis

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL

Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2025-04-29 DOI:10.1016/j.jmbbm.2025.107038

Xuechun Dong , Jinghao Ban , Huihui Guo , Ziyu Zeng , Nan Ren , Shizhu Bai , Zhongshan Wang

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引用次数: 0

Abstract

This study aimed to investigate the optimal parameters for endocrown design in mandibular second molars using three-dimensional finite element analysis. Eighteen finite element models(n = 3)were created with varying ferrule heights (0, 1, 2 mm), post space depths (2, 3, 4 mm), and diameters (2, 3 mm). The models simulated zirconia endocrowns on root canal treated teeth. Von Mises stress distribution was analyzed under 200 N oblique loading. Results showed that in butt-joint designs, increasing post space depth and diameter led to higher stress concentration at the post apex and lower stress at the mesial-buccal bonding interface. For ferrule designs, increasing ferrule height reduced stress at both the post apex and bonding interface. Stress in dentin increased with post space depth and diameter in butt-joint designs but decreased with increased ferrule height in ferrule designs. The study concluded that smaller post space dimensions (diameter and depth) reduce dentin stress in both butt-joint and ferrule endocrown designs, thereby indicating better protection of the remaining tooth structure. Ferrule designs exhibited a more uniform stress distribution compared to butt-joint designs. These findings suggest that endocrown design can be optimized to enhance stress distribution and potentially improve clinical outcomes, though further long-term clinical studies are needed to validate these results.

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下颌第二磨牙内冠设计参数优化：三维有限元分析

本研究采用三维有限元方法探讨下颌第二磨牙内冠设计的最佳参数。创建了18个有限元模型（n = 3），分别具有不同的卡套高度（0,1,2 mm），柱空间深度（2,3,4 mm）和直径（2,3 mm）。模型模拟了氧化锆内冠在根管治疗牙体上的作用。分析了200 N斜载荷下的Von Mises应力分布。结果表明：在对接设计中，增大桩间距深度和直径，桩尖处应力集中增大，中颊结合部应力集中减小；对于卡箍设计，增加卡箍高度可以降低后端和粘接界面的应力。在对接设计中，牙本质应力随桩间距深度和直径的增加而增加，而在套圈设计中，应力随套圈高度的增加而降低。该研究得出结论，较小的桩位空间尺寸（直径和深度）可以减少对接和卡箍内冠设计中的牙本质应力，从而更好地保护剩余的牙齿结构。与对接设计相比，套圈设计表现出更均匀的应力分布。这些发现表明，内冠设计可以优化以增强应力分布，并可能改善临床结果，尽管需要进一步的长期临床研究来验证这些结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.