Impact of treatment modalities on stress distribution in maxillary incisors with varying levels of external cervical resorption: a finite element analysis.

IF 3.1 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

BMC Oral Health Pub Date : 2025-10-06 DOI:10.1186/s12903-025-06562-6

Ayca Yilmaz, Alper Kabakci, Dilek Helvacioglu Yigit

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Abstract

Background: The aim of this study was to evaluate the impact of various treatment modalities on the mechanical behaviour of a simulated maxillary central incisor with external cervical resorption (ECR) at different progression levels using finite element analysis (FEA).

Methods: A three-dimensional (3D) model of a maxillary central incisor and surrounding tissues was created. The model was modified to include vestibular or palatal ECR defects of varying heights and circumferential angles. The root canal and the resorption defect were restored using gutta-percha and various repair materials. The models underwent simulated oblique loading of 100 N on the palatal surface. Von Mises stresses within the dentin were evaluated through FEA.

Results: The mean maximum stress for models with vestibular ECR defects was greater than that for palatinal defects. Complete filling of both the root canal and defect with BioAggregate resulted in the lowest average dentin stresses (5.79 ± 0.11 MPa), while filling the root canal with gutta-percha and the ECR cavity with glass ionomer cement resulted in the highest (6.19 ± 0.05 MPa).

Conclusions: From a mechanical standpoint, filling the root canal with gutta-percha and repairing the resorption defect with Biodentine is the appropriate management option when ECR occurs on the vestibular surface.

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治疗方式对不同颈椎外吸收水平上颌门牙应力分布的影响：有限元分析。

背景：本研究的目的是利用有限元分析（FEA）来评估不同治疗方式对模拟上颌中切牙不同进展水平的外颈椎吸收（ECR）力学行为的影响。方法：建立上颌中切牙及周围组织的三维模型。该模型被修改以包括前庭或腭不同高度和周向角度的ECR缺陷。采用杜仲胶及各种修复材料修复根管及吸收缺损。模型在腭表面模拟施加100 N的斜向载荷。采用有限元法对牙本质内的Von Mises应力进行了分析。结果：前庭ECR缺损模型的平均最大应力大于腭部缺损模型。生物骨料完全充填根管和缺损时，牙质平均应力最低（5.79±0.11 MPa），而胶浆充填根管和玻璃离子水门汀充填ECR腔时，牙质平均应力最高（6.19±0.05 MPa）。结论：从力学角度来看，前庭表面发生ECR时，用杜胶填充根管和生物牙妥定修复吸收缺损是合适的治疗选择。

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

BMC Oral Health DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.90

自引率

6.90%

发文量

481

审稿时长

6-12 weeks

期刊介绍： BMC Oral Health is an open access, peer-reviewed journal that considers articles on all aspects of the prevention, diagnosis and management of disorders of the mouth, teeth and gums, as well as related molecular genetics, pathophysiology, and epidemiology.