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2 "Von Mises"
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Research Article
Stress distribution of restorations in external cervical root resorption under occlusal and traumatic loads: a finite element analysis
Padmapriya Ramanujam, Paul Kevin Abishek Karthikeyan, Vignesh Srinivasan, Selvakarthikeyan Ulaganathan, Velmurugan Natanasabapathy, Nandini Suresh
Restor Dent Endod 2025;50(2):e21.   Published online May 21, 2025
DOI: https://doi.org/10.5395/rde.2025.50.e21
AbstractAbstract PDFPubReaderePub
Objectives
This study analyzed the stress distribution in a maxillary central incisor with external cervical resorptive defect restored with different restorative materials under normal masticatory and traumatic loading conditions using finite element analysis.
Methods
Cone-beam computed tomography of an extracted intact incisor and created resorptive models (Patel’s 3D classification-2Bd and 2Bp) in the maxillary central incisor was performed for finite element models. The 2Bd models were restored either with glass ionomer cement (GIC)/Biodentine (Septodont) or a combination of both with composite resin. 2Bp models were restored externally with a combination technique and internally with root canal treatment. The other model was external restoration with GIC and internal with fiber post. Two masticatory loads were applied at 45˚ to the palatal aspect, and two traumatic loads were applied at 90˚ to the buccal aspect. Maximum von Mises stresses were calculated, and stress distribution patterns were studied.
Results
In 2Bd models, all restorative strategies decreased stress considerably, similar to the control model under all loads. In 2Bp models, the dentin component showed maximum stress at the deepest portion of the resorptive defect, which transfers into the adjacent pulp space. In 2Bp defects, a multilayered restoration externally and root canal treatment internally provides better stress distribution compared to the placement of a fiber post.
Conclusions
Increase in load, proportionally increased von Mises stress, despite the direction or angulation of the load. Multilayered restoration is preferred for 2Bd defects, and using an internal approach of root canal treatment is suggested to restore 2Bp defects.
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Original Article
The effect of restorative materials on the stress distribution of class V composite resin restorations - a 3D finite element investigation
Hyoung-Ryoul Ahn, Hyeon-Cheol Kim, Bock Huh, Jeong-Kil Park
J Korean Acad Conserv Dent 2006;31(1):20-29.   Published online January 31, 2006
DOI: https://doi.org/10.5395/JKACD.2006.31.1.020
AbstractAbstract PDFPubReaderePub

The purpose of this study was to analyze the stress distribution aspect of unrestored and restored combined shape (wedge shape occlusally and saucer shape gingivally) class V cavity, which found frequently in clinical cases.

A maxillary second premolar restored with a combined shape class V composite restorations were modeled using the three dimensional finite element method. Static occlusal load of 170 N was applied on lingual incline of buccal cusp at the angle of 45° with the longitudinal axis of the tooth. And three dimensional finite element analysis was taken by ANSYS (Version 6.0, Swanson Analysis System Co., Houston, U.S.A) program which represent the stress distribution on unrestored and restored cavity wall and margin.

The conclusions were as follows.

Compared to the unrestored cavity, Von Mises stress at the cementoenamel junction and line angle of the cavity base were reduced and in restored cavity.

Von Mises stress at the occlusal and cervical cavity margin and wall were increased in restored cavity in comparison with the unrestored cavity.

In the hybrid and hybrid/flowable composite resin restoration, Von Mises stress at the cementoenamel junction and line angle of the cavity base were reduced more than in the flowable restoration.

In the hybrid and hybrid/flowable composite resin restoration, Von Mises stress at the occlusal and cervical cavity margin and wall were increased more than in the flowable restoration.

Citations

Citations to this article as recorded by  
  • Comparison of marginal microleakage between low and high flowable resins in class V cavity
    Sang-Bae Bae, Young-Gon Cho, Myeong-Seon Lee
    Journal of Korean Academy of Conservative Dentistry.2009; 34(6): 477.     CrossRef
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