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Fracture simulation of restored teeth using a continuum damage mechanics failure model
Haiyan Li1, Jianying Li, Zhenmin Zou
1Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN 55455, United States. lixx0775@umn.edu
Summary
This study validates a finite-element continuum damage mechanics (CDM) model for simulating restored tooth fracture. The model accurately predicts debonding and failure, offering a viable tool for dental restoration analysis.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Dental Research
Background:
- Dental restorations are susceptible to debonding and fracture.
- Accurate simulation of failure mechanisms is crucial for improving restoration longevity.
- Finite-element analysis (FEA) offers a powerful tool for predicting mechanical behavior.
Purpose of the Study:
- To validate a finite-element (FE) based continuum damage mechanics (CDM) failure model.
- To simulate the debonding and fracture of restored teeth.
- To assess the predictive capability of the CDM model in dental applications.
Main Methods:
- Fracture testing of plastic model teeth with and without Class-II MOD restorations.
- Construction and analysis of 2D FE models using ABAQUS software.
- Implementation of a CDM failure model via a user element subroutine (UEL).
- Obtaining material parameters for the CDM model through mechanical testing.
- Comparing simulation results with experimental data for validation.
Main Results:
- The CDM model successfully reproduced failure processes in intact and restored model teeth.
- Adjustments for size effects were necessary for fracture parameters derived from small specimens.
- The CDM model demonstrated viability in predicting debonding and fracture in dental restorations.
Conclusions:
- The validated FE-based CDM model is a reliable tool for simulating restored tooth failure.
- The study highlights the importance of considering size effects in fracture parameter determination.
- This approach can aid in the design and evaluation of dental restorations.
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