Strengthening of a model composite restoration using shape optimization: A numerical and experimental study

H. Li; X. Yun; J. Li; L. Shi; A. S. Fok; M. J. Madden; J. F. Labuz

doi:10.1016/j.dental.2009.09.005

Strengthening of a model composite restoration using shape optimization: A numerical and experimental study

H. Li, X. Yun, J. Li, L. Shi, A. S. Fok, M. J. Madden, J. F. Labuz

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Objective: This study aims to validate a cavity shape optimization approach for improving the debonding resistance of dental restorations by carrying out fracture tests on restored model teeth with standard and optimized cavity designs. Method: The bio-mimetic stress-induced material transformation (SMT) optimization method was incorporated into the finite element (FE) program ABAQUS as a user material (UMAT) subroutine. The method uses stress minimization to optimize the cavity shape of a MOD restoration in an artificial premolar with special reference to the tooth-restoration interface under occlusal loads. The mechanical performance of the optimized design was first verified through FE analysis and then compared with that of the conventional design using fracture tests on model teeth. Results: The SMT optimization process indicated a T-shape cavity as a more favorable design for the MOD restoration in the artificial premolar. Compared with the conventional parallel wall, or undercut design, the T-shape cavity was shown numerically to reduce the interfacial stresses by up to 69%, and experimentally to increase the mean debonding resistance of the model teeth by 23% (p < 0.05). Significance: Cavity shape optimization can help increase the debonding resistance of restored teeth by reducing the interfacial stresses between tooth and restoration under occlusal loads.

Original language	English (US)
Pages (from-to)	126-134
Number of pages	9
Journal	Dental Materials
Volume	26
Issue number	2
DOIs	https://doi.org/10.1016/j.dental.2009.09.005
State	Published - Feb 2010

Bibliographical note

Funding Information:
This study was supported by the Grant-in-Aid program of the University of Minnesota . The authors would like to acknowledge the Minnesota Dental Research Center for Biomaterials and Biomechanics (MDRCBB) for providing the testing devices and the Minnesota Supercomputing Institute (MSI) for providing the computing services for this study.

Keywords

Cavity shape
Debonding resistance
Dental restoration
Finite element method
Shape optimization

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10.1016/j.dental.2009.09.005

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title = "Strengthening of a model composite restoration using shape optimization: A numerical and experimental study",

abstract = "Objective: This study aims to validate a cavity shape optimization approach for improving the debonding resistance of dental restorations by carrying out fracture tests on restored model teeth with standard and optimized cavity designs. Method: The bio-mimetic stress-induced material transformation (SMT) optimization method was incorporated into the finite element (FE) program ABAQUS as a user material (UMAT) subroutine. The method uses stress minimization to optimize the cavity shape of a MOD restoration in an artificial premolar with special reference to the tooth-restoration interface under occlusal loads. The mechanical performance of the optimized design was first verified through FE analysis and then compared with that of the conventional design using fracture tests on model teeth. Results: The SMT optimization process indicated a T-shape cavity as a more favorable design for the MOD restoration in the artificial premolar. Compared with the conventional parallel wall, or undercut design, the T-shape cavity was shown numerically to reduce the interfacial stresses by up to 69%, and experimentally to increase the mean debonding resistance of the model teeth by 23% (p < 0.05). Significance: Cavity shape optimization can help increase the debonding resistance of restored teeth by reducing the interfacial stresses between tooth and restoration under occlusal loads.",

keywords = "Cavity shape, Debonding resistance, Dental restoration, Finite element method, Shape optimization",

author = "H. Li and X. Yun and J. Li and L. Shi and Fok, {A. S.} and Madden, {M. J.} and Labuz, {J. F.}",

note = "Funding Information: This study was supported by the Grant-in-Aid program of the University of Minnesota . The authors would like to acknowledge the Minnesota Dental Research Center for Biomaterials and Biomechanics (MDRCBB) for providing the testing devices and the Minnesota Supercomputing Institute (MSI) for providing the computing services for this study. ",

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doi = "10.1016/j.dental.2009.09.005",

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T2 - A numerical and experimental study

AU - Li, H.

AU - Yun, X.

AU - Li, J.

AU - Shi, L.

AU - Fok, A. S.

AU - Madden, M. J.

AU - Labuz, J. F.

N1 - Funding Information: This study was supported by the Grant-in-Aid program of the University of Minnesota . The authors would like to acknowledge the Minnesota Dental Research Center for Biomaterials and Biomechanics (MDRCBB) for providing the testing devices and the Minnesota Supercomputing Institute (MSI) for providing the computing services for this study.

PY - 2010/2

Y1 - 2010/2

N2 - Objective: This study aims to validate a cavity shape optimization approach for improving the debonding resistance of dental restorations by carrying out fracture tests on restored model teeth with standard and optimized cavity designs. Method: The bio-mimetic stress-induced material transformation (SMT) optimization method was incorporated into the finite element (FE) program ABAQUS as a user material (UMAT) subroutine. The method uses stress minimization to optimize the cavity shape of a MOD restoration in an artificial premolar with special reference to the tooth-restoration interface under occlusal loads. The mechanical performance of the optimized design was first verified through FE analysis and then compared with that of the conventional design using fracture tests on model teeth. Results: The SMT optimization process indicated a T-shape cavity as a more favorable design for the MOD restoration in the artificial premolar. Compared with the conventional parallel wall, or undercut design, the T-shape cavity was shown numerically to reduce the interfacial stresses by up to 69%, and experimentally to increase the mean debonding resistance of the model teeth by 23% (p < 0.05). Significance: Cavity shape optimization can help increase the debonding resistance of restored teeth by reducing the interfacial stresses between tooth and restoration under occlusal loads.

AB - Objective: This study aims to validate a cavity shape optimization approach for improving the debonding resistance of dental restorations by carrying out fracture tests on restored model teeth with standard and optimized cavity designs. Method: The bio-mimetic stress-induced material transformation (SMT) optimization method was incorporated into the finite element (FE) program ABAQUS as a user material (UMAT) subroutine. The method uses stress minimization to optimize the cavity shape of a MOD restoration in an artificial premolar with special reference to the tooth-restoration interface under occlusal loads. The mechanical performance of the optimized design was first verified through FE analysis and then compared with that of the conventional design using fracture tests on model teeth. Results: The SMT optimization process indicated a T-shape cavity as a more favorable design for the MOD restoration in the artificial premolar. Compared with the conventional parallel wall, or undercut design, the T-shape cavity was shown numerically to reduce the interfacial stresses by up to 69%, and experimentally to increase the mean debonding resistance of the model teeth by 23% (p < 0.05). Significance: Cavity shape optimization can help increase the debonding resistance of restored teeth by reducing the interfacial stresses between tooth and restoration under occlusal loads.

KW - Cavity shape

KW - Debonding resistance

KW - Dental restoration

KW - Finite element method

KW - Shape optimization

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Strengthening of a model composite restoration using shape optimization: A numerical and experimental study

Abstract

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