Size-dependent strength of dental adhesive systems.
OBJECTIVE
The aim of this study is to explain the influence of peripheral interface stress singularities on the testing of tensile bond strength. The relationships between these theoretically predicted singularities and the effect of specimen size on the measured bond strength are evaluated.


METHODS
Finite element method (FEM) and boundary element method (BEM) analyses of microtensile bond strength test specimens were performed and the presence of localized high stress concentrations and singularities was analyzed. The specimen size effect predicted by the models was compared to previously published experimental data.


RESULTS
FEM analysis of single-material trimmed hour-glass versus cast cylindrical specimens showed different theoretical stress distributions, with the dumbbell or cylindrical specimens showing a more homogeneous distribution of the stress on the critical symmetry plane. For multi-material specimens, mathematical singularities at the free edge of the bonded interface posed a computational challenge that resulted in mesh-dependence in the standard FEM analysis. A specialized weighted-traction BEM analysis, designed to eliminate mesh-dependence by capturing the effect of the singularity, predicted a specimen size effect that corresponds to that published previously in the literature.


CONCLUSIONS
The results presented here further support the attention to specimen dimensions that has already broadened the empirical use of the microtensile test methods. FEM and BEM analyses that identify stress concentrations and especially marginal stress singularities must be accounted for in reliable bonding strength assessments. Size-dependent strength variations generally attributed to the effects of flaw distributions throughout the interfacial region are not as relevant as the presence of singularities at bonded joint boundaries - as revealed by both FEM and BEM analyses, when interpreted from a generalized fracture mechanics perspective. Furthermore, this size-dependence must be considered when evaluating or designing dental adhesive systems.
Department of Restorative Dentistry, SUNY at Buffalo, Buffalo, NY, USA. Electronic address: mc239@buffalo.edu.
Marc
M
Campillo-Funollet
Department of Mechanical and Aerospace Engineering, SUNY at Buffalo, Buffalo, NY, USA.
Gary F
GF
Dargush
Department of Mechanical and Aerospace Engineering, SUNY at Buffalo, Buffalo, NY, USA.
Richard A
RA
VanSlooten
Department of Mechanical and Aerospace Engineering, SUNY at Buffalo, Buffalo, NY, USA.
Joseph C
JC
Mollendorf
Department of Restorative Dentistry, SUNY at Buffalo, Buffalo, NY, USA.
Hyeongil
H
Kim
Department of Mechanical and Aerospace Engineering, SUNY at Buffalo, Buffalo, NY, USA.
Steven R
SR
Makowka
D003738:Dental Cements; D020342:Finite Element Analysis; D013718:Tensile Strength
D003738:Dental Cements
Adhesion; Boundary element method; Finite element method; Generalized fracture mechanics; Mesh dependence; Size-dependent behavior; Stress singularities; Tensile bond strength