Fatigue resistance of dentin/composite interfaces with an additional intermediate elastic layer
Jan De Munck
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorKirsten L. Van Landuyt
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorEduardo Coutinho
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorAndré Poitevin
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorMarleen Peumans
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorPaul Lambrechts
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorMarc Braem
Department TEWO, Laboratory of Dental Materials, University of Antwerp-RUCA, Antwerp, Belgium
Search for more papers by this authorBart Van Meerbeek
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorJan De Munck
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorKirsten L. Van Landuyt
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorEduardo Coutinho
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorAndré Poitevin
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorMarleen Peumans
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorPaul Lambrechts
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorMarc Braem
Department TEWO, Laboratory of Dental Materials, University of Antwerp-RUCA, Antwerp, Belgium
Search for more papers by this authorBart Van Meerbeek
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Search for more papers by this authorAbstract
According to the ‘elastic bonding’ concept, a thick intermediate layer of flexible resin has been suggested to absorb part of the polymerization shrinkage stress and to absorb shocks during function. In this study, the effect of an additional intermediate layer of a low-viscosity resin on the microrotary fatigue resistance (µRFR) of a hybrid composite bonded to dentin was evaluated. The hypotheses tested were that an intermediate layer of a low-viscosity resin (i) increases the µRFR to dentin, but (ii) has no effect on the static bond strength. Microtensile bond strength (µTBS) samples were loaded until failure or inserted in a microrotary fatigue testing device. Specimens were tested at 4 Hz until failure or until 105 cycles were reached. An additional intermediate elastic layer had no effect on the static µTBS, but significantly lowered the median µRFR from 28.4 MPa to 21.6 MPa. However, the application of an intermediate flexible layer had, no effect on the static µTBS. In conclusion, an additional elastic intermediate layer did decrease significantly the µRFR (rejection of hypothesis i), but did not alter the µTBS (acceptance of hypothesis ii). The decrease in µRFR most likely may be explained by the lower mechanical properties of the intermediary layer.
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