Title: 0836 - Shear-Bond-Strength of Nine Dual-Cured Build-Up Materials and a Light-Curing-Adhesive-System on Dentin
Deepali Malla (Presenter)
University of the Pacific
Karen Schulze, University of the Pacific
Patrick Roetzer, University of the Pacific
Objectives: The purpose of this study was to measure the shear bond strength of nine different commercially available dual cured core build-up materials on human dentin in conjunction with a light curing adhesive system. The null hypothesis was that there is no statistical significant difference among the core build-up systems.
Methods: A total of 54 human molars were cross-sectioned, roots cut off and embedded in acrylic composites to expose the coronal portion of dentin. Nine commercially available core build-up materials have been selected for shear bond testing: CompCore(Premier), GrandioCore(VOCO), ParaCore(Coltene), BuilditFR(Pentron), LuxaCore(DMG), MultiCoreFlow(Ivoclar), ClearfilDCPlus(Kuraray), Permaflow(Ultradent), Encore(Centrix). All core build-up materials were tested with the Scotchbond-Universal Adhesive System(3M ESPE). Six specimens per group were tested. The exposed flat dentin surface from the samples was treated with Scotchbond-Universal adhesive in the self-etching mode according to manufacturer’s instructions. It is an all-in-one adhesive material. The treated sample was placed in a bonding clamp followed by the core build-up application. All core materials were setting in the dark-cure mode. After removal the samples were stored for 24h at 36 degree Celsius and 100% humidity. The Ultratester(Ultradent) was used to shear off the build-up composite from the samples at 1mm per min. Statistical analysis was done with student t-test at a 0.05% confidence interval.
Results: The shear bond strength averages in MPa for the core materials were as follows: CompCore 22.0(±10.0),GrandioCor 22.1(±8.4), ParaCore 9.2(±1.2), Buildit FR 15.0(±7.1), LuxaCore 25.0(±7.1), MultiCore Flow 25.6(±9.2), ClearfilDCPlus 22.3(±6.4), Permaflow 20.8(±9.4), Encore 23.8(±23.8). Significant lower shear-bond-strength was found for ParaCore(Coltene) compared to all other core materials except in comparison with BuilditFR (Pentron) p=0.078. All other materials were not statistically different.
Conclusions: A desired average of more than 20 MPa was reached for all core materials except for ParaCore(Coltene) and BuilditFR(Pentron).
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE