Related Experiment Video
Updated: Apr 6, 2026
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
In vitro evaluation of the bond strength of composite resin foundation materials to dentin
Asim Al-Ansari1, Fahad Al-Harbi2, Nadim Z Baba3
1Assistant Professor, Department of Preventive Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia.
Statement Of Problem:
Achieving adequate bonding of composite resin foundation materials to dentin can be a challenge. Bonding can be affected by the type of bonding material and method used.
Purpose:
The purpose of this in vitro study was to test the bond strengths of selected dual-polymerizing composite resin foundation materials to dentin using light, chemical, or dual-polymerized adhesive systems.
Material And Methods:
Eighty freshly extracted human third molars were sectioned vertically into mesial and distal halves and embedded in acrylic resin using a copper cylinder. Specimens were divided into 16 groups. Each group received a resin foundation that was bonded to dentin according to each manufacturer's instructions. All tested foundations were dual polymerized except Tetric Ceram, which was light polymerized. BisCore, Build-it, CompCore, CoreRestore, and FluoroCore resin foundation materials were bonded to dentin with the use of the corresponding adhesives in 3 different bonding methods: adhesive was light polymerized; adhesive was chemically polymerized; and adhesive was dual polymerized. Each specimen was seated in a custom shear test device, and a load was applied with the descending rod of the jig from a mechanical testing machine with a perpendicular force to the dentin-adhesive interface. Statistical analysis was performed using 2-way ANOVA and post hoc pairwise comparison with Tukey test when statistically significant differences were found (α=.05).
Results:
Resin foundation materials bonded to dentin with light-polymerized adhesives produced significantly higher bond strengths than when bonded with chemically or dual-polymerized adhesives. No significant difference was found between the single-component and multiple-components adhesives used with Tetric Ceram and BisCore foundations (P=.083). However, BisCore used with All-Bond 2 adhesive (multiple components) produced significantly lower bond strengths than when used with One-Step (P=.024). Adhesive failure was the most common failure location. Cohesive failures occurred mostly in specimens bonded with light-polymerized adhesives.
Conclusions:
The light-polymerized adhesives tested produced significantly higher bond strengths when used without chemical activators. The dual-polymerized core foundations produced better bond strengths to dentin when used with light-polymerized adhesives without chemical activators. In comparing single-component with multiple-component adhesive systems with their respective core resins, no difference was found in bond strengths to dentin.
