Shear Bond Strength Characteristics on Surface Treatment Modalities of CAD-CAM Resin Based Core Materials
Date of Award
Master of Science (MS)
Thompson, Geoffrey A.
Introduction: Innovations in computer aided design and computer aided manufacture (CAD-CAM) have made the manufacture of new restorative and prosthetic materials possible. They have enabled fabrication of complete arch implant supported fixed dental prosthesis (CAISFDP) in metals and polymers a reality. There are several materials which are available to fabricate a CAISFDP and it is important to find biologically, economically and aesthetically viable options for milled, cast and printed metal and non-metal structures. Objectives: The purpose of this in-vitro test was to analyze the shear bond strength of composite to Trilor material for CAISFDP restorations. Material and Methods: A total of 135 CAD- CAM resin composite blocks were cut and obtained from the discs (Trilor 95, Harvest Dental, CA), thickness 10 mm, length 10 mm, width 10 mm. The surfaces were treated with 110 μm Al2O3, Rocatec activated with silica-modified alumina oxide treatment (3M, USA), 50μm Al2O3, trimmed with a carbide bur, and no treatment. After surface treatment, it was gently cleansed with oil free steam and alcohol wipes. The surface conditioning was performed, and the manufacturer’s recommendations were followed for bonding with light cured Visio.link (Bredent). Cylinders of veneering composites (diameter 5 mm, height 4 mm) were polymerized on the Trilor surfaces through a plastic tube. Twenty-seven specimens were used for each testing group and aging test. Thermocycling, shear bond strength and scanning electron microscopic tests were performed. Means and standard deviations were calculated, and statistical analysis was performed with one-way ANOVA and post-hoc tukey tests. Results: The best shear bond strength was achieved for no surface treatment of Trilor and directly bonded with Visio.link and the least bond strength was found for Trilor surface abraded with 110 μm Al2O3. Conclusions: The results of this study indicated that when Trilor was used along with Visio.link as provided by the manufacturer, it had the best bond-strength. Changing its surface with a carbide bur intra-operatively would not change its bonding characteristic with composite materials.