Effects of surface treatments on shear bond strengths between a resin cement and an alumina core

• Published in: The Journal of prosthetic dentistry Vol. 83; no. 6; pp. 644 - 647
• Main Authors: Madani, Mehdi, Chu, Frederick C.S., McDonald, Ailbhe V., Smales, Roger J.
• Format: Journal Article
• Language: English
• Published: United States Mosby, Inc 01.06.2000
• Subjects: Aluminum Oxide - chemistry; Analysis of Variance; Chromium Alloys - chemistry; Dental Bonding - statistics & numerical data; Dental Porcelain - chemistry; Dentistry; Humans; In Vitro Techniques; Materials Testing - instrumentation; Materials Testing - methods; Materials Testing - statistics & numerical data; Phosphates - chemistry; Post and Core Technique; Resin Cements - chemistry; Silanes - chemistry; Surface Properties; Tensile Strength
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/S0022-3913(00)70063-1

Statement of Problem: Although bonding to all-ceramic restorations is desirable, there is little information on the use of resin cements containing a phosphate monomer, and the importance of different surface treatments on their adhesion to high-strength core materials. Purpose: This study attempted to determine the shear bond strength values between Panavia 21 resin cement (Kuraray) and an alumina core material (In-Ceram) after 3 surface treatments and the application of a silane coupling agent. Material and Methods: Forty-five In-Ceram cylindrical rods were fabricated and assigned to 3 groups. Group I specimens were treated with a 9.5% hydrofluoric (HF) acid, group II with a 5% HF acid, and group III were sandblasted. All specimens were coated with a silane coupling agent (Cavex Clearfil Photobond and Activator) before cementation with Panavia 21 to sandblasted nickel-chromium rods. As a control, group IV consisted of 8 porcelain (Vitadur Alpha) rods treated with a 5% HF acid and silane. All specimens were subjected to a load of 1.2 kg during cementation, then stored under water for 36 hours. A jig mounted on a Hounsfield Universal Testing machine was used at a crosshead speed of 0.5 mm/min to test the shear bond strengths. Results: The results were 14.65 ± 4.64 MPa for group I, 18.03 ± 6.13 MPa for group II, and 22.35 ± 5.98 MPa for group III In-Ceram specimens; and 18.05 ± 8.46 MPa for control (group IV). Conclusion: The use of Panavia 21 resin cement and a silane coupling agent can achieve a successful bond between either sandblasted or 5% HF acid-etched In-Ceram core material. (J Prosthet Dent 2000;83:644-7.)