By Gordon J. Christensen, DDS, MSD, PhD
This study compared the bond of 3M ESPE RelyX ARC resin cement to base and noble metal alloys. The metal surfaces were treated in one of three ways:
- Simulated porcelain firing to produce an oxide layer on the metal
- Airborne particle abrasion of the metal surface with aluminum oxide
- Chemical treatment with “alloy primer” from Kuraray Medical Inc.
Specimens were bonded together, thermal cycled, and debonded on an Instron testing machine.
Whether the metal was base or noble, the bond was least when oxidized only, intermediate when aluminum oxide blasted, and best when treated with the metal primer. (Abreau A, Loza M, et al. Tensile bond strength of an adhesive resin cement to different alloys having various surface treatments. J Prosthet Dent Feb. 2009; 101(2):107-18.)
Dr. Gordon Christensen comments: Enhancement of bond of resin cement to metal or PFM crowns is often desirable for short or tapered preps.
Vol 14, Issue 6
Click here to read more clinical tips and current research from Dr. Gordon Christensen.
Dr. Christensen is a practicing prosthodontist in Provo, Utah, and a Diplomate for the American Board of Prosthodontics. He is the founder and director of Practical Clinical Courses, an international continuing education organization initiated in 1981 for dental professionals. Dr. Christensen is a cofounder (with his wife, Rella) and senior consultant of CLINICIANS REPORT (formerly Clinical Research Associates), which has conducted research in all areas of dentistry since 1976. Dr. Christensen is an adjunct professor for Brigham Young University and the University of Utah.