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Effect of noble metal conditioners on bonding between prosthetic composite material and silver-palladium-copper-gold
H Matsumura1, S Shimoe, K Nagano
1Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, Nagasaki, Japan. hmatsu@net.nagasaki-u.ac.jp
Statement Of Problem:
Mechanical retentive devices and the application of complicated surface preparation have been indispensable for bonding composite material to the metal substructure of restorations.
Purpose:
This study evaluated the priming effects of 4 metal conditioners on bonding between a prosthetic veneering material and a silver-palladium-based casting alloy.
Material And Methods:
Four primers designed for conditioning noble metal alloys (Alloy Primer, Metaltite, Metal Primer II, and V-Primer) were assessed (all materials contain organic sulfur compounds). Cast disk specimens made of silver-palladium-copper-gold alloy (Castwell M.C.12) were primed with 1 of the 4 primers, and bonded with a light-activated prosthetic composite material (Axis). Shear testing was performed before and after thermocycling for evaluation of bond durability.
Results:
All primed groups showed improved 24-hour bond strengths compared with the unprimed group. After thermocycling, 3 groups primed with the Metal Primer II, Alloy Primer, and Metaltite agents exhibited the highest bond strength.
Conclusion:
Use of 1-liquid metal conditioners containing sulfur compounds was a simple and useful method for improving bonding between the alloy and the composite material tested.