Effect of noble metal conditioners on bonding between prosthetic composite material and silver-palladium-copper-gold alloy.
BACKGROUND
Mechanical retentive devices and the application of complicated surface preparation have been indispensable for bonding composite material to the metal substructure of restorations.


OBJECTIVE
This study evaluated the priming effects of 4 metal conditioners on bonding between a prosthetic veneering material and a silver-palladium-based casting alloy.


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.


CONCLUSIONS
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.
Matsumura
H
H
Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, Nagasaki, Japan. hmatsu@net.nagasaki-u.ac.jp
Shimoe
S
S
Nagano
K
K
Atsuta
M
M
D003188:Composite Resins / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D006047:Gold Alloys / Q000737:chemistry*; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013314:Stress, Mechanical; D013457:Sulfur Compounds / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D013816:Thermodynamics; D014227:Triazines / Q000737:chemistry
D003188:Composite Resins; D003722:Dental Alloys; D006047:Gold Alloys; D008689:Methacrylates; D019279:Resin Cements; D013457:Sulfur Compounds; D013501:Surface-Active Agents; D014227:Triazines; C107059:V-Primer; D012834:Silver; D010165:Palladium; D003300:Copper; C069749:methacryloyloxydecyl dihydrogen phosphate; C076160:6-(4-vinylbenzyl-n-propyl)amino-1,3,5-triazine-2,4-dithiol