Bond strengths of silicoated and acrylic resin bonding systems to metal.
BACKGROUND
The Kevloc bonding system is based on the bond of acrylic resin with the metal surface, in contrast to the Silicoater system, which covers the metal surface with a SiOx-C layer. Bonding prevents the occurrence of the marginal gap between the metal and the resin, which causes weaker bond strengths and discoloration.


OBJECTIVE
This investigation examined the bond strength values achieved by using the Kevloc technique on Ag-Pd and Co-Cr alloys, and compared them with those obtained by the Silicoater technique. After artificial aging, shear testing of the specimens was performed.


METHODS
A microscope image analyzer measured the thickness of bonding layers to reveal any marginal gap.


RESULTS
No marginal gap was noticed for either technique. The Kevloc technique provided better results than Silicoater regardless of alloy used. Immersion in water (7.64 to 8. 05 MPa) and thermocycling (6.12 to 6.95 MPa) reduced the initial bond strength values (12.52 to 12.94 MPa), but the breakdown occurred between the opaque layers or between the opaque and the resin, thus giving a cohesive type of failure.


CONCLUSIONS
The dental alloy used did not affect bond strengths and artificial aging caused reduction in bond strengths. The Kevloc bonding system exhibited higher bond strengths than Silicoater, but the marginal gap was not seen for either bonding system.
Vojvodic
D
D
School of Dental Medicine, University of Zagreb, Zagreb, Croatia.
Jerolimov
V
V
Celebic
A
A
Catovic
A
A
D000180:Acrylic Resins / Q000737:chemistry*; D000181:Acrylonitrile / Q000031:analogs & derivatives* / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D003116:Color; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D006571:Heterocyclic Compounds / Q000737:chemistry*; D007091:Image Processing, Computer-Assisted; D007101:Immersion; D008422:Materials Testing; D008853:Microscopy; D010165:Palladium / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; D002858:Chromium Alloys; D003722:Dental Alloys; D006571:Heterocyclic Compounds; D012821:Silanes; C112072:kevloc; D014867:Water; D012834:Silver; D010165:Palladium; D000181:Acrylonitrile