Effect of caries infiltrant application on shear bond strength of different adhesive systems to sound and demineralized enamel.
OBJECTIVE
To investigate the influence of caries infiltrant application on the shear bond strength of different adhesives on sound and demineralized enamel.


METHODS
Sound and artificially demineralized (14 days, acidic buffer, pH 5.0) bovine enamel specimens were treated with a caries infiltrant (Icon, DMG), three different commercial adhesives (unfilled etch and- rinse adhesive: Heliobond, Ivoclar Vivadent; filled etch-and-rinse adhesive: Optibond FL, Kerr; or self-etching adhesive: iBOND Self Etch, Heraeus Kulzer) or a combination of caries infiltrant and adhesive. The shear bond strength of a nanohybrid composite was analyzed after thermocycling (5000x, 5° to 55°C) at a crosshead speed of 1 mm/min. Failure mode was inspected under a stereomicroscope at 25X magnification.


RESULTS
In both sound and demineralized enamel, the shear bond strength of the caries infiltrant was not significantly different from the etch-and-rinse adhesives, while the self-etching adhesive showed significantly lower values compared to all other groups. Pretreatment with the caries infiltrant significantly increased the bond strength of the self-etching adhesive in both substrates and of the filled etch-and-rinse adhesive in demineralized enamel. While shear bond strength was not significantly different between the two substrates, cohesive failures were more likely to occur in demineralized than sound specimens.


CONCLUSIONS
The shear bond strength of the caries infiltrant was similar to the etch-and-rinse adhesives. The caries infiltrant did not impair bonding to sound or demineralized enamel, and even increased adhesion of the selfetching agent.
Department of Preventive Dentistry, University of Zurich, Zurich, Switzerland.
Liuhe
L
Jia
Bogna
B
Stawarczyk
Patrick R
PR
Schmidlin
Thomas
T
Attin
Annette
A
Wiegand
D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D003731:Dental Caries / Q000188:drug therapy*; D003743:Dental Enamel / Q000187:drug effects / Q000473:pathology; D003745:Dental Enamel Permeability; D045662:Dental Etching; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D053761:Nanocomposites; D019279:Resin Cements; D012117:Resins, Synthetic / Q000627:therapeutic use; D033081:Shear Strength
D019279:Resin Cements; D012117:Resins, Synthetic; C578177:icon infiltrant