Shear bond strength of orthodontic resins after caries infiltrant preconditioning.
OBJECTIVE
To investigate the influence of caries infiltrant preconditioning on the shear bond strength of orthodontic resin cements on sound and demineralized enamel.


METHODS
Stainless-steel brackets were bonded to sound or artificially demineralized (14 d, acidic buffer, pH 5.0) bovine enamel specimens using a resin cement or a combination of caries infiltrant preconditioning (Icon, DMG) and the respective resin cement (light-curing composite: Heliosit Orthodontic, Transbond XT, using either Transbond XT Primer or Transbond Plus Self Etching Primer; light-curing resin-modified glass ionomer cement: Fuji Ortho; or self-curing composite: Concise Orthodontic Bonding System). Each group consisted of 15 specimens. Shear bond strength was evaluated after thermo-cycling (10,000×, 5°C to 55°C) at a crosshead speed of 1 mm/min, and data were statistically analyzed by analysis of variance, Mann-Whitney test, and Weibull statistics. Adhesive Remnant Index (ARI) scores and enamel fractures were determined at 25× magnification and were statistically analyzed by regression analyses (P < .05).


RESULTS
The caries infiltrant system significantly increased the shear bond strength of Transbond XT Primer, Transbond Plus Self Etching Primer, and Fuji Ortho in sound specimens, and of all resin cements except for the Concise Orthodontic Bonding System in demineralized enamel. Overall, caries infiltrant preconditioning decreased significantly the number of enamel fractures, but it did not affect ARI scores.


CONCLUSIONS
Preconditioning of sound and demineralized enamel with the caries infiltrant system did not impair but rather increased the shear bond strength of most orthodontic resin cements while decreasing the risk of enamel fracture at debonding.
Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, 8032 Zurich, Switzerland.
Ewelina
E
Naidu
Bogna
B
Stawarczyk
Pune Nina
PN
Tawakoli
Rengin
R
Attin
Thomas
T
Attin
Annette
A
Wiegand
D000818:Animals; D002327:Cariostatic Agents; D002417:Cattle; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D008422:Materials Testing; D009967:Orthodontic Appliances; D019279:Resin Cements; D033081:Shear Strength
D002327:Cariostatic Agents; D019279:Resin Cements