Effect of water storage on bond strength of self-etching adhesives to dentin.
OBJECTIVE
The objective of this study was to evaluate the bond strength of self-etching adhesive systems one week and one year after storage in water.


METHODS
Fragments from the buccal surfaces of 45 bovine teeth were prepared (12 mm in length x 5 mm in width x 1.0 mm in thickness). Dentin surfaces were wet-abraded with 600-grit SiC paper to create a standardized smear layer. Samples were randomly assigned to 18 experimental groups (n=5), according to nine adhesive systems tested (Single Bond; Adper Prompt L-Pop; iBond; One-Up Bond F; Xeno III; Clearfil SE Bond; Optibond Solo Plus SE; Tyrian SPE/One-Step Plus; and UniFil Bond) and two water-storage times (one week and one year). Adhesives were applied according to the manufacturers' instructions. Z250 composite was applied into the molds to fill up the internal diameter volume of a Tygon tubing mold (1.0 mm high/0.7 mm internal diameter). Micro-shear bond strengths were determined using an apparatus attached to an Instron Universal Testing Machine (0.5 mm/min). Data were statistically analyzed using a two-way analysis of variance (ANOVA) and the Tukey's test (5%).


RESULTS
One year after water storage the dentin bond strength of all adhesive systems reduced significantly, except for One-Up Bond F.


CONCLUSIONS
Water-storage time decreased the bond strength for most dentin bonding agents tested.
Garcia
Rubens Nazareno
RN
Dental Materials Section, Dental School, UNIVALI, Itajaí, SC, Brazil. rubensgarcia@univali.br
de Goes
Mario Fernando
MF
Giannini
Marcelo
M
D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D004356:Drug Storage; D011897:Random Allocation; D019279:Resin Cements; D033081:Shear Strength; D013997:Time Factors; D014867:Water
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; D014867:Water