One‐Year Tensile Bond Strengths of Two Self‐Etching Primers to Bovine Enamel

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<jats:sec><jats:title>ABSTRACT</jats:title></jats:sec><jats:sec><jats:title>Purpose::</jats:title><jats:p>The purpose of this study was to evaluate the enamel bond strengths of two self‐etching primer systems and a total‐etch self‐priming adhesive system at 24 hours and after a 1‐year period of storage in water at 37°C.</jats:p></jats:sec><jats:sec><jats:title>Materials and Methods:</jats:title><jats:p>An experimental self‐etching priming system (ABF, Kuraray Medical, Tokyo, Japan), Clearfil™ SE Bond (Kuraray), and One‐Step® (Bisco, Schaumburg, IL, USA) were used as the adhesive systems. Eleven bovine incisors stored frozen were ground with 600‐grit SiC paper, bonded as recommended by the manufacturers, and restored with Clearfil™ AP‐X (Kuraray) or Renew® (Bisco). After 24 hours in water at 37°C, the teeth were sectioned into 0.7 mm‐thick slabs that were trimmed and tested for microtensile bond strength using a tabletop tester (EZ test, Shimadzu, Kyoto, Japan) at a crosshead speed of 1 mm/min. Alternate slices were either tested at 24 hours or kept in an incubator at 37°C for 1 year prior to testing. The data were analyzed using paired <jats:italic>t</jats:italic>‐test (<jats:italic>p</jats:italic> < .05).</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>Differences in bond strengths were not significant at 24 hours. After 1 year, ABF and Clearfil<jats:sup>k</jats:sup> SE Bond had significantly higher mean bond strengths than at 24 hours (<jats:italic>p</jats:italic> < .001).</jats:p><jats:p><jats:bold>Conclusions: </jats:bold> Enamel bond strengths of the total‐etch two‐step adhesive remained stable, and the bond strengths of the two self‐etching primer systems increased with time.</jats:p></jats:sec>

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