| THE BULLETIN OF TOKYO DENTAL COLLEGE | |
| Vol. 50 No. 1 February 2009 | |
| ISSN: 0040-8891 UBIC: 66 | |
| Abstract | |
| This aim of this study was to determine the effect of type of bur and resin-coating material on microtensile bond strength (µTBS) of indirect
composite to dentin. Dentin surfaces were first ground with two types of diamond bur and resin-coated using UniFil Bond (UB) or Adper Single Bond (SB), and then bonded
to a resin composite disc for indirect restoration with adhesive resin cement. After storage for 24 hr in distilled water at 37°C, µTBS was measured (crosshead speed
1 mm/min). When UB was applied to dentin prepared using the regular-grit diamond bur, µTBS was significantly lower than that in dentin prepared using the superfine-grit
bur. In contrast, no significant difference was found between regular-grit and superfine-grit bur with SB. However, more than half of the superfine-grit specimens failed
before µTBS testing. These results indicate that selection of bur type is important in improving the bond strength of adhesive resin cement between indirect resin composite
and resin-coated dentin.
Key words: Diamond bur roughness-Resin coating-Microtensile bond strength- Indirect composite restoration. |
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