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The Extent to which Resin can Infiltrate Dentin by Acetone-based Adhesives

¹ Department of Operative Dentistry and Endodontics, Iwate Medical University, School of Dentistry, 1-3-27, Chuo-douri, Morioka 020-8505, Iwate, Japan;
² Department of Dental Materials Science, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu 061-0293, Hokkaido, Japan;
³ Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan; and
⁴ Division of Cariology and Endodontology, Hokkaido University, Graduate School of Dental Medicine;

*corresponding author, masanori-h{at}mue.biglobe.ne.jp

The combined methodologies of fractography and laser-Raman spectroscopic analysis were used for evaluation of the resin-dentin bonds made with wet and dry bonding. Resin-dentin-bonded beams were produced by means of 2 acetone-based adhesives (One-Step and Prime & Bond NT). The micro-tensile bond test was conducted, and the fractured surfaces of all specimens were examined by SEM and an image analyzer. The amount of resin infiltration within the hybrid layer was quantified by means of a laser-Raman spectroscope. In Raman analysis, the amount of resin impregnation within the hybrid layer of the dry bonding was found to be significantly lower (approximately 50%) than that in the wet one. Under fractographic analysis, a correlation was found between the bond strength and the failure mode. Based on those findings, it was suggested that the integrity between the bonding resin and the top of the hybrid layer played a major role in bond strength.

KEY WORDS: laser-Raman analysis • fractography • microtensile bond test • wet bonding technique

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