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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

Spring 2002
Volume 4 , Issue 1



Pages: 31-39
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The in Vitro Dentin Bond Strengths of Two Adhesive Systems in Class I Cavities of Human Molars

Nikaido, Toru/Kunzelmann, Karl-Heinz/Ogata, Miwako/Harada, Naoko/Yamaguchi, Saori/Cox, Charles F./Hickel, Reinhard/Tagami, Junji

The purpose of this study was to evaluate the in vitro dentin bond strengths of two dentin bonding systems in Class I cavities following fatigue load cycling (FLC) with thermal cycling (TC). Class I cavities were prepared in 12 human molars and restored with either Clearfil SE Bond (SE) and Clearfil AP-X resin composite (AP-X) or Single Bond (SB)/AP-X according to the manufacturers’ instructions. After water storage for 1 week, untreated controls and test samples were subjected to 50,000 FLC with TC from 5C to 55C for 625 cycles and stored in water for 1 week. Microtensile bond strength (MTBS) tests were measured on the floor of the cavities at a crosshead speed of 1 mm/min. Data were statistically analyzed using one- and two-way ANOVA and Fisher’s PLSD test at a 5% level of significance. The MPa results were: SE 30.5 12.8 (control) and 23.2 10.8 (50,000 FLC); SB 5.1 9.2 (control) and 4.7 5.7 (50,000 FLC). Bond strengths were not statistically significantly affected by FLC (p > 0.05); however, they were influenced by the bonding system (p < 0.05). The MTBS of SE was significantly higher than that of SB (p < 0.05) under FLC and TC test conditions. Over half of the SB specimens debonded during sample preparation, showing blister-like structures, suggesting that an over-wet phenomenon occurred on the cavity floor. SE produced excellent dentin bonds that were much stronger than those produced by SB, which was shown to be a technique-sensitive bonding system.

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