Author:

Abstract:

To evaluate bonding effectiveness of a new experimental composite cement to dentin in terms of microtensile bond strength (μTBS) after 1week (‘immediate’) and 6month (‘aged’) artificial aging. Flat ground dentin of 32 human molars was prepared using 600-grit SiC paper. Selfmade composite blocks (Clearfil AP-X,Kuraray Noritake) were bonded to flat dentin surfaces using 4 composite cements: Exp. HPC100 (Kuraray Noritake), Multilink (Ivoclar Vivadent), RelyX Unicem 2 and RelyX Ultimate (both 3M). The composite cements were not lightcured but solely allowed to selfcure. The μTBS was measured using a LRX testing device (LRX, Lloyd) after 1week and 6month water storage. Bond strength data were analyzed by a Kruskal-Wallis test, followed by a posthoc Nemenyi multiple comparisons analysis (p<0.05). The failure mode of representative fractured specimens was analyzed using scanning electron microscopy. The significantly highest μTBS was measured for the exp. HPC100 composite cement, both after 1week and 6-month water storage. No difference in μTBS was found between RelyX Unicem and RelyX Ultimate for both storage periods. The ‘immediate’ and ‘aged’ μTBS was lowest for Multilink. As compared to the commercially available composite cements tested, the bonding effectiveness to dentin of the new exp. HPC100 composite cement, being the experimental precursor of Panavia V5 that was recently launched by Kuraray Noritake, was significantly higher and appeared resistant against 6-month water storage aging, this when all composite cements were solely selfcured.