Effect of different functional monomers on hydrolytic stability of self-etching priming systems bonded to dentin

Abstract

The aim of this study was to characterize the adhesive performance of three functional monomers, 10-MDP, 4-MET, and phenyl-P, with hydroxyapatite, and to determine the hydrolytic stability of 3 self-etch adhesives, Clearfil MegaBond (CMB), Unifil Bond (UFB) or Clearfil Liner Bond II (LBII). Among these monomers, 10-MDP appeared not only to interact most intensively with hydroxyapatite; its bond with calcium appeared also most hydrolytically stable. Even after 100000 cycles, the 10-MDP-based adhesive (CMB) revealed an micro-TBS of 35.3 MPa, which was not significantly different from the control micro-TBS (40.8 MPa). The 4-MET-based adhesive (UFB) showed statistically the same micro-TBS as the control (37.9 MPa) up to 50000 cycles, but after 100000 cycles its micro-TBS was significantly lower (22.5 MPa). For the phenyl-P-based adhesive (LBII), the micro-TBS decreased significantly after 30000 cycles from the control value (44.7 MPa) towards 23.2 MPa after 100000 cycles.