Effect of disinfectant application methods on the bond strength of composite to dentin

Abstract

The use of cavity disinfectants with composite resins has raised important questions regarding their potential adverse effects on bond strength. The purpose of this study was to evaluate the effect of cavity disinfection on the bond strength of composite resin to dentin. Buccal surfaces of 64 caries-free extracted human third molars were ground flat by diamond flat-end cylinder bur, polished with a series of silicon carbide abrasive papers and mounted in autopolymerizing acrylic resin. They were randomly distributed into four groups (of 16). In group 1 (control group), dentin surfaces were treated with 35% phosphoric acid, Permagen primer and Permagen bonding resin and no disinfectant was used. In group 2, cavity disinfectant was applied and acid etching, priming and bonding procedures were performed as in group 1. In group 3, cavity disinfectant was applied after acid etching. In group 4, cavity disinfectant was applied as in group 3, but it was rinsed off before priming and bonding procedures. Then a Teflon mould 3 mm thick and 4 mm in diameter was attached to the dentin surfaces, filled with composite resin and light polymerized. After the specimens had been thermocycled, shear bond strengths were determined. Application of the disinfectant before or after acid etching significantly reduced the shear bond strength of composite to dentin (P<0.05). Rinsing off the cavity disinfectant before the bonding procedure did not affect the bond strength (P>0.05). The use of cavity disinfectant with composite resin restorations can influence the dentin bond strength.

Effect of chlorhexidine on the shear bond strength of self-etch adhesives to dentin

“…However, the results of this study are not consistent with the results of other studies conducted on total-etch adhesives (Cao et al, 1995;Gürgan et al, 1999;Meiers and Shook, 1996). In the earlier mentioned studies, chlorhexidine affected the bond strength adversely.…”

Effect of 2% chlorhexidine application on microtensile bond strength of resin composite to dentin using one-step self-etch adhesives

“…Previous studies 4,5,7,10 reported the association of chlorhexidine application and bond strength to be a contentious issue. There are studies that insist that the application of chlorhexidine affects the bond strength.…”

“…Gurgan et al reported that the use of 2% chlorhexidine before or after acid etching may decrease the bond strength by altering the ability of the hydrophilic resin to seal dentin. 7 Meiers and Shook indicated that bonding with Tenure (two-step etch-and-rinse adhesive) was unaffected by the application of chlorhexidine, whereas bonding with Syntac (two-step self-etch adhesive) was affected. 10 However, Perdigão et al stated that chlorhexidine has strong affinity to the tooth surfaces, which is increased by acid-etching.…”

“…Previous studies [4][5][6][7][8][9][10] were carried out using etch-and-rinse and self-etch adhesives with conflicting results being reported. However, few studies have examined the effect of chlorhexidine application on the microtensile bond strength of resin composites to dentin using one-step self-etch adhesives.…”

Effect of Endodontic Irrigating Solutions on the Micro Push-out Bond Strength of a Fibre Glass Dowel

“…The use of disinfecting solutions prior to bonding procedures can interfere with the adhesion process, altering the properties of some hydrophilic resins (1,2). Residues of these substances may also impede the deep penetration of the bonding agent and its intimate contact with dentin, also affecting the adhesion process (1).…”