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Adhesive temperature: Effects on adhesive properties and resin-dentin bond strength

Abstract:

Objectives: To evaluate the effect of adhesive temperature on the resin-dentin bond strength (μTBS), nanoleakage (NL), adhesive layer thickness (AL), and degree of conversion (DC) of ethanol/water- (SB) and acetone-based (PB) etch-and-rinse adhesive systems. Methods: The bottles of the two adhesives were kept at each temperature (58°C, 208°C, 378°C, and 508°C) for 2 hours before application to demineralized dentin surfaces of 40 molars. Specimens were prepared for μTBS testing. Bonded sticks (0.8 mm2) were tested under tension (0.5 mm/min). Three bonded sticks from each tooth were immersed in silver nitrate and analyzed by scanning electron microscopy. The DC of the adhesives was evaluated by Fourier transformed infrared spectroscopy. Results: Lower μTBS was observed for PB at 508°C. For SB, the μTBS values were similar for all temperatures. DC was higher at 508°C for PB. Higher NL and thicker AL were observed for both adhesives in the 58°C and 208C groups compared to the 378°C and 508°C groups. The higher temperatures (378C or 508C) reduced the number of pores within the adhesive layer of both adhesive systems. Conclusions: It could be useful to use an ethanol/water-based adhesive at 378°C or 508°C and an acetone-based adhesive at 378°C to improve adhesive performance. © 2011 Operative Dentistry, Inc.