ABSTRACT
AIM: Few studies compared the silorane and mechacrylate based resins bonded to enamel. The aim of this study was to evaluate the bonding durability of silorane and methacrylate-based resins to enamel. METHODS: Twenty seven molars were divided into G1 Clearfil SE Bond/Filtek Z350; G2 Adper Easy One/Filtek Z350; and G3 P90 Adhesive System/Filtek P90 groups. Following application of adhesive systems, blocks of composites were built, samples were stored in water (24 hours/37 ºC), sectioned (0.8 mm²) and tested in tensile (24 hours and 6 months). Fractures were observed (40×). Bond strength (in MPa) was analysed by MANOVA General Linear Model and Tukey's post-hoc test at 5%. The power test was calculated. The etching pattern was observed. RESULTS: There were differences for material (P=0.029), storage time (P=0.012) and their interaction (P=0.000). Similar bond strengths were found at 24 h for all. The bond strength of G1 decreased after 6 months. At 6 months, G2 showed higher bond strength than G1 and G3, that were similar. The power-test value was 0.87. Mixed fractures and enamel rods were observed. CONCLUSION: Bond strength varied over time depending on the restorative system.
Subject(s)
Dental Bonding , Dental Enamel , Methacrylates , Silorane Resins , Materials Testing , Time FactorsABSTRACT
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 (5°C, 20°C, 37°C, and 50°C) for 2 hours before application to demineralized dentin surfaces of 40 molars. Specimens were prepared for µTBS testing. Bonded sticks (0.8 mm(2)) 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 50°C. For SB, the µTBS values were similar for all temperatures. DC was higher at 50°C for PB. Higher NL and thicker AL were observed for both adhesives in the 5°C and 20°C groups compared to the 37°C and 50°C groups. The higher temperatures (37°C or 50°C) 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 37°C or 50°C and an acetone-based adhesive at 37°C to improve adhesive performance.
