Abstract
Purpose: The aim of this study was to determine the influence of atmospheric pressure plasma (APP) treatment and water storage onmicrotensile dentin bond strength (BS) of two adhesive systems. Methods and materials: Twenty-eight third human molar were sectioned to remove the enamel occlusal surface and grounded (600-grit SiC) to expose a flat dentin surface. Teeth were randomly divided into four groups (n=7), following the application or not of APP for 30 s after etchingwith phosphoric acid and two adhesives (XP Bond, Dentsply and Optibond FL, Kerr). After the composite resin build-up, teethwere sectioned perpendicular to the bonded interface to obtain beams specimens. The specimens were tested after 24h and one year of water storage until failure. Bond strength data were analyzed by three-way ANOVA and Tukey post-hoc test (a=0.05). Results: BSmeans for XP Bondwere (inMPa): Control (24h): 45.1± 4.6; Control (1 year): 42.2± 3.4, APP (24h): 59.0± 10.2; APP (1 year): 47.1± 13.2 and BS means for Optibond FL were: Control (24h): 68.3± 7.7; Control (1 year): 56.4± 6.7, APP (24h): 57.4± 13.7; APP (1 year): 53.5± 10.9. Conclusion:APP application decreased the BS for Optibond FL, while for XP Bond the BS increased. However, this increasing was not stable after one year of water storage. The effects of APP and long-term storage on dentin BS were productdependent.
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