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Aim: Adhesion can be influenced by adhesives spreading. Bothslow and fast spreading can be deleterious as they canrespectively lead adhesive to partially cover the demineralizedsubstrate or to accumulate on line angles of cavity preparations.Since brands of dentin bonding systems present distinctcompositions and thus different behaviors its important to knowhow fast they spread over dental substrates. The purpose is todetermine the influence of surface inclinations on the spreadingvelocity of simplified adhesive systems.Materials and methods: Spreading velocities of adhesivesystems (Adper Single Bond, Adper Single Bond Plus, AdperPrompt, Prime and Bond 2.1, Prime and Bond NT, One-UpBond F) were measured on glass slide surfaces inclined at 45°and 90°. The spreading of each drop was observed at a 30seconds interval. Data was recorded and the values obtainedat 30 seconds were analyzed by two-way ANOVA and Student-Newman-Keuls (SNK) tests (α = 0.05).Results: The type of adhesive system and the angle ofinclination influenced spreading velocity (p < 0.05). Adper SingleBond Plus and One-Up Bond F exhibited the lowest spreadingvelocities of all materials tested (p < 0.01). Adhesives spreadingwere similar on surfaces inclined 45° and 90°, except for AdperSingle Bond Plus which spread faster and Prime and Bond NTthat spread slower on 90° angled surfaces (p < 0.01).Conclusion: The materials tested showed complex spreadingpatterns since the spreading velocities changed only whensome specific material/inclination combinations where tested.

Influence of Surface Inclination on the Spreading Velocity of Simplified Adhesive Systems