Microleakage of all-ceramic crowns using self-etching resin luting agents.

Self-etching adhesive systems are a new generation of materials that possess acidic methacrylates that can generate self-adhesion. There is limited data reported on the marginal leakage of ceramic restorations bonded with self-etching adhesive materials. This study assessed and compared the amount of microleakage of bonded ceramic crowns using three different types of self-etching adhesive systems with and without a die spacer.

Resin bond strength and micromorphology of human teeth prepared with an Erbium:YAG laser.

Purpose: To evaluate the in vitro effect of the Er:YAG laser and high-speed rotary instrumentation on the bond strength of resin composite to human enamel and dentin, and determine which conditioner, either phosphoric acid or a self-etching primer, resulted in higher bond strengths with either of the surface treatments.

Methods: 48 third molars were used. Dentin and enamel specimens were sectioned and polished with 600-grit SiC paper and treated either with carbide bur or an Erbium:YAG laser and treated with one of three different conditions, acid-etch/bonding agent (Scotchbond Multi-Purpose Plus), no etching and same bonding agent, and an experimental self-etching primer (EXL 547).

Effect of hydrofluoric acid on repair bond strength of a laboratory composite.

Purpose: To evaluate the repair bond strength of a laboratory processed composite treated with hydrofluoric acid gels of different acid concentrations and for various etching times and repaired with a flowable composite.

Methods: 75 specimens of a laboratory composite (Targis) were prepared in a split metal mold and stored for 24 hours in an incubator at 37 degrees C and 100% relative humidity. The laboratory composite surfaces were then etched for 5, 10, 15, 30, and 60 seconds using three hydrofluoric acid concentrations (5%, 8%, and 9.

Bond strengths of repaired laboratory composites using three surface treatments and three primers.

Purpose: To determine the in vitro bond strength of three laboratory composites repaired with their corresponding direct repair composites using various combinations of surface treatments and primers.

Methods: The effects of three surface treatments (600-grit as a control, air abrasion with 50-microm Al2O3 particles and 8% hydrofluoric acid etching) and three primers with different formulations [Artglass Liquid (resin/silane), Sculpture Thinning Liquid (resin), and Targis Wetting Agent (silane)] were studied on three laboratory composites (Artglass, Targis and Sculpture). Specimens were stored for 24 hours at 37 degrees C and 100% relative humidity.