Abstract
BackgroundTo assess the immediate bond strength of a dual-cure adhesive resin cement to the hybridized dentin with different bonding systems.Material and MethodsFifty-six healthy human molars were randomly divided into 7 groups (n=8). After 3 longitudinal sections, the central cuts were included in PVC matrix and were submitted to dentin hybridization according to the groups: G1 - etch & rinse system with 3-step (Apder™ Scotchbond™ Multi-Purpose, 3M ESPE), G2 - etch & rinse system with 3-step (Optibond™ FL, Kerr), G3 - etch & rinse system with 3-step (All-Bond 3®, Bisco), G4 - etch & rinse simplified system (Adper™ Single Bond 2, 3M ESPE), G5 - self-etching system with one step (Bond Force, Tokuyama), G6 - universal system in moist dentin (Single Bond Universal, 3M ESPE), G7 - universal system in dry dentin (Single Bond Universal, 3M ESPE). Then all groups received the cementing of a self-adhesive resin cement cylinder (Duo-link, Bisco) made from a polypropylene matrix. In the evaluation of bond strength, the samples were subjected to the microshear test and evaluated according to the fracture pattern by optical microscopy.ResultsThe Kruskal-Wallis test suggests a statistically significant difference between groups (p=0,039), and Tukey for multiple comparisons, indicating a statistically significant difference between G3 and G4 (p<0.05). It was verified high prevalence of adhesive failures, followed by mixed failure and cohesive in dentin.ConclusionsThe technique and the system used to dentin hybridization are able to affect the immediate bond strength of resin cement dual adhesive. Key words:Adhesion, adhesive resin cement, adhesive systems, microshear.
Highlights
The increase in the demand for satisfactory and biomechanically aesthetic restorations, whether direct or indirect, has led to research and development of materials that naturally reproduce shape, color, texture, and function of the lost tooth structure
The specimens were divided into seven groups (n=8), according to the type of adhesive system used: G1 - total acid etching with 37% phosphoric acid (Dentsply, Konstanz, Germany), associated with a three-step adhesive system
MN, USA); G2 - total acid etching with 37% phosphoric acid (Dentisply®, Konstanz, Germany), associated with a three-step adhesive system (OptiBondTM FL, Kerr, Orange, CA, USA); G3 – total acid etching associated with a three-step system (All-Bond 3®, Bisco, Schaumburg, IL, USA); G4 - total acid etching with 37% phosphoric acid (Dentisply®, Konstanz, Germany), associated with a simplified two-step system
Summary
The increase in the demand for satisfactory and biomechanically aesthetic restorations, whether direct or indirect, has led to research and development of materials that naturally reproduce shape, color, texture, and function of the lost tooth structure. The role of adhesive systems is to create bonding mechanisms between the restorative material, the resin cement, and the substrate of the tooth surface These mechanisms require surface etching (enamel and/or dentin), application of a hydrophilic primer that increases surface wettability and adhesive component, which is a fluid resin that binds the conditioned tooth surface to direct or indirect restorations [3,5]. The form and bond strength of adhesive systems on dentin and enamel behave differently Because of this behavior, numerous studies have been conducted over time, which resulted in different materials and techniques for the conditioning and treatment of each surface [2,3]. Conclusions: The technique and the system used to dentin hybridization are able to affect the immediate bond strength of resin cement dual adhesive
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