Tensile bond strength of self-etching versus total-etching adhesive systems under different dentinal substrate conditions

• Published in: Brazilian oral research Vol. 21; no. 1; pp. 81 - 86
• Main Authors: Susin, Alexandre Henrique, Vasconcellos, Walison Arthuso, Saad, José Roberto Cury, Oliveira Junior, Osmir Batista de
• Format: Journal Article
• Language: English; Portuguese
• Published: Brazil Sociedade Brasileira de Pesquisa Odontológica - SBPqO 2007
• Subjects: Acid Etching, Dental; Adhesiveness; Analysis of Variance; Dental Bonding; Dental Etching - methods; Dentin - chemistry; Dentin - drug effects; Dentin Permeability; Dentin-Bonding Agents - chemistry; Dentin-Bonding Agents - standards; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Fibrillar Collagens - chemistry; Humans; Materials Testing; Methacrylates - chemistry; Molar, Third; Resin Cements - chemistry; Tensile Strength; Dentin-bonding agents; Permeabilidade da dentina; Dentin permeability; Resistência à tração; Adesivos dentinários; Tensile strength
• ISSN: 1806-8324; 1807-3107; 1807-3107; 1806-8324
• DOI: 10.1590/S1806-83242007000100014

The use of acid etchants to produce surface demineralization and collagen network exposure, allowing adhesive monomers interdiffusion and consequently the formation of a hybrid layer, has been considered the most efficient mechanism of dentin bonding. The aim of this study was to compare the tensile bond strength to dentin of three adhesive systems, two self-etching ones (Clearfil SE Bond--CSEB and One Up Bond F--OUBF) and one total-etching one (Single Bond--SB), under three dentinal substrate conditions (wet, dry and re-wet). Ninety human, freshly extracted third molars were sectioned at the occlusal surface to remove enamel and to form a flat dentin wall. The specimens were restored with composite resin (Filtek Z250) and submitted to tensile bond strength testing (TBS) in an MTS 810. The data were submitted to two-way ANOVA and Tukey's test (p = 0.05). Wet dentin presented the highest TBS values for SB and CSEB. Dry dentin and re-wet produced significantly lower TBS values when using SB. OUBF was not affected by the different conditions of the dentin substrate, producing similar TBS values regardless of the surface pretreatments.