Evaluation of the effect of four self‐etching adhesives ondentin permeability

Objective: The aim of this study was to evaluate the effect of two two‐step and two single‐step self‐etching adhesives on dentin permeability using a computerized fluid filtration (CFF) test method. Methodology: Forty recently extracted sound human molar teeth were sectioned at the mid level of the crown to obtain dentin discs of 1 ± 0.2 mm. A total of 40 discs were obtained and randomly divided into four groups ( n = 10). The permeability of the discs was measured using the CFF test method before and after application of the following self‐etching adhesives: Hybrid Bond, G‐Bond, AdheSE, and Protect Bond. Fluid movement measurements were made at 2‐min intervals for 8 min, and a mean of the values obtained was calculated for each specimen. Results: The in vitro fluid conductance of dentin discs treated with Hybrid Bond and AdheSE were lower than the dentin discs treated with G‐Bond and Protect Bond ( p < 0.05). Conclusion: 1‐Treating dentin discs with self‐etching adhesives caused significant reduction of dentin permeability. 2‐All self‐etching adhesives allowed diffusion of distilled water. However, AdheSE and Hybrid Bond showed the lowest permeability. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009