BOND STRENGTH TO DENTIN WITH ARTIFICIAL CARIOUS LESIONS - INFLUENCE OF CARIES DETECTING DYE

Purpose: To evaluate the influence of dyes for caries detection on ten sile bond strength of adhesive materials to artificial carious dentin. Materials and Methods: Buccal and lingual enamel of human molars were removed leaving intact dentin surfaces. The entire surface of each sp ecimen was covered with nail varnish, keeping a window area of 4 x 4 m m. Artificial carious lesions were induced with acidified gel. Three d yes (0.5% basic fuchsin; Caries Finder and Cari-D-Tect) were used acco rding to manufacturers' recommendations. Specimens were etched with 35 % phosphoric acid for 20 s, washed and dried, leaving a wet dentin sur face. The adhesive system (Prime & Bond 2.0) was applied in two layers and light-cured. Restorative materials (TPH Spectrum, Dyract, Advance ) were bonded using a 3-mm diameter inverted-cone mold. Control groups were made without dye. Eight samples were tested for each group. Afte r 24 hrs of storage in distilled water, the samples were debonded usin g a testing machine at 0.5 mm/min crosshead speed. Results: ANOVA and Tukey-Kramer test showed that TPH Spectrum (0.73 MPa) and Dyract (0.74 MPa) had similar bond strengths, and both were higher than Advance (0 .0 MPa), which was statistically different (P< 0.01). The use of the d yes did not cause any changes in tensile bond strength for any tested materials.