Objectives: The goal of this study was to compare the enamel and dentin shear bond strengths of a cationic curing SiloraneTM based filling material with a polymerization shrinkage of less than 1% and the appropriate self-etching adhesive with conventional methacrylate systems.
Methods: Bovine incisors were embedded in cold-cure acrylic resin. The labial surface of each tooth was ground to expose enamel or dentin. A cylindrical composite button (4.67 mm diameter, 2 mm height) was cured on the tooth surfaces treated with the respective adhesive (Silorane / H-Bond, SIL / HB, 3M ESPE; Filtek Z250 / Adper Prompt L-Pop, Z250 / APLP, 3M ESPE; Spectrum TPH / Xeno III, TPH / Xeno, Dentsply; Venus / iBond, VEN / IB, Heraeus-Kulzer) according to the manufacturers’ instructions (n=5). After 24 h storage in water at 37°C, the specimens were tested in shear mode using a Zwick Z010 universal testing machine (crosshead speed 2 mm / min).
Results: The following table shows the shear bond strengths in MPa. The standard deviations are given in parentheses. All data were analyzed by ANOVA and multiple comparisons using Fisher’s LSD procedure (p<0.05). Means with the same letters are statistically the same.
|
Material |
SIL / HB |
Z250 / APLP |
TPH / Xeno |
VEN / IB |
|
Enamel |
19.9 (2.5) a |
16.3 (3.0) a |
10.0 (2.1) b |
16.5 (3.7) a |
|
Dentin |
17.1 (2.4) a |
16.0 (3.4) a |
11.3 (5.9) b |
7.7 (3.5) b |
Conclusions: The Silorane system provided significantly higher bond strength to both enamel and dentin than Spectrum TPH / Xeno III to enamel and dentin, and Venus / iBond to dentin. The values measured for the Silorane system on enamel and dentin were statistically the same as those obtained for Z250 / Adper Prompt L-Pop on enamel and dentin, and for Venus / iBond on enamel.