BOND STRENGTH OF 6 DENTINAL ADHESIVES

This study compared the shear bond strengths on dentine of five dentin e adhesives against Scotchbond 2 as a control. Dentine specimens from 225 extracted human permanent molar teeth were used in a matched-pair design, such that 45 tooth sides were treated along with the matching control for each of the five test materials. Shear bond strength testi ng was conducted 24 h after the completion of each specimen. Results s howed that mean force (MPa) for the materials were: XR Bond, 17.1 +/- 5.1; Scotchbond Multi-Purpose, 15.9 +/- 6.5, Syntac, 13.5 +/- 8.6; All -Bond 2, 6.2 +/- 4.1; Scotchbond 2 (control composite score), 4.9 +/- 3.0; Denthesive, 3.4 +/- 1.7. Matched pair t-test comparisons with Sco tchbond 2 control were: YR Bond, P = 0.0005; Scotchbond Multi-Purpose, P = 0.0005, Syntac, P = 0.0005; All-Bond 2, P = 0.0368; Denthesive, P = 0.005. Analysis of variance determined a statistically significant difference (P = 0.05) between the means of the bond strengths, which f ell into four groups: Group A, XR Bond and Scotchbond Multi-Purpose, G roup B, Syntac; Group C, All-Bond 2 and Scotchbond 2; Group D, Scotchb ond 2 and Denthesive. In Group C, there was no significant difference between Scotchbond 2 and All-Bond 2. In Group D there was no significa nt difference between Scotchbond 2 and Denthesive, however, there was significant difference between All-Bond 2 and Denthesive. It was concl uded that XR Bond and Scotchbond Multi-Purpose had significantly bette r shear bond strength than the other dentine adhesives.