Loading Effect on µTBS of All-In-One Adhesives – Indirect Bonding

Methods: Dentin surfaces of sound human third molars were exposed using #600 SiC paper, treated with four all-in-one adhesives: Danville Experimental (Danville Materials); G Bond (GC); TriS Bond (Kuraray); AdheseOne (Vivadent) and a total etch adhesive Prelude (Danville). Dual-curable resin (Multicore; Vivadent) build ups were created with or without use of 'Prelude Link', forming two groups. Two subgroups were created from each group and the first subgroup was subjected to mechanical fatique loading (5x10⁴; 50N at 0.2 Hz). After storage at 37°C for 1 week, µTBS test was performed, data was calculated as MPa and statistically analyzed using Multivariate Analysis of Variance. Multiple comparisons were done using t-test.

Results: Pre-test failures were observed and no data could be obtained from the groups without Link except when using Prelude Total Etch; µTBS with/without loading was (Mean±SD;MPa): 37.37±4.58/45.81±2.40. µTBS of tested materials with Link and with/without loading were as follows (Mean±SD;MPa): Danville Experimental: 11.58±1.26/18.72±2.95; GBond: 20.24±2.14/23.44±1.95; TriS Bond: 22.56±3.12/26.14±2.35; AdheseOne: 8.79±3.04/18.76±4.62.

Conclusion: Prelude Link significantly increased µTBS of all-in-one adhesives to dentin (p=0.000). Mechanical loading significantly decreased µTBS of the tested materials (p=0.000). G Bond and TriS Bond showed significantly higher bond strength values than Danville Experimental and AdheseOne(p<0.01).