10-MDP Containing Cleaning Agent Restores Bond Strength to Contaminated Resin

Objectives: The aim of the present study was to investigate the efficacy of recently introduced 10-MDP containing cleaning agent in restoring the bond strength after blood and saliva contamination.
Methods: KATANA Avencia (Kuraray) and Tetric CAD (Ivoclar) blocks were used as substrates. The blocks were wet-polished with 600 grit sandpaper, sandblasted, and ultrasonically cleaned. After blood and saliva contamination, the specimens were divided into subgroups: control-no contamination, water rinsing, acid etching, Ivoclean (Ivoclar) or KATANA Cleaner application. Multilink Automix (Ivoclar) resin cement was then applied in increments of 2 mm and light cured. After 24 hours of water storage at 37°C, the blocks were sectioned to obtain bars of approximately 0,5 mm². Half of the specimens were tested immediately for µTBS and the other half was thermocycled (between 5-55°C with a dwell time of 30 seconds) for 5000 cycles and tested. Block surfaces were inspected with a scanning electron microscope (SEM). Three-way ANOVA was performed for µTBS values (α=0.05).
Results: In the KATANA Avencia group, the positive control subgroup obtained the highest value (56,01 MPa, SD:6,96) followed by Katana Cleaner and Ivoclean when immediately tested, with significant differences respect to the water rinsing (p<0.041) and acid etching (p<0.048) groups. After thermocycling, higher values were found in the KATANA cleaner (47,57 MPa, SD:8,15), but differences were not significant. In the Tetric CAD group, KATANA cleaner subgroup showed highest bond strengths (64,46 MPa SD: 10,92) at the initial test. After thermocycling, KATANA cleaner (58,66 MPa, SD: 9,93) gave the highest µTBS value. Significant differences between water rinsing group and the rest of subgroups (p<0.001), and between KATANA cleaner and the positive control group (p<0.006) were observed.
Conclusions: KATANA cleaner was able to restore the initial bond strength after contamination and maintained µTBS values better than the positive control subgroups after thermocycling.