Objectives: to determine the effect of aging on the shear-bond-strength of repaired fillings made by silorane- and methacrylate-based composites.
Methods: Fillings were prepared by polymerizing the composites - TetricEvoCeram/Ivoclar-Vivadent and Filtek Silorane/3MEspe - for 20s with the LED curing-unit Bluephase/Ivoclar-Vivadent in a shaped cavity (depth=2mm, diameter =6mm) of an acrylic cylinder. Following parameters were varied: Filling (S=Silorane; M=Methacrylate-composite), Repair (S=Silorane; M=Methacrylate-composite), Bonding-agent (SB=Siloranebond/3MEspe; HB=Heliobond/IvoclarVivadent; NB=none) and Aging of Filling and repaired samples (no aging; 1Week storage in aqua dest. at 37°C, and 1Month storage with additionally thermocycling with 5000cycles:5°C/55°C). Prior to bonding the filling was roughened (400-grit silicon carbide paper), cleaned (37% phosphoric acid), rinsed with water and air dried. The cylindrical repair (diameter=3mm) was applied in two 2mm thick increments, cured like the filling.
Specimens (n=10) were loaded in a universal testing machine (MCE2000ST, Quicktest PrüfpartnerGmbH, Germany) at a constant crosshead speed of 0.5mm/min.
Results: Data were analyzed by ANOVA, Tukey-HSD(α=0.05).
Filling | Repair | Bond | Aging-Filling | Aging-Repair | Strength/[MPa] |
S | S | SB | 1Week | no | 4.1a(2.1) |
S | S | SB | 1Month | no | 7.5ab(1.6) |
S | S | SB | no | no | 8.0ab(0.8) |
S | S | NB | no | no | 8.4abc(1.9) |
M | M | NB | no | no | 10.2abcd(2.4) |
M | M | HB | 1Month | no | 12.9abcde(4.7) |
M | M | HB | 1Week | no | 14.1bcdef(2.9) |
M | M | HB | no | no | 17.5cdefg(2.7) |
S | S | SB | 1Week | 1Week | 19.4defgh(5.8) |
S | S | SB | 1Month | 1Week | 19.9efgh(8.8) |
M | M | HB | 1Month | 1Week | 22.7fghi(6.0) |
S | S | SB | 1Month | 1Month | 24.3ghi(4.8) |
M | M | HB | 1Month | 1Month | 24.7ghi(6.0) |
M | M | HB | 1Week | 1Week | 26.7ghi(8.8) |
S | S | SB | 1Week | 1Month | 26.7ghi(5.7) |
M | M | HB | no | 1Month | 28.0hi(9.6) |
S | S | SB | no | 1Week | 29.8i(7.2) |
M | M | HB | 1Week | 1Month | 30.2i(3.6) |
S | S | SB | no | 1Month | 31.8i(7.0) |
M | M | HB | no | 1Week | 31.9i(10.7) |
Conclusion: Despite differences in the groups tested immediately after repair, the study exhibited no significant difference between Silorane and Methacrylate-groups after aging.