• Chalermporn Pongsirisopaporn D.D.S.
• Sirivimol Srisawasdi D.D.S., M.S., Ph.D.

Objective To compare the durability of microtensile bond strength of reparing ceramics after
different surface treatments with resin composite.

Materials and methods Eight IPS Empress CAD ceramic blocks were cut into square shape and
divided into 4 groups according to the surface treatments: hydrofluoric acid, hydrofluoric acid +
silanization, sandblast and sandblast + silanization. Specimens were applied with bonding system and
resin composite. Half of each group were subjected to thermocycling and cyclic loading. All groups
were sliced into 10 specimens, 1 mm thickness and microtensile bond strength was recorded using
universal testing machine. Data were analyzed with three-way ANOVA and Tukey test (p < 0.05).

Results Microtensile bond strength of all aging groups was significantly lower than non-aging groups
either using any type of surface treatment and silanization or not. When compared in aging groups,
group that was prepared with sandblast + silanization had lowest microtensile bond strength and group
that was prepared with sandblast only had highest microtensile bond strength.

Conclusion Microtensile bond strength of ceramic repaired with resin composite was decreased after
aging process, but surface treatment with silane and type of surface treatment (hydrofluoric acid or
sandblasting with aluminum oxide) did not affect it.

(CU Dent J. 2013;36:37-48)