• Putsadee Srisomboonkamon D.D.S.
• Prarom Salimee, D.D.S., Ph.D.

Background/Objective: This study aimed to evaluate the microtensile bond strength (MTBS) of three
zirconia ceramics from different manufacturers bonded to resin composite using three different
resin cements.

Materials and methods: Three fully-sintered zirconia ceramic blocks (5x5x10 mm) from Katana
(Nuvodent, Japan), Lava (3M ESPE, Germany) and Cercon (Degudent, Germany) were fabricated
and bonded to resin composite blocks (Filtek Z250, 3M ESPE, USA) with the same size using one
of the three resin cements : Panavia F 2.0 (Kuraray, USA), Superbond C&B (Sun Medical, Japan) and
RelyX Unicem (3M ESPE, USA). After 24 h, each block was cut under water coolant to produce
microbar specimens, with bonding area 1 ± 0.1 mm2. The MTBS was tested with universal testing
machine at a crosshead speed of 0.5 mm/min. The interface failures were examined using a scanning
electron microscope. Two-way ANOVA and Tukeyûs tests were analyzed at 95% confidential interval.

Results: The MTBS value range from 43.3 - 53.9 N/mm2. Lava/Superbond showed the highest
value, while Cercon/Panavia showed the lowest value. Statistical analysis showed that types of
zirconium-oxide ceramic (P=0.043) and types of resin cement (P=0.047) had an effect on MTBS,
while the interaction between zirconia ceramic and types of resin cement (P=0.056) was not
significant. Panavia F 2.0 and RelyX Unicem demonstrated resin cement cohesive failure. Superbond
C&B showed mixed of adhesive and cohesive failure. No adhesive failure was observed.

Conclusion: The MTBS of zirconia ceramic bond to composite using resin cement depended on brands

of zirconia and types of resin cement.

(CU Dent J. 2019;42:11-22)