Innovations in bonding to zirconia based ceramics: Part III. Phosphate monomer resin cements.
OBJECTIVE
To compare the bond strength values and the ranking order of three phosphate monomer containing resin cements using microtensile (microTBS) and microshear (microSBS) bond strength tests.


METHODS
Zirconia discs (Procera Zirconia) were bonded to resin composite discs (Filtek Z250) using three different cements (Panavia F 2.0, RelyX UniCem, and Multilink). Two bond strength tests were used to determine zirconia resin bond strength; microtensile bond strength test (microTBS) and microshear bond strength test (microSBS). Ten specimens were tested for each group (n=10). Two-way analysis of variance (ANOVA) was used to analyze the data (alpha=0.05).


RESULTS
There were statistical significant differences in bond strength values and in the ranking order obtained using the two test methods. microTBS reported significant differences in bond strength values, whereas microSBS failed to detect such effect. Both Multilink and Panavia demonstrated basically cohesive failure in the resin cement while RelyX UniCem demonstrated interfacial failure.


CONCLUSIONS
Based on the findings of this study, the data obtained using either microTBS or microSBS could not be directly compared. microTBS was more sensitive to material differences compared to microSBS which failed to detect such differences.
Mirmohammadi
Hesam
H
Department of Dental Materials Science, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Free University, Amsterdam, Noord Holand, The Netherlands. hmirmoha@acta.nl
Aboushelib
Moustafa N M
MN
Salameh
Ziad
Z
Feilzer
Albert J
AJ
Kleverlaan
Cornelis J
CJ
D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D008422:Materials Testing; D010710:Phosphates / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013499:Surface Properties; D013718:Tensile Strength; D015040:Zirconium
D003188:Composite Resins; C438843:Panavia-Fluoro; D010710:Phosphates; C483701:Rely X Unicem; D019279:Resin Cements; C502351:multilink adhesive system; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide