0324 Effect of Metal Primers on Cement Bonds to Fully-Sintered Zirconia
G.M. DIAS DE SOUZA1, N. SILVA2, M. GOES3, E. REKOW2, and V.P. THOMPSON4, 1New York University, State University of Campinas, USA, 2New York University, USA, 3State University of Campinas, Piracicaba, Brazil, 4New York University College of Dentistry, USA

Objective: To test the hypothesis that as an alternative to particle abrasion of fully-sintered zirconia, metal primer application prior to cementation will provide improved bond strength. Methods: Half-circled shaped (24 mm diameter X 0.4 mm thick) Yttria-stabilized tetragonal polycrystalline zirconia (Y-TZP, LAVA Frame) samples were bonded to 4mm thick Z-100 composite samples. Before the cementation, the ceramic was ground (600 grit) and then treated either with Alloy Primer (Ap – MDP/VBATDT containing monomer) or Epiguard (E – MDP containing monomer) prior to luting with RelyX Unicem (RU) or Panavia 21 (Pa). RU and Pa control groups did not receive any primer treatment before cementation. For comparison YTZP samples were particle abraded (50 µm alumina), silanized, and bonded with the Variolink II system (SV). After 24 hours, samples (n=3) were cross-sectioned to obtain beams (30 per sample) that were tested using microtensile technique (1.0mm/min) at two different times: 72 hours and 60 days + thermocycling (TC = 5000 cycles 5-55 C). Values were statistically analyzed by One-way ANOVA and Tukey test (a=0.05). Results:  Microtensile bond strengths are shown below.

Group

MTB (72 hrs)

MTB (60 days + TC)

Mean±SD (α=0.05)

Mean±SD (α=0.05)

ApRU

28.53±2.03       A

      31.69±4.09   a

EPa

23.95±2.28      AB

        2.76±2.23     b

ApPa

19.92±2.48      BC

        6.94±1.51     b

Pa

17.16±0.60       C

        1.88±2.72     b

ERU

16.43±1.59       C

        0.10±0.18     b

RU

10.79±2.35       D

        2.85±4.05     b

SV

4.89±1.75        E

        5.06±3.53     b

 

Conclusion: Metal primers were selectively effect in significantly increasing the 72 hr bonds of Unicem and Panavia to YTZP.  Alloy Primer with RelyX Unicem was the only combination which maintained bond strength after aging.

Seq #58 - Adhesives, Bonding, Surface Treatments, Physical Properties
2:00 PM-3:00 PM, Thursday, 9 March 2006 Dolphin Hotel Pacific Hall

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