Bond Strength of Luting Cements to Turkom-Cera All-Ceramic Material

Objectives: The aim of this study was to evaluate the shear bond strength (SBS) of Zinc phosphate cement Elite, glass ionomer cement Fuji I, resin modified glass ionomer cement Fuji Plus (GC Corporation, Tokyo, Japan) and resin luting cement Panavia-F (Kuraray Medical Inc., Okayama, Japan) to Turkom-Cera (Turkom-Ceramic (M) Sdn. Bhd., Kuala Lumpur, Malaysia) all-ceramic material.

Methods: Turkom-Cera was used to form discs 10mm in diameter and 2mm in thickness (n=40). The ceramic discs were wet ground to ensure flat parallel surfaces, air-particle abraded with 50-μm Al₂O₃ particles and randomly divided into four groups (n=10) that were determined by the type of cement used. The luting cements were bonded, as per manufacturer instructions to Turkom-Cera discs using a bonding jig recommended by ISO TS 11405/2003. Then the bonded specimens were stored in distilled water for 24 hours at 37ºC. SBSs were determined using the universal testing machine (Instron) at 0.5mm/min crosshead speed and then calculated to MPa.

Results: Mean (MPa) and standard deviation are shown below:    

The data were analyzed by the Levene's test and Dunnett's T3 post-hoc test at a pre-set significance level of 5 % because of unequal group variances (P<0.001). There was statistically significant difference between the four luting cements tested. The mean SBS of Panavia-F was significantly higher than Elite, Fuji I and Fuji Plus (p<.05).

Conclusion: The results of this study indicate that selection of the appropriate luting cement is a key factor for achieving a strong bond to Turkom-Cera all-ceramic material. The phosphate-containing resin cement Panavia-F exhibited SBS value significantly higher than all materials tested.

This study was supported by a grant (P0197/2006C); University of Malaya, Kuala Lumpur, Malaysia.