Evaluation of bond strength of various margin ceramics to a zirconia ceramic

Çömlekoğlu, M. Erhan; Dündar, Mine; Özcan, Mutlu; Güngör, M. Ali; Gökçe, Bülent; Artunç, Celal

doi:10.1016/j.jdent.2008.05.019

« Previous Next »Journal of Dentistry
Volume 36, Issue 10 , Pages 822-827, October 2008

Evaluation of bond strength of various margin ceramics to a zirconia ceramic

M. Erhan Çömlekoğlu
- Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey
- Corresponding author at: Ege University, School of Dentistry, Department of Prosthodontics, Bornova 35100, Izmir, Turkey. Tel.: +90 2323880327; fax: +90 2323880325.
Mine Dündar
- Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey
Mutlu Özcan
- University Medical Center Groningen, University of Groningen, Academic Center for Oral Health, Clinical Dental Biomaterials, Groningen, The Netherlands
M. Ali Güngör
- Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey
Bülent Gökçe
- Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey
Celal Artunç
- Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey

Received 13 March 2008; received in revised form 30 May 2008; accepted 31 May 2008.

Abstract

Objective

This study evaluated the bond strengths of four different margin ceramics based on fluoroapatite and feldspath to a zirconia ceramic.

Methods

Zirconia cores (Zirconzahn) (N=28, n=7/margin ceramic group) were fabricated according to the manufacturers’ instructions (diameter: 4mm; thickness: 2mm) and ultrasonically cleaned. Four different margin ceramics (thickness: 5mm) (Cerabien Zr, Noritake; Ceramco PFZ, Ceramco; e.max, Ivoclar Vivadent and Triceram, Dentaurum) were vibrated and condensed in a stainless steel mould and fired onto their zirconia cores. After trying the specimens in the mould for minor adjustments, they were again ultrasonically cleaned and embedded in PMMA. The specimens were stored in distilled water at 37°C for 1 week and shear bond strength (MPa±S.D.) tests were performed in a universal testing machine (crosshead speed: 0.5mm/min). Failure modes were recorded under SEM.

Results

Significant effect of margin ceramic types were found on the bond strength values (P<0.05). The mean bond strength values of Ceramco margin ceramic to zirconia was significantly lower (25.4±4.5MPa) (P<0.05) than those of Cerabien (31.6±6.4MPa), e.max (35.9±8.4MPa), and Triceram margin ceramic (38.8±7.1MPa) systems.

Conclusions

Margin ceramics, compatible with zirconia framework material tested in the present study, exhibited high bond strength values. Variations in thermal expansion coefficients might influence their bond strength values.

Keywords: Shear bond strength, Zirconia, Margin ceramic, Copy-milling