Journal of Dentistry
Volume 37, Issue 11 , Pages 848-856, November 2009

Surface roughness and bond strengths of glass-infiltrated alumina-ceramics prepared using various surface treatments

  • Bahadır Ersu

      Affiliations

    • Hacettepe University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey
    • ,
  • Bulem Yuzugullu

      Affiliations

    • Baskent University, Faculty of Dentistry, Department of Prosthodontics, 11. st. No: 26 06490 Bahcelievler, Ankara, Turkey
    • Corresponding Author InformationCorresponding author. Fax: +90 312 215 29 62.
    • ,
  • A. Ruya Yazici

      Affiliations

    • Hacettepe University, Faculty of Dentistry, Department of Conservative Dentistry, Ankara, Turkey
    • ,
  • Senay Canay

      Affiliations

    • Hacettepe University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey

Received 22 February 2009; received in revised form 22 June 2009; accepted 23 June 2009. published online 02 July 2009.

Abstract 

Objectives

To compare and evaluate effects of CO2 laser and conventional surface treatments on surface roughness and shear bond strengths of glass-infiltrated alumina-ceramics to dentin.

Methods

One hundred fifty ceramic discs of In-Ceram Spinell, In-Ceram Alumina and In-Ceram Zirconia (n=50) were prepared. Specimens which were divided into 5 groups (n=10) were untreated (control group), sandblasted, airborne particle abraded, etched with 9.6% hydrofluoric acid or irradiated with CO2 laser. Scanning electron microscope was used at 1000× magnification for qualitative examination. Following surface roughness (Ra) determination by profilometry, discs were cemented on extracted-human-molar teeth. Cemented specimens were stored in distilled water at 37°C for 1 week. Shear bond strength (MPa) test was performed using a universal testing machine at a crosshead speed of 1mm/min. Statistical comparisons were made with Wilcoxon signed ranked test, Kruskall Wallis test and Spearman's correlation coefficient.

Results

All surface treatments produced rougher surfaces than the untreated groups of all ceramics (P<.05). Sandblasting demonstrated a rougher surface on In-Ceram Spinell than In-Ceram Alumina and In-Ceram Zirconia (P<.05). While CO2 laser irradiation showed significantly higher bond strength for In-Ceram Spinell (P<.05), both airborne particle abrasion and CO2 laser irradiation showed higher bond strengths for In-Ceram Zirconia (P<.05). Airborne particle abrasion demonstrated higher bond strength for In-Ceram Alumina and In-Ceram Zirconia (P<.05). No significant relationship was determined between surface roughness (Ra) and shear bond strength values (MPa) among ceramic groups.

Conclusions

Sandblasting is an effective surface treatment for roughening surfaces of In-Ceram Spinell. Although CO2 laser irradiation does not increase surface roughness, it reveals the highest bond strength.

Keywords: Glass-infiltrated alumina-ceramic, Surface treatment, CO2 laser, Surface roughness, Shear bond strength

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PII: S0300-5712(09)00163-8

doi:10.1016/j.jdent.2009.06.017

Journal of Dentistry
Volume 37, Issue 11 , Pages 848-856, November 2009

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