Effect of four surface treatment methods on the shear bond strength of resin cement to zirconia ceramics- a comparative in vitro study.
BACKGROUND
Improving the retention of zirconia-based ceramics is desirable in order to avoid the failure of crowns and fixed partial dentures .This can be achieved by creating micromechanical retention using surface treatments. Therefore, it becomes necessary to constantly compare and re-evaluate the influence of different surface treatment methods on the bond strength .


OBJECTIVE
To evaluate the effect of four different surface treatments on shear bond strength between zirconia surface and resin cements.


METHODS
Observational study.


METHODS
Twenty five zirconia plate samples were prepared based on ISO standards and were divided into five groups and each group was subjected to following five different surface treatments : no treatment, sandblasting with 110 μm alumina, sandblasting with 250 μm alumina, acid etching with 9.6% hydrofluoric acid and laser radiation on the surface. All the samples were surface disinfected and were embedded in blocks of autopolymerising resin to check shear bond strength on the universal testing machine. Statistical analysis used-data was analyzed using one-way ANOVA and a Post Hoc Bonferroni test.


RESULTS
Analysis of the data showed that the highest shear bond strength values were obtained with laser treatment (18.120 ± 0.8159 Mpa). The lowest values were obtained with control group (9.166 ± 0.569 Mpa). Laser treatment increased the shear bond strength values significantly (p<0.05).


CONCLUSIONS
Surface treatments increased the bond strength between zirconia and resin cement and carbon dioxide laser could be an effective surface treatment for increasing bond strength.
Assosiate Professor, Department of Prosthodontics, Indira Gandhi Institute of Dental Sciences , Pillayarkuppam, Pondicherry, India .
Varsha
V
Murthy
Professor, Department of Prosthodontics, Indira Gandhi Institute of Dental Sciences , Pillayarkuppam, Pondicherry, India .
Manoharan
Postgraduate Student, Department of Prosthodontics, Indira Gandhi Institute of Dental Sciences , Pillayarkuppam Pondicherry, India .
Balaji
Assosiate Professor, Department of Prosthodontics, Indira Gandhi Institute of Dental Sciences , Pillayarkuppam, Pondicherry, India .
David
D
Livingstone
Airborne particle abrasion; Carbon dioxide laser; Hf acid etching; Laser etching; Shear bond strength; Surface treatment