Original Research Article
Year: 2020 | Month: February | Volume: 10 | Issue: 2 | Pages: 166-174
Effect of Different Glaze Coating of Zirconia Based Ceramics on Surface Roughness and Shear Bond Strength
Shereen Mohamed Abdelmeguid1, Alaa Makee2, Khaled Aly Elbanna3, Mohamed Fattouh Abdullah3, Omar Ahmed Aboelela3, Zeinab Nabil Emam1
1Associate Professor, 3Assistant Professor,
Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry, Umm Al-Qura University.
2Assistant Professor, Faculty of Dentistry, Umm Al-Qura University.
Corresponding Author: Shereen Mohamed Abdelmeguid
ABSTRACT
Objectives: The aim of the study was to assess the effect of different glaze coating on micro-shear bond strength (μSBS) between zirconia based ceramic and two adhesive resin cements.
Materials and Methods: Twenty four zirconium oxide disc specimens were milled using CAD/CAM. The specimens were divided into three equal groups according to the type of the surface treatment: group I: Air borne particle abrasion 50 ≤µm Al2O3 particles, group II:VM9 glaze material was coated to one side of the zirconia core discs(Vita Zahnfabrik ,Bad sackingen, Germany), group III :IPS e.max glaze material was coated to one side of the zirconia core discs(IPS e.max , Ivoclar Vivadent, Liechtenstein ,Germany).The discs of each group were further subdivided into two equal subgroups according to the adhesive resin cement: subgroup A: Total-etch adhesive resin cement, subgroup B: Self –adhesive resin cement was used. After different surface treatments, surface roughness (Ra) in μm was analyzed using digital microscope. The two types of resin cement were applied to the pretreated ceramic discs and μSBS was measured using a universal testing machine. The mode of failure of the debonded specimens was determined by SEM.
Results: There was no statistically significant difference between the mean surface roughness values of the three tested groups. Disc glazed with VM9 material showed statistically significant highest mean μSBS values than discs glazed with e-max material, while sandblasted zirconia discs showed the statistically significantly lowest mean μSBS.
Conclusion: Silica based ceramic coating to zirconia restoration significantly improved the μSBS to adhesive resin cements
Key words: zirconia, Glaze-on, Adhesive resin cement, Surface treatment, microshear bond strength, surface roughness.