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Surface conditioning methods and polishing techniques effect on surface roughness of a feldspar ceramic
Y Sinasi Saraç1, Selma Elekdag-Turk, Duygu Saraç
1Department of Prosthodontics, Faculty of Dentistry, University of Ondokuz Mayis, Kurupelit, Samsun,Turkey. ssarac@omu.edu.tr
The Angle Orthodontist
|July 4, 2007
Summary
Air-particle abrasion (APA) or APA with hydrofluoric acid (HFA) created rougher feldspathic ceramic surfaces than HFA alone. Polishing techniques using an adjustment kit were effective for smoothing porcelain surfaces.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Surface Science
Background:
- Surface conditioning is crucial for achieving optimal shear bond strength (SBS) in dental ceramics.
- Feldspathic ceramics require specific surface treatments to enhance adhesion.
- Understanding the impact of different conditioning and polishing methods on ceramic surface properties is essential for clinical success.
Purpose of the Study:
- To evaluate the effect of three surface conditioning methods on the shear bond strength (SBS) of feldspathic ceramic.
- To assess the impact of these conditioning methods on the surface roughness (Ra) of the ceramic.
- To compare the efficacy of three polishing techniques in modifying the ceramic surface.
Main Methods:
- 106 feldspathic specimens were conditioned using air-particle abrasion (APA) with aluminum trioxide, hydrofluoric acid (HFA), or a combination of APA and HFA.
- Shear bond strength (SBS) testing was performed on bonded metal brackets.
- Surface roughness (Ra) was measured using profilometry before and after applying three polishing techniques: adjustment kit, diamond polishing paste, or both.
Main Results:
- Hydrofluoric acid (HFA) conditioning resulted in the lowest SBS and surface roughness (Ra).
- Air-particle abrasion (APA) or APA combined with HFA produced significantly rougher surfaces compared to HFA alone.
- No significant differences in Ra were found between APA and APA + HFA groups.
- Polishing techniques involving an adjustment kit, with or without diamond paste, effectively smoothed the ceramic surfaces without significant differences between them.
Conclusions:
- Surface conditioning with APA or APA + HFA leads to increased surface roughness of feldspathic ceramics compared to HFA alone.
- Both the adjustment kit and the combination of adjustment kit plus diamond polishing paste are effective in smoothing porcelain surfaces.
- Neither polishing method demonstrated superiority over the other in smoothing the ceramic surface.
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