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Abrasive effect of brushing on ormocers following acid conditioning
Can Dorter1, Esra Yildiz, Yavuz Gomec
1Department of Operative Dentistry, Faculty of Dentistry, Istanbul University, Capa, 34390, Istanbul, Turkey.
Dental Materials Journal
|March 10, 2004
Summary
Toothbrushing significantly impacts the surface of ormocer materials, especially after acid exposure. Brushing following acid conditioning leads to smoother surfaces and increased microhardness for Admira and Definite.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Surface Science
Background:
- Ormocer (organically modified ceramic) materials are widely used in dental restorations.
- Surface properties like roughness and microhardness are critical for restoration longevity.
- Acidic environments, common in the oral cavity, can affect dental material surfaces.
Purpose of the Study:
- To investigate the effects of toothbrushing and acid conditioning on the surface roughness and microhardness of two ormocer materials: Admira and Definite.
- To compare the outcomes of different treatment sequences (acid conditioning followed by brushing, brushing alone, acid conditioning alone).
Main Methods:
- Samples of Admira and Definite were subjected to four conditions: control, brushing alone, acid conditioning (24 hours in pH 1.9 orthophosphoric acid), and acid conditioning followed by brushing.
- Surface roughness was measured using profilometry.
- Microhardness was assessed using Vickers microhardness testing.
- All tests were performed after 10 minutes of electric toothbrushing with a slurry.
Main Results:
- Acidic storage alone did not significantly alter the surface roughness of either ormocer material.
- However, toothbrushing, both alone and after acid conditioning, resulted in significantly rougher surfaces compared to controls or acid-conditioned-only specimens.
- Microhardness significantly increased in both materials when subjected to brushing after acid conditioning, compared to brushing alone.
Conclusions:
- Toothbrushing significantly affects the surface topography and mechanical properties of Admira and Definite ormocer materials.
- Acid conditioning prior to toothbrushing enhances the microhardness of these materials, suggesting a potential protective or modifying effect on the surface layer.
- The findings highlight the importance of considering both mechanical (brushing) and chemical (acid) challenges when evaluating the durability of ormocer dental restorations.