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Minerva Stomatologica 2011 March;60(3):117-22


language: English

Silica coating on alumina ceramic: comparison of three chairside air-abrasion devices working for different times and distances

Pestana Passos S. 1, Dias Vanderlei A. 1, Özcan M. 2, Felipe Valandro L. F. 3, 4

1 Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University at São José dos Campos, Brazil 2 Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable 3Prosthodontics and Dental, Materials Science, University of Zurich, Zurich, Switzerland 4 Division of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria at Santa Maria, Brazil


AIM: This study evaluated, by scanning electron microscope (SEM) and EDS, the effect of different strategies for silica coating (sandblasters, time and distance) of a glass-infiltrated ceramic (In-Ceram Alumina).
METHODS: Forty-one ceramic blocks were produced. For comparison of the three air-abrasion devices, 15 ceramic samples were divided in three groups (N.=5): Bioart, Microetcher and Ronvig (air-abrasion parameters: 20 s at a distance of 10 mm). For evaluation of the time and distance factors, ceramic samples (N.=5) were allocated in groups considering three applied times (5 s, 13 s and 20 s) and two distances (10 mm and 20 mm), using the Ronvig device. In a control sample, no surface treatment was performed. After that, the micro-morphologic analyzes of the ceramic surfaces were made using SEM. EDS analyzes were carried out to detect the % of silica on representative ceramic surface. ANOVA and Tukey tests were used to analyze the results.
RESULTS: One-way ANOVA showed the silica deposition was different for different devices (P=0.0054). The Ronvig device promoted the highest silica coating compared to the other devices (Tukey test). Two-way ANOVA showed the distance and time factors did not affect significantly the silica deposition (application time and distance showed no statistical difference).
CONCLUSION: The Ronvig device provided the most effective silica deposition on glass-infiltrated alumina ceramic surface and the studied time and distance for air-abrasion did not affect the silica coating.

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