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Title

EFFECTS OF DIFFERENT LASERS AND PARTICLE ABRASION ON SURFACE CHARACTERISTICS OF ZIRCONIA CERAMICS

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 Start Page 233 | End Page 241

Abstract

 Objective: The aim of this study was to assess the surface of yttrium-stabilized tetragonal ZIRCONIA (Y-TZP) after surface treatment with lasers and airborne-particle abrasion.Materials and Methods: First, 77 samples of presintered ZIRCONIA blocks measuring 10×10×2 mm were made, sintered and polished. Then, they were randomly divided into 11 groups (n=7) and received surface treatments namely, Er: YAG laser irradiation with out-put power of 1.5, 2 and 2.5 W, Nd: YAG laser with output power of 1.5, 2 and 2.5 W, CO2 laser with output power of 3, 4 and 5 W, AL2O3 airborne-particle abrasion (50m) and no treatment (controls). Following treatment, the parameters of surface roughness such as Ra, Rku and Rsk were evaluated using a digital profilometer and surface examination was done by SEM.Results: According to ANOVA and Tukey’s test, the mean surface roughness (Ra) after Nd: YAG laser irradiation at 2 and 2.5 W was significantly higher than other groups. Roughness increased with increasing output power of Nd: YAG and CO2 lasers. Treated surfaces by Er: YAG laser and AIR ABRASION showed similar surface roughness. SEM micro-graphs showed small microcracks in specimens irradiated with Nd: YAG and CO2 lasers.Conclusion: Nd: YAG laser created a rough surface on the ZIRCONIA ceramic with many microcracks; therefore, its use is not recommended. AIR ABRASION method can be used with Er: YAG laser irradiation for the treatment of ZIRCONIA ceramic.

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