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Year : 2015  |  Volume : 18  |  Issue : 1  |  Page : 124-129

Surface roughness and morphologic changes of zirconia: Effect of different surface treatment

1 Department of Prosthodontics, Faculty of Dentistry, Akdeniz University, Antalya, Turkey
2 Department of Endodontics, Faculty of Dentistry, Akdeniz University, Antalya, Turkey
3 Department of Restorative Dentistry, Faculty of Dentistry, Cumhuriyet University, Sivas, Turkey

Correspondence Address:
O Kirmali
Department of Prosthodontics, Faculty of Dentistry, Akdeniz University, Antalya
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1119-3077.146994

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Purpose: The purpose of this study was to investigate the surface roughness and morphologic changes of pre-sintered ZrO 2 after sandblasting and erbium, chromium: Yttrium, scandium, gallium, garnet (Er, Cr: YSGG) laser application of different intensities. Material and Methods: Eighty pre-sintered ZrO 2 cylinders (7 mm diameter, 3 mm height) were prepared and divided into eight groups. Specimens in the control group were not treated. The following treatments were applied: Er, Cr: YSGG laser irradiation with different energy intensities (1-6 W at 20 Hz, with air-water cooling proportion of 65%/55%) and air abrasion with Al 2 O 3 particles (120 μm). Then, all the specimens were sintered. The average surface roughness of each specimen was determined with a profilometer, and the morphology changes of a specimen from each group were evaluated with scanning electron microscope (SEM) analyses. The surface roughness data were analyzed through one-way analysis of variance and Tukey's honestly significant difference test (P < 0.05). Results: There were significant differences between 2 and 6 W irradiations and control group. The highest surface roughness value was obtained with 6 W irradiation (8.14 ± 1.26 Ra), followed by the 5 W (7.60 ± 1.12 Ra), 4 W (7.50 ± 0.90 Ra), 3 W (5.86 ± 1.03 Ra), 2 W (4.54 ± 0.53 Ra) and sandblasting group (2.18 ± 0.92 Ra). 1 W laser irradiation (0.80 ± 0.06 Ra) presented Ra values similar to the control group (0.77 ± 0.03). Conclusion: The result of the statistical analyses and SEM images showed that Er, Cr: YSGG laser irradiation with 4-6 W/20 Hz presented significantly effect in surface roughness changes of zirconia than other surface treatments.

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