The effect of aging on composition and surface of translucent zirconia ceramic

Mešić, Korina; Majnarić, Igor; Obhođaš, Jasmina; Baršić, Gorana; Mehulić, Ketij (2020) The effect of aging on composition and surface of translucent zirconia ceramic. Acta stomatologica Croatica, 54 (4). pp. 339-352. ISSN 0001-7019

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Abstract

Objectives: To examine the effect of two aging protocols on the chemical and phase composition as well as the surface state of monolithic translucent zirconia ceramics. Material and Methods: Translucent zirconia ceramics KATANA- Zirconia STML with different surface treatments (no treatment, K1, K2 ; glazed, G1-G8 ; polished, P1-P8) underwent testing in order to examine how the two aging protocols (three-hour hydrothermal degradation in an autoclave at 134 °C and 2 bars: G1-G4, P1-P4, and sixteen-hour chemical degradation in four- percent acetic acid at 80 °C (ISO 6872): G5-G8, P5-P8) affect chemical composition, particularly the share of stabilizing yttrium oxide (Energy Dispersive XRay Fluorescence – EDXRF), phase composition (X-ray diffraction – XRD) and surface state in terms of roughness and gloss. Results: Aging protocols did not affect the tested chemical composition stability of specimens and a high share of stabilizing yttrium-oxide (≥10% of total content), which correlates with the absence of monoclinic phase. A decrease in gloss on all specimens is statistically significant. Chemical degradation substantially increased the surface roughness of tested specimens. Conclusions: Translucent monolithic zirconia demonstrated a stable chemical composition and resistance to tetragonal-to-monoclinic transformation. Surface gloss was significantly reduced, especially in polished specimens. Contrary to glazed specimens, the tested polished specimens manifested an increase in surface roughness. Glazing the surface of translucent monolithic zirconia produces better esthetic, tribological and hygienic effects than polishing.

Item Type:	Article
Uncontrolled Keywords:	zirconia ; dental materials ; materials testing ; surface properties ; dental polishing
Subjects:	BIOMEDICINE AND HEALTHCARE > Dental Medicine
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Definiranje mogućnosti uporabe mini dentalnih implantata (MDI) i njihovi rezultati u in vitro i u kliničkim prospektivnim istraživanjima UNSPECIFIED IP-2014-09-1218 HRZZ
Depositing User:	Jasmina Obhođaš
Date Deposited:	20 Jan 2022 15:12
URI:	http://fulir.irb.hr/id/eprint/6895
DOI:	10.15644/asc54/4/1

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