Naslov
Utjecaj starenja na sastav i površinu translucentne cirkonij-oksidne keramike
(The effect of aging on composition and surface of translucent zirconia ceramic)

Autori
Mešić, Korina ; Majnarić, Igor ; Obhođaš, Jasmina ; Baršić, Gorana ; Mehulić, Ketij

Izvornik
Acta stomatologica Croatica (0001-7019) 54 (2020), 4; 339-352

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cirkonij ; stomatološki materijali ; ispitivanje materijala ; površinska svojstva ; stomatološko poliranje
(zirconia ; dental materials ; materials testing ; surface properties ; dental polishing)

Sažetak
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.

Izvorni jezik
Hrvatski, engleski

Znanstvena područja
Dentalna medicina

POVEZANOST RADA