Stomatologija · 2024
Effect of simulated gastric acid on the surface degradation of dental ceramics.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Madriz-Montalván Noelia, Ortiz-Magdaleno Marine, Zavala-Alonso Norma Verónica, Pérez-López José Elías, Sánchez-Balderas Gregorio, Escobar-García Diana María, Silva-Benítez Erika Lourdes, Romo-Ramírez Gabriel Fernando
Аннотация
OBJECTIVE: The aim of this study was to compare the effect in vitro of simulated gastric acid solution on the roughness, microhardness and micro-structural topography surface of two dental ceramics: lithium disilicate glass-ceramic and monolithic zirconium dioxide (ZrO2) at baseline and after different immersion time.
MATERIALS AND METHODS: Lithium disilicate and ZrO2glass-ceramic discs were fabricated (40 of each one) and was evaluated under microscope the roughness (Atomic force microscopy), microhardness (Vickers hardness tester) and micro-structural topography surface (Scanning electron microscopy) before immersion (baseline) and after three periods of immersion: 8 h 25 min, 46 h 2.5 min and 92 h 5 min in simulated gastric acid solution of hydrochloric acid (HCl, 0.06 M, pH 1.2) at 37 ºC. The ceramics were compared over time with a repeated measures analysis of variance (ANOVA).
RESULTS: Statistically significant changes (P<.05) were found in the microhardness values between both ceramics, which decreased after all times points of immersion in simulated gastric acid solution, ZrO2showed higher microhardness mean values (P<.05) but lithium disilicate showed significant changes (P <.05) in the surface microhardness at baseline versus the three immersion times. Lithium disilicate had higher roughness values than ZrO2(P<.05), which increased after 8 h 25 min of immersion; however, after 46 h 2.5 min and 92 h 5 min of immersion, the roughness decreased. More microporosities were observed in the lithium disilicate surface than with ZrO2.
CONCLUSION: The simulated gastric acid solution of HCl affected the roughness, microhardness and micro-structural topography surface of both lithium disilicate and ZrO2, but greater surface degradation was presented lithium disilicate.
MATERIALS AND METHODS: Lithium disilicate and ZrO2glass-ceramic discs were fabricated (40 of each one) and was evaluated under microscope the roughness (Atomic force microscopy), microhardness (Vickers hardness tester) and micro-structural topography surface (Scanning electron microscopy) before immersion (baseline) and after three periods of immersion: 8 h 25 min, 46 h 2.5 min and 92 h 5 min in simulated gastric acid solution of hydrochloric acid (HCl, 0.06 M, pH 1.2) at 37 ºC. The ceramics were compared over time with a repeated measures analysis of variance (ANOVA).
RESULTS: Statistically significant changes (P<.05) were found in the microhardness values between both ceramics, which decreased after all times points of immersion in simulated gastric acid solution, ZrO2showed higher microhardness mean values (P<.05) but lithium disilicate showed significant changes (P <.05) in the surface microhardness at baseline versus the three immersion times. Lithium disilicate had higher roughness values than ZrO2(P<.05), which increased after 8 h 25 min of immersion; however, after 46 h 2.5 min and 92 h 5 min of immersion, the roughness decreased. More microporosities were observed in the lithium disilicate surface than with ZrO2.
CONCLUSION: The simulated gastric acid solution of HCl affected the roughness, microhardness and micro-structural topography surface of both lithium disilicate and ZrO2, but greater surface degradation was presented lithium disilicate.