Effect of hydrofluoric acid etching duration on the roughness ... | 合法醫療器材資訊網

由LVZogheib著作·2011·被引用199次—Theaimofthisstudywastoexaminetheeffectofdifferentacidetchingtimesonthe...roughnessandflexuralstrengthofalithiumdisilicate-basedglassceramic.

The aim of this study was to examine the effect of different acid etching times on the surface roughness and flexural strength of a lithium disilicate-based glass ceramic. Ceramic bar-shaped specimens (16 mm x 2 mm x 2 mm) were produced from ceramic blocks. All specimens were polished and sonically cleaned in distilled water. Specimens were randomly divided into 5 groups (n=15). Group A (control) no treatment. Groups B-E were etched with 4.9% hydrofluoric acid (HF) for 4 different etching periods: 20 s, 60 s, 90 s and 180 s, respectively. Etched surfaces were observed under scanning electron microscopy. Surface profilometry was used to examine the roughness of the etched ceramic surfaces, and the specimens were loaded to failure using a 3-point bending test to determine the flexural strength. Data were analyzed using one-way ANOVA and Tukeys test (?=0.05). All etching periods produced significantly rougher surfaces ...