Prochnow Catina, Venturini Andressa B, Grasel Rafaella, Bottino Marco C, Valandro Luiz Felipe
PhD Graduate Program in Oral Sciences (Prosthodontics Unit), School of Dentistry, Federal University of Santa Maria, Rio Grande do Sul State, Santa Maria, Brazil.
Department of Restorative Dentistry (Division of Dental Biomaterials), Indiana University School of Dentistry, Indianapolis, Indiana.
J Biomed Mater Res B Appl Biomater. 2017 May;105(4):885-891. doi: 10.1002/jbm.b.33619. Epub 2016 Feb 5.
This study examined the effects of distinct hydrofluoric acid concentrations on the mechanical behavior of a lithium disilicate-based glass ceramic. Bar-shaped specimens were produced from ceramic blocks (e.max CAD, Ivoclar Vivadent). The specimens were polished, chamfered, and sonically cleaned in distilled water. The specimens were randomly divided into five groups (n = 23). The HF1, HF3, HF5, and HF10 specimens were etched for 20 s with acid concentrations of 1%, 3%, 5%, and 10%, respectively, while the SC (control) sample was untreated. The etched surfaces were evaluated using a scanning electron microscope and an atomic force microscope. Finally, the roughness was measured, and 3-point bending flexural tests were performed. The data were analyzed using one-way analysis of variance (ANOVA) and Tukey's test (α = 0.05). The Weibull modulus and characteristic strength were also determined. No statistical difference in the roughness and flexural strength was determined among the groups. The structural reliabilities (Weilbull moduli) were similar for the tested groups; however, the characteristic strength of the HF1 specimen was greater than that of the HF10 specimen. Compared with the untreated ceramic, the surface roughness and flexural strength of the ceramic were unaffected upon etching, regardless of the acid concentration. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 885-891, 2017.
本研究考察了不同氢氟酸浓度对锂二硅酸盐基玻璃陶瓷力学性能的影响。从陶瓷块（e.max CAD，义获嘉伟瓦登特公司）制备条形试样。对试样进行抛光、倒角，并在蒸馏水中进行超声清洗。将试样随机分为五组（n = 23）。HF1、HF3、HF5和HF10试样分别用浓度为1%、3%、5%和10%的酸蚀刻20 s，而SC（对照）样品未进行处理。使用扫描电子显微镜和原子力显微镜对蚀刻表面进行评估。最后，测量粗糙度，并进行三点弯曲挠曲试验。使用单向方差分析（ANOVA）和Tukey检验（α = 0.05）对数据进行分析。还测定了威布尔模量和特征强度。各组之间在粗糙度和挠曲强度方面未确定有统计学差异。测试组的结构可靠性（威布尔模量）相似；然而，HF1试样的特征强度大于HF10试样。与未处理的陶瓷相比，无论酸浓度如何，蚀刻后陶瓷的表面粗糙度和挠曲强度均未受影响。© 2016威利期刊公司。《生物医学材料研究杂志》B部分：应用生物材料，105B：885 - 891，2017。
