Vechiato-Filho Aljomar José, Dos Santos Daniela Micheline, Goiato Marcelo Coelho, Moreno Amália, De Medeiros Rodrigo Antonio, Kina Sidney, Rangel Elidiane Cipriano, Da Cruz Nilson Cristino
Am J Dent. 2015 Jun;28(3):174-80.
To analyze whether immersion in sodium fluoride (NaF) solutions and/or common acidic beverages (test solutions) would affect the surface roughness or topography of lithium disilicate ceramic.
220 ceramic discs were divided into four groups, each of which was subdivided into five subgroups (n = 11). Control group discs were immersed in one of four test beverages for 4 hours daily or in artificial saliva for 21 days. Discs in the experimental groups were continuously immersed in 0.05% NaF, 0.2% NaF, or 1.23% acidulated phosphate fluoride (APF) gel for 12, 73, and 48 hours, respectively, followed by immersion in one of the four test beverages or artificial saliva. Vickers microhardness, surface roughness, scanning electron microscopy (SEM) associated with energy dispersive spectroscopy, and atomic force microscopy (AFM) assessments were made. Data were analyzed by nested analysis of variance (ANOVA) and Tukey's test (α = 0.05).
Immersion in the test solutions diminished the microhardness and increased the surface roughness of the discs. The test beverages promoted a significant reduction in the Vickers microhardness in the 0.05% and 0.2% NaF groups. The highest surface roughness results were observed in the 0.2% NaF and 1.23% APF groups, with similar findings by SEM and AFM. Acidic beverages affected the surface topography of lithium disilicate ceramic. Fluoride treatments may render the ceramic surface more susceptible to the chelating effect of acidic solutions.
分析浸泡在氟化钠（NaF）溶液和/或常见酸性饮料（测试溶液）中是否会影响二硅酸锂陶瓷的表面粗糙度或形貌。
将220个陶瓷圆盘分为四组，每组再细分为五个亚组（n = 11）。对照组圆盘每天浸泡在四种测试饮料之一中4小时或浸泡在人工唾液中21天。实验组的圆盘分别连续浸泡在0.05% NaF、0.2% NaF或1.23% 酸化磷酸氟（APF）凝胶中12、73和48小时，然后浸泡在四种测试饮料之一或人工唾液中。进行维氏显微硬度、表面粗糙度、与能量色散光谱相关的扫描电子显微镜（SEM）以及原子力显微镜（AFM）评估。数据通过嵌套方差分析（ANOVA）和Tukey检验进行分析（α = 0.05）。
浸泡在测试溶液中会降低圆盘的显微硬度并增加其表面粗糙度。测试饮料使0.05%和0.2% NaF组的维氏显微硬度显著降低。在0.2% NaF和1.23% APF组中观察到最高的表面粗糙度结果，SEM和AFM的结果相似。酸性饮料影响了二硅酸锂陶瓷的表面形貌。氟化物处理可能使陶瓷表面更容易受到酸性溶液的螯合作用。
