Hailan Qian, Lingyan Ren, Rongrong Nie, Xiangfeng Meng
Dept. of Prothodontics, Affiliated Stomatological Hospital, Medical School of Nanjing University, Nanjing Stomatological Hospital, Nanjing 210008, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2017 Dec 1;35(6):593-597. doi: 10.7518/hxkq.2017.06.006.
This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics.
After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9.5% HF] for 20 s. Then, four acidified specimens from each group were randomly selected. One of the specimens was used to observe the surface morphology using scanning electron microscopy, and the others were used to observe the surface roughness using a surface roughness meter (including Ra, Rz, and Rmax). After treatment with different acid solutions in each group, 20 samples were further treated with silane coupling agent/resin adhesive/resin cement (Monobond S/Multilink Primer A&B/Multilink N), followed by bonding to a composite resin column (Filtek™ Z350) with a diameter of 3 mm. A total of 20 specimens in each group were randomly divided into two subgroups, which were used for measuring the microshear bond strength, with one of them subjected to cool-thermal cycle for 20 000 times.
The surface roughness (Ra, Rz, and Rmax) of lithium disilicate glass ceramics treated with 4% or 9.5% HF was significantly higher than that of the ceramic treated with PA (P<0.05). The lithium disilicate glass ceramics treated with 9.5% HF also demonstrated better surface roughness (Rz and Rmax) than that of the ceramics treated with 4% HF. Cool-thermal cycle treatment reduced the bond strength of lithium disilicate glass ceramics in all groups (P<0.05). After cool-thermal cycle, the lithium disilicate glass ceramics treated with HF had higher bond strength than that of the ceramics treated with PA. The lithium disilicate glass ceramics treated with 4% HF had higher bond strength than that of the ceramics treated with 9.5% HF (P<0.05). During cool-thermal cycle, the lithium disilicate glass ceramics treated with 4% HF demonstrated higher reduction in bond strength than that of the samples treated with 9.5% HF (P<0.05).
The concentration of HF significantly affected the surface morphology of lithium disilicate glass ceramics and the bond durability between resin composites and post-treated lithium disilicate glass ceramics. The bond strength between resin composites and post-treated lithium disilicate glass ceramic was more efficiently maintained by treatment with 9.5% HF.
本研究旨在确定不同浓度的氢氟酸（HF）对二硅酸锂玻璃陶瓷表面形态以及树脂复合材料与后处理二硅酸锂玻璃陶瓷之间粘结耐久性的影响。
将72个尺寸为11mm×13mm×2mm的二硅酸锂玻璃陶瓷制备试样烧结、研磨和清洗后，随机分为三组。每组用酸溶液[32%磷酸（PA）或4%或9.5%HF]处理20秒。然后，从每组中随机选取四个酸化试样。其中一个试样用于通过扫描电子显微镜观察表面形态，其他试样用于使用表面粗糙度仪（包括Ra、Rz和Rmax）观察表面粗糙度。每组用不同酸溶液处理后，20个样品进一步用硅烷偶联剂/树脂粘结剂/树脂水门汀（Monobond S/Multilink Primer A&B/Multilink N）处理，然后粘结到直径为3mm的复合树脂柱（Filtek™ Z350）上。每组共20个试样随机分为两个亚组，用于测量微剪切粘结强度，其中一组进行20000次冷热循环。
用4%或9.5%HF处理的二硅酸锂玻璃陶瓷的表面粗糙度（Ra、Rz和Rmax）显著高于用PA处理的陶瓷（P<0.05）。用9.5%HF处理的二硅酸锂玻璃陶瓷的表面粗糙度（Rz和Rmax）也优于用4%HF处理的陶瓷。冷热循环处理降低了所有组中二硅酸锂玻璃陶瓷的粘结强度（P<0.05）。冷热循环后，用HF处理的二硅酸锂玻璃陶瓷的粘结强度高于用PA处理的陶瓷。用4%HF处理的二硅酸锂玻璃陶瓷的粘结强度高于用9.5%HF处理的陶瓷（P<0.05）。在冷热循环过程中，用4%HF处理的二硅酸锂玻璃陶瓷的粘结强度降低幅度高于用9.5%HF处理的样品（P<0.05）。
HF浓度显著影响二硅酸锂玻璃陶瓷的表面形态以及树脂复合材料与后处理二硅酸锂玻璃陶瓷之间的粘结耐久性。用9.5%HF处理能更有效地维持树脂复合材料与后处理二硅酸锂玻璃陶瓷之间的粘结强度。
