Mokhtarpour Faraneh, Alaghehmand Homayoon, Khafri Soraya
Assistant Professor, Department of Esthetic and Restorative Dentistry, Babol University of Medical Sciences, Babol, Iran.
Associate Professor, Dental Materials Research Center, Department of Esthetic and Restorative Dentistry, Babol University of Medical Sciences, Babol, Iran.
Electron Physician. 2017 Oct 25;9(10):5487-5493. doi: 10.19082/5487. eCollection 2017 Oct.
Dental ceramics are appreciated as highly esthetic restorative materials that can simulate the appearance of natural dentition better than other materials. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on micro-shear bond strength (μSBS) to IPS e.max CAD and Vita Mark II of a dual cured resin cement (Panavia F2.0).
This study was an experimental in vitro study, performed in the dental material research center of Babol University of Medical Sciences in 2016. Two hydrofluoric acid concentrations (5% and 10%) and three different etching times (20, 60 and 120 seconds) were used to etch the specimens respectively. A silane coupling agent (Clearfil porcelain activator) and priming and bonding agent (Clearfil SE bond) were used on the etched surfaces in accordance to the manufacturer's instructions of use. Then resin cement was applied on the prepared ceramic surfaces and light cured. μSBS between resin cement and the porcelains were measured with a universal testing machine. Mode of failure was observed with 40× magnification by means of a Stereo microscope. Data were analyzed with ANOVA and independent-samples t-test and Chi-square tests.
In both e.max and Vita Mark II groups, μSBS were not significantly different when different etching times (one-way ANOVA) and HF acid concentrations (Independent-samples t-test) were used (p>0.05), but the highest μSBS was shown in e.max specimens etched 60 s with 5% HF and Vita Mark II specimens etched 20 s with 10% HF. μSBS of e.max was significantly higher than Vita Mark II (p=0.00).
Best surface treatment for e.max and Vita Mark II ceramics is 20 s etch using 5 % hydrofluoric acid.
牙科陶瓷被视为高度美观的修复材料，比其他材料能更好地模拟天然牙列的外观。本研究的目的是评估氢氟酸浓度和蚀刻时间对双固化树脂水门汀（Panavia F2.0）与IPS e.max CAD和Vita Mark II之间微剪切粘结强度（μSBS）的影响。
本研究为体外实验研究，于2016年在巴博尔医科大学牙科材料研究中心进行。分别使用两种氢氟酸浓度（5%和10%）和三种不同的蚀刻时间（20、60和120秒）对样本进行蚀刻。根据制造商的使用说明，在蚀刻后的表面使用硅烷偶联剂（Clearfil瓷用活化剂）以及底漆和粘结剂（Clearfil SE粘结剂）。然后将树脂水门汀涂覆在制备好的陶瓷表面并进行光固化。使用万能试验机测量树脂水门汀与陶瓷之间的μSBS。通过体视显微镜以40倍放大倍数观察失效模式。数据采用方差分析、独立样本t检验和卡方检验进行分析。
在e.max和Vita Mark II两组中，当使用不同的蚀刻时间（单因素方差分析）和氢氟酸浓度（独立样本t检验）时，μSBS无显著差异（p>0.05），但最高的μSBS出现在用5%氢氟酸蚀刻60秒的e.max样本以及用10%氢氟酸蚀刻20秒的Vita Mark II样本中。e.max的μSBS显著高于Vita Mark II（p = 0.00）。
对于e.max和Vita Mark II陶瓷，最佳的表面处理方法是使用5%氢氟酸蚀刻20秒。
