Samimi P, Mortazavi V, Salamat F
Oper Dent. 2014 Sep-Oct;39(5):E217-24. doi: 10.2341/11-486-L. Epub 2014 May 8.
The aims of this study were to compare two pretreatment methods of a fiber post and to evaluate the effect of heat treatment to applied silane on the push-out bond strength for different levels of root. In this in vitro study, 40 glass fiber posts were divided into five groups (n=8) according to the kind of surface treatment applied. They were then inserted into extracted and endodontically treated human canines using a self-etch resin cement (Panavia F2.0, Kuraray, Japan). Group HF+S = hydrofluoric acid (HF) etching and silane (S) application; group HF+S+WP = HF etching and heat-treated silane application and warmed posts (WP); group H2O2+S = hydrogen peroxide etching and silane application; group H2O2+S+WP = hydrogen peroxide and heat-treated-silane application and warmed post; and group C, the control group, received no pretreatment. After completion of thermal cycling (1000 cycles, 5-55°C), all specimens were cut horizontally to obtain three sections. Each section was subjected to a push-out test, and the test results were analyzed using two-way analysis of variance, post-hoc Tukey honestly significant difference test, and a paired sample t-test (α=0.05). It was found that bond strength was not statistically influenced by the kind of etching material used (p=0.224), but was significantly affected by heat treatment of applied silane (p<0.001). The interaction between these two factors was not statistically significant (p=0.142). Group HF+S+WP showed the highest bond strength (12.56±1.73 MPa) (p<0.05). Scanning electron microscopy revealed the effect of the different treatments on the surface characteristics of posts. In the four pretreated groups, the bond strength decreased significantly from the coronal to the apical root canal sections (p≤0.05). The results of this study show that the use of heat-treated silane significantly enhances the push-out bond strength of the fiber posts to root. HF acid etching with heat-treated silane application led to the highest bond strength.
本研究的目的是比较纤维桩的两种预处理方法，并评估热处理对不同牙根水平施加硅烷后的推出粘结强度的影响。在这项体外研究中，根据表面处理类型将40根玻璃纤维桩分为五组（n = 8）。然后使用自酸蚀树脂水门汀（Panavia F2.0，日本可乐丽公司）将它们插入拔除并经过根管治疗的人犬齿中。HF+S组 = 氢氟酸（HF）蚀刻并施加硅烷（S）；HF+S+WP组 = HF蚀刻并施加热处理硅烷以及温热桩（WP）；H2O2+S组 = 过氧化氢蚀刻并施加硅烷；H2O2+S+WP组 = 过氧化氢和热处理硅烷施加以及温热桩；C组为对照组，未进行预处理。在完成热循环（1000次循环，5 - 55°C）后，将所有标本水平切割以获得三个切片。对每个切片进行推出试验，并使用双向方差分析、事后Tukey真实显著差异检验和配对样本t检验（α = 0.05）对试验结果进行分析。结果发现，粘结强度在统计学上不受所用蚀刻材料种类的影响（p = 0.224），但受施加硅烷的热处理的显著影响（p < 0.001）。这两个因素之间的相互作用在统计学上不显著（p = 0.142）。HF+S+WP组显示出最高的粘结强度（12.56±1.73 MPa）（p < 0.05）。扫描电子显微镜揭示了不同处理对桩表面特征的影响。在四个预处理组中，粘结强度从冠部到根尖根管段显著降低（p≤0.05）。本研究结果表明，使用热处理硅烷可显著提高纤维桩与牙根的推出粘结强度。氢氟酸蚀刻并施加热处理硅烷导致最高的粘结强度。
