Zicari Francesca, Couthino Eduardo, De Munck Jan, Poitevin André, Scotti Roberto, Naert Ignace, Van Meerbeek Bart
Leuven BIOMAT Research Cluster, Department of Prosthetic Dentistry, Catholic University of Leuven, Belgium.
Dent Mater. 2008 Jul;24(7):967-77. doi: 10.1016/j.dental.2007.11.011. Epub 2008 Jan 3.
To evaluate the push-out bond strength and the sealing ability of five adhesive cements routinely used for fiber-post bonding.
Fifty extracted single-rooted teeth were randomly divided in five groups and restored using Parapost FiberLux and the following luting agents: Panavia 21 (PAN), Clearfil Esthetic Cement (CLF), Variolink II (VAR), RelyX Unicem (UNI) and experimental GC self-adhesive cement (EGC). After 1 week of water storage at 37 degrees C, three sections (coronal, middle and apical) of 2mm thickness were prepared from each specimen. Sealing ability was quantified with a fluid-filtration system (Flodec) during 10 min, after which the push-out bond strength was immediately measured. Data were analyzed with ANOVA (push-out) and Kruskal-Wallis (sealing ability).
The push-out bond strength and sealing ability were not significantly different among the coronal, middle and apical sections for each luting agent. The highest push-out bond strength was measured for CLF (14.60+/-3.63 MPa), which was not significantly different from PAN (12.57+/-2.45 MPa), but significantly higher than VAR (11.09+/-4.09 MPa), UNI (11.29+/-4.31 MPa) and EGC (7.65+/-4.79 MPa). When evaluating the sealing ability, significant differences were not found among PAN, CLF and VAR, and between UNI and EGC. The latter luting agents scored significantly lower than the former ones. The push-out bond strength was correlated to the sealing ability (p<0.001).
The self-etching MDP-based cements presented the highest push-out bond strength. Although the bonding effectiveness of self-adhesive cements appears promising, their interaction with root dentin might be too weak to minimize microleakage at the post-cement-dentin interface.
评估五种常用于纤维桩粘结的粘结水门汀的推出粘结强度和封闭能力。
将50颗拔除的单根牙随机分为五组，使用Parapost FiberLux和以下粘结剂进行修复：Panavia 21（PAN）、Clearfil Esthetic Cement（CLF）、Variolink II（VAR）、RelyX Unicem（UNI）和实验性GC自粘结水门汀（EGC）。在37℃下储存1周后，从每个标本制备三个厚度为2mm的切片（冠部、中部和根尖部）。在10分钟内使用流体过滤系统（Flodec）对封闭能力进行定量，之后立即测量推出粘结强度。数据采用方差分析（推出粘结强度）和Kruskal-Wallis检验（封闭能力）进行分析。
对于每种粘结剂，冠部、中部和根尖部切片的推出粘结强度和封闭能力没有显著差异。CLF的推出粘结强度最高（14.60±3.63MPa），与PAN（12.57±2.45MPa）没有显著差异，但显著高于VAR（11.09±4.09MPa）、UNI（11.29±4.31MPa）和EGC（7.65±4.79MPa）。在评估封闭能力时，PAN、CLF和VAR之间以及UNI和EGC之间没有发现显著差异。后一种粘结剂的得分显著低于前一种粘结剂。推出粘结强度与封闭能力相关（p<0.001）。
基于自酸蚀MDP的水门汀具有最高的推出粘结强度。尽管自粘结水门汀的粘结效果看起来很有前景，但它们与根管牙本质的相互作用可能太弱，无法将桩-水门汀-牙本质界面的微渗漏降至最低。
