Pereira Jefferson Ricardo, Rosa Ricardo Abreu da, Só Marcus Vinícius Reis, Afonso Daniele, Kuga Milton Carlos, Honório Heitor Marques, Valle Accácio Lins do, Vidotti Hugo Alberto
University of Southern Santa Catarina, Tubarão, SC, Brazil.
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
J Appl Oral Sci. 2014 Sep-Oct;22(5):390-6. doi: 10.1590/1678-775720130466. Epub 2014 Jul 4.
The purpose of this study was to assess the push-out bond strength of glass fiber posts to root dentin after cementation with glass ionomer (GICs) and resinmodified glass ionomer cements (RMGICs).
Fifty human maxillary canines were transversally sectioned at 15 mm from the apex. Canals were prepared with a step back technique until the application of a #55 K-file and filled. Post spaces were prepared and specimens were divided into five groups according to the cement used for post cementation: Luting & Lining Cement; Fuji II LC Improved; RelyX Luting; Ketac Cem; and Ionoseal. After cementation of the glass fiber posts, all roots were stored at 100% humidity until testing. For push-out test, 1-mm thick slices were produced. The push-out test was performed in a universal testing machine at a crosshead speed of 0.5 mm/minute and the values (MPa) were analyzed by Kolmogorov-Smirnov and Levene's tests and by two-way ANOVA and Tukey's post hoc test at a significance level of 5%.
Fiber posts cemented using Luting & Lining Cement, Fuji II LC Improved, and Ketac Cem presented the highest bond strength to root dentin, followed by RelyX Luting. Ionoseal presented the lowest bond strength values (P>0.05). The post level did not influence the bond strength of fiber posts to root dentin (P=0.148). The major cause of failure was cohesive at the cement for all GICs and RMGICs.
Except for Ionoseal, all cements provided satisfactory bond strength values.
本研究旨在评估玻璃纤维桩用玻璃离子水门汀（GICs）和树脂改性玻璃离子水门汀（RMGICs）粘结后与牙根牙本质之间的推出粘结强度。
将50颗人上颌尖牙从根尖处横向截开15mm。采用逐步后退技术预备根管，直至使用#55 K锉并完成充填。制备桩道，根据用于桩粘结的水门汀将标本分为五组：粘结衬层水门汀；富士II LC改进型；RelyX粘结剂；Ketac Cem；以及Ionoseal。玻璃纤维桩粘结后，所有牙根在100%湿度下储存直至测试。对于推出试验，制作1mm厚的切片。在万能试验机上以0.5mm/分钟的十字头速度进行推出试验，并通过Kolmogorov-Smirnov检验、Levene检验、双向方差分析和Tukey事后检验分析数值（MPa），显著性水平为5%。
使用粘结衬层水门汀、富士II LC改进型和Ketac Cem粘结的纤维桩与牙根牙本质之间呈现出最高的粘结强度，其次是RelyX粘结剂。Ionoseal的粘结强度值最低（P>0.05）。桩的高度不影响纤维桩与牙根牙本质之间的粘结强度（P=0.148）。所有GICs和RMGICs粘结失败的主要原因是水门汀内聚破坏。
除Ionoseal外，所有水门汀均提供了令人满意的粘结强度值。
