Pereira JR1, Rosa RA2, Só MV2, Afonso D1, Kuga MC3, Honório HM4, Valle AL5, Vidotti HA5.
1University of Southern Santa Catarina, Tubarão, SC, Brazil.
2Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
3Department of Endodontics, School of Dentistry, Univ. Estadual Paulista, Araraquara, SP, Brazil.
4Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
5Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
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).
MATERIAL AND METHODS:
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.
PMID: 25004052 [PubMed – as supplied by publisher] Icon for Scientific Electronic Library Online
1. J Appl Oral Sci. 2014 Jul 4;0:0. [Epub ahead of print]