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ORIGINAL ARTICLE
Year : 2013  |  Volume : 3  |  Issue : 2  |  Page : 112-118

Resin push-out bond between fiber post and root dentin: Evaluation of different cementation approaches


1 Department of Restorative Dentistry, Development Foundation from Bahia, Salvador, Brazil
2 Department of Restorative Dentistry, Division of Prosthodontics, Federal University of Santa Maria, Santa Maria, Brazil
3 Department of Restorative Dentistry, Division of Prosthodontics, Federal University of Paraiba, Joao Pessoa, Brazil

Correspondence Address:
Rodrigo O. A. Souza
Federal University of Paraíba, School of Dentistry, Department of Restorative Dentistry, Rua Praia de Guajirú, 9215, Ponta Negra, CEP: 59.092-220, Natal/ Rio Grande do Norte
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2278-9596.122929

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Background: Resin push-out bond between fiber post and root dentin can be achieved in various ways. This study evaluates the bond strength of glass fiber posts cemented into root canal using different luting techniques. The null hypothesis tested was that no difference would be observed among the strategies for post cementation. Materials and Methods: The canals of 50 roots were prepared with the custom drill of glass fiber post and divided into five groups (n = 10), according to the strategy for post cementation: G1- conventional adhesive procedure (single-bottle etch and rinse light-cured adhesive + resin cement (Relyx ARC)); G2- conventional adhesive procedure (single-bottle etch and rinse light-cured adhesive + resin cement (AllCeram); G3- self-adhesive resin cement (Relyx Unicem, 3M/ESPE); G4- self-adhesive resin cement (Relyx Unicem, 3M/ESPE) with previous dentin acid etching; and G5- resin glass ionomer cement (Relyx Luting 2, 3M/ESPE). After post cementation, the specimens were kept for 24 h in 100% humidity. Afterwards, each root was sectioned into 2 mm slices to be pushed-out. The data were submitted to one-way analysis of variance (ANOVA) and Tukey's test (5%). Failure analyses were followed after testing. Results: The self-adhesive resin cement with dentin acid pretreatment (G4: 22.3 ± 2.8) had the highest bond strength values (MPa) (G3: 16.3 ± 4.4 > G1: 7.0 ± 3.9 > G2: 4.9 ± 2.5 > G5: 3.7 ± 2.2) (P < 0.05). This was followed by the same cement without phosphoric acid etching. The other three groups obtained the significantly lowest mean values and were similar to each other. Conclusion: Simplified self-adhesive resin cement promoted the highest bond strength when compared to conventional adhesive cementation and glass ionomer.


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