Glass fiber posts

Renata Pereira,Débora Alves Nunes Leite Lima,Luís Roberto Marcondes Martins,Rodrigo Barros Esteves Lins,Flávio Henrique Baggio Aguiar,Victória Castelan Rodrigues

doi:10.20396/bjos.v19i0.8657508

Glass fiber posts

Renata Pereira, Débora Alves Nunes Leite Lima + Show 4 more

Open Access

https://doi.org/10.20396/bjos.v19i0.8657508

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Abstract

Aim: Glass fiber posts are indicated in the rehabilitation of extensively damaged teeth; their cementation represents a critical step in restorative dentistry. The aim of this study was to quantify and compare the push-out bond strength of glass fiber posts cemented by conventional technique, two-step technique with luting agent and two-step technique associating bulk-fill composite and luting agent. Methods: Eighty maxillary bovine incisors were endodontically treated and divided into eight groups (n = 10) according to the luting agent (Rely X ARC and Duo-link) and cementation technique (conventional technique; two-step technique with luting agent; and two-step technique associating bulk-fill composite – Filtek Bulk-fill flow or Surefil SDR flow – and luting agent). Samples were submitted to pushout bond strength test, and the fracture pattern was evaluated through scanning electron microscope. Data were submitted to two-way ANOVA and Tukey’s test (α = 0.05). Results: When Rely X ARC was used, the conventional cementation technique obtained higher bond strength values than the twostep technique associated with Filtek Bulk-fill flow. When Duolink was used, the two-step technique associated with Filtek Bulk-fill flow presented higher bond strength values than the conventional technique. The most prevalent fracture patterns were adhesive between luting agent and dentin, and adhesive between bulk-fill composite and dentin. Conclusion: Two-step cementation technique associated with bulk-fill composite may be promising depending on the luting agent used.

Highlights

Glass fiber posts are indicated for the rehabilitation of extensively damaged teeth in order to ensure higher retention and support to restorative material, as well as better distribution of masticatory stresses[1,2,3,4]
The aim of this study was to quantify and compare the push-out bond strength of glass fiber posts cemented by a conventional technique, a two-step technique with luting agent and a two-step technique associating bulk-fill composite and luting agent
The working hypotheses tested were: (1) there would be significant differences in the bond strength of glass fiber posts cemented by different techniques; (2) two-step technique, either solely with luting agent or with bulk-fill composite and luting agent, would generate higher bond strength when compared to the conventional cementation technique

Summary

Introduction

Glass fiber posts are indicated for the rehabilitation of extensively damaged teeth in order to ensure higher retention and support to restorative material, as well as better distribution of masticatory stresses[1,2,3,4]. Defined first by Feilzer et al.[8] (1987) as the ratio between bonded and unbounded surfaces, the higher the C-factor value, the greater the stress at the adhesive interface. Cementation of fiber posts has been described as the worst possible scenario in relation to C-factor because of the geometric characteristics of the root canal. The root canal is figuratively a very deep class I cavity[9]. The surface to be cured is deep, reducing the stress relief capacity and increasing the challenge for adhesion

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