Arenado Pernos

journal of dentistry 35 (2007) 496–502

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journal homepage: www.intl.elsevierhealth.com/journals/jden

The effect of sandblasting on adhesion of a dual-cured resin composite to methacrylic fiber posts: Microtensile bond strength and SEM evaluation
` Ivana Radovic a,b,*, Francesca Monticelli c, Cecilia Goracci b, Alvaro Hafiz Cury b,d, b a Ivanovic Coniglio ,Zoran R. Vulicevic , Franklin Garcia-Godoy e, Marco Ferrari b
Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia Department of Dental Materials and Restorative Dentistry, Policlinico ‘‘Le Scotte’’, University of Siena, Viale Bracci, Siena, Italy c Dental Materials, University of Granada, 18071 Granada, Spain d BauruDental School, University of Sao Paulo, Brazil ˜ e Bioscience Research Center, Biomaterials Research Center, and Clinical Research Center, College of Dental Medicine, Nova Southeastern University, 3200 South University Drive, Fort Lauderdale, FL 33328, United States
b a

article info
Article history: Received 28 June 2006 Received in revised form 24 January 2007 Accepted 26 January 2007abstract
Objectives: To evaluate the influence of different surface treatments on the microtensile bond strength of a dual-cured resin composite to fiber posts. Methods: Thirty-two glass methacrylate-based fiber posts (GC Corp.) were used in the study. Posts were divided into two groups, according to the surface pretreatment performed. Group 1: sandblasting (Rocatec-Pre, 3 M ESPE). Group 2: nopretreatment. In each of the two groups posts received three types of additional ‘‘chair-side’’ treatments. (1) Silane application (Monobond S, Ivoclar Vivadent); (2) adhesive application (Unifil Core self-etching bond,

Keywords: Fiber posts Microtensile bond strength Sandblasting Silane coupling

GC); (3) no treatment was performed. A dual-cured resin composite (Unifil Core, GC) was applied on theposts to produce cylindrical specimens. Specimens were cut to obtain microtensile sticks that were loaded in tension at a cross-head speed of 0.5 mm/min until failure. The morphology of the post/composite interface and the post surface morphology were evaluated under SEM. Statistical analysis was performed with two-way ANOVA and Tukey test for post hoc comparisons ( p < 0.05). Results: Post surfacepretreatment did not prove to be a significant factor in post-composite bond strength ( p = 0.08), whereas ‘‘chair-side’’ treatment modalities and the interaction between pretreatment and treatment showed a significant influence on bond strength ( p < 0.001). When no ‘‘chair-side’’ treatment was performed, bond strength was significantly higher on sandblasted posts. Additional adhesive applicationresulted in significantly lower bond strength on sandblasted posts. When no pretreatment was performed, silane application resulted in higher bond strength than adhesive application. Conclusions: Sandblasting may give an increase in microtensile strength to methacrylatebased glass fiber posts, eliminating the need for additional ‘‘chair-side’’ treatments. Reducing the number of clinical steps couldcontribute to simplify the clinical procedures. # 2007 Elsevier Ltd. All rights reserved.

* Corresponding author at: Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia. Tel.: +381 112684581. E-mail address: ivana.radovic@iritel.com (I. Radovic). 0300-5712/$ – see front matter # 2007 Elsevier Ltd. All rights reserved.doi:10.1016/j.jdent.2007.01.009

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Introduction

Reconstructing endodontically treated teeth with prefabricated fiber post and core systems has been widely accepted as a treatment option offering both esthetics and function.1,2 The advantages of fiber post and core restorations have been demonstrated in in vitro studies.3–9 These systems...