The effect of sandblasting on adhesion of a dual-cured resin composite to methacrylic fiber posts: Microtensile bond strength and SEM evaluation

Radovic, Ivana; Monticelli, Francesca; Goracci, Cecilia; Cury, Àlvaro Hafiz; Coniglio, Ivanovic; Vulicevic, Zoran R.; Garcia-Godoy, Franklin; Ferrari, Marco

doi:10.1016/j.jdent.2007.01.009

« Previous Next »Journal of Dentistry
Volume 35, Issue 6 , Pages 496-502, June 2007

The effect of sandblasting on adhesion of a dual-cured resin composite to methacrylic fiber posts: Microtensile bond strength and SEM evaluation

Ivana Radovic
- 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
- Corresponding author at: Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia. Tel.: +381 112684581.
Francesca Monticelli
- Dental Materials, University of Granada, 18071 Granada, Spain
Cecilia Goracci
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy
Àlvaro Hafiz Cury
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy
- Bauru Dental School, University of São Paulo, Brazil
Ivanovic Coniglio
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy
Zoran R. Vulicevic
- Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia
Franklin Garcia-Godoy
- 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
Marco Ferrari
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy

Received 28 June 2006; received in revised form 24 January 2007; accepted 26 January 2007.

Abstract

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, 3M ESPE). Group 2: no pretreatment. 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, GC); (3) no treatment was performed. A dual-cured resin composite (Unifil Core, GC) was applied on the posts to produce cylindrical specimens. Specimens were cut to obtain microtensile sticks that were loaded in tension at a cross-head speed of 0.5mm/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 surface pretreatment 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 application resulted 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 methacrylate-based glass fiber posts, eliminating the need for additional “chair-side” treatments. Reducing the number of clinical steps could contribute to simplify the clinical procedures.

Keywords: Fiber posts, Microtensile bond strength, Sandblasting, Silane coupling