Accelerated aging of adhesive-mediated fiber post-resin composite bonds: A modeling approach

Radovic, Ivana; Monticelli, Francesca; Papacchini, Federica; Magni, Elisa; Cury, Àlvaro Hafiz; Vulicevic, Zoran R.; Ferrari, Marco

doi:10.1016/j.jdent.2007.05.006

« Previous Next »Journal of Dentistry
Volume 35, Issue 8 , Pages 683-689, August 2007

Accelerated aging of adhesive-mediated fiber post-resin composite bonds: A modeling approach

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
Federica Papacchini
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy
Elisa Magni
- 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
Zoran R. Vulicevic
- Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia
Marco Ferrari
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, Siena, Italy

Received 12 January 2007; received in revised form 11 May 2007; accepted 15 May 2007.

Abstract

Objectives

Although fiber posts luted in root canals are not directly exposed to oral fluids, water storage is considered as in vitro accelerated aging test for bonded interfaces. The aim of the study was to evaluate the influence of accelerated water aging on fiber post-resin composite adhesion.

Methods

Forty fiber posts (DT Light Post, RTD) were randomly divided into two main groups, according to the surface treatment performed. Group I: XPBond adhesive (Dentsply Caulk); Group II: sandblasting (Rocatec-Pre, 3M ESPE) and XPBond. Dual-cured resin cement (Calibra, Dentsply Caulk) and flowable composite (X-Flow, Dentsply Caulk) were applied on the posts to produce cylindrical specimens. The bond strength at the interface between post and cement/composite was measured with the microtensile test according to the non-trimming technique. Half of the sticks were tested immediately for bond strength, while in the other half testing was performed after 1 month of water storage at 37°C. Post-cement/composite interfaces were evaluated under SEM prior and after water aging. Statistical analysis was performed using the Kruskal–Wallis ANOVA followed by Dunn's multiple range test (p<0.05).

Results

Immediate bond strength was higher on sandblasted posts. After water aging the two post surface treatments resulted comparable in bond strength. Resin cement achieved higher bond strength to fiber posts than flowable composite. Water aging significantly reduced bond strength.

Conclusions

Sandblasting followed by adhesive coating may improve immediate post-resin bond strength in comparison to adhesive alone. However, fiber post-resin bond strength mediated by hydrophilic adhesive tends to decrease after water aging.

Keywords: Fiber posts, FRC, Resin cement, Flowable composite, Bond strength, Water aging, Sandblasting