Light transmission through fiber post: The effect on adhesion, elastic modulus and hardness of dual-cure resin cement

Radovic, Ivana; Corciolani, Gabriele; Magni, Elisa; Krstanovic, Goranka; Pavlovic, Vladimir; Vulicevic, Zoran R.; Ferrari, Marco

doi:10.1016/j.dental.2009.01.004

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Volume 25, Issue 7 , Pages 837-844, July 2009

Light transmission through fiber post: The effect on adhesion, elastic modulus and hardness of dual-cure resin cement

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; fax: +381 112685361.
Gabriele Corciolani
- 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
- Department of Restorative Dentistry and Periodontology, Dental School of the Ludwig-Maximilians University, Goethestrasse 70, D-80336 Munich, Germany
Goranka Krstanovic
- Clinic for Pediatric and Preventive Dentistry, Faculty of Dentistry, University of Belgrade, Dr. Subotica 11, Beograd 11000, Serbia
Vladimir Pavlovic
- Department of Physics, Faculty of Agriculture, University of Belgrade, Serbia
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 29 July 2008; received in revised form 8 November 2008; accepted 9 January 2009.

Abstract

Objectives

The aim of this study was to investigate the effect of fiber post light transmitting ability to the continuity of resin cement-root dentin (C-RD) and resin cement-fiber post (C-FP) interface, elastic modulus and hardness of a dual-cure resin cement.

Methods

Spectrophotometric measurements were applied for the determination of light transmission at coronal, middle and apical level as well as at the apical tip through Tech 21 X-OP (TECH) and DT Light Post (DT). Posts were cemented using dual-cured resin cement (Calibra). Roots were sectioned longitudinally through the post. Epoxy resin replicas were made and used to evaluate C-RD and C-FP interface under SEM. Modulus of elasticity (E) and Vicker's hardness (VH) of the cement layer were assessed.

Results

No light transmission was detected through TECH. Light transmission through DT decreased from coronal to apical and rose at the apical tip. TECH presented a significantly lower percentage of continuous C-RD and C-FP interface in comparison to DT. Coronal third of C-RD interface in TECH specimens had a significantly higher percentage of continuity than apical third. No regional differences in continuity of C-RD interface were found in DT specimens. E and VH were significantly lower when TECH was used, and decreased from coronal to apical for both posts.

Significance

Cementation of fiber post with no light transmitting ability using a dual-cured resin cement resulted in lower E and VH of the cement layer, and lower percentage of continuous C-RD and C-FP interface in comparison to cementation of light transmitting fiber post.

Keywords: Fiber post, Light transmission, Root dentin adhesion, Elastic modulus, Vicker's hardness