An Optical System to Monitor the Displacement Field of Glass-fibre Posts Subjected to Thermal Loading

Massimo Corsalini1, Francesco Pettini1, Daniela Di Venere1, Andrea Ballini2, Giuseppe Chiatante3, Luciano Lamberti4, Carmine Pappalettere4, Michele Fiorentino4, Antonio E. Uva4, Giuseppe Monno4, Antonio Boccaccio4, *
1 Interdisciplinary Department of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy
2 Department of Basic Medical Sciences, Neurosciences and Sensory Organs, University of Bari Aldo Moro, 70124 Bari, Italy
3 School of Dentistry, University of Chieti “G. d’Annunzio”, 66100 Chieti, Italy
4 Department of Mechanics, Mathematics and Management, Politecnico di Bari, 70126 Bari, Italy

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© Corsalini et al.; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Mechanics, Mathematics and Management, DMMM, Politecnico di Bari, Viale Japigia 182, I-70126, Bari, Italy; Tel: +39 080 5962705; Fax: +39 080 5962777; E-mail: a.boccaccio@poliba.it


Endocanalar posts are necessary to build up and retain coronal restorations but they do not reinforce dental roots. It was observed that the dislodgement of post-retained restorations commonly occurs after several years of function and long-term retention may be influenced by various factors such as temperature changes. Temperature changes, in fact, produce micrometric deformations of post and surrounding tissues/materials that may generate high stress concentrations at the interface thus leading to failure.

In this study we present an optical system based on the projection moiré technique that has been utilized to monitor the displacement field of endocanalar glass-fibre posts subjected to temperature changes.

Measurements were performed on forty samples and the average displacement values registered at the apical and middle region were determined for six different temperature levels. A total of 480 displacement measurements was hence performed.

The values of the standard deviation computed for each of the tested temperatures over the forty samples appear reasonably small which proves the robustness and the reliability of the proposed optical technique. The possible implications for the use of the system in the applicative context were discussed.

Keywords: Dental materials, Endocanalar post, Projection moiré, Thermal deformation, Thermal stress.