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Polymerization Shrinkage Evaluation of Restorative Resin-Based Composites Using Fiber Bragg Grating Sensors

1
Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Areião, Piracicaba–SP 13414-903, Brazil
2
Institute of Operative Dentistry, Dentistry Area, Faculty of Medicine, University of Coimbra, Avenida Bissaya Barreto, Blocos de Celas, 3700-075 Coimbra, Portugal
3
Instituto de Telecomunicações, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
4
Instituto Português de Medicina Dentária, Rua José Luciano Castro, 141, Esgueira, 3800-207 Aveiro, Portugal
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 859; https://doi.org/10.3390/polym11050859
Received: 22 March 2019 / Revised: 3 May 2019 / Accepted: 6 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Materials and Methods for New Technologies in Polymer Processing)
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Abstract

The purpose of this study was to compare the linear polymerization shrinkage of different restorative resin-based composites (RBCs) using fiber Bragg grating (FBG) sensors. Five RBCs were evaluated: Zirconfill® (ZFL); Aura Bulk-Fill (ABF); Tetric® N-Ceram Bulk-Fill (TBF); FiltekTM Bulk-Fill (FBF); and Admira Fusion-Ormocer® (ADF). Ten samples per resin were produced in standardized custom-made half-gutter silicone molds. Two optical FBG sensors were used to assess temperature and polymerization shrinkage. Light curing was performed for 40 s and polymerization shrinkage was evaluated at 5, 10, 40, 60, 150, and 300 s. Statistical analysis was accomplished for normal distribution (Shapiro-Wilk, p > 0.05). Two-way repeated measures ANOVA with Greenhouse-Geisser correction followed by Bonferroni′s post-hoc test was used to analyze the linear shrinkage data (p < 0.05). ZFL showed the highest linear shrinkage and ADF the lowest. Shrinkage increased for all RBCs until 300 s, where significant differences were found between ADF and all other resins (p < 0.05). Among bulk-fill RBCs, TBF showed the lowest shrinkage value, but not statistically different from FBF. The ADF presented lower linear shrinkage than all other RBCs, and restorative bulk-fill composites exhibited an intermediate behavior. View Full-Text
Keywords: resin based-composites; bulk-fill composite resins; light curing; polymerization shrinkage; optical fiber sensors; fiber Bragg gratings resin based-composites; bulk-fill composite resins; light curing; polymerization shrinkage; optical fiber sensors; fiber Bragg gratings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Lins, R.; Vinagre, A.; Alberto, N.; Domingues, M.F.; Messias, A.; Martins, L.R.; Nogueira, R.; Ramos, J.C. Polymerization Shrinkage Evaluation of Restorative Resin-Based Composites Using Fiber Bragg Grating Sensors. Polymers 2019, 11, 859.

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