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Open AccessArticle

Evaluation of the Degree of Conversion, Residual Monomers and Mechanical Properties of Some Light-Cured Dental Resin Composites

Department of Polymer Composites, Babes-Bolyai University, Institute of Chemistry Raluca Ripan, 30 Fantanele Str., 400294 Cluj-Napoca, Romania
Department of Psychology, Babes-Bolyai University, 37 Republicii Street, 400015 Cluj-Napoca, Romania
Department of Periodontology, Iuliu Haţieganu University of Medicine and Pharmacy, 15 V. Babes St., 400012 Cluj-Napoca, Romania
Department of Horticulture and Food Science, University of Craiova, 13 Al. I. Cuza Str., 200585 Craiova, Romania
Faculty of Medicine, University Lucian Blaga Sibiu, 2A Lucian Blaga Str., 550169 Sibiu, Romania
Department Orthoped & Traumatol, Clinical Emergency Hospital Bucharest, 8 Floreasca Ave, Sect 1, 014461 Bucharest, Romania
Author to whom correspondence should be addressed.
Materials 2019, 12(13), 2109;
Received: 5 June 2019 / Revised: 26 June 2019 / Accepted: 27 June 2019 / Published: 30 June 2019
(This article belongs to the Special Issue Selected Papers from BIOMMEDD 2018 Conference—Biomaterials)
The novelty of this study consists in the formulation and characterization of three experimental dental composites (PM, P14M, P2S) for cervical dental lesion restoration compared to the commercial composites Enamel plus HRi® - En (Micerium S.p.A, Avengo, Ge, Italy), G-ænial Anterior® - Ge, (GC Europe N.V., Leuven, Belgium), Charisma® - Ch (Heraeus Kulzer, Berkshire, UK). The physio-chemical properties were studied, like the degree of conversion and the residual monomers in cured samples using FTIR-ATR (attenuated total reflectance) and HPLC-UV (ultraviolet detection), as well as the evaluation of the mechanical properties of the materials. The null hypothesis was that there would be no differences between experimental and commercial resin composites regarding the evaluated parameters. Statistical analysis revealed that water and saliva storage induced significant modifications of all mechanical parameters after three months for all tested materials, except for a few comparisons for each type of material. Storage medium seemed not to alter the values of mechanical parameters in comparison with the initial ones for: diametral tensile strength (DTS-saliva for Ge and PM, compressive strength (CS)-water for Ch, DTS-water and Young’s modulus YM-saliva for P14M and YM-water/ saliva for P2S (p > 0.05). Two of the experimental materials showed less than 1% residual monomers, which sustains good polymerization efficiency. Experimental resin composites have good mechanical properties, which makes them recommendable for the successful use in load-bearing surfaces of posterior teeth. View Full-Text
Keywords: composites; mechanical properties; degree of conversion; FTIR composites; mechanical properties; degree of conversion; FTIR
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Moldovan, M.; Balazsi, R.; Soanca, A.; Roman, A.; Sarosi, C.; Prodan, D.; Vlassa, M.; Cojocaru, I.; Saceleanu, V.; Cristescu, I. Evaluation of the Degree of Conversion, Residual Monomers and Mechanical Properties of Some Light-Cured Dental Resin Composites. Materials 2019, 12, 2109.

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