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Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites

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2016
Authors
Manojlović, Dragica
Dramićanin, Miroslav
Milosevic, Milos
Zeković, Ivana Lj.
Cvijović-Alagić, Ivana
Mitrovic, Nenad
Miletic, Vesna
Article
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Abstract
This study investigated the degree of conversion, depth of cure, Vickers hardness, flexural strength, flexural modulus and volumetric shrinkage of experimental composite containing a low shrinkage monomer FIT-852 (FIT; Esstech Inc.) and photoinitiator 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO; Sigma Aldrich) compared to conventional composite containing Bisphenol A-glycidyl methacrylate (BisGMA) and camphorquinone-amine photoinitiator system. The degree of conversion was generally higher in FIT-based composites (45-64% range) than in BisGMA-based composites (34-58% range). Vickers hardness, flexural strength and modulus were higher in BisGMA-based composites. A polywave light-curing unit was generally more efficient in terms of conversion and hardness of experimental composites than a monowave unit. FIT-based composite containing TPO showed the depth of cure below 2 mm irrespective of the curing light. The depth of cure of FIT-based composite containing CQ and BisGMA-based com...posites with either photoinitiator was in the range of 2.8-3.0 mm. Volumetric shrinkage of FIT-based composite (0.9-5.7% range) was lower than that of BisGMA-based composite (2.2-12% range). FIT may be used as a shrinkage reducing monomer compatible with the conventional CQ-amine system as well as the alternative TPO photoinitiator. However, the depth of cure of FIT_TPO composite requires boosting to achieve clinically recommended thickness of 2 mm. (C) 2015 Elsevier B.V. All rights reserved.

Keywords:
Composite / Dimethacrylate / Low shrinkage monomer / Degree of conversion / Mechanical properties / Lucirin TPO
Source:
Materials Science and Engineering. C: Materials for Biological Applications, 2016, 58, 487-494
Projects:
  • Development and Application of Methods and Materials for Monitoring New Organic Contaminants, Toxic Compounds and Heavy Metals (RS-172007)

DOI: 10.1016/j.msec.2015.08.054

ISSN: 0928-4931 (print); 1873-0191 (electronic)

PubMed: 26478336

WoS: 000364247500057

Scopus: 2-s2.0-84941353433
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URI
http://vinar.vin.bg.ac.rs/handle/123456789/798
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