title: Effects of a low-shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites.
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 2mm irrespective of the curing light. The depth of cure of FIT-based composite containing CQ and BisGMA-based composites with either photoinitiator was in the range of 2.8-3.0mm. 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 2mm.
authors.affiliation: University of Belgrade, School of Dental Medicine, DentalNet Research Group, 11000 Belgrade, Serbia.
authors.forename: Dragica
authors.initials: D
authors.lastname: Manojlovic
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Miroslav D
authors.initials: MD
authors.lastname: Dramićanin
authors.affiliation: University of Belgrade, Innovation center of Faculty of Mechanical Engineering, 11120 Belgrade, Serbia.
authors.forename: Milos
authors.initials: M
authors.lastname: Milosevic
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Zeković
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Cvijović-Alagić
authors.affiliation: University of Belgrade, Faculty of Mechanical Engineering, 11120 Belgrade, Serbia.
authors.forename: Nenad
authors.initials: N
authors.lastname: Mitrovic
authors.affiliation: University of Belgrade, School of Dental Medicine, DentalNet Research Group, 11000 Belgrade, Serbia. Electronic address: vesna.miletic@stomf.bg.ac.rs.
authors.forename: Vesna
authors.initials: V
authors.lastname: Miletic
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental; D055119:Elastic Modulus; D006244:Hardness; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C520678:(2,4,6-trimethylbenzoyl) diphenylphosphine oxide; D003188:Composite Resins; D008689:Methacrylates; D010087:Oxides; D010720:Phosphines; D011109:Polymethacrylic Acids; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate
keywords: Composite; Degree of conversion; Dimethacrylate; Low shrinkage monomer; Lucirin TPO; Mechanical properties