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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

he use of an elastomeric methacrylate monomer (Exothane 24) to reduce the polymerization shrinkage stress and improve the two-body wear resistance of bulk fill composite

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Author(s):
Rocha, Mateus Garcia [1] ; de Oliveira, Dayane Carvalho Ramos Salles [1] ; de Menezes, Livia Rodrigues [2] ; Roulet, Jean-Francois [1] ; Sinhoreti, Mario Alexandre Coelho [3] ; Correr, Americo Bortolazzo [3]
Total Authors: 6
Affiliation:
[1] Univ Florida, Coll Dent, Dept Restorat Dent Sci, Ctr Dent Biomat, 1395 Ctr Dr Room D9-6, Gainesville, FL 32610 - USA
[2] Univ Fed Rio de Janeiro, Inst Macromol Prof Eloisa Mano, Rio De Janeiro - Brazil
[3] Univ Estadual Campinas, Piracicaba Dent Sch, Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Dental Materials; v. 38, n. 2, p. E43-E57, FEB 2022.
Web of Science Citations: 0
Abstract

Objectives: Characterize the chemical structure of an elastomeric monomer (Exothane 24) and evaluate the degree of conversion (DC), polymerization shrinkage stress (PSS), rate of polymerization (Rp), flexural strength (F-Stenght), flexural modulus (F-Modulus), Vickers hardness (V-Hardness) and two-body wear resistance of dental bulk fill composites (BFCs) containing Exothane 24. Methods: The Exothane 24 was characterized using mass spectroscopy, elemental analysis, C-13- and H-1 NMR. BFCs were formulated containing Exothane 24 (E10, E25, and E50). Similar BFCs containing regular UDMA (U10, U25, and U50), commercial conventional, and BFCs were used as control groups. ATR-FTIR spectroscopy was used to measure DC and the Rp of the composites. The PSS was measured using the universal testing machine method. Specimen bars were used to assess the F-Strenght, F-Modulus, and V-Hardness. RBCs were submitted to a two-body wear test using a chewing simulator machine; the rate and volumetric wear loss were evaluated using an optical scanner. Data were analyzed statistically with alpha = 0.05 and beta = 0.2. Results: Exothane 24 is a urethane isophorone tetramethyl methacrylate monomer with polymerization stress-relieving properties. No differences were found in the DC up to 4 mm in depth for E25. All BFCs had similar F-Strenght, except for E50. E25 had the lowest volumetric wear loss and wear rate. E25 had approximately 30% lower PSS and slower Rp than commercial BFCs with similar wear resistance to conventional commercial composites. Significance: The Exothane 24 reduced the PSS and increased the wear resistance of BFCs; however, the formulation is important to optimize the properties of the BFCs. (C) 2021 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 17/22195-9 - Development and characterization of bulk fill composites light cured using silver nanoparticles surface plasmon resonance as a photoinitiator system
Grantee:Mateus Garcia Rocha
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/05823-3 - LOW INTENSITY LIGHT-CURING UNITS AND PHOTOINITIATION SYSTEMS ACTIVATED UNDER WAVELENGHS IN BETWEEN 495-750 NM FOR DENTAL RESIN MATERIALS
Grantee:Dayane Carvalho Ramos Salles de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/22161-7 - Development and characterization of dental resin materials photoactivated under WAVELENGHS between 495 and 750 nm
Grantee:Dayane Carvalho Ramos Salles de Oliveira
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor