Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites
Introduction of thiourethane (TU) oligomer to resin-based dental restorative materials reduces stress and improves fracture toughness without compromising conversion. Localization of TU at the resin-filler interface via silanization procedures may lead to more substantial stress reduction and clinic...
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doaj-f5475e27fb8d4de5b98b14ec4eb3821f2020-11-26T13:31:49ZengElsevierMaterials & Design0264-12752021-01-01197109249Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental compositesS.H. Lewis0Fugolin APP1S. Lam2C. Scanlon3J.L. Ferracane4C.S. Pfeifer5Oregon Health & Science University, Department of Restorative Dentistry, Biomaterials and Biomechanics, United States of AmericaOregon Health & Science University, Department of Restorative Dentistry, Biomaterials and Biomechanics, United States of AmericaApprenticeships in Science and Engineering (ASE, Saturday Academy), United States of AmericaOregon Health & Science University, Department of Restorative Dentistry, Biomaterials and Biomechanics, United States of AmericaOregon Health & Science University, Department of Restorative Dentistry, Biomaterials and Biomechanics, United States of AmericaOregon Health & Science University, Department of Restorative Dentistry, Biomaterials and Biomechanics, United States of America; Corresponding author at: 2730 South Moody Ave, Portland, OR 97201, United States of America.Introduction of thiourethane (TU) oligomer to resin-based dental restorative materials reduces stress and improves fracture toughness without compromising conversion. Localization of TU at the resin-filler interface via silanization procedures may lead to more substantial stress reduction and clinical property enhancements. The objective of this study was to evaluate composite properties as a function of TU-functionalized filler concentration. TU oligomers were synthesized using click-chemistry techniques and subsequently silanized to barium glass filler. Resin-based composites were formulated using varying ratios of TU-functionalized filler and conventional methacrylate-silanized barium filler. Material property testing included thermogravimetric analysis, real-time polymerization kinetics and depth of cure, polymerization stress, stress relaxation and fracture toughness. Clinical property testing included water sorption/solubility, composite paste viscosity, and gloss and surface roughness measured before and after subjecting the samples to 6 h of continuous tooth brushing in a custom-built apparatus using a toothpaste/water mixture. Increasing TU-filler in the composite resulted in as much as a 78% reduction in stress, coupled with an increase in fracture toughness. Conversion was similar for all groups. After simulated tooth brushing, gloss reduction was lower for TU-containing composites and surface roughness was less than or equal to the control.http://www.sciencedirect.com/science/article/pii/S026412752030784XDimethacrylatesThiourethane oligomersDental compositesPolymerization stressFracture toughnessSurface properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
S.H. Lewis Fugolin APP S. Lam C. Scanlon J.L. Ferracane C.S. Pfeifer |
spellingShingle |
S.H. Lewis Fugolin APP S. Lam C. Scanlon J.L. Ferracane C.S. Pfeifer Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites Materials & Design Dimethacrylates Thiourethane oligomers Dental composites Polymerization stress Fracture toughness Surface properties |
author_facet |
S.H. Lewis Fugolin APP S. Lam C. Scanlon J.L. Ferracane C.S. Pfeifer |
author_sort |
S.H. Lewis |
title |
Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
title_short |
Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
title_full |
Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
title_fullStr |
Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
title_full_unstemmed |
Effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
title_sort |
effects of systematically varied thiourethane-functionalized filler concentration on polymerization behavior and relevant clinical properties of dental composites |
publisher |
Elsevier |
series |
Materials & Design |
issn |
0264-1275 |
publishDate |
2021-01-01 |
description |
Introduction of thiourethane (TU) oligomer to resin-based dental restorative materials reduces stress and improves fracture toughness without compromising conversion. Localization of TU at the resin-filler interface via silanization procedures may lead to more substantial stress reduction and clinical property enhancements. The objective of this study was to evaluate composite properties as a function of TU-functionalized filler concentration. TU oligomers were synthesized using click-chemistry techniques and subsequently silanized to barium glass filler. Resin-based composites were formulated using varying ratios of TU-functionalized filler and conventional methacrylate-silanized barium filler. Material property testing included thermogravimetric analysis, real-time polymerization kinetics and depth of cure, polymerization stress, stress relaxation and fracture toughness. Clinical property testing included water sorption/solubility, composite paste viscosity, and gloss and surface roughness measured before and after subjecting the samples to 6 h of continuous tooth brushing in a custom-built apparatus using a toothpaste/water mixture. Increasing TU-filler in the composite resulted in as much as a 78% reduction in stress, coupled with an increase in fracture toughness. Conversion was similar for all groups. After simulated tooth brushing, gloss reduction was lower for TU-containing composites and surface roughness was less than or equal to the control. |
topic |
Dimethacrylates Thiourethane oligomers Dental composites Polymerization stress Fracture toughness Surface properties |
url |
http://www.sciencedirect.com/science/article/pii/S026412752030784X |
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