Characterization of methacrylate-based composites containing thio-urethane oligomers

Dental Materials : Official Publication of the Academy of Dental Materials
A BacchiCarmem S Pfeifer

Abstract

To evaluate the ability of thio-urethane oligomers to improve the properties of restorative composite resins. Oligomers were synthesized by combining 1,6-hexanediol-diissocyante (aliphatic) with pentaerythritol tetra-3-mercaptopropionate (PETMP) or 1,3-bis(1-isocyanato-1-methylethyl)benzene (aromatic) with trimethylol-tris-3-mercaptopropionate (TMP), at 1:2 isocyanate:thiol, leaving pendant thiols. Oligomers were added at 0-20 wt% to BisGMA-TEGDMA (70-30 wt%). Silanated inorganic fillers were added (70 wt%). Materials were photoactivated at 800 mW/cm(2) filtered to 320-500 nm. Near-IR was used to follow degree of methacrylate conversion (DC). Mechanical properties were evaluated in three-point bending with 2 mm × 2 mm × 25 mm bars for flexural strength/modulus and toughness (FS/E, and T) according to ISO 4049, and 2 mm × 5 mm × 25 mm notched specimens for fracture toughness (KIC). Polymerization stress (PS) was measured on the Bioman. Results were analyzed with ANOVA/Tukey's test (α=5%). Significant increase in DC was observed in thio-urethane-containing materials especially for the group with 20 wt% of aliphatic version. Materials composed by oligomers also promoted higher FS, E, and KIC in comparison to controls irrespective ...Continue Reading

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Citations

Jul 22, 2017·Journal of Dental Research·A P P Fugolin, C S Pfeifer
Nov 6, 2018·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Atais BacchiCarmem Silvia Pfeifer
Dec 7, 2018·Journal of Biomaterials Science. Polymer Edition·Shuzhen LuoJingwei He
May 6, 2019·Journal of Dental Research·B M FronzaJ W Stansbury
May 3, 2020·Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology·Sydney D Menikheim, Erin B Lavik
Feb 21, 2019·Scientific Reports·Ana P FugolinCarmem S Pfeifer
Sep 14, 2017·Brazilian Oral Research·Carlos José SoaresAntheunis Versluis
Jan 31, 2020·Biomaterial Investigations in Dentistry·Lourenço Correr-SobrinhoCarmem S Pfeifer
Dec 18, 2020·Brazilian Oral Research·Larissa Maria CavalcanteLuis Felipe Jochims Schneider
Mar 10, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Hamad AlgamaiahDavid C Watts
Apr 23, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·A P P FugolinC S Pfeifer
May 25, 2020·Dental Materials : Official Publication of the Academy of Dental Materials·M C G ErhardtC S Pfeifer

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