Thio-urethane oligomers improve the properties of light-cured resin cements

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

Abstract

Thio-urethanes 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 10-30 phr to BisGMA-UDMA-TEGDMA (5:3:2, BUT). 25 wt% silanated inorganic fillers were added. Commercial cement (Relyx Veneer, 3M-ESPE) was also evaluated with 10-20 phr of aromatic oligomer. Near-IR was used to follow methacrylate conversion (DC) and rate of polymerization (Rpmax). Mechanical properties were evaluated in three-point bending (ISO 4049) for flexural strength/modulus (FS/FM, and toughness), and notched specimens (ASTM Standard E399-90) for fracture toughness (KIC). Polymerization stress (PS) was measured on the Bioman. Volumetric shrinkage (VS, %) was measured with the bonded disk technique. Results were analyzed with ANOVA/Tukey's test (α=5%). In general terms, for BUT cements, conversion and mechanical properties in flexure increased for selected groups with the addition of thio-urethane oligomers. The aromatic versions resulted in greater FS/FM than aliphatic. Fracture toughness increased by two-...Continue Reading

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Citations

Jan 15, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Atais BacchiCarmem 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
Jan 31, 2020·Biomaterial Investigations in Dentistry·Lourenço Correr-SobrinhoCarmem S Pfeifer
Feb 21, 2019·Scientific Reports·Ana P FugolinCarmem S Pfeifer
Dec 18, 2020·Brazilian Oral Research·Larissa Maria CavalcanteLuis Felipe Jochims Schneider
Dec 2, 2020·Materials Science & Engineering. C, Materials for Biological Applications·M GoulartC S Pfeifer
Nov 5, 2020·Brazilian Dental Journal·Rafael Leonardo Xediek ConsaniCarmem S Pfeifer
Oct 3, 2018·Materials Science & Engineering. C, Materials for Biological Applications·Mobin YahyazadehfarJirun Sun
Sep 10, 2020·International Journal of Adhesion & Adhesives·J Puppin-RontaniC S Pfeifer
Apr 9, 2021·Scientific Reports·Ana Paula Piovezan FugolinCarmem Silvia Pfeifer
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
Jul 9, 2020·Dental Materials : Official Publication of the Academy of Dental Materials·André L Faria-E-Silva, Carmem S Pfeifer
Oct 11, 2019·Journal of Dentistry·Patricia FrankenVicente Castelo Branco Leitune

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