Covalent adaptable networks as dental restorative resins: stress relaxation by addition-fragmentation chain transfer in allyl sulfide-containing resins.

Dental Materials : Official Publication of the Academy of Dental Materials
Hee Young ParkC N Bowman

Abstract

The aim is to demonstrate significant polymerization shrinkage stress reduction in model resins through incorporation of addition-fragmentation chain transfer moieties that promote network stress accommodation by molecular rearrangement. Monomers containing allyl sulfide linkages are incorporated to affect the shrinkage stress that arises during photopolymerization of model resins that contain an initiator and dimethacrylates. Radical-mediated allyl sulfide addition-fragmentation is enabled during polymerization. We hypothesize that allyl sulfide incorporation into methacrylate polymerizations promotes stress relaxation by enabling network adaptation. A 1:2 mixture of tetrathiol and allyl sulfide-containing divinyl ethers is formulated with glass-forming dimethacrylates and compared to controls where the allyl sulfide is replaced with a propyl sulfide that is incapable of undergoing addition-fragmentation. Simultaneous shrinkage stress and functional group conversion measurements are performed. The T(g) is determined by DMA. Increasing allyl sulfide concentration reduces the relative stress by up to 75% in the resins containing the maximum amount of allyl sulfide. In glassy systems, at much lower allyl sulfide concentrations, t...Continue Reading

Citations

Dec 4, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Julian G LeprinceGaetane Leloup
Sep 22, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Hee Young ParkChristopher N Bowman
May 23, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Hee Young ParkChristopher N Bowman
Dec 24, 2011·Dental Materials : Official Publication of the Academy of Dental Materials·Jeffrey W Stansbury
Oct 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Han Byul SongChristopher N Bowman
Apr 8, 2017·ACS Applied Materials & Interfaces·Lewis Michael CoxYifu Ding
Sep 14, 2017·Brazilian Oral Research·Carlos José SoaresAntheunis Versluis
Feb 13, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Parag K Shah, Jeffrey W Stansbury
Mar 20, 2018·Dental Materials : Official Publication of the Academy of Dental Materials·William M PalinMohammed A Hadis
Jan 5, 2014·Chemical Reviews·Fabrice DénèsPhilippe Renaud

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