Thermal annealed silk fibroin membranes for periodontal guided tissue regeneration
Guided tissue regeneration (GTR) is a surgical procedure applied in the reconstruction of periodontal defects, where an occlusive membrane is used to prevent the fast-growing connective tissue from migrating into the defect. In this work, silk fibroin (SF) membranes were developed for periodontal guided tissue regeneration. Solutions of SF with glycerol (GLY) or polyvinyl alcohol (PVA) where prepared at several weight ratios up to 30%, followed by solvent casting and thermal annealing at 85 °C for periods of 6 and 12 h to produce high flexible and stable membranes. These were characterized in terms of their morphology, physical integrity, chemical structure, mechanical and thermal properties, swelling capability and in vitro degradation behavior. The developed blended membranes exhibited high ductility, which is particular relevant considering the need for physical handling and adaptability to the defect. Moreover, the membranes were cultured with human periodontal ligament fibroblast cells (hPDLs) up to 7 days. Also, the higher hydrophilicity and consequent in vitro proteolytic degradability of these blends was superior to pure silk fibroin membranes. In particular SF/GLY blends demonstrated to support high cell adhesion and viability with an adequate hPDLs’ morphology, make them excellent candidates for applications in periodontal regeneration.
The authors acknowledge Portuguese National Funds from FCT - Fundação para a Ciência e a Tecnologia through project UID/Multi/50016/2013; Program FCT Investigators to A.L.Oliveira (IF/00411/2013) and J.M.Oliveira (IF/00423/2012 and IF/01285/2015); PhD scholarship under the financial support from FCT/MCTES and FSE/POCH, PD/59/2013 attributed to V.P.Ribeiro (PD/BD/113806/2015); Project SERICAMED (IF/00411/2013/CP1167); Project “IBEROS” (0245_IBEROS_1_E), funded by Fundo Europeu de Desenvolvimento Regional in the frame of Programa Interreg V A Espanha - Portugal (POCTEP) 2014–2020. This article is a result of the project “Biotherapies” (NORTE-01-0145-FEDER-000012) supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF).
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Conflict of interest
The authors declare that they have no conflict of interest.
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