Journal of Materials Science: Materials in Medicine (2019)30:27 https://doi.org/10.1007/s10856-019-6225-y TISSUE ENGINEERING CONSTRUCTS AND CELL SUBSTRATES Original Research Thermal annealed silk fibroin membranes for periodontal guided tissue regeneration Catarina Geão 1,2 ● Ana R. Costa-Pinto 1 ● Cassilda Cunha-Reis 1 ● Viviana P. Ribeiro 2,3 ● Sílvia Vieira 2,3 ● Joaquim M. Oliveira 2,3,4 ● Rui L. Reis 2,3,4 ● Ana L. Oliveira 1 Received: 8 November 2018 / Accepted: 24 January 2019 © Springer Science+Business Media, LLC, part of Springer Nature 2019 Abstract 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. Graphical Abstract * Ana L. Oliveira aloliveira@porto.ucp.pt 1 CBQF–Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Arquiteto Lobão Vital, 4200-072 Porto, Portugal 2 3B’s Research Group, I3Bs–Research Institute on Biomaterials, Biodegradable and Biomimetics, Headquarters of the European Institute of Excellence on tissue Engineering and Regenerative Medicine, AvePark, 4805-17 Barco, Guimarães, Portugal 3 ICVS/3B’s–PT Government Associated Laboratory, Braga/ Guimarães, Portugal 4 The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, 4805-017 Barco, Guimarães, Portugal 1234567890();,: 1234567890();,: