Tri-layered functionally graded membrane for potential application in periodontal regeneration.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Guided tissue regeneration (GTR) membranes are crucial for bone defect repair.
• Current membranes often lack optimal surface properties for cell interaction and bone regeneration.

Purpose of the Study:

• To develop and characterize a novel tri-layered, functionally-graded chitosan membrane (FGM) with a bioactive glass (BG) gradient.
• To evaluate the in vitro and in vivo biocompatibility and cell interaction of the developed FGM for GTR applications.

Main Methods:

• Lyophilization technique used to fabricate a tri-layered FGM with varying BG concentrations (50%, 25%, 0%).
• Scanning Electron Microscopy (SEM) for surface morphology analysis.
• Contact angle measurements to assess surface hydrophilicity/hydrophobicity.
• In vitro cell culture (MC3T3-E1 pre-osteoblasts, fibroblasts) using Alamar blue assay.
• In vivo implantation and histological analysis (Hematoxylin and eosin staining).

Main Results:

• SEM confirmed distinct porous (lower layer) and non-porous (upper layer) surface structures.
• Hydrophilic (≈0°) and hydrophobic (91°) surfaces were achieved, correlating with BG content.
• Optimal cell adhesion and proliferation observed on the lower, BG-containing layers (in vitro).
• No cell adhesion on the non-porous upper layer.
• In vivo studies confirmed the biocompatible nature of the FGM.

Conclusions:

• The developed tri-layered FGM exhibits tunable surface properties and excellent biocompatibility.
• The gradient design promotes targeted cell interaction and proliferation, suitable for GTR.
• These FGMs show significant potential as effective carriers for in vivo implantation in bone regeneration.