Periodontal GTR membranes: limitations and possible solutions for the bottleneck analysis.

Guided tissue regeneration (GTR) is an important surgical method for periodontal regeneration. By placing barrier membrane on the root surface of the tooth to guide the adhesion and proliferation of periodontal ligament cells, periodontal tissue regeneration can be achieved. This review intends to analyze the current limitations of GTR membranes and to propose possible solutions for developing new ones. Limitations of current GTR membranes include: Nonabsorbable membranes and absorbable synthetic polymer membranes exhibit weak biocompatibility; When applying to a large defect wound, the natural collagen membrane with fast degradation rate have limited mechanical strength, and the barrier function may not be maintained well. Although the degradation time can be prolonged after cross-linking, it may cause foreign body reaction and affect tissue integration; The clinical operation of current barrier membranes is inconvenient. In addition, most of the barrier membranes lack bioactivity and will not actively promote periodontal tissue regeneration. Possible solutions include using electrospinning techniques, nanofiber scaffolds, or developing functional gradient membranes to improve their biocompatibility; Adding Mg, Zn and/or other metal alloys, or using 3D printing technology to improve their mechanical strength; Increasing the concentration of nanoparticles or using directional arrangement of membrane fibers to control the fiber diameter and porosity of the membrane, which can improve their barrier function; Mixing natural and synthetic polymers as well as other biomaterials with different degradation rates in proportion to change the degradation rate and maintain barrier function; To improve the convenience of clinical operation, barrier membranes that meets personalized adhesion to the wound defect can be manufactured; Developing local controlled release drug delivery systems to improve their bioactivity.