Poly(3-hydroxybutyrate) (PHB) patches for covering anterior skull base defects – an animal study with minipigs

Conclusion: We conclude that PHB patch material may fulfil the specific requirements that are necessary for a dural substitute, including defect closure, stability and biocompatibility. Our results support the assumed positive influence of PHB on bone regeneration. Objectives: Although many experimental and clinical studies have been performed to identify a suitable material to repair defects of the dura mater, no ideal dural substitute is currently available. PHB is a biodegradable and biocompatible polymer that might serve as dural substitute and osteosynthesis material in cranial bone defects. Materials and methods: Different standardized PHB patches were used in six minipigs for covering defined bone defects in the anterior skull base including a dura mater lesion as well as in the frontal sinus front wall. After a defined time of implantation of 3, 6, and 9 months PHB patches were explanted and examined for clinical findings, biodegradation, presence of microorganisms, histological findings, and elec...