The association of hydrogel and biphasic calcium phosphate in the treatment of dehiscence-type peri-implant defects: an experimental study in dogs

• DOI: 10.1007/s10856-013-5019-x
• Publication Date: 2013-08-02T06:56:26Z
• Authors: Xavier Struillou; Mia Rakic; Zahi Badran; Laure Macquigneau; Caroline Colombeix; Paul Pilet; Christian Verner; Olivier Gauthier; Pierre Weiss; Assem Soueidan
• Keywords: Calcium Phosphates; Bone Regeneration; Polymers; Biocompatible Materials; Methylcellulose; 03 medical and health sciences; Dogs; Hypromellose Derivatives; 0302 clinical medicine; Osseointegration; Animals; [SDV.MHEP.RSOA] Life Sciences [q-bio]/Human health and pathology/Rhumatology and musculoskeletal system; Wound Healing; [SDV.MHEP.GEG] Life Sciences [q-bio]/Human health and pathology/Geriatry and gerontology; [SDV.MHEP.GEG]Life Sciences [q-bio]/Human health and pathology/Geriatry and gerontology; Hydrogels; Membranes, Artificial; Prostheses and Implants; 3. Good health; Cross-Linking Reagents; [SDV.MHEP.RSOA]Life Sciences [q-bio]/Human health and pathology/Rhumatology and musculoskeletal system; Bone Substitutes; Hydroxyapatites; Stress, Mechanical

Hydrogel polymers have many applications in regenerative medicine. The aim of this study in dogs was to investigate bone regeneration in dehiscence-type peri-implant defects created surgically and treated with (i) biphasic calcium phosphate (BCP) granules alone; (ii) a composite putty hydroxypropyl methylcellulose (HPMC)/BCP (MBCP/putty); and (iii) a polymer crosslinked membrane of silanized-HPMC (Si-HPMC/BCP) compared with empty controls. At 3 months, new bone formation was significantly more important in defects filled with HPMC/BCP or Si-HPMC/BCP compared with spontaneous healing in control (P = 0.032 and P = 0.046 respectively) and more substantial compared with BCP alone. Furthermore, new bone formation in direct contact with the implant surface was observed in all three groups treated with BCP. The addition of HPMC to the BCP granules may have enhanced the initial stability of the material within the blood clot in these large and complex osseous defects. The Si-HPMC hydrogel may also act as an occlusive membrane covering the BCP, which could improve the stability of the granules in the defect area. However, the crosslinking time of the Si-HPMC is too long for easy handling and the mechanical properties remain to be improved. The composite MBCP/putty appears to be a valuable bone-graft material in complex defects in periodontology and implantology. These encouraging results should now be confirmed in clinical studies.