title: A comparison of ePTFE membranes alone or in combination with platelet-derived growth factors and insulin-like growth factor-I or demineralized freeze-dried bone in promoting bone formation around immediate extraction socket implants.
abstract: The purpose of this study was to compare bone promotion around implants which were augmented with ePTFE membranes alone or in combination with cortical demineralized freeze-dried bone (DFDB) or the combination of platelet derived growth factor-BB (PDGF) and insulin like growth factor I (PDGF/IGF-I). Membranes were placed over titanium implants which had been inserted into fresh extraction sockets with large buccal dehiscences. Twenty-four implants were placed in 4 dogs. At 18 weeks clinical bone height measurements were taken, the animals were sacrificed, and all specimens retrieved for histologic evaluation. Clinically, a significant gain in bone levels was present in both the ePTFE membrane alone group (P < 0.005) and PTFE plus PDGF/IGF-I group (P < 0.01), but not in the PTFE plus DFDB group. Results from histometric measurements revealed an approximately 2-fold increase in the percentage of implant surface in contact with bone, area of bone adjacent to the implant surface, and in the total length of the implant surface in contact with bone in the dehiscence defects treated with ePTFE plus PDGF/IGF-I compared to the defects receiving ePTFE membranes alone (each P < 0.05). The response to the DFDB was highly variable and it did not significantly improve the efficacy of the PTFE membranes for any parameter measured. The distance from the outer surface of the new bone to the implant surface was statistically significant for ePTFE membranes alone and membranes plus PDGF/IGF-I. The results demonstrated that clinically, ePTFE membranes alone or ePTFE membranes with PDGF/IGF-I were equally effective in promoting bone growth around the implants. Histologic measurements demonstrated that sites treated with ePTFE membranes plus PDGF/IGF-I had the highest bone density compared with sites which received ePTFE membranes alone or with ePTFE membranes and DFDB. The results of this study question the use of DFDB and support the use of ePTFE membranes alone or with PDG-F-BB/IGF-I as potential methods of promoting bone formation around dental implants.
authors.affiliation: Department of Periodontics, University of Texas, Houston.
authors.forename: W
authors.initials: W
authors.lastname: Becker
authors.forename: S E
authors.initials: SE
authors.lastname: Lynch
authors.forename: U
authors.initials: U
authors.lastname: Lekholm
authors.forename: B E
authors.initials: BE
authors.lastname: Becker
authors.forename: R
authors.initials: R
authors.lastname: Caffesse
authors.forename: K
authors.initials: K
authors.lastname: Donath
authors.forename: R
authors.initials: R
authors.lastname: Sanchez
mesh_terms: D016301:Alveolar Bone Loss / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D000539:Alveolar Process / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology*; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000818:Animals; D001861:Bone Regeneration / Q000187:drug effects / Q000502:physiology; D016025:Bone Transplantation / Q000379:methods*; D003238:Connective Tissue / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D003648:Decalcification Technique; D015921:Dental Implants; D004285:Dogs; D005612:Freeze Drying; D005881:Gingiva / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D007334:Insulin-Like Growth Factor I / Q000627:therapeutic use*; D008567:Membranes, Artificial; D010006:Osteoblasts / Q000187:drug effects / Q000473:pathology / Q000502:physiology; D010982:Platelet-Derived Growth Factor / Q000627:therapeutic use*; D011138:Polytetrafluoroethylene; D014021:Tissue Preservation; D014081:Tooth Extraction
chemical_list: D015921:Dental Implants; D008567:Membranes, Artificial; D010982:Platelet-Derived Growth Factor; D007334:Insulin-Like Growth Factor I; D011138:Polytetrafluoroethylene