Healing of implant dehiscence defects with without expanded polytetrafluoroethylene membranes: a controlled clinical and histological study and histological study |
| |
Authors: | R. M. Palmer P. D. Floyd P. J. Palmer B. J. Smith C. B. Johansson T. Albrektsson |
| |
Affiliation: | Department of Periodontology and Unit of Restorative Dentistry, United Medical and Dental Schools of Guy's and St Thomas's Hospitals, London, United Kingdom;;Department of Handicap Research, University of Göteborg, Sweden |
| |
Abstract: | Bone augmentation around implant fixtures using the technique of guided tissue regeneration has been described in a number of reports. The aim of this study was to evaluate bone fill around dehiscence defects at matched defects randomly allocated to test (expanded polytetrafluoroethylene; Gore‐Tex) or control treatments within the same patient. Six edentulous subjects were treated with overdentures supported by 2 fixtures ad modum Brinemark. In addition, 2 experimental 7 mm fixtures with nearly identical dehiscence defects on the labial aspect were placed in the anterior part of the mandible. Baseline defect heights ranged from 2.5 to 4.0 mm with 2 to 4 threads exposed. The test fixture dehiscence was covered with a Gore‐Tex membrane secured with a cover screw. The experimental fixtures were exposed after 5 months at stage 2 surgery and measurements and photographs repeated. The fixtures were then removed with a trephine and processed for histological evaluation. Regeneration of a hard tissue resembling bone was observed in 4 of 6 cases treated with Gore‐Tex, amounting to between 95 and 100% elimination of the dehiscence and total coverage of the threads. However, in one of these cases, histological evaluation showed that it was soft tissue and not bone, and in a further case soft tissue regeneration was apparent both clinically and histologically. In another case there was no significant regeneration at either test or control defects. Although there was a trend for the Gore‐Tex treated dehiscences to respond more favourably, the differences in clinical and histological measurements between test and control failed to reach statistical significance. |
| |
Keywords: | implant expanded polytetrafluoroethylene dehiscence defect |
|
|