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Healing of implant dehiscence defects with without expanded polytetrafluoroethylene membranes: a controlled clinical and histological study and histological study
Author(s) -
Palmer R. M.,
Floyd P. D.,
Palmer P. J.,
Smith B. J.,
Johansson C. B.,
Albrektsson T.
Publication year - 1994
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1034/j.1600-0501.1994.050206.x
Subject(s) - trephine , dehiscence , medicine , soft tissue , dentistry , implant , prosthesis , surgery , mandible (arthropod mouthpart) , botany , biology , genus
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.