Histologic evaluation of root coverage obtained with GTR in humans: A casereport

The purpose of this study was to histologically evaluate four teeth with re cession defects that were treated with guided tissue regeneration (GTR). Th e amount of root coverage obtained ranged from 16.7% to 50.0%. In one of th e defects treated, new bone was formed but none of the new bone was coronal to the original gingival margin. Additionally, in this one case new cement um and connective tissue attachment was formed. However, because the new bo ne, new cementum, and new connective tissue were not coronal to the origina l gingival margin, this result could not be classified as regeneration. The vast majority of the attachment in this defect was long junctional epithel ial attachment in the portion of the recession defect covered by the root-c overage procedure. In the other three defects treated, there was a loss of bone. All of the root coverage obtained was a long junctional epithelial at tachment in three of the four defects. The results of this study do not sho w regeneration in any of the four defects treated.