Therefore their classification was subdivided as follows. The proposed classification evaluated the relationship between the gingiva and the clinical crown on one hand and the relationship between the CEJ and the bone crest on the other. Some patients with this condition in case of high lip line may present a smile with clinical crowns that appear short or shorter than they should be. The concept of delayed passive eruption was first introduced by Coslet et al. Indeed, all the available literature shows that the dimensions of soft tissue attachment are highly variable and that such values could serve as a reference, but it also shows that measurements should be registered case by case given a certain range of variability. Their findings showed an average dimension of 2.05 mm for the distance between the cementum-enamel junction and the alveolar bone crest and 2.0 mm for the biologic width. In 2004 Alpiste-Illueca introduced a new method for measurement by using a reproducible radiographic technique. Their results showed a mean dimension of 1.14 mm for the epithelial attachment and 0.77 mm for the connective tissue attachment. The same findings were shown in a study by Reinken and Van Oost in 1992 investigating cadaver jaws describing that the connective tissue attachment is less variable than the epithelial attachment. On the other hand the epithelial attachment was variable and the average dimension was 0.97 mm. Their findings showed that the distance between the base of the epithelial attachment and the bone crest was constant and in all stages of eruption the average dimension was 1.07 mm. They divided the dentogingival junction into the connective tissue attachment and the epithelial attachment. In 1996 Garber and Salama published a paper that studied the biologic width on human cadaver teeth. The concept of "biologic width" is very important in all branches of dentistry, since a healthy interface between the teeth and the hard and soft tissues is the keystone in all successful restorative, periodontal, prosthetic, and orthodontic cases. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Received 4 February 2014 Revised Accepted Roberto Rossi 1 and Giorgio Brunelli 2 and Vincenzo Piras 2 and Andrea Pilloni 1ġ, Department of Periodontology, University of Rome "Sapienza", ItalyĢ, School of Dental Medicine, University of Cagliari, Italy
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