title: [The impact of the margin of restorations on periodontal health--a review].
abstract: The aim of this review is to point out the pathological effects after placement of subgingival crown margins or insufficiently adapted margins of restaurations. The distance between the base of the gingival sulcus and the alveolar bone crest is relatively stable in the context of periodontal health. The term "biological width" refers to the histological dimensions of epithelial and connective tissue attachment. The "biologic width" is in average 2 mm. This distance has to be respected in the case of teeth in need for restorations. From a clinical point of view a distance of at least 3 mm between the margin of restoration and the limbus alveolaris is indispensable. Several pre-prosthetic possibilities are discussed in order to maintain periodontal health. Orthodontic or surgical procedures can be used to obtain of a sufficient distance of the margin of restoration to the alveolar bone crest.
authors.affiliation: Klinik für Parodontologie, Endodontologie und Kariologie, Universitätskliniken für Zahnmedizin der Universität Basel. Mohammad.amiri@unibas.ch
authors.forename: Mohammad
authors.initials: M
authors.lastname: Amiri-Jezeh
authors.forename: Edith
authors.initials: E
authors.lastname: Rateitschak
authors.forename: Roland
authors.initials: R
authors.lastname: Weiger
authors.forename: Clemens
authors.initials: C
authors.lastname: Walter
mesh_terms: D016556:Crown Lengthening; D003442:Crowns / Q000009:adverse effects*; D018772:Dental Marginal Adaptation; D006801:Humans; D050793:Orthodontic Extrusion; D010510:Periodontal Diseases / Q000209:etiology* / Q000517:prevention & control*; D010519:Periodontium / Q000033:anatomy & histology