title: [The influences of metal-ceramic restoration margins on gingival health].
abstract: OBJECTIVE
  Today metal-ceramic restorations are widely accepted in dental practice because of their good aesthetic and biocompatible properties, but there are still several problems to be resolved, among which the influences of their margins on gingival health is noticeable. The purpose of this study was to investigate the influences of metal-ceramic restoration margin on gingival health.
  
  
  METHODS
  129 abutments of metal-ceramic restorations, including their margins' fitness, location and smoothness were examined and their influences on gingival health were analyzed.
  
  
  RESULTS
  There was a close relation between the metal-ceramic restorations' margins and the gingival health.
  
  
  CONCLUSIONS
  In order to maintain the gingival health, the margins should be smooth, closely fitted, no overhanging and in a moderate location (i.e. not below the gingival more than 1 mm).
authors.affiliation: Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Zhu
authors.forename: Ningyi
authors.initials: N
authors.lastname: Tan
authors.forename: Juan
authors.initials: J
authors.lastname: Zhao
mesh_terms: D005260:Female; D005882:Gingival Diseases / Q000209:etiology*; D005891:Gingivitis / Q000209:etiology*; D006470:Hemorrhage / Q000209:etiology*; D006801:Humans; D008297:Male; D016876:Metal Ceramic Alloys / Q000009:adverse effects*
chemical_list: D016876:Metal Ceramic Alloys