title: [The influences of shoulder porcelain length on the stress distribution of metal-ceramic crowns].
abstract: OBJECTIVE
  To analyze the stress distribution induced by simulated intra-oral loads on ceramometal crowns with different length of shoulder porcelain in labial margins.
  
  
  METHODS
  Eighteen two-dimensional finite element models of the maxillary central incisor restored with ceramometal crowns were constructed which were designed with different labial terminal locations of metal coping. Different coping alloys and marginal designs were employed in the crown models. The stresses of porcelain veneers and adhesive layers in all models were estimated with different loading locations and angles.
  
  
  RESULTS
  Although coping alloys and marginal designs were different, the labial terminal locations of metal coping had no influence on the stress distribution of porcelain veneers and adhesive layers.
  
  
  CONCLUSIONS
  The coping design of short labial margin to add the length of shoulder porcelain of ceramometal restorations can be used clinically.
authors.affiliation: General Dental Department, School of Stomatology, Beijing University, Beijing 100081, China.
authors.forename: Yi-hong
authors.initials: YH
authors.lastname: Liu
authors.forename: Ke
authors.initials: K
authors.lastname: Han
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Cheng-dong
authors.initials: CD
authors.lastname: Xu
mesh_terms: D003442:Crowns; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D016876:Metal Ceramic Alloys; D013314:Stress, Mechanical
chemical_list: D016876:Metal Ceramic Alloys