title: Dimensional changes during veneering procedures on discoloured teeth.
abstract: OBJECTIVE
  The aim of the study was to determine the dimensional changes of teeth when veneering procedures are involved.
  
  
  METHODS
  Fifteen discoloured central incisors were selected from a group of 180 veneer restorations (VRs) composed of three different types of materials (direct resin composite, indirect resin composite and porcelain). Impressions and dies were made before treatment, after preparation and after placement and finishing the restoration. Contact stylus profilometry and subsequent analysis of the 3-D surface images provided quantitative data of the differences between the various treatment phases.
  
  
  RESULTS
  The preparation reduction was the most for indirect resin composite VRs and the least for direct resin composite VRs. All veneer restorations showed nearly the same thickness and dimensional change after treatment, except one, which resulted in an additional increase of volume of the tooth.
  
  
  CONCLUSIONS
  From the results of this study it is concluded that the dimensions of a discoloured tooth treated with a veneer restoration unintentionally increased, resulting in overcontour.
authors.affiliation: Department of Occlusal Reconstruction and Oral Function, University of Nijmegen, The Netherlands. secrof@dent.kun.nl
authors.forename: A C
authors.initials: AC
authors.lastname: Meijering
authors.forename: M C
authors.initials: MC
authors.lastname: Peters
authors.forename: R
authors.initials: R
authors.lastname: DeLong
authors.forename: M R
authors.initials: MR
authors.lastname: Pintado
authors.forename: N H
authors.initials: NH
authors.lastname: Creugers
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003743:Dental Enamel / Q000473:pathology; D003761:Dental Impression Technique; D003775:Dental Polishing; D003776:Dental Porcelain / Q000737:chemistry; D003801:Dental Veneers; D004955:Esthetics, Dental; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007180:Incisor / Q000473:pathology*; D003765:Models, Dental; D012390:Root Canal Therapy / Q000009:adverse effects; D013499:Surface Properties; D014075:Tooth Discoloration / Q000209:etiology / Q000473:pathology / Q000628:therapy*; D019246:Tooth Preparation; D019553:Tooth, Nonvital / Q000150:complications
chemical_list: D003188:Composite Resins; D003776:Dental Porcelain