title: Accuracy Comparison of Implant Impression Techniques: A Systematic Review.
abstract: BACKGROUND
  Several studies link the seamless fit of implant-supported prosthesis with the accuracy of the dental impression technique obtained during acquisition. In addition, factors such as implant angulation and coping shape contribute to implant misfit.
  
  
  OBJECTIVE
  The aim of this study was to identify the most accurate impression technique and factors affecting the impression accuracy.
  
  
  METHODS
  A systematic review of peer-reviewed literature was conducted analyzing articles published between 2009 and 2013. The following search terms were used: implant impression, impression accuracy, and implant misfit. A total of 417 articles were identified; 32 were selected for review.
  
  
  RESULTS
  All 32 selected studies refer to in vitro studies. Fourteen articles compare open and closed impression technique, 8 advocate the open technique, and 6 report similar results. Other 14 articles evaluate splinted and non-splinted techniques; all advocating the splinted technique. Polyether material usage was reported in nine; six studies tested vinyl polysiloxane and one study used irreversible hydrocolloid. Eight studies evaluated different copings designs. Intraoral optical devices were compared in four studies.
  
  
  CONCLUSIONS
  The most accurate results were achieved with two configurations: (1) the optical intraoral system with powder and (2) the open technique with splinted squared transfer copings, using polyether as impression material.
authors.affiliation: ICVS/3B's - PT Government Associate Laboratory, University of Minho, Braga, Portugal.|Algoritmi Center, School of Engineering, University of Minho, Guimarães, Portugal.|DIGARC - Polytechnic Institute of Cávado and Ave, Barcelos, Portugal.
authors.forename: António H J
authors.initials: AH
authors.lastname: Moreira
authors.affiliation: ICVS/3B's - PT Government Associate Laboratory, University of Minho, Braga, Portugal.|Algoritmi Center, School of Engineering, University of Minho, Guimarães, Portugal.|DIGARC - Polytechnic Institute of Cávado and Ave, Barcelos, Portugal.
authors.forename: Nuno F
authors.initials: NF
authors.lastname: Rodrigues
authors.affiliation: Mechanical & Materials Technologies Centre, School of Engineering, University of Minho, Guimarães, Portugal.
authors.forename: António C M
authors.initials: AC
authors.lastname: Pinho
authors.affiliation: Algoritmi Center, School of Engineering, University of Minho, Guimarães, Portugal.
authors.forename: Jaime C
authors.initials: JC
authors.lastname: Fonseca
authors.affiliation: ICVS/3B's - PT Government Associate Laboratory, University of Minho, Braga, Portugal.|DIGARC - Polytechnic Institute of Cávado and Ave, Barcelos, Portugal.
authors.forename: João L
authors.initials: JL
authors.lastname: Vilaça
mesh_terms: D015921:Dental Implants / Q000592:standards; D003761:Dental Impression Technique / Q000592:standards; D017267:Dental Prosthesis Design / Q000379:methods / Q000592:standards; D006801:Humans
chemical_list: D015921:Dental Implants
keywords: dental prosthesis; implant impression; implant misfit; impression accuracy; optical scanning