António H J Moreira1,2,3, Nuno F Rodrigues1,2,3, António C M Pinho4, Jaime C Fonseca2, João L Vilaça1,3. 1. ICVS/3B's - PT Government Associate Laboratory, University of Minho, Braga, Portugal. 2. Algoritmi Center, School of Engineering, University of Minho, Guimarães, Portugal. 3. DIGARC - Polytechnic Institute of Cávado and Ave, Barcelos, Portugal. 4. Mechanical & Materials Technologies Centre, School of Engineering, University of Minho, Guimarães, Portugal.
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. PURPOSE: The aim of this study was to identify the most accurate impression technique and factors affecting the impression accuracy. MATERIAL AND 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.
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. PURPOSE: The aim of this study was to identify the most accurate impression technique and factors affecting the impression accuracy. MATERIAL AND 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.