title: A Comparative Study of the Accuracy of Dies Made from Digital Intraoral Scanning vs. Elastic Impressions: An In Vitro Study.
abstract: OBJECTIVE
  To compare the dimensional accuracy of dies generated from digital intraoral scans with dies generated from conventional polyvinyl siloxane (PVS) impression material.
  
  
  METHODS
  A machined metal die was impressed 10 times using PVS, and scanned 10 times using the iTero Cadent system and 10 times using the LAVA C.O.S. system. Dies generated from each system were imaged in a standardized holder using a microscope and measured with analytical software at three sites and compared with the dimensions of the master die.
  
  
  RESULTS
  The dimensional differences between the master die and both the PVS and iTero groups were approximately 60 μm in all three dimensions but the Lava C.O.S. die dimensions measured close to 100 μm at two of the three sites.
  
  
  CONCLUSIONS
  PVS/Die and iTero groups offered superior reproduction of the master die in terms of dimensional accuracy, but these differences are likely of little clinical significance.
authors.affiliation: Division of Prosthodontics, Department of General Dentistry, School of Dental Medicine, East Carolina University, Greenville, NC.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Serag
authors.affiliation: Department of Prosthetic Dental Science, King Saud University College of Dentistry, Riyadh, Saudi Arabia.
authors.forename: Talal Al
authors.initials: TA
authors.lastname: Nassar
authors.affiliation: Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, NJ.
authors.forename: Dane
authors.initials: D
authors.lastname: Avondoglio
authors.affiliation: Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, NJ.
authors.forename: Saul
authors.initials: S
authors.lastname: Weiner
mesh_terms: D003760:Dental Impression Materials; D003761:Dental Impression Technique; D006801:Humans; D007091:Image Processing, Computer-Assisted; D066298:In Vitro Techniques; D003765:Models, Dental; D011145:Polyvinyls; D012833:Siloxanes
chemical_list: D003760:Dental Impression Materials; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane
keywords: Digital impressions; dies; dimensional accuracy; fixed prosthodontics