title: Performance of dental impression materials: Benchmarking of materials and techniques by three-dimensional analysis.
abstract: Among other factors, the precision of dental impressions is an important and determining factor for the fit of dental restorations. The aim of this study was to examine the three-dimensional (3D) precision of gypsum dies made using a range of impression techniques and materials. Ten impressions of a steel canine were fabricated for each of the 24 material-method-combinations and poured with type 4 die stone. The dies were optically digitized, aligned to the CAD model of the steel canine, and 3D differences were calculated. The results were statistically analyzed using one-way analysis of variance. Depending on material and impression technique, the mean values had a range between +10.9/-10.0 µm (SD 2.8/2.3) and +16.5/-23.5 µm (SD 11.8/18.8). Qualitative analysis using colorcoded graphs showed a characteristic location of deviations for different impression techniques. Three-dimensional analysis provided a comprehensive picture of the achievable precision. Processing aspects and impression technique were of significant influence.
authors.affiliation: Department of Prosthetic Dentistry, Center of Dentistry, Ulm University.
authors.forename: Heike
authors.initials: H
authors.lastname: Rudolph
authors.forename: Michael R S
authors.initials: MR
authors.lastname: Graf
authors.forename: Katharina
authors.initials: K
authors.lastname: Kuhn
authors.forename: Stephanie
authors.initials: S
authors.lastname: Rupf-Köhler
authors.forename: Alfred
authors.initials: A
authors.lastname: Eirich
authors.forename: Cornelia
authors.initials: C
authors.lastname: Edelmann
authors.forename: Sebastian
authors.initials: S
authors.lastname: Quaas
authors.forename: Ralph G
authors.initials: RG
authors.lastname: Luthardt
mesh_terms: D003102:Colloids / Q000737:chemistry; D003760:Dental Impression Materials / Q000737:chemistry* / Q000145:classification*; D004987:Ethers / Q000737:chemistry; D021621:Imaging, Three-Dimensional; D012828:Silicones / Q000737:chemistry
chemical_list: D003102:Colloids; D003760:Dental Impression Materials; D004987:Ethers; D012828:Silicones