title: Low-fusing counterdies for measuring accuracy of dies or impression materials.
abstract: Described in this pilot study is the genesis, development, and use of a system for measuring impression and die material accuracy with low-fusing bismuth alloy counterdies. The method followed the same sequence used in dental laboratory technology with the assumption that the errors associated with the wax pattern, investing, and casting had been largely eliminated. Determination of the alloy shrinkage was the first step, followed by a comparison of two impression and two die materials used in conjunction with master dies of full crown and MOD configurations. Misfit measurements revealed marginal openings of 12 to 219 microns depending on die configuration, the impression, or the die material. A 2 x 2 factorial statistical model with interaction revealed main and interactive effects. This procedure could be useful in future investigations.
authors.affiliation: Department of Prosthodontics and Biomaterials, University of Medicine and Dentistry of New Jersey, Newark.
authors.forename: J A
authors.initials: JA
authors.lastname: Stackhouse
authors.forename: W
authors.initials: W
authors.lastname: Yoon
authors.forename: S
authors.initials: S
authors.lastname: Von Hagen
mesh_terms: D000704:Analysis of Variance; D001729:Bismuth; D003442:Crowns; D003722:Dental Alloys; D003735:Dental Casting Technique / Q000592:standards*; D003760:Dental Impression Materials; D006801:Humans; D007284:Inlays; D016018:Least-Squares Analysis; D003765:Models, Dental / Q000592:standards*; D010865:Pilot Projects; D015203:Reproducibility of Results
chemical_list: D003722:Dental Alloys; D003760:Dental Impression Materials; C029301:indiloy; D001729:Bismuth