title: Dimensional accuracy of improved dental stone and epoxy resin die materials. Part II: Complete arch form.
abstract: BACKGROUND
  Little information has been reported with regard to the dimensional accuracy of improved dental stone materials for reproduction of an entire arch form.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the ability of an epoxy resin die material and a type IV dental stone to dimensionally reproduce an entire arch form.
  
  
  METHODS
  Models were fabricated and measurements were made of reference marks to calculate dimensions from first molar to the midline bilaterally and between first molars. Each measurement was repeated three times and the mean measurement and percent relative change was calculated for each dimension.
  
  
  RESULTS
  The results revealed that the difference in the relative change in two dimensions was statistically significant for the epoxy resin group (p < 0.05).
  
  
  CONCLUSIONS
  The materials provided a similar degree of dimensional accuracy in reproducing a complete arch when used with addition silicone impression material.
authors.affiliation: University of Nebraska Medical Center College of Dentistry, Lincoln, USA.
authors.forename: N R
authors.initials: NR
authors.lastname: Chaffee
authors.forename: J H
authors.initials: JH
authors.lastname: Bailey
authors.forename: D J
authors.initials: DJ
authors.lastname: Sherrard
mesh_terms: D000704:Analysis of Variance; D002133:Calcium Sulfate; D004853:Epoxy Resins; D005069:Evaluation Studies as Topic; D006801:Humans; D008422:Materials Testing; D003765:Models, Dental / Q000592:standards*; D015203:Reproducibility of Results
chemical_list: D004853:Epoxy Resins; D002133:Calcium Sulfate