title: Effect of three variables on the accuracy and variability of electroplated copper dies.
abstract: This investigation compared the accuracy of electroplated copper and stone dies. Sixty copper die replicas of a stainless steel master die were fabricated using different current settings, plating times, and backing materials. Die accuracy was assessed by measuring the misfit of a stainless steel ring machined to fit the master die. All the copper dies were more accurate than the 10 stone dies. The variability of the copper/stone dies was less than that of the stone dies (P = .011) and copper-resin dies (P < .001). There was no significant difference between the variability of the 40-mA, 48-hour copper-resin dies and the stone dies. The variability of the copper-resin dies was related to the thickness of the electrodeposit, which was a function of plating time, current, and plated surface area.
authors.affiliation: Department of Clinical Dentistry, Westmead Hospital Dental Clinical School, Australia.
authors.forename: E M
authors.initials: EM
authors.lastname: Cassimaty
authors.forename: T R
authors.initials: TR
authors.lastname: Walton
mesh_terms: D000704:Analysis of Variance; D002133:Calcium Sulfate; D003300:Copper; D004595:Electroplating; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D008768:Methylmethacrylates; D003765:Models, Dental / Q000592:standards; D015203:Reproducibility of Results
chemical_list: D008768:Methylmethacrylates; C034578:Duralay; D003300:Copper; D002133:Calcium Sulfate