title: Hardness, strength, and ductility of prefabricated titanium rods used in the manufacture of spark erosion crowns.
abstract: Depending on the size of the prepared tooth spark eroded and milled, Procera crowns (Nobelpharma AB, Göteborg, Sweden) are manufactured from one of five diameters of pure titanium rods. In this study microindentation hardness tests were performed on the outer 400 microns and center of 10 samples for each type of rod. Five tensile samples were also machined for each of the diameters and tested in tension in a universal testing machine. Cast titanium samples were similarly prepared and tested. Some significant differences in hardness and considerable differences in strength and ductility were identified between the prefabricated rods. In comparison, cast titanium was significantly harder and stronger but less ductile.
authors.affiliation: Department of Prosthodontics, School of Dentistry, University of Bergen, Norway.
authors.forename: E
authors.initials: E
authors.lastname: Berg
authors.forename: G
authors.initials: G
authors.lastname: Davik
authors.forename: T
authors.initials: T
authors.lastname: Hegdahl
authors.forename: N R
authors.initials: NR
authors.lastname: Gjerdet
mesh_terms: D000704:Analysis of Variance; D003442:Crowns; D003735:Dental Casting Technique; D003775:Dental Polishing / Q000379:methods*; D003776:Dental Porcelain; D017267:Dental Prosthesis Design / Q000379:methods*; D004548:Elasticity; D006244:Hardness; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D014025:Titanium
chemical_list: D016876:Metal Ceramic Alloys; C077451:Procera; D003776:Dental Porcelain; D014025:Titanium