Accession Number : ADA327525

Title :   Erosion Rate, Surface Finish and Electrode Wear in Electric Discharge Machining (EDM) of Dental Alloys.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Orraca, Guillermo E.

PDF Url : ADA327525

Report Date : 11 JUL 1997

Pagination or Media Count : 175

Abstract : A precise fit of dental restorations is critical in all aspects of prosthetic dentistry. Fabrication of a prosthesis with a high degree of accuracy is difficult due to the dimensional changes of different dental materials. EDM is an extremely accurate non-contact machining process with a precision as small as 0.002 mm. The objectives of this study were to investigate how changes in amperage and on-time of the EDM process affect the metal removal rate (MRR) and surface finish (Ra) of representative dental materials. The percentage of electrode wear (PEW) of representative electrode materials in different metal-electrode combinations was also studied. Three representative dental metals (workpieces) were used; Type III gold (Ney), Olympia ceramo-metal Alloy (Jelenko) and titanium (Ti) (Rematitan). Type III gold and ceramometal alloy were cast in bars 6mm square and 30 mm in length. Ti ingots were used as provided by manufacturer.

Descriptors :   *MACHINING, *ELECTRIC DISCHARGES, *DENTAL PROSTHESES, REMOVAL, SURFACE FINISHING, THESES, ALLOYS, EROSION, TITANIUM, GOLD.

Subject Categories : Medical Facilities, Equipment and Supplies
      Fabrication Metallurgy
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE