Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/46920
Title: Mechanical properties of metal-ceramic alloys at high temperature
Authors: Chew, C.L. 
Norman, R.D.
Stewart, G.P.
Issue Date: 1990
Source: Chew, C.L.,Norman, R.D.,Stewart, G.P. (1990). Mechanical properties of metal-ceramic alloys at high temperature. Dental Materials 6 (4) : 223-227. ScholarBank@NUS Repository.
Abstract: Four alloys used for the construction of porcelain-fused-to-metal restorations were tested at high temperatures (1000°C) so that loss of properties could be ascertained. In addition, thin flat plates of metal (30 × 11 × 1 mm) with a 9-mm recess and a metal thickness of 0.35 mm were processed for porcelain application and distortion measured at 15 points along the surface prior to and following each firing cycle. Yield and ultimate tensile strengths and elongation were determined on specimens at room temperature and at 1000°C. None of the alloys tested showed a great amount of distortion during the various firing cycles, yet they showed increased change with each successive heating. The greatest distortion occurred with Jelenko "O" alloy. When the mechanical properties were compared, there was a marked loss of both yield and ultimate strength values for each alloy (Jelenko "O"-Y.S., 95.64%, U.T.S., 96.22%; Olympia-Y.S., 95.08%, U.T.S., 96.76%; Tempo-Y.S., 91.23%, U.T.S., 93.46%; Biobond II-Y.S., 82.72%, U.T.S., 86.21%). Percent elongation increased by 272% with Biobond II and 370% with Jelenko "O", whereas Tempo and Olympia increased by 120 and 155%. It is apparent that the palladium-based alloy and the nickel-chromium-based alloy have higher mechanical properties at the temperature where porcelain will be applied. © 1990.
Source Title: Dental Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/46920
ISSN: 01095641
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

58
checked on Jan 12, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.