The Effect of High Temperature Heating on Indentation Resistance of Cobalt Chromium Alloy Plates as Denture Labeling for Forensic Identification ( Research Report )

Abstract

The labeled denture is important to identify people who have memory loss or identify of bodies in mass disasters, mainly due to the fires. Denture labeling made of tinfoil or paper laminated, but this form can easily be damaged if exposed to high temperatures. Cobalt Chromium (CoCr) Alloy metal is resistant to high temperatures which has melting point 1150º-1500ºC, so that possibility can be used as a tool in identification. Purpose: To determine indentation resistance of CoCr alloy plates on heating with high temperatures and be expected the use of its can be alternatives as denture labeling for forensic identification. Methods: Experimental Laboratory with sample form of plates made of CoCr metal cast and measuring 30X10X2 mm, with depth of indentation is 1.5 mm. The plates were heated with temperatures 400º, 800º,1050ºC and duration 5 and 15 minutes in the preheating furnace machine. 42 samples were divided into 3 groups (temperature of heating) and each group was divided into 2 groups again (duration of heating). Results: The size of depth and width of indentation (mm) of plate for all groups, there was no significant difference between before and after heating, except in groups heating to a temperature of 1050°C for 15 minutes (P<0.05). Conclusions: Heating with high temperature is not enough to make the plate damaged and deformed, so labeling indentation can still be read clearly. The use of CoCr plate can be alternatives as denture labeling.