ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The temperature at the surface of the bony recipient site during drilling fororthodontic micro-implant placement was monitored using infrared thermography. The primaryobjective was to identify proper drilling conditions to allow efficient drilling without raising thebone temperature above the threshold temperature of 44oC to 47oC. Bovine ribs were selected toprovide cortical bone of a similar quality to the human mandible. Four drilling conditionscombining 2 motor speeds (600 and 1200 rpm) and 2 pressure loads (500 g and 1000 g) wereestablished based on clinical practice. Much care was taken to duplicate an oral environment,although no irrigation was used to allow the infrared radiation to transmit without being hindered bycooling water. Thermal images were recorded using a Thermovision 900 system (Amega,Danderryd, Sweden). The results showed that the temperature rise relys significantly on the drillingspeed and pressure. When both the drilling speed and the pressure were low, the cortical bone couldnot be cut. However, increasing either the speed or the pressure resulted in a temperature increase.Drill speed of 600 rpm at the pressure load 1000g produced more or less the same temperature, 40-45 o C, as when the drill speed was increased to 1200 rpm while keeping the load at 500g. Yet, atemperature as high as 62.4 o C was recorded when combining the high motor speed and highpressure. Most of the temperature rise took place during the initial 5-10 seconds of drilling,indicating that intermittent irrigation at an interval of 5 seconds or less would be of particularimportance to minimize possible thermal trauma
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1044.pdf
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