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Drilling of bone: Effect of drill bit geometries on thermal osteonecrosis risk regions

Mohd Faizal, Ali Akhbar and A. R., Yusoff (2019) Drilling of bone: Effect of drill bit geometries on thermal osteonecrosis risk regions. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 233 (2). pp. 207-218. ISSN 0954-4119

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Bone-drilling operation necessitates an accurate and efficient surgical drill bit to minimize thermal damage to the bone. This article provides a methodology for predicting the bone temperature elevation during surgical bone drilling and to gain a better understanding on the influences of the point angle, helix angle and web thickness of the drill bit. The pro- posed approach utilized the normalized Cockroft–Latham damage criterion to predict material cracking in the drilling process. Drilling simulation software DEFORM-3D is used to approximate the bone temperature elevation correspond- ing to different drill bit geometries. To validate the simulation results, bone temperature elevations were evaluated by comparison with ex vivo bone-drilling process using bovine femurs. The computational results fit well with the ex vivo experiments with respect to different drill geometries. All the investigated drill bit geometries significantly affect bone temperature rise. It is discovered that the thermal osteonecrosis risk regions could be reduced with a point angle of 110 to 140, a helix angle of 5 to 30 and a web thickness of 5% to 40%. The drilling simulation could accurately estimate the maximum bone temperature elevation for various surgical drill bit point angles, web thickness and helix angles. Looking into the future, this work will lead to the research and redesign of the optimum surgical drill bit to minimize thermal insult during bone-drilling surgeries.

Item Type: Article
Uncontrolled Keywords: Bone drilling, temperature, elevation, FEA, osteonecrosis, drill bit
Subjects: R Medicine > RD Surgery
T Technology > TJ Mechanical engineering and machinery
T Technology > TS Manufactures
Faculty/Division: Faculty of Engineering Technology
Depositing User: Mr. Mohd Faizal Ali Akhbar
Date Deposited: 25 Feb 2019 04:12
Last Modified: 25 Feb 2019 04:12
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