Temperature changes during cortical bone drilling with a newly designed step drill and an internally cooled drill

Augustin, Goran and Davila, Slavko and Udiljak, Toma and Staroveški, Tomislav and Brezak, Danko and Babić, Slaven (2012) Temperature changes during cortical bone drilling with a newly designed step drill and an internally cooled drill. = Temperature changes during cortical bone drilling with a newly designed step drill and an internally cooled drill. International Orthopaedics, 36 (7). pp. 1449-1456. ISSN 0341-2695. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2012). .

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Official URL: https://doi.org/10.1007/s00264-012-1491-z


Purpose: Bone drilling causes an increase in bone temperature, and a temperature above 47°C is critical because it causes thermal bone necrosis. Thermal osteonecrosis is common with the drill diameter of ≥4.5 mm without cooling. The aim of this study was to determine the increase of bone temperature during drilling using newly contructed two-step and internally cooled drills. Methods: An experiment was set up according to a central composite design. An internally cooled drill (3.4 mm and 4.5 mm) and a two-step drill (2.5/3.4 and 3.4/4.5 mm) were used in combination with feed rates of (0.02, 0.04, 0.10, 0.16 and 0.18 mm/rev) and cutting speeds (1.18, 10.68, 33.61, 56.55 and 66.05 m/min) with and without cooling with water of 24°C. Bone temperatures were measured with thermocouples. Drilling was performed on pig diaphyses with a three-axis mini milling machine. Results: Bone temperatures in all combinations of parameters with internal cooling were below the critical 47°C (p00.05). The highest temperatures were detected using a 4.5-mm drill (40.5°C). A statistically significant effect other than cooling was found with the drill diameter and feed. A drill diameter of 3.4 mm with internal cooling developed a maximum temperature of 38.5°C and without cooling 46.3°C. For the same conditions a drill with diameter of 4.5 mm reached temperatures of 40.5°C and 55.7°C, respectively. The effect of feed rate is inversely proportional to the increase in bone temperature. With the feed rate 0.16 mm/rev, temperature was below critical even using the 4.5-mm drill (46.4°C, p00.05). Using the 3.4-mm drill all temperatures were below critical (46.2°C, p00.05). The two-step drill compared to a standard drill with the same diameter did not show statistical differences in maximum bone temperatures for all combinations of parameters (p00.05). Conclusions: A two-step drill does not have any advantages over a standard twist drill of the same diameter. An internally cooled drill causes a significantly smaller increase of bone temperature during drilling with water of 24°C. An internally cooled drill is currently the 'ideal' drill for traumatology/orthopaedics because it produces the smallest increase in bone drilling temperature. If internal cooling is used the regulation of other drilling parameters is of no importance.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): animal tissue; article; biomedical technology assessment; bone drilling; bone temperature; cooling; cortical bone; drill; equipment design; intermethod comparison; male; nonhuman; orthopedic equipment; orthopedic surgery; priority journal; swine; temperature; temperature dependence, animals; body temperature; burns; equipment design; femur; hot temperature; male; mandrillus; orthopedic procedures; osteonecrosis; swine
Divisions: 1200 Department of Technology > 1230 Chair of Machine Tools
900 Department of Robotics and Production System Automation > 910 Chair of Engineering Automation
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2012)
Date Deposited: 28 Apr 2015 12:33
Last Modified: 15 Nov 2018 13:23
URI: http://repozitorij.fsb.hr/id/eprint/3941

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