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

Znanstveni rad - Izvorni znanstveni rad

• Autor: Goran Augustin
• Autor: Slavko Davila
• Autor: Toma Udiljak
• Autor: Tomislav Staroveški
• Autor: Danko Brezak
• Autor: Slaven Babić
• Autorova ustanova: Sveučilište u Zagrebu; Medicinski fakultet
• Znanstveno / umjetničko područje, polje i grana: BIOMEDICINA I ZDRAVSTVO; Kliničke medicinske znanosti

Sažetak (engleski)

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 (p=0.05). 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, p=0.05). Using the 3.4-mm drill all temperatures were below critical (46.2°C, p=0.05). 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 (p=0.05). ----- 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.

• Ključne riječi (engleski): Animals; Body Temperature; Burns/etiology; Equipment Design; Femur/injuries; Femur/surgery; Hot Temperature/adverse effects; Male; Mandrillus; Orthopedic Procedures/adverse effects; Orthopedic Procedures/instrumentation; Osteonecrosis/etiology; Osteonecrosis/prevention & control; Swine
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran
• Verzija publikacije: Završna verzija rukopisa prihvaćena za objavljivanje (postprint)
• Naslov časopisa: International Orthopaedics
• Brojčani podaci: vol. 36, br. 7, str. 1449-1456
• p-ISSN: 0341-2695
• DOI: https://doi.org/10.1007/s00264-012-1491-z
• URN:NBN: urn:nbn:hr:105:444571
• Datum objave publikacije: 2012-07
• URL dokumenta: https://doi.org/10.1007/s00264-012-1491-z
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Datum i vrijeme pohrane: 2024-03-27 19:33:31