M B Abouzgia1, D F James. 1. Department of Oral and Maxillofacial Surgery, Toronto Hospital, Canada.
Abstract
PURPOSE: This study investigated the effect of force on drill speed and measured the energy consumed during the drilling process. MATERIAL AND METHODS: Applied force, drill speed, and energy consumed were measured during drilling in bovine cortical bone specimens. A commercial surgical drill was fitted with a custom-designed speedometer for measuring the rotational speed. The handpiece was attached to a laboratory drill press and positioned above a bone specimen mounted on a load cell. To apply steady loads, weights were placed on the drill platform, and tests were conducted for forces between 1.5 and 9.0 N and for free-running speeds from 20,000 to 100,000 rpm. RESULTS: The simultaneous measurements of speed and load for the electrically powered instrument showed that the average operating speed changed with the force applied: at low starting speeds, the speed increased slightly with force; at high starting speeds, the speed decreased with force by as much as 50%. The measurements of electric power showed that the total energy consumed generally decreased with speed and force, primarily because of decreased drilling time. CONCLUSION: The decrease in energy suggests that drilling at high speed and with a large force may be desirable because bone temperature is reduced.
PURPOSE: This study investigated the effect of force on drill speed and measured the energy consumed during the drilling process. MATERIAL AND METHODS: Applied force, drill speed, and energy consumed were measured during drilling in bovine cortical bone specimens. A commercial surgical drill was fitted with a custom-designed speedometer for measuring the rotational speed. The handpiece was attached to a laboratory drill press and positioned above a bone specimen mounted on a load cell. To apply steady loads, weights were placed on the drill platform, and tests were conducted for forces between 1.5 and 9.0 N and for free-running speeds from 20,000 to 100,000 rpm. RESULTS: The simultaneous measurements of speed and load for the electrically powered instrument showed that the average operating speed changed with the force applied: at low starting speeds, the speed increased slightly with force; at high starting speeds, the speed decreased with force by as much as 50%. The measurements of electric power showed that the total energy consumed generally decreased with speed and force, primarily because of decreased drilling time. CONCLUSION: The decrease in energy suggests that drilling at high speed and with a large force may be desirable because bone temperature is reduced.
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Authors: Stephan Brand; Johannes Klotz; Thomas Hassel; Maximilian Petri; Max Ettinger; Christian Krettek; Thomas Goesling; Friedrich-Wilhelm Bach Journal: Int Orthop Date: 2013-06-18 Impact factor: 3.075
Authors: Chih-Hao Chen; Benjamin R Coyac; Masaki Arioka; Brian Leahy; U Serdar Tulu; Maziar Aghvami; Stefan Holst; Waldemar Hoffmann; Antony Quarry; Oded Bahat; Benjamin Salmon; John B Brunski; Jill A Helms Journal: J Clin Med Date: 2019-02-01 Impact factor: 4.241