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M B Abouzgia

Publications and source records attributed to M B Abouzgia.

5 recordsLinked to original sources
PubMed1996

Effect of drill speed on bone temperature.

Measurements of bone temperature rise were recorded during drilling of bovine cortical bone specimens. A surgical drill (Stryker-100) was fitted with a custom-designed speedometer for monitoring the rotational speed during the drilling, and the drill was mounted on a specially constructed drill press. The tests were conducted in 36 specimens at variable speeds (20000-100000 rpm) and at different constant forces (1.5-9.0 N) which were applied by placing weights on the drill platform. The results revealed that the temperature rise and the duration of temperature elevation decreased with speed and force, suggesting that drilling at high speed and with large load is much more desirable than previously thought.

Animals↗
PubMed1995

Measurements of shaft speed while drilling through bone.

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.

Animals↗
PubMedDate not supplied

Temperature rise during drilling through bone.

Temperature was measured during drilling in bovine cortical bone specimens. A surgical drill fitted with a custom-designed speedometer and mounted on a drill press was used to drill holes at one speed, 49,000 rpm, and at forces in the range of 1.5 to 9.0 N. The resulting temperatures were recorded by thermocouples placed at various locations. The distribution of maximum local temperature rise (delta T) was best fitted by the function delta T = aR-b, where R is the distance from the center of the drilled hole and a and b are constants that were found by regression analysis. It was also found that the temperature increased with force, up to about 4.0 N, and then decreased at forces greater than that because of decreased drilling time. A separate series of tests revealed that temperatures were higher in the longitudinal direction than in the circumferential direction; this difference was attributed to the anisotropic thermal properties of bone.

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