Biomechanical Evaluation of Temperature Rising and Applied Force in Controlled Cortical Bone Drilling: an Animal in Vitro Study

Document Type : RESEARCH PAPER

Authors

1 Department of Orthopedic Surgery, School of Medicine, AJA University of Medical Science, Tehran, Iran

2 School of Dentistry, Tehran University of Medical Science, Tehran, Iran

Abstract

Background: The present study was conducted to quantify the relationships between bone drilling process parameters
(i.e., feed rate, resting time, exit rate, and drill bit diameter) and drilling outcome parameters (i.e., thrust force and
maximum temperature).
Methods: This study utilized 10-cm cortical bovine samples to evaluate the effects of four independent parameters,
including drill bit diameters, six different feed rates, three various resting times, and three different exit rates on thrust
force and maximum temperature (MT). A total of 28 stainless steel orthopedic drill bits with a diameter of 2.5 and 3.2
mm, as well as an orthopedic handpiece were attached to the 500N load cell and an accurate linear variable differential
transformer to obtain forces. Moreover, two k-type thermocouples were utilized to record the temperature-time curve
near the drilling site. The data were analyzed using the two-way analysis of variance and post hoc Tukey-Kramer
Honest test.
Results: Maximum thrust force (MTF) decreased by almost 230% as the drill bit diameter increased from 2.5 to 3.2
mm in the lowest feed rate. The MTF showed a 335% increase, whereas a decrease of 69% was observed as the feed
rates rose from 0.5 to 3 mm/sec. Moreover, the MT decreased to 67% with an increasing exit rate from 1 to 3 mm/sec.
Furthermore, a slight increase was observed in MT when the resting time increased from 0 to 2 seconds (P>0.05).
Conclusion: The desired drilling is drilling with lower thrust force and lower final temperature of bone. Increasing feed
rate can cause an increase and decline in thrust force and final temperature, respectively. The highest rates of MT were
0.5 and 1 mm/min, and the optimum feed rate would be 1.5 mm/min due to the averaged thrust force. Moreover, the
resting time had no significant effects on the final temperature. Attentions to resting time would be useful to provide a
more accurate, efficient, and uniform drill hole.
Level of evidence: V

Keywords

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The Archives of Bone and Joint Surgery
Volume 8, Issue 5
September 2020
Pages 605-612

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History

  • Receive Date: 19 December 2019
  • Revise Date: 17 February 2020
  • Accept Date: 01 March 2020

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