Modelling the effects of drill bit point angle on the temperature and stress distribution on the mandible
H. Nemati, M. Eftekhari Yazdi
, K. Hassani
Abstract: Objective: The problem of heat increase in a drilled hole of the mandible has been investigated recently using experimental and numerical methods. The diameter of the drilling bit, the depth of the hole, and the angle of the bit are the main affecting factors on the induced heat in the mandible.
Materials and methods: In this study, we have designed three drill bit heads with 70,90, and 118-degree angles and made mandible geometry based on patient-specific data. The whole models were considered for actual boundary conditions and exerted forces. Thereafter, the models were analyzed using a finite element method by Abacus software.
Results: The numerical results showed that the drill bit head of 70 degrees induced less heat to the mandible compared to others and induced less stress. The drill bit with a more acute angle is suggested for drilling the bone. Furthermore, the maximum temperature decreased with decreasing drill speed and the depth of the drilled hole.
Discussion: The stress and the temperature in the bone increase with the tip angle of the bit. Another point is that the stress concentration is mainly around the area of the cutting
Conclusion: The model is useful to determine the optimum drilling head angle for drill-bit geometries.
Series on Biomechanics, Vol.39, No. 4 (2025), 58-65
DOI: 10.7546/SB.07.04.2025
Keywords: drill; finite element method; Mandible; stress; temperature
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| Date published: 2025-12-12
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