Ehsan Shakouri, PhD; Fatemeh Zareh, MSc; Ahmad Majd, PhD; Hossein Haghigh Hassanali Deh, MSc
Abstract
Background: Drilling of bone is used to fix the fractures with screws, wires or plates. The interaction between hole surface surface and fracture stabilization components is effective in the bonding strength of the stabilization process. During bone drilling, the temperature could increase above 47 °C ...
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Background: Drilling of bone is used to fix the fractures with screws, wires or plates. The interaction between hole surface surface and fracture stabilization components is effective in the bonding strength of the stabilization process. During bone drilling, the temperature could increase above 47 °C and cause irreversible thermal necrosis. The surface roughness can be considered as a sign of damage of the bone cells.
Methods: This study looks at the effect of rotational speed of drilling of bone on production of surface defects to determine the best processing condition for minimizing the osteonecrosis and surface defects. Seven different rotational speeds in drilling beef femur were used-in non-cooling and liquid cooling phases. In all tests the temperature was measured. After cutting samples, using hematoxylin-eosin staining were stained for detection of surface defects.
Results: The lowest heat prodution was with use of liquid cooling. The drill speed of 1500 rpm with liquid cooling showed the maximum temperature of 48.5°C without production of surface debris and defects as witnessed in stained bone segment.
Conclusions: Cooling application in bone drilling process avoids over and thus less thermal necrosis, which gives the lowest number of surface defects and highest quality wall surface hole.
Ehsan Shakouri, MSc; Mohammad Hosseyn Sadeghi, PhD; Mohammadreza Karafi, PhD; Mahmood Farzin, PhD
Abstract
Background: Internal immobilization of bone fracture often requires drilling and screw fixation of implanted bone. During bone drilling, the temperature could increase above 47°C causing irreversible thermal necrosis. This study is an experimental bone drilling with ultrasonic-assist in evaluating the ...
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Background: Internal immobilization of bone fracture often requires drilling and screw fixation of implanted bone. During bone drilling, the temperature could increase above 47°C causing irreversible thermal necrosis. This study is an experimental bone drilling with ultrasonic-assist in evaluating the temperature increase in comparison with conventional drilling.Methods: An experimental study on a bovine femur specimen was performed by drilling holes with ultrasonic assisted drill. The generated temperature in different speeds was documented at the drilling site, and was compared with the conventional drilling technique.Results: Ultrasonic-assisted drilling at 1000 rpm produced less temperature elevation compared with conventional drilling. Furthermore, at rotational speed of 2000 rpm, the temperature raise was independent of “feed rate” of the drilling.Conclusions: Using ultrasonic vibration in drilling of bovine femur produces less temperature raise in drill site, and works independent “feed rate” when compared with conventional drilling.
