Analytical investigation of influence of rotational speed and feed rate on temperature elevation in jaw bone drilling

During the drilling of the jawbone, the temperature could increase and cause thermal injury in the bone. So, it appears necessary to investigate the temperature rise during bone drilling. Due to the difficulty of experimental study of temperature increase during the jawbone drilling, predicting the heat transferred to the bone during surgery, leads to the correct selection of factors affecting the temperature. Therefore, in this paper, for the first time, using the finite difference method and Wiener coefficients, the temperature of the jawbone during drilling was predicted and the influence of different drilling parameters on the temperature rise was evaluated. Spindle speed were 200, 400, 800, 1200 and 2500 rpm, feed rate 50, 60, 90 and 120 mm/min and drill point angle 70, 90 and 118 degrees. Results showed that an increase in spindle speed and decrease in feed rate caused an increase in bone temperature. Also, with an increase in drill point angle from 70 to 118 degrees, the temperature increases by 10 degrees Celsius. Finally, the following combination of parameter values is suggested: feed rate of 90 to 120mm/min, spindle speeds of 200 to 2500rpm and point angle of 70˚ and 90˚. With irrigation, the decrease in temperature was almost equal to 9˚C.