Abstract
BackgroundDrilling is one of the most widely used process in orthopaedic surgical operation and the same drill bit is used a number of times in hospitals. Using the same drill bit a several times may be the cause of osteosynthesis and osteonecrosis.MethodsIn the present work, the effect of repeated orthopaedic surgical twist drill bit on the tool wear, force, torque, temperature and chip morphology during porcine cortical bone drilling is studied. Results were compared with rotary ultrasonic drilling (RUD) on the same bone using a hollow drill tool coated with diamond grains. A sequence of 200 experiments (100 with each process, RUD and CD) were performed with constant process parameters.ResultsWear area on the drill bit is significantly increased as the drill bit is used repeatedly in CD, whereas no attritious wear was found on the diamond coated grains in RUD.ConclusionsComparative results showed that cutting force, torque and temperature increased as a function of tool wear in CD as the same drill bit was used a number of times. No significant variation in the cutting force and torque was observed in RUD as the number of drilled holes increased.
Highlights
Drilling is one of the most widely used process in orthopaedic surgical operation and the same drill bit is used a number of times in hospitals
A significant tool wear is formed on the cutting edges of the drill bit due to reuse, which may lead to increase in the frictional forces and heat between the bone and the drill bit
The aim of the present study is to introduce the rotary ultrasonic drilling (RUD) on bone and to investigate the effect of tool wear on the cutting performance
Summary
Drilling is one of the most widely used process in orthopaedic surgical operation and the same drill bit is used a number of times in hospitals. (Allan et al 2005) performed in vitro study on a pig mandible to investigate the effects of drill wear on the change in bone cutting temperature using 3 different drill bits (n = 0, n =600 holes drilled, n = used many times in operation theater). They reported that with increase in the (Oliveira et al 2012) conducted drilling experiments on bovine bone with twisted stainless steel and ceramic drills to find out the relation between the thermal changes and drill wear. It was concluded that stainless steel drill bit had more tip wear as compared to the ceramic drill bit
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