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Thermal damage in bone tissue is a common problem in drilling processes. The main goal of this work is to analyze the cutting conditions that generate the lower temperature, avoiding the occurrence of thermal bone necrosis. In this work, the effects of the drill speed and the feed-rate were studied during the drilling of cor-tical bovine and porcine bone tissue. In the ex vivo drilling operations, two methodologies were performed on several fresh femur bone samples. The present study showed that the combinations of cutting conditions in the drilling process of ex vivo corti-cal bovine and porcine bone tissue, produced temperatures far below the critical values. It was concluded that the temperature increases with an increasing drill speed and decreases with high feed-rates. To the drill speed, the difference is less clear than that the feed-rate. The drilling temperatures on the bovine samples were higher than porcine samples. info:eu-repo/semantics/publishedVersion

In an ageing society it’s inevitable that the bone fractures occur with increasing frequency. Usually, the fracture treatment involves bone drilling for screw insertion to fix the fractured parts for immobilization. However, high rotational speeds may cause a high rise in bone temperature. It is generally agreed that temperatures above 55°C for a period longer than 30 seconds are deleterious to the bone tissue and leads to the irreversible death of cells. Decrease the heat generation has a great demand as it helps in better fixation and healing of bone tissue. info:eu-repo/semantics/publishedVersion

In medicine there are many surgical procedures that involve the bone tissue, often entail cutting, drilling or screwing operations of the bone. The success of these surgeries depends on many factors and the bone damage degree generated during the drilling. The cutting effort achieved during the drilling process is one of the problems and is directly related with the drilling parameters. It is essential to understand and to improve the cutting conditions to minimize the bone damage.

Bone is a dynamic, highly vascularized tissue with a unique capacity to heal and regenerate without scarring. However, drilling remains a concern in several clinical procedures due to thermal damage of the bone and surrounding tissue. The success of this surgeries is dependent of many factors and also in temperature generation during the drilling bone. When an excessive heat is produced during the drilling, thermal necrosis can occur and the bone suffers injuries. Studies have shown that the increased temperature is directly related with the drilling parameters, particularly, the drill speed, feed-rate, applied force, the depth of cut, the geometry of the drill bit, the use or not of a cooling system and also the type of bone.

The drilling bone process is a common surgical procedure on medicine. The main concern in these surgeries is the thermal damage of the bone tissue induced by inappropriate parameters [1]. Objectives:  Analyze the optimum cutting conditions that generate the lower temperature.  Drill speed and the feed-rate effects were studied during the drilling of animal bones.  Experimental tests were performed in laboratory and clinical environment.