ABSTRACT
When cutting tools, as drills, are used to cut a material, heat is produced and temperature increases of both the tool and material. The drilling parameters (drill speed, drill depth, drill diameter, applied load and feed rate) are important to determine the effect on thermal necrosis. When the irrigation is possible, the effect is decreasing the temperature rise in bone (Davidson, 1999). Bone is a poor conductor of heat, and heat generation is a common problem during any type of drilling (Hillery, 1999). The value on the threshold of temperature above which cell necrosis occurs have been presented by different researchers. The literature shows that if the temperature rises above 55◦C for a period of longer than 30s, serious bone damage will be done (Hillery, 1999).
