NERO, André Luís Del; GEHRKE, Sérgio Alexandre; JR, Nilton De Bortoli    ZANATTA, Luiz Carlos. Temperature during drilling bone. Comparative study of the irrigation techniques. []. , 66, 2, pp. 147-150. ISSN 0004-5276.

The drilling bone in implantology is an event that demands a lot of care with respect to the control of temperature increase. By using thermocouples, the highest temperatures reached in medular and cortical bones of bovine femur were measured during osteotomies to install osseointegrated implants. It was performed 32 perforations with rotational speed of the drill in 1200 rpm, 15 mm of depth, 35 N torque, 2 Kg-load and helicoid drills with 2 mm of diameter. To measure the temperature of the bone were used two type K thermocouples attached to a portable digital thermometer, and a cortical bone 3 mm in depth (thermocouple 1), and the second 15 mm deep in the bone marrow (thermocouple 2). In half of the total number of the perforations it was used the double-irrigation technique which promotes the external irrigation and also allows flowing of irrigating solution inside the drill. In the other 16 perforations it was used only the external irrigation to reduce the heat generated during the perforation. The results prove that temperature increases most in the cortical bone despite the perforation depth and in comparison with the external irrigation only, the double-irrigation technique is more efficient to control the heating during osteotomies decreasing the risk of overheating and consequent bone injuries.

: osteotomy; maximum temperature; dental implants; osseointegration; surgical instruments.