الفهرس 
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Abstract
Objectives: The aim of study was to verify the effect of implant drill speed on bone from heat generation point of view, Ascond goal was to asses immediate bone viability histologically after surgical defect of bone tissue in rabbits. Materials and Methods: This experimental trail that was conducted on twenty adult healthy female rabbits. Animals were housed in separated cages as two rabbits per cage. Rabbits were kept in suitable conditions like temperature, humidity, standard food for rodents. In each rabbit 3 bony osteotomies were created in the femur 3 mm,3.5 mm and 4 mm diameters. Different speeds were used as the following .1. group I : speed 1000 rpm for the 3 diameters. 2. group II: speed 1500 rpm for the 3 diameters. 3. group III: speed 2000 rpm for the 3 diameters. 4. Group: Combination of speed 2000 rpm for the small diameters drills and speed 1000 rpm for the last large diameter. The initial temperature of bone recorded as T1 and the highest temperature rise after the last drill was recorded as T2.After surgery rabbits euthanized and bony samples collected for histological analysis. Results: Histological analysis showed more bone viability in the third and combination groups comparing to other groups. In addition, heat analysis showed less heat generation with higher speeds compared with the lower speeds.. Conclusion:In the current study it was found that, using higher speed in dense bone in the presence of irrigation generate less heat and preserve more bone vitality compared to lower speed.