The influence of drill wear on cutting efficiency and heat production during osteotomy preparation for dental implants: a study of drill durability.

摘要: PURPOSE: The authors evaluated, under conditions simulating implant placement, the cutting efficiency, durability, heat production, and wear of drills. MATERIALS AND METHODS: Osteotomies were performed on bovine ribs using a surgical unit mounted in testing apparatus. A software program controlled apparatus recorded temperatures, depths, drilling times. Seven brands drills tested (Nobel Biocare, 3i/Implant Innovations, Steri-Oss, Paragon, Implamed, Lifecore, ITI). Spade, twist, tri-flute, TiN-coated drill designs evaluated compared during 100 successive osteotomies. Scanning electron microscopic energy-dispersive x-ray spectroscopic examinations performed, hardness was measured. RESULTS: Two 2-mm Biocare Innovations) had mean removal rates significantly greater than others (P < .05). twist design with low (Implamed) exhibited plastic deformation at edge, loss fracture. (Steri-Oss Paragon) showed lower .05) noncoated Temperature increases different not depths 5 or 15 mm between 3-mm With 1 exception (the 2.3-mm Paragon depth mm), temperatures generated by types different. Clinically harmful detected only osteotomies coincided marked decrease rate advancement resulting continuous action. DISCUSSION: Temperatures diameters and, exceptions, clinically safe. Several differences noted regard to efficiency underscoring importance material selection quality performance. CONCLUSIONS: Drill design, material, mechanical properties affect durability. Coolant availability temperature predominant factors determining bone temperatures. Implant can be used several times without that are potentially harmful. Continuous deep produce local might bone.