The effect of low-speed drilling without irrigation on heat generation: an experimental study

controlled by low-speed drilling.Kim et al. 1 measured the temperature change in pig rib bone during implant site preparation by drilling at 50 rpm without irrigation and reported that drilling at 50 rpm without irrigation did not produce overheating.In the study, the animal bone without a uniform cortical layer was used.In an attempt to provide more rigorous data, in this study we evaluated heat generation during the low-speed drilling procedure without irrigation. II. Materials and MethodsThis in vitro study was designed to simulate the clinical conditions involved in implant site preparation.A total of 10 artificial bone blocks (solid rigid polyurethane foam; Sawbones, Vashon Island, WA, USA) similar to human D1 bone were used in this study.(Fig.1) The artificial block bone D1 was based on The American Society for Testing and Materials.The blocks consisted of both the cortical layer (thickness, 3 mm; density, 0.8 g/mL) and the cancellous layer (thickness, 15 mm; density, 0.48 g/mL).Drill guides, which could accurately guide drills into their predetermined locations and orientations were designed and fabricated to be placed on the blocks.