Objectives: The aim of this investigation was to develop a thermocouple device associated to an integrated system for computerized thermical registration and supervision, used to evaluate the internal and external cooling system performance. Methods: The data was collected from the analysis of twenty specimens of bovine bone submitted to different drilling conditions and different positions of the heat aquisition device (thermocouple). Ten specimens were instrumented with 3i drills (Twist Drill Ø 2,3mm, Tri-Spade Twist Ø 3,0mm and a Pilot Drill Ø 2x3mm) and were irrigated externally. The remaining specimens were instrumented by the same sequence of drills but the cooling system of choice was the internal irrigation. The data collected were submited to statistical analysis by the ANOVA2 test and the correlations refined by means of the Tukey (HSD). Results: When a 2,3mm diameter drill was used, the greatest changes in temperature were observed between the initial and final time of drilling (average 0,470°C). When comparing the pilot drill to the 3,0mm drill it was displayed that results were statiscally equivalent. There were no evidence of superiority between two types of instrumentation investigated. Alternatively, when different drills and cooling systems were tested, it was shown that the 2,3mm drill produced the greatest differences of heat generation between the initial and final drilling times among the other types of situation tested. Conclusion: The authors concluded that the thermocouple device was efficient in measuring bone temperature suggesting a viability in associating it to implant dentistry drillers, and that the internal irrigation generated less heat than external irrigation.

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