Avaliação da temperatura desenvolvida durante a remoção de pino intra-radicular, com instrumentos cortantes rotatórios em alta rotação

Due to the concern with the damaging effects of heat distribution on periodontal tissues, this study had the objective of evaluating the temperature generated during the removal of posts with burs in high speed handpieces. Fixed thermopars around the medium and apical regions of the roots of extracted superior central incisors, connected to digital thermometers, were used to obtain temperature measurements during wearing down. Analysis of variance demonstrated a statistically significant difference, to the level of 5%, between the regions where the temperature was taken and the alloys used. When comparing the differences between the regions of roots, the medium portion presented a variation of 9.1oC, and the apical region recorded a 6.2oC amplitude. The alloy containing CuAlZn (GOLDENT) reached the largest amplitude, 10.3oC; the alloys made of CuAl (DURACAST), 6.3oC; and the one made of PdAg (PORS-ON4), also 6.3oC. The factors that probably interfered were: degree of refrigeration, pressure, and intermittent wearing down. Based on the methodology used, we may conclude that the removal of posts by using burs in high speed can generate critical temperature variations, depending on the region of the root and the alloy being used.