ABSTRACT
The purpose of this study was to evaluate external root surface temperature rise during post space preparation using LA Axxess bur, Beefill pack System, and Peeso Reamer drill. The distal canals of forty-five extracted human permanent mandibular first molars were instrumented in crown-apical manner and obturated with lateral condensation technique. Teeth were then randomly divided into three groups according to post space preparation technique including: group 1. LA Axxess bur [Sybronendo Co., CA, USA], group 2 Beefill pack System [VD W Co., Munich, Germany] and group 3 Peeso Reamer drill [Mani Co., Tochigi-ken, Japan]. Temperature was measured by means of digital thermometer MT-405 [Comercio Co., Sao Paulo, Brazil] which was installed on the root surfaces. Data was collected and submitted to one-way ANOVA and Post hoc analysis. Root surface temperatures were found to be significantly higher [7.3 +/- 2.7 vs. 4.3 +/- 2.1 and 4 +/- 2.4,] in samples of Beefill pack System compared with the two other groups [P<0.02]. Using Beefill pack System during post space preparation may be potentially hazardous for periodontal tissues