A influência do diâmetro apical na eficácia do localizador eletrônico Novapex: estudo ex-vivo

Abstract

The aim of this ex vivo study was to compare the electronic measure (EM) with the real measure of the tooth and to evaluate the influence of the apical diameter and the instrument caliber in determining the length of the tooth by the electronic locator (EL) NOVAPEX. Twenty single root teeth and an apparatus with alginate/ physiological sodium chloride have been used. The real measure of the teeth was determined by the apical visualization of a Kerr file (LK) #10 (Group A). The EM has been divided in seven groups: Group B (EM using LK #15); Group C (EM using LK #15) and Group C1 (EM using LK #50), both after the foraminal enlargement until 0,50mm; Group D (EM using LK#15) and Group D1 (EM using LK #60), both after the foraminal enlargement until 0,60mm; Group E (EM using LK #15) and Group E1 (EM using LK #80), both after the foraminal enlargement until 0,80mm. The groups have been compared by the Student paired t test. The results do not reveal significant statistically differences (p > 0,05) between the Groups A and B, considering a tolerance of 0,5mm between those measures, as well as between the Group B and the Groups C, C1, D and D1. Nevertheless, comparing the Group B with the Groups E and E1 there was a significant difference (p < 0,05). It was concluded that the EM with the EL Novapex is equal to the real measure and that the determination of the tooth length is influenced by the apical diameter, however, the instrument caliber does not influence the ME.