Resumo

MORENO GONZALEZ, Vera A; ARGUELLO REGALADO, Gustavo  e  PEREZ TEJADA, Haroldo Elorza. Assessment of apical sealing of three warm obturation techniques in the presence of fractured NiTi rotary instruments. Rev. Odont. Mex [online]. 2013, vol.17, n.1, pp.20-25. ISSN 1870-199X.

The purpose of the present study was to compare the sealing ability of three warm obturation techniques (thermo-plasticized gutta-percha): Schilders warm vertical compaction, McSpadden's thermo-mechanical compaction and Thermafil (Dentsply-Maillefer) in teeth fractured at the apical region. 30 extracted, single-rooted teeth were prepared with Pro-Taper (Dentsply-Maillefer). At the apical third of each of these teeth, ProTaper F3 rotary instruments were deliberately fractured. Teeth were randomly divided into three groups (n = 10) to be later filled with the selected technique, so that with dye penetration technique and with the aid of discoloring teeth technique, teeth could be microscopically assessed so as to determine the amount of apical microfiltration elicited in every technique. In all groups, specimens presented some degree of apical microfiltration. Teeth filled with Thermafil presented 3,134 µm average microfiltration. This microfiltration was significantly higher than the one observed with McSpadden thermo-mechanical technique and Schilder's vertical compaction technique (p < 0.05). These two techniques presented 1,934 µm and 2,083 µm respectively. McSpadden and Schilder's technique show no statistically significant microfiltration differences (p > 0.05).

Palavras-chave : Microfiltration; sealing; instrument fracture; obturation.