AvaliaÃÃo do tempo de recontaminaÃÃo de canais obturados com cones ProTaper utilizando diferentes tÃcnicas

AUTOR(ES)

Anizabele Milet do Amaral MercÃs

DATA DE PUBLICAÇÃO

2008

RESUMO

Objetive The aim of the present study was to assess the recontamination time of root canals filled with master Gutta-percha ProTaper point after exposure to human saliva. Methodology Fifty intact, caries-free, premolars with single roots and mature apices were selected for the study. After biomechanical preparation with the ProTaper Universalâ rotary system, they were randomly divided into four experimental groups according to the obturation techniques and the caliber of the master gutta-percha point, and two control groups. The roots were then sealed with three coats of cyanoacrylate, except for the apical 3 mm around the apical foramen, and mounted in the dual-chamber leakage apparatus. The dual-chamber leakage model system using Pseudomonas aeruginosa, Enterococcus faecalis, Escherichia coli and Staphylococcus aureus as microbial markers were used for leakage evaluation. Bacterial penetration was monitored over a 90-day period. Leakage was recorded when turbidity was observed in the lower chamber. The Kaplan-Meier and Long-Rank tests were employed to compare pairs of groups at the .05 level of significance. Results All specimens in the positive control group showed contamination within ten days of incubation, while negative control group showed no evidence of broth turbidity. The recontamination was detected between the 13th and 80th days in 22.5% of the specimens. The lateral compaction produced less infiltration than the single cone techniques. There were no statistically significant differences between the obturation techniques and the caliber of the gutta-percha master point. Conclusion It may be concluded that in the conditions of this study, there was no difference in bacterial penetration between the filling root canal techniques tested at 90 days

ASSUNTO(S)

lateral compactation obturaÃÃo dos canais radiculares tÃcnica do cone Ãnico ah plus protaper gutta-percha point economia infiltraÃÃo coronÃria protaper rotary system ah plus condensaÃÃo lateral single-cone technique protaper root canal filling

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