Resumo

PEREZ HEREDIA, Mercedes; CLAVERO GONZALEZ, Javier; FERRER LUQUE, Carmen María  e  GONZALEZ RODRIGUEZ, María Paloma. Apical seal comparison of low-temperature thermoplasticized gutta-percha technique and lateral condensation with two different master cones. Med. oral patol. oral cir.bucal (Internet) [online]. 2007, vol.12, n.2, pp.175-179. ISSN 1698-6946.

Aim: To compare the apical sealing in mesio-buccal canals of extracted molars obturated with low-temperature thermoplasticized gutta-percha or cold lateral condensation techniques using a .06 or a .02 mm/mm tapered gutta-percha master cone. The secondary aim was to evaluate the depth of spreader penetration in root canals using a .06 or a .02 mm/mm tapered gutta-percha master cone. Methodology: Forty-four mesio-buccal curved canals (25-40º) were instrumented with .06 nickel-titanium rotary instruments and randomly distributed into two control groups (n=4) and three experimental groups (n=12) for obturation by the Ultrafil^® 3D system or by cold lateral condensation with .06 or .02 tapered master cone. Canal sealer AH-Plus^® was used. The depth of spreader penetration was recorded in millimetres. Roots were covered with two layers of nail polish, immersed in India ink for 7 days, transversally sectioned and examined with a stereomicroscope. Student’s t test was used to determine whether there was a difference in spreader penetration between groups. Kruskal-Wallis test was used to determine whether there was a difference in leakage. Results: There were no differences among the three groups (p=0.396), which showed a very similar mean microleakage (0.42, 0.75 and 0.42). The difference in spreader penetration between the groups filled by cold lateral condensation was significant (p=0.001) Conclusion: The Ultrafil^® 3D system and cold lateral condensation techniques with .06 or .02 tapered master cones were equally effective in the apical sealing of curved canals. The spreader penetrated deeper using a .02 mm/mm tapered gutta-percha master cone.

Palavras-chave : Root canals filling; cold lateral condensation; thermoplasticized gutta-percha.

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