Resumo

CORREA PESCE, Ana Lucia; GONZALEZ LOPEZ, Santiago  e  GONZALEZ RODRIGUEZ, María Paloma. Effect of post space preparation on apical seal: Influence of time interval and sealer. Med. oral patol. oral cir.bucal (Internet) [online]. 2007, vol.12, n.6, pp.464-468. ISSN 1698-6946.

Objective: To assess the efficacy of two sealants to preserve the apical seal after root canal preparation and cementation of posts at 24 h or 72 h after endodontic treatment. Study design: Sixty human single-root teeth were instrumented and obturated using lateral compaction technique with EndoFill^® [30] or AH-Plus^® [30] and were prepared in one of three ways, leaving a 3 mm gutta percha remnant in all cases: without cast post preparation, with preparation after 24 h or after 72 h. After cementing the posts, the specimens were thermal cycled at 5 and 55˚C in water baths, submerged in 2% methylene blue dye for 72 h, embedded in acrylic resin and cut transversally into three 1-mm apical sections. Dye leakage was quantitatively assessed as the percentage leaked area. Results and conclusion: Comparison of the apical sections showed significant differences in leakage with both sealers among the three preparation groups (p<0.001). No significant differences between sealers were found in any preparation group or in the same sections.

Palavras-chave : Apical leakage; post space; apical seal; post preparation.

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