Resumo

MARRA, Sara Teodoro; OLIVEIRA, Maria Antonieta Veloso Carvalho de  e  BIFFII, João Carlos Gabrielli. Influence of calcium hydroxide remains on marginal leakage of filled standard root sections. RGO, Rev. gaúch. odontol. (Online) [online]. 2012, vol.60, n.4, pp. 443-448. ISSN 1981-8637.

Objective To evaluate the influence of calcium hydroxide on the degree of marginal leakage in roots filled with two different types of sealers. Methods Roots of single-rooted bovine teeth (n=54) were instrumented and divided into four groups of 12 samples each: G1 and G2 were filled with zinc oxide-eugenol sealer, G3 and G4 filled with resin calcium hydroxide based-sealer. The G1 and G3 received calcium hydroxide intracanal medication for seven days. After removal of the medication, samples of the four groups were filled using the lateral condensation technique. The six remaining roots underwent biomechanical preparation, but received no medication or filling, serving as a control group. The apical third and part of the middle third were cut, leaving just 6mm in total length. The specimens were immersed in India ink for 72 hours. Cross sections were made to determine the length and depth of penetration of the dye and were quantified macroscopically with the software ImageTool 3.00. Results The results showed no statistical difference (p <0.05) with the groups that were filled with resin calcium hydroxide based-sealer, regardless of previous use of intracanal medication or not. However when the filling was made with zinc oxide-eugenol sealer, dye penetration was higher in the group that received no intracanal medication. Conclusion The presence of residues of calcium hydroxide only had an influence on leakage when the sealer was made with zinc oxide-eugenol.

Palavras-chave : Calcium hydroxide.; Coloring agents.; Dental leakage..