Resumo

SANCHEZ ORTEGA, Jeannette; GUERRERO, Jorge; ELORZA, Haroldo  e  GARCIA ARANDA, Raúl Luis. Calcium hydroxide influence and intrachannel medication in apical leakage. Rev. Odont. Mex [online]. 2011, vol.15, n.4, pp.224-230. ISSN 1870-199X.

The purpose of this study was to determine the amount of remaining Ca(OH)₂ after three removal techniques as well as determining its influence on apical seal. Eighty extracted mandibular premolars were prepared with ProTaper system^®, dressed with Ca(OH)₂ paste and stored 10% humidity at 37 °C for 7 days. Experimental groups according to the removal technique were: NaCIO 2.5% + EDTA (G1), NaCIO 2.5% + EDTA 18% and ultrasonic activation (G2); NaCIO and ultrasonic activation (G3). Forty teeth were longitudinally split in order to measure remaining Ca(OH)₂. The other 40 specimens were obturated with ultrasonic condensation of gutta-percha technique. These teeth were cleared and apical leakage was measured. Statistical analysis showed difference among groups with respect to Ca(OH)₂ removal (P < 0.03), Group G2 showed least amount of remaining Ca(OH)₂. Likewise, leakage results showed statistical difference among groups (P < 0.01). Group 2 showed best results with respect to leakage. There was no statistical difference between groups 1 and 3. Conclusion: Irrigation with NaCIO 2.5% EDTA 18% and ultrasonic activation proved to be most effective in removing Ca(OH)₂ from canal walls. Calcium hydroxide medication residuals inside canals might increase apical leakage.

Palavras-chave : Apical leakage; calcium hydroxide; intracanal medication; ultrasonic activation; sodium hypochloride; EDTA.

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