Resumo

PEREIRA, Rosana de Souza et al. Effectiveness of EDTA 17% in the removal of smear layer and calcium hydroxide dressing from the root canal walls. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.3, pp. 313-317. ISSN 1981-8637.

Objective To evaluate the effectiveness of EDTA 17% on the removal of the smear layer and the calcium hydroxide dressing in different thirds of the root canal. Methods Forty canines were instrumented in the cervical and middle thirds using Gates-Glidden drills. In the working length, enlargements were carried out with files up to #35 followed by scaling up to #50. After instrumentation, the teeth were divided into four groups according to the type of final irrigation: Group I - irrigation with 5 ml NaOCl 2.5%, Group II - irrigation with 5 ml EDTA 17% followed by irrigation with 5 ml NaOCl 2.5%; Group III - irrigation with 5 ml NaOCl 2.5%; Group IV - irrigation with 5ml EDTA 17% followed by one with NaOCl 2.5%. The teeth were filled and radiographed. The teeth were then submitted to the clearing technique and photographed by means of a camera coupled to a stereomicroscope. Results The images showed: Group I - the presence of smear layer in the three thirds and fewer accessory canals filled; group II - the smaller amount of smear layer on the cervical, middle and apical third and filling of the accessory canals; group III - there are residues from the dressing in the cervical, middle and apical third, and group IV - in all of the thirds there was a reduction in the presence of dressing remnants and the largest number of filled accessory canals. Conclusion It can be concluded that the use of EDTA 17% favored the removal of the smear layer and the remnants of the intracanal dressing in all thirds of the root canal.

Palavras-chave : Calcium hydroxide.; Dental pulp cavity.; Edetic acid.; Smear Layer..