A Comparative Study of Smear Layer Removal Using Different Salts of EDTA

Abstract

Three solutions of EDTA--a 15% concentration of the alkaline salt, a 15% concentration of the acid salt, and a 25% concentration of the alkaline salt--were evaluated for smear layer removal in root canal systems. All solutions were adjusted to pH 7.1 using either NaOH or HCl. When the EDTA solutions were alternately used for root canal irrigation with 5.25% NaOCl, they completely removed the smear layer in the middle and coronal thirds of canal preparations, but were less effective in the apical third. None of the EDTA solutions by themselves were effective at completely removing the smear layer at any level. The alkaline tetrasodium salt, pH adjusted with HCl, is more cost effective and performed equally as well as the more commonly used disodium salt.

Eradication of Intracanal Enterococcus Faecalis Biofilm by Passive Ultrasonic Irrigation and RinsEndo System

“…Najveći je problem složenost kanalnoga sustava zuba, što onemogućuje blizak kontakt sredstva za ispiranje sa stijenkama korijenskog kanala, a to je potrebno za učinkovito djelovanje antimikrobnog sredstva (6). Nadalje, dokazano je da sredstvo za ispiranje dopire do 1 mm od vrha igle (7), a s obzirom na to da se igla obično postavlja u koronarnu ili srednju trećinu kanala (8) upitno je antimikrobno djelovanje irigansa u apikalnoj trećini (7). Zbog toga se istražuju novi načini ispiranja korijenskog kanala koji bi omogućili prodiranje irigansa u apikalnu trećinu.…”

“…The main problem is the complexity of the root canal space that hinders direct contact of the irrigant with internal root surfaces, which is necessary for effective action of antimicrobial irrigants (6). Moreover, it has been shown that an irrigant is delivered only 1 mm deeper than the tip of the needle (7), and the needle tip is usually located in the coronal or middle third of the canal (8), hence the antimicrobial efficacy of the irrigant is questionable in the apical region (7). Therefore, attention has been given to the construction and investigation of new irrigation devices that would deliver irrigant to all intracanal areas.…”

Estudo da Ação do Edta Sobre a Camada Residual no Tempo de 1 e 3 Minutos

“…Este material denominado, freqüentemente, de camada residual é também conhecido como lama denti nária, barro denti nário ou smear layer. Possui a aparência amorfa, irregular e granulosa quando examinada ao Microscópio Eletrônico de Varredura 3,[16][17][18][19][20][21][22][23] . A camada residual não é uma barreira intransponível às bactérias, esta apenas retarda 19 .…”

Smear Layer Removal Efficacy Of Different Irrigation Techniques

“…Ayrıca, her üç sistemin de tüm bölgelerde smear tabakasını uzaklaştırma etkinlikleri arasında istatistiksel farklılık saptanmadı (p>0.05). O'Connell ve arkadaşları 19 …”