Under the conditions of these in vitro leakage studies , it is concluded that smear layer removal improves the fluid-tight seal of the root canal system whereas other factors such as the obturation technique or the sealer , did not produce significant effects
The purpose of this systematic review was to determine whether smear layer removal reduces leakage of obturated human teeth in vitro .
Sealability of the Trifecta technique in the presence or absence of a smear layer.
The aim of this in vitro study was to assess the sealability of a recently introduced thermoplasticized gutta-percha technique ( Trifecta , Hygenic Corp. , OH , USA ) in the presence or absence of a smear layer . A total of 100 teeth with single straight root canals were included in the study . The teeth were decoronated and the canals prepared with a modified double-flared technique under constant irrigation with 2.5 % sodium hypochlorite solution . The apical matrix was prepared to size 40 and apical patency subsequently confirmed with a size 10 file . Four teeth were discarded for technical reasons and the remaining 96 allocated r and omly into two groups of 44 teeth and a group of eight teeth which acted as controls . Canals in group 1 were obturated r and omly with either cold lateral condensation of gutta-percha or with the Trifecta technique . Canals in Group 2 were rinsed with 17 % REDTA to remove the smear layer and then obturated with lateral condensation or the Trifecta technique . All teeth were suspended in India ink for 9 days , demineralized , and rendered transparent prior to the assessment of apical linear dye penetration . Apical extrusion of sealer and gutta-percha occurred commonly but there was no significant difference between the four obturation groups . However , overall , there was significantly more extrusion of sealer with the Trifecta technique compared with lateral condensation ( P < 0.05 ) . The majority of canals ( 79 out of 88 ) had no evidence of apical leakage and there was no significant difference between the groups . ( ABSTRACT TRUNCATED AT 250 WORDS
Under the conditions of these in vitro leakage studies , it is concluded that smear layer removal improves the fluid-tight seal of the root canal system whereas other factors such as the obturation technique or the sealer , did not produce significant effects
The purpose of this systematic review was to determine whether smear layer removal reduces leakage of obturated human teeth in vitro .