Evaluation of dentinal tubule penetration depth and push-out bond strength of AH 26 BioRoot RCS and MTA Plus root canal sealers in presence or absence of smear layer

摘要

>Background. This study compared the effect of smear layer on the penetration depth and push-out bond strength of various root canal sealers. >Methods. A total of 90 extracted human mandibular premolars were assigned into 2 groups: smear layer preserved and smear layer removed. Then the roots were further divided into 3 subgroups according to the sealer tested: AH 26, BioRoot RCS and MTA Plus. Obturation was performed with gutta-percha and the relevant sealer was mixed with 0.1% rhodamine B. Three 1-mm-thick slices were obtained from the mid-third area of each root. Two slices were selected for the push-out test and the remaining slice was used to calculate the dentinal tubule penetration depth and percentage. >Results. The retention of MTA Plus and BioRoot RCS was higher than that of AH 26 when the smear layer was preserved (P<0.05). BioRoot RCS showed the lowest penetration depth when the smear layer was removed (P<0.05). >Conclusion. Dentinal tubule penetration of root canal sealers had a limited effect on their adhesion to root canal wall.