title: Evaluation of the influence of smear layer on the apical and coronal sealing ability of two sealers.
abstract: The aim of this in vitro study was to determine the effect of the smear layer on apical and coronal leakage in root canals obturated with AH26 or RoekoSeal sealers. A total of 160 maxillary anterior teeth extracted for periodontal reasons were used. The root canals were prepared to a size #7 with ProFile.06 taper Series 29 rotary instruments in a crown-down manner. Eight groups were created by all possible combinations of three factors: smear layer (present/absent), leakage assessment (apical/coronal), and sealer used (AH26/RoekoSeal). All teeth were obturated using lateral condensation technique of gutta-percha. A fluid filtration method was used to test apical or coronal leakage. According to the results of this study, the smear (+) groups displayed higher apical and coronal leakage than those smear (-) groups for both root canal sealers (p < 0.05). There was no statistically significant difference in either apical or coronal leakage between RoekoSeal and AH26, regardless of the presence or absence of the smear layer (p > 0.05). However, apical leakage was significantly higher than coronal leakage for both root canal sealers used in this study (p < 0.05). Under the conditions of this study, the results indicate that removal of the smear layer has a positive effect in reducing apical and coronal leakage for both AH26 and RoekoSeal root canal sealers.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Selçuk University, Campus 42075, Konya, Turkey. kfunda@selcuk.edu.tr
authors.forename: Funda Kont
authors.initials: FK
authors.lastname: Cobankara
authors.forename: Necdet
authors.initials: N
authors.lastname: Adanr
authors.forename: Sema
authors.initials: S
authors.lastname: Belli
mesh_terms: D001729:Bismuth / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003763:Dental Leakage / Q000145:classification*; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D015194:Diffusion Chambers, Culture; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation; D018915:Root Canal Preparation; D012834:Silver / Q000737:chemistry; D016369:Smear Layer; D014025:Titanium / Q000737:chemistry; D019227:Tooth Apex; D019228:Tooth Crown
chemical_list: D003738:Dental Cements; D004338:Drug Combinations; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C465381:roeko seal; D012834:Silver; C028044:epoxy resin AH-26; D006171:Gutta-Percha; D014025:Titanium; D001729:Bismuth