title: Coronal leakage: effects of smear layer, obturation technique, and sealer.
abstract: Coronal microleakage may be a major factor in the etiology of treatment failure. This study examined the effect of obturation technique, sealer, and the presence of smear layer on coronal microleakage. Two hundred extracted human teeth were assigned to 20 treatment groups. Groups were examined with the smear layer present or smear layer removed (17% REDTA). Access cavities were exposed to artificial saliva then Pelikan Ink. Teeth were cleared and linear dye penetration measured. When all groups with the smear layer removed were compared with all groups with the smear layer present, significantly less leakage was seen when the smear layer was removed. Ultrafil displayed significantly more leakage than all other groups. Vertical compaction of lateral condensation and Thermafil obturations significantly reduced leakage. AH-26 displayed significantly less leakage than Roth's 811 sealer. These results indicate that removal of the smear layer, the use of AH-26, and vertical compactin have cumulative effects in reducing coronal leakage.
authors.affiliation: LSU Medical Center, School of Dentistry, Department of Endodontics, New Orleans, LA 70119, USA.
authors.forename: J K
authors.initials: JK
authors.lastname: Taylor
authors.forename: B G
authors.initials: BG
authors.lastname: Jeansonne
authors.forename: R R
authors.initials: RR
authors.lastname: Lemon
mesh_terms: D000704:Analysis of Variance; D003763:Dental Leakage / Q000209:etiology* / Q000517:prevention & control; D004395:Dye Dilution Technique; D006801:Humans; D066298:In Vitro Techniques; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D016369:Smear Layer; D019228:Tooth Crown; D017211:Treatment Failure
chemical_list: D012387:Root Canal Filling Materials