title: Adhesive sealing of the pulp chamber.
abstract: The purpose of this in vitro study was to evaluate quantitatively the ability of four different filling materials to seal the orifices of root canals as a secondary seal after root canal therapy. Forty extracted human molar teeth were used. The top of pulp chambers and distal halves of the roots were removed using an Isomet saw. The canal orifices were temporarily sealed with a gutta-percha master cone without sealer. The pulp chambers were then treated with a self-etching primer adhesive system (Clearfil SE Bond), a wet bonding system (One-Step), a 4-methacryloyloxyethyl trimellitate anhydride adhesive system (C&B Metabond), or a reinforced zinc oxide-eugenol (IRM). The specimens were randomly divided into four groups of 10 each. A fluid filtration method was used for quantitative evaluation of leakage. Measurements of fluid movement were made at 2-min intervals for 8 min. The quality of the seal of each specimen was measured by fluid filtration immediately and after 1 day, 1 wk, and 1 month. Even after 1 month the resins showed an excellent seal. Zinc oxide-eugenol had significantly more leakage when compared with the resin systems (p < 0.05). Adhesive resins should be considered as a secondary seal to prevent intraorifice microleakage.
authors.affiliation: Department of Operative Dentistry, Selcuk University, Dental School, Konya, Turkey.
authors.forename: S
authors.initials: S
authors.lastname: Belli
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: P N
authors.initials: PN
authors.lastname: Pereira
authors.forename: D H
authors.initials: DH
authors.lastname: Pashley
mesh_terms: D000704:Analysis of Variance; D001896:Boron Compounds; D003763:Dental Leakage / Q000517:prevention & control*; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D008137:Longitudinal Studies; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D008963:Molar; D011897:Random Allocation; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric; D015035:Zinc Oxide-Eugenol Cement
chemical_list: C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D001896:Boron Compounds; C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D019279:Resin Cements; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C031667:IRM cement; C049495:Super-bond