title: Intracoronal sealing ability of two dental cements.
abstract: The purpose of this study was to compare the efficacy of sealing the coronal 2-mm of the root canals versus covering the entire pulpal floor with one of two dental-resin cements (Principle or C&B Metabond). Sixty-two molars with the occlusal half of the crowns and the apical half of the roots removed were used. Each canal was enlarged by using a #3 Gates Glidden bur and obturated with unsealed gutta-percha cones. The teeth were randomly assigned to four groups, each containing 15 teeth, plus a negative and a positive control. In group 1, 2 mm of Principle were placed over the entire pulpal floor. In group 2, Principle was placed 2 mm into each canal orifice. Groups 3 and 4 were the same as groups 1 and 2, except C&B Metabond cement was used. After the cement set, the gutta-percha was removed and the integrity of the seal was tested by fluid filtration at a pressure of 20 cm H2O at 1 h and at 1, 2, and 4 weeks. The data were analyzed by a three-way ANOVA and the Student-Newman-Keuls tests at alpha = 0.05. The controls behaved as expected. Results showed that there were no statistically significant differences among the materials used or the location (p > 0.05), but there was a significant difference with respect to time. Principle leaked significantly more than C&B Metabond at 1 h (p < 0.05), but the seal became tighter over time. C&B Metabond leaked less early (p < 0.05) but increased in leakage at 4 weeks. Both materials sealed well over the 4-week study. Principle was easier to use, and sealing the entire pulpal floor was easier than sealing only the canal orifice.
authors.affiliation: Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta 30912-1244, USA.
authors.forename: John D
authors.initials: JD
authors.lastname: Wells
authors.forename: David H
authors.initials: DH
authors.lastname: Pashley
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Loushine
authors.forename: R Norman
authors.initials: RN
authors.lastname: Weller
authors.forename: W Frank
authors.initials: WF
authors.lastname: Kimbrough
authors.forename: Patricia N
authors.initials: PN
authors.lastname: Pereira
mesh_terms: D000704:Analysis of Variance; D001896:Boron Compounds; D020770:Compomers; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D008689:Methacrylates; D008768:Methylmethacrylates; D008963:Molar; D011897:Random Allocation; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric; D019228:Tooth Crown
chemical_list: D001896:Boron Compounds; D020770:Compomers; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D019279:Resin Cements; D012387:Root Canal Filling Materials; C465382:principle compomer; C049495:Super-bond