title: An assessment of coronal leakage of permanent filling materials in endodontically treated teeth: An in vitro study.
abstract: BACKGROUND
  The present in vitro study was undertaken to evaluate and compare the sealing ability of hybrid composite, glass ionomer cement type II, silver amalgam and Ketac molar as permanent filling material in root canal treated teeth.
  
  
  METHODS
  Hundred maxillary central incisors were selected for the study. After cleaning all the teeth, root canal treatment was carried out on all of them. The crown portion was cut-off at the cervical level. Three millimeter of coronal Gutta-percha was replaced by four different restorative materials. Then after thermocycling, samples were immersed in dye for 2 weeks. The amount of dye penetration was measured using stereomicroscope. Data were collected and analyzed statistically with ANOVA test and Student-Newman-Keuls test.
  
  
  RESULTS
  Coronal leakage was seen in all groups. Composite hybrid showed least amount of microleakage as compared to the other three experimental groups, and Ketac molar showed more leakage compared to other experimental groups.
  
  
  CONCLUSIONS
  This study showed that hybrid composites offer better sealing ability compared to other materials tested in this study.
authors.affiliation: Department of Conservative and Endodontics, Yenepoya Dental College, Mangalore, Karnataka, India.
authors.forename: Kishore
authors.initials: K
authors.lastname: Shetty
authors.affiliation: Department of Conservative and Endodontics, Yenepoya Dental College, Mangalore, Karnataka, India.
authors.forename: V Ashiq
authors.initials: VA
authors.lastname: Habib
authors.affiliation: Department of Conservative and Endodontics, Yenepoya Dental College, Mangalore, Karnataka, India.
authors.forename: S Vidhyadhara
authors.initials: SV
authors.lastname: Shetty
authors.affiliation: Department of Conservative and Endodontics, Yenepoya Dental College, Mangalore, Karnataka, India.
authors.forename: Jaishri N
authors.initials: JN
authors.lastname: Khed
authors.affiliation: Department of Oral Pathology, Yenepoya Dental College, Mangalore, Karnataka, India.
authors.forename: Vishnudas Dinesh
authors.initials: VD
authors.lastname: Prabhu
keywords: Coronal seal; Ketac molar; glass ionomer; hybrid composite; silver amalgam