title: Microleakage of CEM cement in two different media.
abstract: BACKGROUND
  Sealing ability of root-end filling materials is of great importance. It can be investigated by measuring microleakage. The purpose of this in vitro study was to evaluate microleakage of calcium enriched mixture (CEM) cement in two different media including phosphate buffer solution (PBS) and distilled water.
  
  
  METHODS
  Twenty single-rooted human teeth were selected. All teeth were root-end filled with CEM cement. Samples were divided into two groups of 10 each and were placed in PBS or distilled water. The microleakage was measured after 12 and 24 h, 14 and 30 days with Fluid Filtration device. Data were statistically analyzed by repeated measures test.
  
  
  RESULTS
  Sealing ability of CEM cement was significantly superior in PBS compared to distilled water (P<0.05). This study also showed that time had no significant effect on the sealing ability of CEM cement.
  
  
  CONCLUSIONS
  Media can significantly affect the microleakage of CEM cement. PBS can provide more phosphorous ions for hydroxyapatite formation of CEM cement; therefore, CEM cement can seal more effectively with PBS.
authors.affiliation: Dental Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Ghorbani
authors.forename: Sanam
authors.initials: S
authors.lastname: Kheirieh
authors.forename: Bahareh
authors.initials: B
authors.lastname: Shadman
authors.forename: Mohammad Jafar
authors.initials: MJ
authors.lastname: Eghbal
authors.forename: Saeed
authors.initials: S
authors.lastname: Asgary
keywords: CEM cement; Distilled water; Fluid filtration; Microleakage; NEC; PBS; Root-end filling