title: Comparison of mineral trioxide aggregate's composition with Portland cements and a new endodontic cement.
abstract: The aim of this study was to compare the compositions of mineral trioxide aggregates (MTAs), Portland cements (PCs), and a new endodontic cement (NEC). Our study also investigated the surface characteristics of MTA and NEC root-end fillings when immersed in normal saline. For part I, we prepared samples of 9 brands of MTAs, PCs, and NEC. The materials were imaged and analyzed by scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA). In part II, 3-mm-deep root-end preparations were filled with MTA or NEC and stored in normal saline for 1 week. Samples were imaged and analyzed by SEM and electron probe microanalysis (EPMA). EDXA investigations revealed differences in the dominant compounds of NEC, PCs, and MTAs. The major components of MTA and PC are the same except for bismuth. The most significant difference was the presence of higher concentrations of Fe (minor element) in gray MTA and PC when compared with white ones. EPMA results revealed remarkably different elements in MTA compared with surrounding dentin, whereas in the NEC group the distribution patterns of calcium, phosphorous, and oxygen were comparable. NEC differs chemically from MTAs and PCs and demonstrates comparable surface composition with adjacent dentin as a root-end filling material.
authors.affiliation: Department of Endodontics, Iranian Center for Endodontic Research, Dental Research Center, Dental School, Shahid Beheshti University M.C., Tehran, Iran. saasgary@yahoo.com
authors.forename: Saeed
authors.initials: S
authors.lastname: Asgary
authors.forename: Mohammad Jafar
authors.initials: MJ
authors.lastname: Eghbal
authors.forename: Masoud
authors.initials: M
authors.lastname: Parirokh
authors.forename: Jamileh
authors.initials: J
authors.lastname: Ghoddusi
authors.forename: Sanam
authors.initials: S
authors.lastname: Kheirieh
authors.forename: Frank
authors.initials: F
authors.lastname: Brink
mesh_terms: D001729:Bismuth / Q000032:analysis; D003738:Dental Cements / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D006801:Humans; D007501:Iron / Q000032:analysis; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010758:Phosphorus / Q000032:analysis; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D003738:Dental Cements; D012387:Root Canal Filling Materials; C472247:accelerated Portland cement; D010758:Phosphorus; C033301:bismuth oxide; D007501:Iron; D001729:Bismuth