title: SEM evaluation of neodentinal bridging after direct pulp protection with mineral trioxide aggregate.
abstract: The purpose of this study was to observe the basic morphology and determine the chemical composition of neodentinal bridges adjacent white mineral trioxide aggregate (WMTA) when used as a direct pulp capping material. The experimental procedures were performed on six intact dogs' teeth. The pulps were exposed and cavities were filled with WMTA. After 2 weeks, neodentinal bridge formation was evaluated by scanning electron microscope (SEM) of cross-sections of the specimens and electron probe microanalysis (EPMA) of the pulpal surfaces. Results of SEM observation showed that the most characteristic reaction of pulp cells was the intimate connection of cell processes and secreted extracellular fibres with the crystals of the pulp capping material. Results of EPMA indicated that the mineralisation of neodentinal bridge formation occurred progressively from the periphery to the central area. Based on these results, it appears that WMTA has the potential to be used as a direct pulp capping material during vital pulp therapy.
authors.affiliation: Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Saeed
authors.initials: S
authors.lastname: Asgary
authors.forename: Masoud
authors.initials: M
authors.lastname: Parirokh
authors.forename: Mohammad Jafar
authors.initials: MJ
authors.lastname: Eghbal
authors.forename: Jamileh
authors.initials: J
authors.lastname: Ghoddusi
authors.forename: Ali
authors.initials: A
authors.lastname: Eskandarizadeh
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry / Q000627:therapeutic use*; D000818:Animals; D002118:Calcium / Q000032:analysis; D017610:Calcium Compounds / Q000737:chemistry / Q000627:therapeutic use*; D002462:Cell Membrane / Q000648:ultrastructure; D003738:Dental Cements / Q000737:chemistry / Q000627:therapeutic use*; D003782:Dental Pulp / Q000473:pathology; D003785:Dental Pulp Capping; D003789:Dental Pulp Exposure / Q000188:drug therapy; D003809:Dentin, Secondary / Q000737:chemistry / Q000648:ultrastructure*; D004285:Dogs; D004338:Drug Combinations; D004577:Electron Probe Microanalysis; D005109:Extracellular Matrix / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry / Q000627:therapeutic use*; D010758:Phosphorus / Q000032:analysis; D017640:Silicates / Q000737:chemistry / Q000627:therapeutic use*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003738:Dental Cements; D004338:Drug Combinations; D010087:Oxides; D017640:Silicates; C086631:mineral trioxide aggregate; D010758:Phosphorus; D002118:Calcium