title: Retrograde root filling with composite and a dentin-bonding agent. 1.
abstract: A method is described, by which retrograde root filling with a composite resin can be performed. The cavity design is a slightly concave dissection of the apical part of the root, which is treated with the bonding agent Gluma followed by an application of Retroplast. Retroplast is a chemically curable composite containing silver for radiopacity and aerosil to obtain a suitable consistency. Endodontically treated teeth with a eugenol-containing root canal sealer did not affect the strength of the bond between Retroplast and apical dentin. A tight seal between the composite and the cavity surface was observed by light and SEM microscopy, and histology of tissue surrounding fillings placed in monkeys revealed absence of inflammatory cells around the filling and a close contact between filling and fibroblasts with collagenous fibers. In some cases, cementum and Sharpey's fibers formed in contact with the filling. Fillings placed in humans performed successfully in most cases, and the main causes of failure were either inadequate hemostasis during filling, or root fracture unnoticed by the time of filling. The retrograde technique promises a new treatment principle, with a root canal effectively sealed and the periapical ligament restored after apicoectomy.
authors.affiliation: Department of Dental Materials and Technology, Royal Dental College, Copenhagen.
authors.forename: J
authors.initials: J
authors.lastname: Rud
authors.forename: E C
authors.initials: EC
authors.lastname: Munksgaard
authors.forename: J O
authors.initials: JO
authors.lastname: Andreasen
authors.forename: V
authors.initials: V
authors.lastname: Rud
authors.forename: E
authors.initials: E
authors.lastname: Asmussen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001672:Biocompatible Materials; D017438:Bisphenol A-Glycidyl Methacrylate; D002522:Chlorocebus aethiops; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure; D004368:Dry Socket / Q000209:etiology; D005260:Female; D005976:Glutaral; D006801:Humans; D008297:Male; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011109:Polymethacrylic Acids; D012184:Retrograde Obturation / Q000379:methods*; D012387:Root Canal Filling Materials; D012834:Silver; D013718:Tensile Strength
chemical_list: D001672:Biocompatible Materials; D003188:Composite Resins; D011109:Polymethacrylic Acids; D012387:Root Canal Filling Materials; D012834:Silver; D017438:Bisphenol A-Glycidyl Methacrylate; C044372:Gluma; D005976:Glutaral