title: Scanning electron microscopy and energy dispersive analysis of machined denture base surfaces.
abstract: To relate the characteristics of rotary instruments to the surfaces they produce, acrylic resin, Molloplast B, and Novus were investigated with energy dispersive analysis and scanning electron microscopy (secondary and backscatter images) before and after machining. The chemical composition of cutting instruments, material surfaces, and residues was identified. Machined debris embedded in Molloplast B after machining with the Molloplast stone was found to contain a mean lead content of 45%. High concentrations of barium sulphate were discovered on the arbor band-machined surface of Novus. These differences were related to clinically appropriate instrumentation, and, therefore, biocompatibility studies that intimately relate to the in vivo situation should be considered for new materials.
authors.affiliation: Department of Prosthetic Dentistry, Guys Dental Hospital, London, United Kingdom.
authors.forename: D R
authors.initials: DR
authors.lastname: Radford
authors.forename: J D
authors.initials: JD
authors.lastname: Walter
authors.forename: S J
authors.initials: SJ
authors.lastname: Challacombe
mesh_terms: D003775:Dental Polishing / Q000295:instrumentation*; D003819:Denture Bases; D003822:Denture Liners; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004577:Electron Probe Microanalysis; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009943:Organophosphorus Compounds / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry; D013499:Surface Properties; D013674:Technology, Dental / Q000295:instrumentation
chemical_list: D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; D008768:Methylmethacrylates; D009943:Organophosphorus Compounds; D011108:Polymers; D012826:Silicone Elastomers; C076789:polyphosphazene fluoroelastomer; C029883:Trevalon universal