title: Artefacts caused by dental filling materials in MR imaging.
abstract: An investigation regarding possible artefacts from dental filling materials in MR imaging is presented including 9 types of such materials from various manufacturers. Freshly extracted teeth were prepared and the filling materials were handled according to manufacturers' instructions. The teeth were encapsulated into a gel phantom based on de-ionized water, Ni (NO3)2 and polysaccharide agarose powder. The investigation was performed with a standard head coil and a 1.5 T MR unit. Images acquired with various combinations of parameters from different sequences were visually analysed regarding possible artefacts. The investigation showed that only one of the materials caused significant artefacts. The gel phantom was found to be a valuable means for examination of artefacts from small samples, and can be recommended as a standard technique for this purpose.
authors.affiliation: Department of Radiation Physics, Sahlgren's Hospital, Gothenburg, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Vikhoff
authors.forename: S
authors.initials: S
authors.lastname: Ribbelin
authors.forename: B
authors.initials: B
authors.lastname: Köhler
authors.forename: S
authors.initials: S
authors.lastname: Ekholm
authors.forename: H
authors.initials: H
authors.lastname: Borrman
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D016477:Artifacts; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D016722:Cermet Cements / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003793:Dental Restoration, Permanent; D005782:Gels; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008961:Models, Structural; D009532:Nickel / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012685:Sepharose / Q000737:chemistry; D014520:Urethane / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D016722:Cermet Cements; C029012:Composite Dental Resin; D003188:Composite Resins; D003722:Dental Alloys; D005782:Gels; D011140:Polyurethanes; C056413:Occlusin; C065771:P50 composite resin; C033470:Dispersalloy; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate; C035197:nickel nitrate; D009532:Nickel; D003723:Dental Amalgam; C039734:Durafill; C059919:Estilux posterior; D012685:Sepharose; C046503:formula F 70