title: An in vitro investigation of the wear of enamel on porcelain and gold in saliva.
abstract: This study compared enamel wear against low-fusing porcelain (Procera All-Ceramic) with the wear against feldspathic porcelain (Ceramco) and gold alloy (Olympia). Human enamel abraders were polished to a 3 microns variance on silicon carbide paper. Five enamel abraders were abraded against five disks that were fabricated from (1) gold alloy polished to 1 micron variance, (2) autoglazed feldspathic porcelain, and (3) autoglazed low-fusing porcelain. The enamel sample was tested in human saliva in a wear machine with a constant load of 1 pound during 10,000 rotational cycles. The amount of wear was determined with a stereomicroscope at magnification x64. Significant differences in mean enamel wear were found when abraded against Olympia gold (9 microns), Procera All-Ceramic (60 microns), and Ceramco feldspathic porcelain (230 microns). Significant differences in restorative material wear were found between Olympia gold (0.32 microns) and the porcelain materials, Procera All-Ceramic (4.3 microns) and Ceramco feldspathic porcelain (3.7 microns).
authors.affiliation: Department of Prosthodontics, University of Michigan, Ann Arbor, USA.
authors.forename: C H
authors.initials: CH
authors.lastname: Hacker
authors.forename: W C
authors.initials: WC
authors.lastname: Wagner
authors.forename: M E
authors.initials: ME
authors.lastname: Razzoog
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D017554:Carbon Compounds, Inorganic; D003743:Dental Enamel / Q000648:ultrastructure*; D003776:Dental Porcelain / Q000737:chemistry*; D006047:Gold Alloys / Q000737:chemistry*; D006801:Humans; D017680:Potassium Compounds / Q000737:chemistry; D012399:Rotation; D012463:Saliva; D017655:Silicon Compounds / Q000737:chemistry; D013499:Surface Properties; D014072:Tooth Abrasion / Q000473:pathology
chemical_list: D000538:Aluminum Silicates; D017554:Carbon Compounds, Inorganic; D006047:Gold Alloys; D017680:Potassium Compounds; D017655:Silicon Compounds; D003776:Dental Porcelain; C016447:feldspar; D002244:Carbon; C022088:silicon carbide