title: The influence of dental alloys on three-body wear of human enamel and dentin in an inlay-like situation.
abstract: This in vitro study evaluated the effect of metal alloys on three-body wear resistance of enamel and dentin, and vice versa. Three-body wear of human enamel, dentin, a soft gold alloy (BiOcclus Inlay), a CoCr alloy (Remanium 2000), a resin cement (Variolink II) and a zinc oxide phosphate cement (Harvard) was investigated using the ACTA-machine. Sample chambers of eight sample wheels were prepared with pure materials or combinations of human tooth substance, alloys and cement, simulating an inlay-like situation. After 100,000 and 200,000 cycles in a millet suspension with a spring force of 20 N, the amount of abraded material was profilometrically measured and evaluated by 3D surface data analysis. After 200,000 cycles, the materials demonstrated a mean loss of 0.41 microm for CoCr, 51 microm for gold, 57 microm for enamel, 164 microm for dentin, 79 microm for Variolink and 369 microm for Harvard. Using ANOVA and the Games-Howell-test, resin cement, enamel and gold were a subset not shown to differ, as was zinc phosphate cement and dentin. CoCr demonstrated the least wear and differed significantly from all materials. Enamel wear was significantly reduced in mixed chambers with CoCr, and gold after 200,000 cycles compared to enamel in pure chambers. In summary, a soft gold alloy can be recommended for inlays when considering three-body abrasion since the wear rate of the "soft" gold alloy corresponded to that of human enamel.
authors.affiliation: Department of Prosthodontics, Ludwig-Maximilian-University of Munich, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Graf
authors.forename: G H
authors.initials: GH
authors.lastname: Johnson
authors.forename: A
authors.initials: A
authors.lastname: Mehl
authors.forename: P
authors.initials: P
authors.lastname: Rammelsberg
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D002858:Chromium Alloys / Q000737:chemistry; D003188:Composite Resins; D003722:Dental Alloys / Q000737:chemistry*; D003743:Dental Enamel / Q000473:pathology*; D019554:Dental Restoration Wear; D003804:Dentin / Q000473:pathology*; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007284:Inlays; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D014072:Tooth Abrasion / Q000473:pathology*; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D002858:Chromium Alloys; D003188:Composite Resins; D003722:Dental Alloys; D006047:Gold Alloys; D019279:Resin Cements; C103502:Variolink; D015036:Zinc Phosphate Cement; C074226:Harvard Cement