title: Wear of composite resin veneering materials and enamel in a chewing simulator.
abstract: OBJECTIVE
  The purpose of this in vitro study was to evaluate the wear of six composite resins for the veneering of crowns compared with the wear of human and bovine enamel, tested in a dual-axis chewing simulator.
  
  
  METHODS
  Eight specimens of six different composite resins (Targis I+II, Solidex, BelleglassHP, Estenia, Solidex) and of human and bovine enamel were prepared. Steatite ceramic balls served as antagonistic specimens. Specimens were dynamically loaded in a dual-axis chewing simulator with 49 N up to 1,200,000 loading cycles with additional thermal cycling between 5 and 55 degrees C. After 120,000, 240,000, 480,000, 840,000 and 1,200,000 loading cycles, an impression of the specimens' surface and the antagonistic specimen was taken using a polyvinylsiloxane impression material. The substance loss at the surface was measured with computer-aided laser profilometry. Data were analyzed using ANOVA and the Tukey test.
  
  
  RESULTS
  The wear of the ultra fine compact filled composite resins Solidex and BelleglassHP was not statistically significantly different from that of human enamel. The other composite resins and bovine enamel showed a wear statistically significantly higher than human enamel.
  
  
  CONCLUSIONS
  Comparing six composite resins for the veneering of crowns, ultra fine compact filled composite resins BelleGlassHP and Solidex showed a wear not significantly different from the wear of human and bovine enamel.
authors.affiliation: Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts-University at Kiel, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Mehl
authors.forename: Soeren
authors.initials: S
authors.lastname: Scheibner
authors.forename: Klaus
authors.initials: K
authors.lastname: Ludwig
authors.forename: Matthias
authors.initials: M
authors.lastname: Kern
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D003743:Dental Enamel; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006801:Humans; D008409:Mastication; D008422:Materials Testing; D019217:Tooth Attrition
chemical_list: D003188:Composite Resins