title: Wear resistance of nanofilled composite resin and feldspathic ceramic artificial teeth.
abstract: BACKGROUND
  The wear resistance of nanofilled composite resin and feldspathic ceramic artificial teeth may vary according to the material type and physical characteristics of the antagonist.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the wear resistance of nanofilled composite resin and feldspathic ceramic artificial teeth after simulated mastication against steatite, zirconia, and alumina antagonists.
  
  
  METHODS
  The study evaluated 6 groups of artificial teeth: 3 groups of 8 nanofilled composite resin teeth (Condyloform II NFC) and 3 groups of 8 feldspathic ceramic teeth (Bonartic CT). Three sets of 16 steatite, 16 zirconia, and 16 alumina cusp-shaped antagonist surfaces were fabricated and used to test wear resistance. Each group was loaded for 600,000 cycles. The wear resistance was analyzed by measuring vertical and volume substance lost (microm and mm(3), respectively), determined with a laser scanner. Data were statistically analyzed using 2-way ANOVA and Games-Howell test (alpha=.05).
  
  
  RESULTS
  The influence of the materials tested and antagonists was statistically significant. The composite resin teeth showed significantly higher vertical and volume substance loss than ceramic teeth opposing steatite cusps (P<.001; P=.04, respectively), while composite resin teeth opposing alumina and zirconia cusps demonstrated less wear than ceramic teeth. However, the latter differences were not statistically significant.
  
  
  CONCLUSIONS
  The wear behavior of nanofilled composite resin and feldspathic ceramic teeth varies according to the type of antagonistic material. However, alumina and zirconia ceramics caused less wear in antagonists than steatite ceramic.
authors.affiliation: Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany.
authors.forename: Muhamad
authors.initials: M
authors.lastname: Ghazal
authors.forename: Zakereyya S
authors.initials: ZS
authors.lastname: Albashaireh
authors.forename: Matthias
authors.initials: M
authors.lastname: Kern
mesh_terms: D000537:Aluminum Oxide; D000538:Aluminum Silicates; D003188:Composite Resins; D003198:Computer Simulation; D003776:Dental Porcelain; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis; D006244:Hardness; D006801:Humans; D008277:Magnesium Oxide; D008409:Mastication; D008422:Materials Testing; D053761:Nanocomposites; D017680:Potassium Compounds; D012822:Silicon Dioxide; D013499:Surface Properties; D014093:Tooth, Artificial; D015040:Zirconium
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; D008277:Magnesium Oxide; C089766:steatite; D012822:Silicon Dioxide; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide