title: In vitro evaluation of the wear resistance of composite resin blocks for CAD/CAM.
abstract: The aim of the study was to investigate two- and three-body wear of CAD/CAM blocks. Four composite resins, one hybrid ceramic and one feldspar ceramic block material were examined. Six specimens each were tested in a ball-on-disc wear device fitted with a zirconia ball (50 N load, 1.2 Hz, 50 k cycles) in water for two-body and in poppy seed slurry for three-body wear evaluation. Volume loss after each 10 k cycle was quantified using a digital CCD microscope.
  
  
  METHODS
  ANOVA and Tukey's multiple comparisons (α=0.05). Two-body wear for composite resin blocks was small, hybrid ceramic and ceramic blocks showed larger volume loss. Threebody wear was very low for all materials. All CAD/CAM block materials investigated displayed low wear compared to previous data for direct posterior composites carrying out the same wear test. The block materials are considered suitable for fabrication of single full crown restorations on premolar teeth.
authors.affiliation: Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
authors.forename: Sasipin
authors.initials: S
authors.lastname: Lauvahutanon
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Meiko
authors.initials: M
authors.lastname: Oki
authors.forename: Mansuang
authors.initials: M
authors.lastname: Arksornnukit
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kanehira
authors.forename: Werner J
authors.initials: WJ
authors.lastname: Finger
mesh_terms: D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D017076:Computer-Aided Design; D003764:Dental Materials / Q000737:chemistry; D019554:Dental Restoration Wear; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003764:Dental Materials