title: Nanofilled and microhybrid composite restorations: Five-year clinical wear performances.
abstract: OBJECTIVE
  To compare the clinical wear performance of nanofilled restorations (Filtek Supreme) against microhybrid restorations (Z100) in a 5-year randomized clinical trial to evaluate the wear rate and the influence of subject-, operator- and restoration-related variables on wear rate.
  
  
  METHODS
  18 Filtek Supreme and 17 Z100 restorations were placed in human molars (split-mouth-model) and bonded with Single Bond/Scotch Bond Adhesive. Restorations were recalled at baseline, 6-, 12-months and at annual intervals until 5-years of clinical service. The gypsum replicas at each recall were used for 3D-Pro-laser scanning to quantify wear and the epoxy resin replicas were observed under SEM for microwear patterns. Linear-mixed-models were used to study the influence of the different variables on the vertical and volume loss.
  
  
  RESULTS
  Volume wear, but not the vertical wear rate of the two restorative materials were significantly influenced (p<0.05) by the factors such as operator, cavity type, as well as combination of operator-cavity type and quadrant type. The variations in the occlusal surface microwear patterns over time reflect the effect of biomechanics of mastication on the restorative composite.
  
  
  CONCLUSIONS
  The rate of vertical and volume loss of both the restoratives appear, on average, not to be constant even after the early stage wear, under the influence of certain clinical variables.
authors.affiliation: Leuven BIOMAT Research Cluster, Catholic University of Leuven, Leuven, Belgium. selvi.palaniappan@uz.kuleuven.ac.be
authors.forename: Senthamaraiselvi
authors.initials: S
authors.lastname: Palaniappan
authors.forename: Dimple
authors.initials: D
authors.lastname: Bharadwaj
authors.forename: Daniela Lima
authors.initials: DL
authors.lastname: Mattar
authors.forename: Marleen
authors.initials: M
authors.lastname: Peumans
authors.forename: Bart
authors.initials: B
authors.lastname: Van Meerbeek
authors.forename: Paul
authors.initials: P
authors.lastname: Lambrechts
mesh_terms: D000328:Adult; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods; D003737:Dental Cavity Preparation; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008855:Microscopy, Electron, Scanning; D003765:Models, Dental; D008963:Molar; D053761:Nanocomposites; D010316:Particle Size; D019279:Resin Cements; D012822:Silicon Dioxide; D013382:Subtraction Technique; D055815:Young Adult; D015040:Zirconium
chemical_list: D003188:Composite Resins; C474035:Filtek Supreme; D019279:Resin Cements; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium