title: Mechanical properties and DIC analyses of CAD/CAM materials.
abstract: BACKGROUND
  This study compared two well-known computer-aided-design/computer-aided-manufactured (CAD/CAM) blocks (Paradigm MZ100 [3M ESPE] and Vitablocs Mark II [Vita] in terms of fracture toughness (Kic), index of brittleness (BI) and stress/strain distributions.
  
  
  METHODS
  Three-point bending test was used to calculate the fracture toughness, and the relationship between the Kic and the Vickers hardness was used to calculate the index of brittleness. Additionally, digital image correlation (DIC) was used to analyze the stress/strain distribution on both materials.
  
  
  RESULTS
  The values for fracture toughness obtained under three-point bending were 1.87Pa√m (±0.69) for Paradigm MZ100 and 1.18Pa√m (±0.17) for Vitablocs Mark II. For the index of brittleness, the values for Paradigm and Vitablocs were 73.13μm-1/2 (±30.72) and 550.22μm-1/2 (±82.46). One-way ANOVA was performed to find differences (α=0.05) and detected deviation between the stress/strain distributions on both materials.
  
  
  CONCLUSIONS
  Both CAD/CAM materials tested presented similar fracture toughness, but, different strain/stress distributions. Both materials may perform similarly when used in CAD/CAM restorations.Key words:Ceramic, CAD/CAM, hybrid materials, composite resin, fracture toughness.
authors.affiliation: DDS, MSc, PhD, Department of Restorative Dentistry, Faculty of Dentistry, Sao Paulo State University, Araraquara, SP-Brazil; DDS, MSc, PhD, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH - USA.
authors.forename: Thiago
authors.initials: T
authors.lastname: Porto
authors.affiliation: DDS, MSc, PhD, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH - USA.
authors.forename: Renato
authors.initials: R
authors.lastname: Roperto
authors.affiliation: PhD, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH-USA.
authors.forename: Anna
authors.initials: A
authors.lastname: Akkus
authors.affiliation: PhD, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH-USA.
authors.forename: Ozan
authors.initials: O
authors.lastname: Akkus
authors.affiliation: DDS, MSc, PhD, Department of Restorative Dentistry, Faculty of Dentistry, Sao Paulo State University, Araraquara, SP-Brazil.
authors.forename: Sizenando
authors.initials: S
authors.lastname: Porto-Neto
authors.affiliation: DDS, MBA, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH-USA.
authors.forename: Sorin
authors.initials: S
authors.lastname: Teich
authors.affiliation: DDS, MBA, Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, OH-USA.
authors.forename: Lisa
authors.initials: L
authors.lastname: Lang
authors.affiliation: DDS, MSc, PhD, Department of Restorative Dentistry, Faculty of Dentistry, Sao Paulo State University, Araraquara, SP-Brazil.
authors.forename: Edson
authors.initials: E
authors.lastname: Campos