Flexural resistance of Cerec CAD/CAM system ceramic blocks: Part 2: Outsourcing materials

Maurizio Sedda, Alessandro Vichi, Francesco Del Siena, Chris Louca, Marco Ferrari

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To test different Cerec CAD/CAM system ceramic blocks, comparing mean flexural strength (sigma), Weibull modulus (m), and Weibull characteristic strength (sigma0) in an ISO standardized set-up.

Methods: Following the recent ISO Standard (ISO 6872:2008), 11 types of ceramic blocks were tested: IPS e.max CAD MO, IPS e.max CAD LT and IPS e.max CAD HT (lithium disilicate glass-ceramic); In-Ceram SPINELL, In-Ceram Alumina and In-Ceram Zirconia (glass-infiltrated materials); inCoris AL and In-Ceram AL (densely sintered alumina); In-Ceram YZ, IPS e.max Zir-CAD and inCoris ZI (densely sintered zirconia). Specimens were cut out from ceramic blocks, finished, crystallized/infiltrated/sintered, polished, and tested in a three-point bending test apparatus. Flexural strength, Weibull characteristic strength, and Weibull modulus were obtained.

Results: A statistically significant difference was found (P < 0.001) among lithium disilicate glass-ceramic (sigma = 272.6 +/- 376.8 MPa, m = 6.2 +/- 11.3, sigma0 = 294.0 +/- 394.1 MPa) and densely sintered alumina (sigma = 441.8 +/- 541.6 MPa, m = 11.9 +/- 19.0, sigma0 = 454.2 +/- 565.2 MPa). No statistically significant difference was found (P = 0.254) in glass infiltrated materials (sigma = 376.9 +/- 405.5 MPa, m = 7.5 +/- 11.5, sigma0 = 393.7 +/- 427.0 MPa). No statistically significant difference was found (P = 0.160) in densely sintered zirconia (sigma = 1,060.8 +/- 1,227.8 MPa, m = 5.8 +/- 7.4, sigma0 = 1,002.4 +/- 1,171.0 MPa). Not all the materials tested fulfilled the requirements for the clinical indications recommended by the manufacturer.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalAmerican Journal of Dentistry
Volume27
Issue number1
Publication statusPublished - Feb 2014
Externally publishedYes

Keywords

  • Aluminum Oxide
  • Ceramics
  • Computer-Aided Design
  • Dental Porcelain
  • Elastic Modulus
  • Humans
  • Magnesium Oxide
  • Materials Testing
  • Pliability
  • Stress, Mechanical
  • Surface Properties
  • Yttrium
  • Zirconium
  • Comparative Study

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