Materials design in the performance of all-ceramic crowns

Brian R. Lawn, Antonia Pajares, Yu Zhang, Yan Deng, Mariano A. Polack, Isabel K. Lloyd, E. Dianne Rekow, Van P. Thompson

Research output: Contribution to journalArticle

Abstract

Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer substrates, in bilayer (ceramic/polymer) and trilayer (ceramic/ceramic/polymer) configurations. The specimens are loaded at their top surfaces with spherical indenters, in simulation of occlusal function. The onset of fracture is observed in situ using a video camera system mounted beneath the transparent polymer substrate. Critical loads to induce fracture and deformation at the ceramic top and bottom surfaces are measured as functions of layer thickness and contact duration. Radial cracking at the ceramic undersurface occurs at relatively low loads, especially in thinner layers. Fracture mechanics relations are used to confirm the experimental data trends, and to provide explicit dependencies of critical loads in terms of key variables: material - elastic modulus, hardness, strength and toughness; geometric - layer thicknesses and contact radius. Tougher, harder and (especially) stronger materials show superior damage resistance. Critical loads depend strongly (quadratically) on crown net thickness. The analytic relations provide a sound basis for the materials design of next-generation dental crowns.

Original languageEnglish (US)
Pages (from-to)2885-2892
Number of pages8
JournalBiomaterials
Volume25
Issue number14
DOIs
StatePublished - Jun 2004

Fingerprint

Ceramics
Crowns
Polymers
Tooth Crown
Video cameras
Substrates
Fracture mechanics
Toughness
Loads (forces)
Elastic Modulus
Elastic moduli
Hardness
Acoustic waves
Dentin
Mechanics
Tooth

Keywords

  • Crowns
  • Dental ceramics
  • Materials design
  • Plasticity
  • Radial cracks

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering

Cite this

Lawn, B. R., Pajares, A., Zhang, Y., Deng, Y., Polack, M. A., Lloyd, I. K., ... Thompson, V. P. (2004). Materials design in the performance of all-ceramic crowns. Biomaterials, 25(14), 2885-2892. https://doi.org/10.1016/j.biomaterials.2003.09.050

Materials design in the performance of all-ceramic crowns. / Lawn, Brian R.; Pajares, Antonia; Zhang, Yu; Deng, Yan; Polack, Mariano A.; Lloyd, Isabel K.; Rekow, E. Dianne; Thompson, Van P.

In: Biomaterials, Vol. 25, No. 14, 06.2004, p. 2885-2892.

Research output: Contribution to journalArticle

Lawn, BR, Pajares, A, Zhang, Y, Deng, Y, Polack, MA, Lloyd, IK, Rekow, ED & Thompson, VP 2004, 'Materials design in the performance of all-ceramic crowns', Biomaterials, vol. 25, no. 14, pp. 2885-2892. https://doi.org/10.1016/j.biomaterials.2003.09.050
Lawn BR, Pajares A, Zhang Y, Deng Y, Polack MA, Lloyd IK et al. Materials design in the performance of all-ceramic crowns. Biomaterials. 2004 Jun;25(14):2885-2892. https://doi.org/10.1016/j.biomaterials.2003.09.050
Lawn, Brian R. ; Pajares, Antonia ; Zhang, Yu ; Deng, Yan ; Polack, Mariano A. ; Lloyd, Isabel K. ; Rekow, E. Dianne ; Thompson, Van P. / Materials design in the performance of all-ceramic crowns. In: Biomaterials. 2004 ; Vol. 25, No. 14. pp. 2885-2892.
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