Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Characterization of Damage Modes in Dental Ceramic Bilayer Structures



Y N. Deng, Brian R. Lawn, Isabel K. Lloyd


Results of contact tests using spherical indenters on flat ceramic coating layers bonded to compliant substrates are reported for selected dental ceramics. Critical loads to produce various damage modes, cone cracking and quasiplasticity at the top surfaces and radial cracking at the lower (inner) surfaces, are measured as a function of ceramic layer thickness. It is proposed that these damage modes, especially radial cracking, are directly relevant to the failure of all-ceramic dental crowns. The critical load data are analyzed using explicit fracture mechanics relations, expressible in terms of routinely measurable material parameters (elastic modulus, strength, toughness, hardness) and essential geometrical variables (layer thickness, contact radius). The utility of such analyses in the design of ceramic/substrate bilayer systems for optimal resistance to lifetime-threatening damage is discussed.
Journal of Biomedical Materials Research
No. 2


dental ceramics, elastic modulus, fracture, hardness, layer structures, material design, strength, toughness


Deng, Y. , Lawn, B. and Lloyd, I. (2002), Characterization of Damage Modes in Dental Ceramic Bilayer Structures, Journal of Biomedical Materials Research (Accessed April 23, 2024)
Created December 31, 2001, Updated October 12, 2021