Inverse correlations between wear and mechanical properties in biphasic dental materials with ceramic constituents

Oscar Borrero-Lopez, Fernando Guiberteau, Yu Zhang, Brian R. Lawn

Research output: Contribution to journalArticle

Abstract

The objective of this study is to elucidate the interdependence of competing mechanical degradation processes in biphasic dental materials with ceramic constituents in the region of high-pressure occlusal loading. It is hypothesized that wear resistance in this region correlates inversely with basic material parameters (modulus, hardness, toughness, strength) evaluated from 'standardized' test specimens. Ball-on-flat wear tests in simulation of oral function are used to quantify susceptibility to protracted sliding contact damage. Wear rates for this class of dental material tend to increase with quasistatic parameter values, so the latter do not provide a reliable guide to longevity. The generation of severe-wear facets involves cumulative quasiplastic deformation and microcrack coalescence at the grain level. It is implied that interplay between wear and fracture mechanisms should be an important consideration in future microstructural design of dental ceramics, especially in the quest to balance durability against esthetics.

Original languageEnglish (US)
Article number103722
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume105
DOIs
StatePublished - May 2020

Keywords

  • Biphasic dental ceramics
  • Fracture
  • Mechanical properties
  • Microstructure
  • Wear

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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