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How oral environment simulation affects ceramic failure behavior.

Ediléia Lodi1, Kátia R Weber1, Paula Benetti2

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Fatigue significantly impacts the fracture load and failure modes of leucite-reinforced glass-ceramics, crucial for dental restoration development. This study evaluated ceramic behavior under simulated oral conditions to improve material toughness.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Mechanical Engineering

Background:

  • Investigating ceramic mechanical behavior in simulated clinical scenarios aids in developing tougher dental restorative materials.
  • The optimal in vitro testing environment for dental ceramics remains unclear.

Purpose of the Study:

  • To investigate the failure behavior of leucite-reinforced glass-ceramic under compression and fatigue in simulated oral environments.
  • To assess the impact of fatigue loading on ceramic fracture properties.

Main Methods:

  • Fifty-three CAD-CAM ceramic specimens were tested under monotonic compression and fatigue in 37°C water.
  • Acoustic emission detected initial cracks; Weibull distribution analyzed compressive load data.
  • A cumulative damage model with an inverse power law fitted fatigue data for 1x10^6 and 2x10^6 cycles.

Main Results:

  • Monotonic testing yielded a characteristic failure load of 1615 N and a Weibull modulus of 5.
  • Fatigue testing showed increasing probability of failure with higher loads and cycles.
  • The primary failure mode was radial cracking, with combined modes observed under fatigue.

Conclusions:

  • Fatigue loading significantly alters the fracture load and failure modes of leucite-reinforced glass-ceramic.
  • Findings contribute to understanding ceramic behavior in simulated oral conditions for improved dental restorations.