en
Scientific article
English

ADM guidance—Ceramics: Fracture toughness testing and method selection

Published inDental Materials Journal, vol. 33, no. 6, p. 575-584
Publication date2017
Abstract

Objectives. The objective is within the scope of the Academy of Dental Materials GuidanceProject, which is to provide dental materials researchers with a critical analysis of fracturetoughness (FT) tests such that the assessment of the FT of dental ceramics is conducted ina reliable, repeatable and reproducible way. Methods. Fracture mechanics theory and FT methodologies were critically reviewed to intro-duce basic fracture principles and determine the main advantages and disadvantages ofexisting FT methods from the standpoint of the dental researcher. Results. The recommended methods for FT determination of dental ceramics were the SingleEdge “V” Notch Beam (SEVNB), Single Edge Precracked Beam (SEPB), Chevron Notch Beam(CNB), and Surface Crack in Flexure (SCF). SEVNB's main advantage is the ease of producingthe notch via a cutting disk, SEPB allows for production of an atomically sharp crack gener-ated by a specific precracking device, CNB is technically difficult, but based on solid fracturemechanics solutions, and SCF involves fracture from a clinically sized precrack. The IF testshould be avoided due to heavy criticism that has arisen in the engineering field regardingthe empirical nature of the calculations used for FT determination.Significance. Dental researchers interested in FT measurement of dental ceramics shouldstart with a broad review of fracture mechanics theory to understand the underlying principles involved in fast fracture of ceramics. The choice of FT methodology should be based on the pros and cons of each test, as described in this literature review.

Keywords
  • Dental ceramics
  • Fracture toughness
  • Mechanical properties
  • Fractography
Citation (ISO format)
CESAR, Paulo Francisco et al. ADM guidance—Ceramics: Fracture toughness testing and method selection. In: Dental Materials Journal, 2017, vol. 33, n° 6, p. 575–584. doi: 10.1016/j.dental.2017.03.006
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ISSN of the journal0287-4547
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