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Fracture toughness measurements of some dental core ceramics: a methodologic study
Author(s) -
KVAM KETIL,
HERÖ HÅKON,
ÖILO GUDBRAND
Publication year - 1991
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1991.tb01065.x
Subject(s) - ceramic , fracture toughness , dental ceramics , indentation , materials science , composite material , fracture (geology) , composite number , ranking (information retrieval) , computer science , cubic zirconia , machine learning
— Fracture toughness is regarded as an important property of dental ceramics. The most widely used methods for fracture toughness (K Ic ) determination are based on assessment of cracks created by hardness indentations. Different formulas have been developed for K Ic calculations and all these methods and formulas include empirical factors based on pure ceramics, i.e. non‐composite ceramics. These factors may, however, vary for a specified method for materials with different and complex structure. An important question is whether the various proposed methods and formulas lead to approximately the same numerical K Ic values or at least to the same ranking of materials. The aim of this work was to compare two indentation methods and various formulas for calculation of K Ic values when used on four commercial composite dental ceramics. The two applied methods and the different formulas showed substantial differences in the obtained values for one and the same material and a different ranking of various materials. It is unknown which method gives the most correct K Ic values for these ceramic materials.