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Fracture toughness of various core build‐up materials
Author(s) -
Bonilla E. D.,
Mardirossian G.,
Caputo A. A.
Publication year - 2000
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2000.00014.x
Subject(s) - materials science , composite material , fracture toughness , crosshead , composite number , amalgam (chemistry) , glass ionomer cement , universal testing machine , toughness , flexural strength , ultimate tensile strength , chemistry , electrode
Purpose The purpose of this investigation was to compare the fracture toughness of several core materials. Materials and Methods Five core build‐up materials were tested: (1) glass ionomer, (2) resin‐modified glass ionomer, (3) titanium‐reinforced composite, (4) composite resin with fluoride, and (5) amalgam. Fracture toughness determinations were made using 3‐point flexure of beams with a central single‐edge notch. The notch was standardized by the use of a special mold into which each of the materials was condensed. Ten beams of each material were tested on an Instron test machine (Instron Corp, Canton, MA) at a crosshead speed of 1.25 mm/min. The maximum loads were determined from which the fracture toughness values (K IC ) were calculated. The data were analyzed statistically using analysis of variance and t tests. Results The mean fracture toughness value in MN·m −3/2 for each of them is as follows: (1) glass ionomer, 0.717 ± 0.071; (2) resin‐modified glass ionomer, 0.747 ± 0.061; (3) titanium‐reinforced composite, 1.409 ± 0.051; (4) composite resin with fluoride, 1.660 ± 0.086; and (5) amalgam, 1.521 ± 0.081. There was no significant difference in the K IC values for the glass ionomer‐based materials, and both of these were significantly lower than amalgam, titanium‐reinforced composite resin, and composite resin with fluoride ( p < .001 ). Conclusions The titanium‐reinforced composite resin, the composite resin with fluoride, and amalgam materials showed fracture toughness most likely to withstand the stresses generated during mastication.