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The Fracture Toughness of Various Core Materials
Author(s) -
Ziebert Anthony J.,
Dhuru Virendra B.
Publication year - 1995
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.1995.tb00312.x
Subject(s) - materials science , fracture toughness , amalgam (chemistry) , composite material , glass ionomer cement , core (optical fiber) , universal testing machine , composite number , fracture (geology) , toughness , ultimate tensile strength , chemistry , electrode
Purpose This study determined the fracture toughness of four core buildup materials. Materials and Methods Single‐edge notch, bar‐shaped specimens conforming to the American Society for Testing Materials standard E‐399 were fabricated for a high copper amalgam alloy, two composite resins, and a glass ionomer buildup material. The specimens were stored in air for 1 week and then tested in three‐point bending mode with an Instron Universal Testing Machine (Instron Corporation, Canton, MA). Results Fracture toughness values obtained were as follows: Fluorocore (composite resin; Caulk, Milford, DE), 1.54 MN · m −1.5 ; Ti‐Core (composite resin and titanium; Essential Dental Systems, New York, NY), 1.34 MN · m −1.5 ; Valiant Ph.D. (amalgam; Caulk), 1.29 MN · m −1.5 ; and Coreshade Glass lonomer Base Cement (Shofu Inc, Kyota, Japan), 0.55 MN · m −1.5 . Conclusions Glass ionomer materials are probably unsuitable as core buildup materials because of their relatively low fracture toughness. Fluorocore, Ti‐Core, and amalgam all had fracture toughness values significantly greater than the glass ionomer ( P < .01).