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Fracture resistance of endodontically treated roots after restoration
Author(s) -
Fraga R. C.,
Chaves B. T.,
Mello G. S. B.,
Jr J. F. Siqueira
Publication year - 1998
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.1998.00327.x
Subject(s) - materials science , dentistry , crown (dentistry) , fracture (geology) , stereo microscope , dentin , post and core , composite number , composite material , medicine
This study evaluated the shear strength resistance of endodontically treated roots that were restored by two different techniques. Twenty‐seven recently extracted single‐rooted teeth with similar anatomic characteristics were sectioned to obtain the same length for all specimens. Group I (GI) consisted of 14 roots restored with cast post‐core (nickel–chromium alloy) and cemented using zinc phosphate cement; group II (GII) consisted of 13 roots restored with steel prefabricated posts (FKG ® ) cemented with zinc phosphate cement and rotated with caution for anchorage. The crown portion of this group was made using a hybrid composite resin (Prisma APH ® ). Results showed that on all specimens of GI the fracture occurred in the cervical root structure while in GII the composite resin fractured in all specimens. Statistical analysis showed a significantly higher resistance to fracture for GI than GII. The specimens were sectioned longitudinally for stereoscopic microscope analysis (63×) and did not show fracture lines in the dentin anchorage post area for any of the specimens.