Ferrule design and fracture resistance of endodontically treated teeth.
This study evaluated the fracture resistance of pulpless teeth with various ferrule designs and amounts of coronal tooth structure. One millimeter of coronal tooth structure above the crown margin substantially increased the fracture resistance of endodontically treated teeth, whereas a contrabevel at either the tooth-core junction or the crown margin was ineffective. The thickness of axial tooth structure at the crown margin did not appreciably improve resistance to fracture.
Sorensen
J A
JA
University of California, School of Dentistry, Los Angeles.
Engelman
M J
MJ
D000704:Analysis of Variance; D003442:Crowns; D003799:Dental Stress Analysis; D003779:Denture Design; D005069:Evaluation Studies as Topic; D006801:Humans; D007180:Incisor; D008437:Maxilla; D011176:Post and Core Technique / Q000295:instrumentation*; D011475:Prosthesis Failure; D012390:Root Canal Therapy; D014082:Tooth Fractures / Q000517:prevention & control*