Evaluation of the fracture resistance of a wrought post compared with completely cast post and cores.
The intraradicular fracture of a post and core presents a difficult and often unrestorable situation. Attempts to prevent this problem involved the use of materials with increased physical properties. The use of a preformed wrought post with a core cast to it may provide a more fracture-resistant foundation. This investigation compared a commercially available noble alloy-wrought post that had a gold core cast to it with completely cast specimens from three different alloys. A standard pattern was designed to simulate a post and core that would be used in a tooth of limited length and canal space. Patterns were cast and fixed to custom holding devices. Each specimen was subjected to a shearing force until catastrophic failure in a universal testing machine. Significant differences were noted among the groups.
Ryther
J S
JS
Department of Prosthodontics, University of Iowa, College of Dentistry, Iowa City.
Leary
J M
JM
Aquilino
S A
SA
Diaz-Arnold
A M
AM
D000704:Analysis of Variance; D003722:Dental Alloys; D003735:Dental Casting Technique; D006047:Gold Alloys; D008422:Materials Testing; D010165:Palladium; D011176:Post and Core Technique / Q000295:instrumentation*; D011475:Prosthesis Failure; D012834:Silver
D003722:Dental Alloys; D006047:Gold Alloys; D012834:Silver; D010165:Palladium