Evaluation of post and cores in the laboratory: rationale for developing a fatigue test and preliminary results.
Prosthetic treatment failures related to the biomechanical deficiencies of post and cores still represent a problem of clinical significance. To overcome the difficulties of clinical studies, numerous in vitro methods were developed to address specific properties of post-and-core restorations. Most of them, however, were based on an oversimplified mechanical testing of the restored tooth. Experience proved that the fatigue of restorative materials was a primordial factor in clinical failures. Therefore, special devices were built that stimulate the physiological masticatory cycle. Tests performed with adhesive post-and-core systems seem to indicate that materials placed in the tooth should have physical properties as close as possible to those of natural tissues. New carbon-epoxy posts appear to offer a promising solution for restoring the endodontically treated tooth.
Dietschi
D
D
Division of Dental Restorations, School of Dental Medicine, University of Geneva, Switzerland.
Romelli
M
M
Goretti
A
A
D001696:Biomechanical Phenomena; D001732:Bite Force; D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000592:standards*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003804:Dentin / Q000648:ultrastructure; D004853:Epoxy Resins / Q000737:chemistry; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D006801:Humans; D007754:Laboratories, Dental; D008409:Mastication / Q000502:physiology; D008422:Materials Testing / Q000295:instrumentation / Q000592:standards; D011176:Post and Core Technique / Q000592:standards*; D012390:Root Canal Therapy; D013314:Stress, Mechanical; D013499:Surface Properties; D016474:Weight-Bearing
D000077482:Carbon Fiber; D003738:Dental Cements; D003764:Dental Materials; D004853:Epoxy Resins; D002244:Carbon