We are using cookies to implement functions like login, shopping cart or language selection for this website. Furthermore we use Google Analytics to create anonymized statistical reports of the usage which creates Cookies too. You will find more information in our privacy policy.
OK, I agree I do not want Google Analytics-Cookies
Quintessence International



Forgotten password?


Quintessence Int 30 (1999), No. 1     1. Jan. 1999
Quintessence Int 30 (1999), No. 1  (01.01.1999)

Page 61-67

Effects of cyclic loading on selected post-and-core systems
Reagan / Fruits / van Brunt / Ward
Objective: The purpose of this study was to evaluate the resistance of selected post-and-core systems to fatigue testing. Method and materials: A fatigue-testing machine and data acquisition software were developed for this in vitro test. Pulpless mandibular second premolars were treated with three different types of post-and-core system: (1) two different prefabricated posts with amalgam cores, (2) the same two pre-fabricated posts with resin composite cores, and (3) cast post and cores, which served as the control group. The fatigue-testing machine applied alternating buccal and lingual forces to the core until lateral movement of 0.0025 inches (63.5 um) was detected by a transducer contacting the surface of the core. This criterion represented initial cement failure. Results: Although groups using the resin composite core material exhibited a higher number of cycles prior to failure, there was no statistically significant difference between the different post-and-core systems. Conclusion: All of the post-and-core systems that were tested may be acceptable for restoring endodontically treated teeth.