Fatigue resistance of restored endodontically treated teeth: a multiparametric analysis.
OBJECTIVE
To evaluate the failure patterns of teeth restored with both cast metal and fiber posts after fatigue cycling.


METHODS
Thirty-five crownless human teeth subdivided into 5 groups were subjected to 2 x 106 100-N fatigue cycles at 8 Hz under 37 degrees C water.


RESULTS
No root fatigue fractures were recorded. High microleakage values were found in specimens that survived fatigue. No statistically significant relationships were found for fatigue (P > .4), fracture strength (P > .8), and microleakage (P > .1).


CONCLUSIONS
Cast-metal and fiber posts undergo insidious microscopic adhesive failures at similar levels. Increasing the post diameter and/or post stiffness could improve the core stabilization.
Department of Prosthodontics, Alma Mater Studiorum, University of Bologna, Italy. PB.dos@med.unibo.it
Paolo
P
Baldissara
Valerio
V
Di Grazia
Anna
A
Palano
Leonardo
L
Ciocca
D001696:Biomechanical Phenomena; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D011176:Post and Core Technique; D012390:Root Canal Therapy; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014092:Tooth Root / Q000503:physiopathology; D019553:Tooth, Nonvital / Q000503:physiopathology*; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D003722:Dental Alloys; D003738:Dental Cements; D003764:Dental Materials; C009753:fiberglass; D014867:Water