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Fatigue resistance of restored endodontically treated teeth: a multiparametric analysis
Paolo Baldissara1, Valerio Di Grazia, Anna Palano
1Department of Prosthodontics, Alma Mater Studiorum, University of Bologna, Italy. PB.dos@med.unibo.it
Purpose:
To evaluate the failure patterns of teeth restored with both cast metal and fiber posts after fatigue cycling.
Materials And 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.