Composite Resin Core Buildups With and Without Post for the Restoration of Endodontically Treated Molars Without Ferrule

Authors: P Magne J Goldberg D Edelhoff J-F Guth

Just catching up on Pascal Magne's newest research. Highly recommend this article,

Composite Resin Core Buildups With…

Posted by Biomimetic Dentistry CE on Saturday, February 13, 2016

Major Findings

    High strength ceramics were omitted to avoid masking the effect of the core buildup. Instead leucite-reinforced ceramic was used (empress cad). The cad restorations allowed for very consistent restoration thickness and geometry to allow best possible standardization. No ferrule prepearation was used, again to prevent masking the true performance of the build-up and/or post. The teeth were loaded at 30 degrees concentrated on the working cusp. This is a worst-case scenario and was selected because no specimens failed during pilot testing when the load was applied axially with tripod contact pattern.

  1. The performance of an all ceramic crown is influenced by the elastic modulus of the core buildup. A higher elastic modulus core-buildup increases the fracture-resistance of all-ceramic crowns.
  2. insertion of a fiber-reinforced post does not enhance the load-bearing capacity and survival of all-ceramic leucite-reinforced ceramic.
  3. In 20% of post specimens, failure was preceeded by an early initial failure where a wide gap opened immediately opposite to the post.
  4. The most favorable combination of strength and failure mode could be observed in the multicore HB group. This dual cure core-build up material is 86% filled by wt.
  5. No differences in fatigue survival were found among the three types of crowns. This is with a stepped protocol totaling 185k cycles from 200N,400N, 600N, 800N, 1000N, 1200N, and finally 1400N