Fracture toughness, vibration modal analysis and viscoelastic behavior of Kevlar, glass, and carbon fiber/epoxy composites for dental-post applications.

The use of flexible dental posts concentrates the stress at the dentin and the use of stiff posts increases the stress at the interface. Efforts were directed toward introducing inhomogeneous materials for resolving the disadvantages of both flexible and stiff posts. The main objective of this study was to develop three different fiber/epoxy composite posts.