Posterior Partial Coverage Restorations: how fracture resistant and what is the risk of failure?

This summary is based on the article published in the Journal of Esthetic and Restorative Dentistry: Evaluation of fracture resistance and failure risks of posterior partial coverage restorations (April 2013)

Context

The interest in posterior partial coverage restorations has increased because these restorations provide a more conservative treatment option than traditional cohesively based restorations; however, material selection has been a controversial topic in the current literature.

Purpose of the Study

To evaluate the fracture resistance of posterior partial coverage restorations restored with different materials, examine their stress distribution, and calculate failure risks using three-dimensional (3D) finite element analysis.

Key Messages

Fracture resistance and failure risks of posterior partial coverage restorations are significantly influenced by material selection.

Clinical Significance

• Many restorative materials have been advocated for partial coverage restorations. It is essential to ensure that restorative materials have sufficient strength to support occlusal forces and, in case of fracture, the remaining tooth structure is not compromised or placed at risk.
• The study revealed that all-ceramic materials had high incidences of fractures involving the materials themselves, whereas the predominant failure of resin-based composite involved the tooth structure in a catastrophic manner.

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