An alternative 2-step cementation technique to reduce polymerization shrinkage stress in root canals: a case report

Area of Science:

• Restorative Dentistry
• Dental Materials Science

Background:

• Restoring endodontically treated teeth with significant coronal structure loss presents challenges.
• Fiber-reinforced posts (FRPs) are used for retention and support, but debonding is a common failure mode.
• Debonding often results from polymerization shrinkage or voids in thick resin cement layers.

Observation:

• A novel 2-step cementation technique for FRPs is presented.
• The technique involves a preliminary cementation with self-curing glass ionomer cement and a final cementation with self-etching resin cement.
• A polyvinyl chloride film is used to facilitate post removal after the initial cementation step.

Findings:

• This technique reduces the volume of resin cement used in each step, thereby minimizing polymerization contraction stress.
• Improved fit of the FRP within the root canal is achieved.
• The method is particularly suitable for flared root canals.

Implications:

• The 2-step technique offers a simple and effective approach to reduce FRP debonding.
• This method can enhance the longevity and success rate of restorations involving FRPs.
• It provides a valuable alternative for managing challenging endodontic cases, especially those with flared canals.