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

The functional rehabilitation of teeth with endodontic involvement and substantial loss of coronal structure can be a challenging scenario. The use of fiber-reinforced posts (FRPs) promotes retention and supports the restoration. The main cause of failure associated with the use of FRPs is the debonding of the post, mainly due to polymerization contraction or incorporation of voids in the thick resin cement layer during the cementation protocol. This case report describes a simple 2-step cementation technique to reduce polymerization shrinkage of the resin cement and improve the fit of the FRP inside the root canal. In the first cementation step, the FRP is wrapped in a polyvinyl chloride film and placed in the canal, self-curing glass ionomer cement is injected in the canal, and the cement is allowed to cure. In the second cementation step, the FRP is removed from the canal, unwrapped, and tried in the canal again. If it fits correctly, it is removed from the canal, and a self-etching resin cement is mixed and injected into the canal. The post is reinserted, excess resin cement is removed, and the cement is polymerized. This technique reduces the volume of resin cement required in each step and consequently the polymerization contraction stress. The 2-step technique is a simple method and a useful option for flared root canals.