A. Many thanks for your enquiry, the best option for a tooth which has been root canaled and little tooth tissue remain is to crown the tooth, whether that be with a CEREC or conventional crown. nowadays if CEREC is being used on a back tooth the material of choice is E max which is a stronger block than the tradition CEREC material. the lifespan on both teeth should be the same however material choice on the root canal treated tooth is more important as the tooth is more prone to fracture due to the lack of innervation and also forces being applied on the tooth. any crown should last around ten years.

hope this is helpful.