Hi Guest!

D6793 - provisional retainer crown - further treatment or completion of diagnosis necessary prior to final impression
D6253 - provisional pontic - further treatment or completion of diagnosis necessary prior to final impression

As for CPT codes for services listed above, there are not direct crosscodes we are aware of, so if the medical insurers cannot accept the "D" code on the medical claim (many insurers these days will process "D" codes when they are medically necessary services), you can use the CPT code below and include a narrative report describing the procedure:
41899 - Unlisted procedure, dentoalveolar structures


Hope this helps!