repair a PFM bridge with PFM or zirconia overlay crown

Question 1

limitations

Answer 1

1) must be able to prepare enough for a PFM margin and adequate space for occlusion
2) inadequate space - remake FDP
???

Question 2

reduction

Answer 2

1) prep the FDP
2) create temporary
3) have lab make a new restoration (overlay crown)

so that the bridges can stay in place