A combined conventional-digital workflow for predictable cross-arch guide plane reduction

A combined conventional and digital workflow is described to print a 3-dimensional complete-arch reduction guide. This was used to prepare guide planes with cross-arch parallelism in the distal of both maxillary first molars, the mesial of both maxillary first premolars, and the distolingual of both maxillary central incisors for a patient requiring a removable partial denture to replace missing bilateral maxillary lateral incisors and canines. The 3-dimensionally printed guide was placed on the remaining teeth in the arch and used as both a visual guide and a guide for tooth preparation.