The following individual presented to my practice my an edentulous maxilla and partially edentulous mandible. An interim maxillary complete denture was fabricated, which served as the radiographic and surgical guide: once it was duplicated. Implants were placed in sites #6,8,10,30. Patient declined to undergo grafting procedures so implants in the pre-maxilla region were the best option available. The mandible was restored using two FDP's from #19-21 and #22-27 with a single unit implant is site #30. The vision for the final restoration is a bar retained over denture.
This techniques is a quick aid when setting denture teeth for the final restoration. Assuming you like the position of the teeth in the trial denture, make a silicone matrix of that position indexed to the mandibular cast and voila! You have created a great opportunity to visualize the concept of restorative space relative to the new implant master cast with the jig holding the teeth!
https://youtu.be/GC26vx-_V-U
Ahuja.S, Cagna. D "Classification and Management of Restorative Space in Edentulous Implant Overdenture Patients" JPD May 2011 Vol 105 Issue 5