Merging intraoral scans and CBCT: a novel technique for improving the accuracy of 3D digital models for implant-supported complete-arch fixed dental prostheses

Abstract

Aim: A technique for merging digital intraoral and CBCT scans for implant-supported complete-arch fixed dental prostheses (FDPs) is described. The aim is to improve the dimensional accuracy of intraoral scans in edentulous arches.

Materials and method: Two files are recorded: an intraoral scan and a CBCT scan, both obtained with scan bodies connected to the implants in the same position. The intraoral scan is then divided into several fragments and realigned, taking as reference the position of the implants recorded in the CBCT file.

Results: An improved intraoral digital model with corrected implant positions appropriate for complete-arch implant FDPs is generated.

Conclusion: The methodology proposed can minimize possible intraoral scanning error and deliver more reliable digital impressions for implant-supported complete-arch FDPs.

Keywords: CBCT; complete-arch rehabilitation; dental implants; intraoral scanners (IOSs); passive fit; fixed dental prosthesis (FDP).