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Reverse Scan Body: A Complete Digital Workflow for Prosthesis Prototype Fabrication

Now online in the Journal of Prosthodontics, an original research article co-authored by ACP member, Armand Bedrossian DDS, MS, and ACP Fellow, Konstantinos Chochlidakis DDS, MSF, FACP.

This study assessed the accuracy of fit of prosthesis prototypes fabricated via a complete digital workflow protocol with a reverse scan body. This workflow skips intraoral scanning for implant data acquisition. The extraoral scanning captures prosthesis contours, intaglio surface, and 3D implant position all at the same time, eliminating the need for intraoral scanning of scan bodies for data acquisition.

For this in vitro study, a maxillary stone cast with four multiunit abutment implant analogs served as the master cast and an interim screw-retained prosthesis was fabricated on it. Novel reverse scan bodies were connected to the interim prosthesis, and extraoral scanning was performed with a white light intraoral scanner. A total of 50 milled and 50 printed fixed complete denture prototypes were produced.

Out of the 50 digitally fabricated milled prosthesis prototypes, 50 (100%) presented with accurate fit under in vitro assessment; while 44 (88%) of the 50 digitally fabricated 3D printed prototypes presented with accurate fit under in vitro assessment. The authors conclude that a complete digital workflow protocol with extraoral scanning and a reverse scan body may lead to accurately fitting digitally fabricated prosthesis prototypes with the milling technique.

Papaspyridakos, P, Bedrossian, A, Kudara, Y, Ntovas, P, Bokhary, A, Chochlidakis, K. Reverse scan body: A complete digital workflow for prosthesis prototype fabrication. J Prosthodont. 2023; 1– 6. https://doi.org/10.1111/jopr.13664

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