Chairside virtual patient protocol. Part 3: In vitro accuracy of a digital facebow

Carlo Raffone; Francesco Gianfreda; Donato Antonacci; Mario Giulio Pompeo; Patrizio Bollero; Luigi Canullo

doi:10.1016/j.jdent.2023.104622

Chairside virtual patient protocol. Part 3: In vitro accuracy of a digital facebow

J Dent. 2023 Oct:137:104622. doi: 10.1016/j.jdent.2023.104622. Epub 2023 Jul 13.

Authors

Carlo Raffone¹, Francesco Gianfreda², Donato Antonacci³, Mario Giulio Pompeo⁴, Patrizio Bollero⁵, Luigi Canullo⁶

Affiliations

¹ Private Practice, Rome 00198, Italy. Electronic address: raffonecarlo@hotmail.it.
² Department of Industrial Engineering, University of Rome "Tor Vergata", Rome 00133, Italy.
³ Private Practice, Via Leonida Laforgia 4, Bari 70126, Italy.
⁴ Private Practice, Rome 00198, Italy.
⁵ Department of System Medicine, University of Rome "Tor Vergata", Rome 00133, Italy.
⁶ Department of Surgical Sciences, University of Genova, Genoa, Italy.

PMID: 37453655
DOI: 10.1016/j.jdent.2023.104622

Abstract

Objectives: The present study aimed to investigate the trueness and precision of an intraoral transfer element (IOTE) designed for matching intraoral and facial scans.

Methods: A mannequin head with a maxillary model in position was used. Cone beam computed tomography (CBCT) was used to construct the master model (MM). A digital impression of the maxillary arch was taken using an intraoral scanner, and the IOTE was used to record the maxillary arch position. Twenty facial scans with and twenty without the IOTE in place were performed with a handheld device (Ipad Pro, Apple) using a dedicated software. Digital mounting was performed to build a scan model (SM). Using software for data processing, the three-dimensional deviation between the MM and SM at the central left incisor (#9#), and the left and right first molars (#3#, #14#) was calculated as trueness and linear deviation precision. . Angular deviation was also calculated at the occlusal plane.

Results: The linear deviation trueness at #9#, #3# and #14# was 0.3 ± 0.12 mm, 1.07 ± 0.28 mm, and 0.18 ± 0.34 mm, respectively, whereas the precision was 1.17 ± 0.4 mm, 0.43 ± 0.12 mm, and 0.64 ± 0.28 mm, respectively. Trueness of the angular deviation at the occlusal plane was 2.17 ± 0.46°, whereas the angular deviation precision was 0.64 ± 0.28°.

Conclusions: Based on in vitro findings the proposed IOTE design is accurate and suitable for clinical use.

Clinical significance: Direct virtual mounting is a reliable technique in vitro; however, in vivo tests are required.

Keywords: Digital facebow; Digital matching; Digital references; Facescan; Full digital workflow; Intraoral transfer element; Virtual patient.

MeSH terms

Computer-Aided Design
Dental Impression Technique*
Humans
Imaging, Three-Dimensional*
Maxilla / diagnostic imaging
Models, Dental