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Panther, Scott Thomas

University of British Columbia

Objectives: 3D imaging provides accurate records for treatment planning, diagnosis, and monitoring treatment over time. Being able to take 3D images while patients have orthodontic brackets in place is critical for these records to be clinically applicable. The aim of this study was to compare the accuracy of merging Bellus Arc7 facial scans with Trios intraoral scans with and without orthodontic brackets (Part I), and to assess soft tissue changes of the lips before and after bonding brackets (Part II). Materials and Methods: 25 participants receiving orthodontic braces had two sets of images taken before and after bracket placement. Each set included 5 images (Bellus Arc7 facial scan, two Artec Space Spider facial scans, and two scans with the Trios intraoral scanner). For Part I, a 3D virtual patient was created with and without orthodontic brackets using the Bellus Arc7 facial scan and Trios dentition scan. Using the root mean square (RMS) and dental point deviations, alignment was compared to a reference virtual patient generated from the Artec Space Spider facial scan and Trios dentition scan. For Part II, the Artec Space Spider facial scans before and after bonding were superimposed. Point deviations of 20 perioral soft tissue landmarks were analyzed in the x-, y-, and z-axes. Results: For Part I, the RMS of the superimposed Bellus Arc7 scan compared to the Artec Space Spider scan was 1.60 mm ± 0.49 mm without orthodontic brackets and 1.54 mm ± 0.49 mm with brackets. This difference was not statistically significant. For Part II, most soft tissue landmarks had no statistically significant difference in position in any of the three planes of space, except for pronasale, subnasale, right cheilion, lower lip point, and soft tissue pogonion. All soft tissue changes were below clinical significance and there was a wide range of individual variation between participants. Conclusions: Orthodontic brackets do not affect the accuracy of merging Bellus Arc7 facial scans with Trios intraoral scans. Bonding orthodontic brackets does not cause significant soft tissue change for the majority perioral landmarks, but a wide range of individual variation occurs.

Text

2024-01-30

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/87393

Craniofacial Science

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/