Accuracy of 3D digital modeling of dental arches
Dental Press Journal of Orthodontics
Print version ISSN 2176-9451On-line version ISSN 2177-6709
Objective:
The aim of the study was to verify and compare the accuracy of
full-arch digital impressions obtained using two intraoral scanners and
three scanning methodologies.
Methods:
A resin model created with dental 3-D printing was scanned by a
reference scanner (Zfx Evolution - Zimmer Biomet, Palm Beach Gardens,
FL) in order to obtain a 3D reference; the same resin model was then
scanned with two different intraoral scanners (Zfx IntraScan and
Carestream 3600 - CS 3600®, Carestream, Rochester, NY, USA)
using: Technique A (from tooth #27 up to tooth #17); Technique B (from
tooth #11 up to tooth #17 and then from tooth #21 up to tooth #27) and
Technique C (from tooth #22 up to tooth #17, and then from tooth #12 up
to tooth #27 - the MeshLab software v. 1.3.3 was then used to match the
two scans). The scans obtained were superimposed over the reference scan
by means of a software, and the volumetric discrepancies were
calculated.
Results:
The mean results for the Zfx Intrascan scanner were: Technique A =
302.47 ± 37.42 µm; Technique B = 180.45 ± 29.86 µm; Technique C = 147.34
± 28.23 µm. The mean results for the Carestream 3600 scanner were:
Technique A = 303.59 ± 40.20 µm; Technique B = 181.53 ± 29.61 µm;
Technique C = 142.28 ± 35.33 µm. Technique C, used by both scanners,
produced less volumetric discrepancies compared to the other techniques.
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