TITLE:
Evaluation of the Accuracy of Digital Models Obtained Using Intraoral and Extraoral Scanners versus Gold Standard Plaster Model (Diagnostic Accuracy Study)
AUTHORS:
Mohammed Amr Labib, Amr Ragab El-Beialy, Khaled Hazem Attia
KEYWORDS:
Study Models, Digital Models, Orthodontics, Intra-Oral Scanners, Impression Scanner
JOURNAL NAME:
Open Journal of Medical Imaging,
Vol.10 No.3,
September
29,
2020
ABSTRACT: Introduction: Digital models showed promising results for orthodontic diagnosis and
treatment planning. Digital models can be obtained from alginate impressions as
well as direct intra-oral scanners. Studies assessing the accuracy of digital
models have shown digital models to be valid, clinically acceptable, and more
quickly obtainable. With the advent of new scanners with better scanning
technology researches are necessary to evaluate their accuracy and reliability. Aim of Study: To evaluate the diagnostic accuracy of 3D digital models
obtained through intraoral and extraoral scanning modalities to the reference
gold standard plaster model. Material & Methods: Twenty-four adult
male and female subjects were randomly selected for this study. The intraoral
scanners evaluated in this study were Sirona (CEREC Omnicam) and 3 shape (TRIOS
3), while the laboratory scanners used were Sirona (inEos X5), and 3 shape
(D850). Intra-oral scanning of the subjects and extra-oral scanning of their
alginate impressions, plaster models of the alginate impression, rubber base
impression, and plaster model of their rubber base impression were done. Linear dental
measurements included intermolar width, interpremolar width, intercanine width,
mesiodistal width of the 1st permanent molar, 1st premolar, canine and central incisor and arch width. All data were collected,
tabulated and subjected to statistical analysis. Results: Small
differences between the plaster and digital models were observed.
Intra-observer reliability analysis for 14 out of the 16 measurements showed
that all variables exhibited good to excellent reliability. Conclusions: There
was no difference between the digitization using the intraoral scanner or the
laboratory scanner. The most accurate digitization technique was the 3 Shape laboratory scanner
of the cast of the alginate impression. The inEos X5 showed the highest error
of digitization of the alginate and rubber base impressions.