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Accuracy between intraoral and extraoral scanning: Three-dimensional deviation and effect of distance between
Ana Larisse Carneiro Pereira1, Henrique Vieira Melo Segundo1, Luiz Carlos Alves Júnior1
1Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Natal, Rio Grande do Norte, Brazil.
Aim:
Evaluate the accuracy between the intraoral and extraoral scanning regarding the three dimensional (3D) deviation and distances between the implants, through 2 scanning methods.
Settings And Design:
An in vitro study.
Materials And Methods:
An edentulous mandibular model was used to install four implants and abutments, recommending 6 distances between the implants. Scans were performed using an intraoral (SI) and extraoral (SE) scanner for each studied group: Scanning with the scan bodies (SB) and device (SD) (n = 10). The files were imported into a surface evaluation program to assess 3D deviations and measure distances between implants.
Statistical Analysis:
Precision was assessed as the difference between files (Kruskal-Wallis test), while trueness was assessed from the difference between scans, applying the Wilcoxon and Mann-Whitney test.
Results:
As for the 3D deviations, SI showed accuracy, for the faces and positions of the implants in relation to the SE, in both scanning methods (P < 0.05). Regarding the capture of distances between implants, the SD scan obtained better trueness than the SB group (P < 0.05).
Conclusion:
We concluded that the type and scanning methods used did not influence the 3D deviations, while for distances, scanning with the device had better trueness.
