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Accuracy of virtual models in the assessment of maxillary defects.

Kamburoğlu K, Kurşun Ş, Kılıç C, Özen T - Imaging Sci Dent (2015)

Bottom Line: Virtual models obtained using VRMesh Design were compared with impressions obtained by scanning silicon models.Gold standard volumes of the impression models were then compared with CBCT and 3D scanner measurements.Further, the 3D scanner measurements were closer to the gold standard measurements when compared to the CBCT measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.

ABSTRACT

Purpose: This study aimed to assess the reliability of measurements performed on three-dimensional (3D) virtual models of maxillary defects obtained using cone-beam computed tomography (CBCT) and 3D optical scanning.

Materials and methods: Mechanical cavities simulating maxillary defects were prepared on the hard palate of nine cadavers. Images were obtained using a CBCT unit at three different fields-of-views (FOVs) and voxel sizes: 1) 60×60 mm FOV, 0.125 mm(3) (FOV60); 2) 80×80 mm FOV, 0.160 mm(3) (FOV80); and 3) 100×100 mm FOV, 0.250 mm(3) (FOV100). Superimposition of the images was performed using software called VRMesh Design. Automated volume measurements were conducted, and differences between surfaces were demonstrated. Silicon impressions obtained from the defects were also scanned with a 3D optical scanner. Virtual models obtained using VRMesh Design were compared with impressions obtained by scanning silicon models. Gold standard volumes of the impression models were then compared with CBCT and 3D scanner measurements. Further, the general linear model was used, and the significance was set to p=0.05.

Results: A comparison of the results obtained by the observers and methods revealed the p values to be smaller than 0.05, suggesting that the measurement variations were caused by both methods and observers along with the different cadaver specimens used. Further, the 3D scanner measurements were closer to the gold standard measurements when compared to the CBCT measurements.

Conclusion: In the assessment of artificially created maxillary defects, the 3D scanner measurements were more accurate than the CBCT measurements.

No MeSH data available.


Related in: MedlinePlus

Multi-vari chart for measurement by method/observer
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Related In: Results  -  Collection

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Figure 7: Multi-vari chart for measurement by method/observer

Mentions: For both observers, 3D scanner measurements were closer to the gold standard measurements compared to the CBCT measurements. The multi-vari chart for measurement by method/observer is shown in Figure 7.


Accuracy of virtual models in the assessment of maxillary defects.

Kamburoğlu K, Kurşun Ş, Kılıç C, Özen T - Imaging Sci Dent (2015)

Multi-vari chart for measurement by method/observer
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4362988&req=5

Figure 7: Multi-vari chart for measurement by method/observer
Mentions: For both observers, 3D scanner measurements were closer to the gold standard measurements compared to the CBCT measurements. The multi-vari chart for measurement by method/observer is shown in Figure 7.

Bottom Line: Virtual models obtained using VRMesh Design were compared with impressions obtained by scanning silicon models.Gold standard volumes of the impression models were then compared with CBCT and 3D scanner measurements.Further, the 3D scanner measurements were closer to the gold standard measurements when compared to the CBCT measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.

ABSTRACT

Purpose: This study aimed to assess the reliability of measurements performed on three-dimensional (3D) virtual models of maxillary defects obtained using cone-beam computed tomography (CBCT) and 3D optical scanning.

Materials and methods: Mechanical cavities simulating maxillary defects were prepared on the hard palate of nine cadavers. Images were obtained using a CBCT unit at three different fields-of-views (FOVs) and voxel sizes: 1) 60×60 mm FOV, 0.125 mm(3) (FOV60); 2) 80×80 mm FOV, 0.160 mm(3) (FOV80); and 3) 100×100 mm FOV, 0.250 mm(3) (FOV100). Superimposition of the images was performed using software called VRMesh Design. Automated volume measurements were conducted, and differences between surfaces were demonstrated. Silicon impressions obtained from the defects were also scanned with a 3D optical scanner. Virtual models obtained using VRMesh Design were compared with impressions obtained by scanning silicon models. Gold standard volumes of the impression models were then compared with CBCT and 3D scanner measurements. Further, the general linear model was used, and the significance was set to p=0.05.

Results: A comparison of the results obtained by the observers and methods revealed the p values to be smaller than 0.05, suggesting that the measurement variations were caused by both methods and observers along with the different cadaver specimens used. Further, the 3D scanner measurements were closer to the gold standard measurements when compared to the CBCT measurements.

Conclusion: In the assessment of artificially created maxillary defects, the 3D scanner measurements were more accurate than the CBCT measurements.

No MeSH data available.


Related in: MedlinePlus