J Dent Rehabil Appl Sci.  2016 Mar;32(1):60-69. 10.14368/jdras.2016.32.1.60.

Comparison of digital models generated from three-dimensional optical scanner and cone beam computed tomography

• Kwon HJ
• Kim KK
• Yi WJ

• KMID: 2162380
• DOI: http://doi.org/10.14368/jdras.2016.32.1.60

Abstract

PURPOSE
The objective of this study was to compare the accuracy of digital models from 3 dimentional (3D) optical scanner and cone beam computed tomography (CBCT).
MATERIALS AND METHODS
We obtained digital models from 11 pairs of stone casts using a 3D optical scanner and a CBCT, and compared the accuracy of the models.
RESULTS
The error range of average positive distance was 0.059 - 0.117 mm and negative distance was 0.066 - 0.146 mm. Statistically (P < 0.05), average positive distance was larger than 70 µm and shorter than 100 µm, and that of negative distance was larger than 100 µm and shorter than 120 µm.
CONCLUSION
We concluded that the accuracy of digital models generated from CBCT is not appropriate to make final prostheses. However, it may be acceptable for provisional restorations and orthodontic diagnoses with respect to the accuracy of the digitalization.

Keyword

dental casting technique; dental digital radiography; dental models; cone beam computed tomography

MeSH Terms

Cone-Beam Computed Tomography*
Dental Casting Technique
Dental Models
Diagnosis
Prostheses and Implants
Radiography, Dental, Digital

Figure

• 

  Fig. 1 Construction procedure of digital model from CBCT image. (A) Down view of intermediate model with threshold 600 - 1,000, (B) Rear view of intermediate model with threshold 600 - 1,000, (C) Side view of intermediate model with threshold 600 - 1,000, (D) Constructed digital model.

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  Fig. 2 Deviation analysis procedure. (A) Trimming of CBCT digital model, (B) Alignment of digital models from CBCT and 3D oral scanner by ICP algorithm, (C) Aligned result, (D) Result of deviation analysis.

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  Fig. 3 Deviation analysis (A) Frontal view of result shows least average PE (maxillary cast of model no. 01), (B) Occlusal view of result shows least average PE (maxillary cast of model no. 01), (C) Frontal view of result shows least average NE (maxillary cast of model no. 03), (D) Occlusal view of result shows least average NE (maxillary cast of model no. 03).

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  Fig. 4 Deviation analysis which shows PE at pit, fissure, proximal area and NE at cusp (maxillary cast of model no. 10).

Reference

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