Korean J Orthod.  2009 Feb;39(1):6-17. 10.4041/kjod.2009.39.1.6.

Comparison of model analysis measurements among plaster model, laser scan digital model, and cone beam CT image

• Lim MY
• Lim SH

• KMID: 1469134
• DOI: http://doi.org/10.4041/kjod.2009.39.1.6

Abstract

OBJECTIVE
The purpose of this study was to evaluate the possibility of using a digital model and cone beam computed tomograph (CBCT) image for model analysis.
METHODS
Model analyses of CBCT images, plaster models, and digital models of 20 orthodontic patients with a permanent dentition with no proximal metal restorations, were compared.
RESULTS
The average differences of tooth size measurements were 0.01 to 0.20 mm, and the average difference of arch length discrepancy measurements were 0.41 mm in the maxilla and 0.82 mm in the mandible. The difference in Bolton discrepancy measurements was 0.17 mm for the anterior region and 0.44 mm overall but with no statistically significant difference. When comparing CBCT images with plaster models, the average differences in tooth size measurements were -0.22 to 0.01 mm, and the average differences in arch length discrepancy measurements were 0.43 mm in the maxilla and 0.32 mm in the mandible. Difference in Bolton discrepancy measurements were 0.35 mm in the anterior region and 1.25 mm overall. CBCT images showed significantly smaller overall Bolton discrepancy measurements.
CONCLUSIONS
Although there were statistically significant differences in some model analysis measurements, the ranges of measurement errors of the digital model and CBCT images were clinically acceptable. Therefore, a digital model and CBCT image can be used for model analysis.

Keyword

Digital model; Cone beam CT; Model analysis; Plaster model

MeSH Terms

Cone-Beam Computed Tomography
Dentition, Permanent
Humans
Mandible
Maxilla
Tooth

Figure

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  Fig 1 Measurements of tooth size and dental arch width of a laser scan digital model. 3DXer ver 3.5 was used.

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  Fig 2 Volume rendering model of CBCT data constructed using Accurex ver 1.0. 3D zoom mode was applied and displayed in the main window for measurement of lower left lateral incisor width. The thresholding ranges of teeth 3 preset that were used in this study are shown in the fine tuning tab on the bottom of the program window.

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