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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Original Article

Korean J Orthod 2009; 39(1): 6-17

Published online January 30, 2009 https://doi.org/10.4041/kjod.2009.39.1.6

Copyright © The Korean Association of Orthodontists.

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

Mi-young Lim, DDS, MSD, a and Sung-hoon Lim, DDS, MSD, PhDb

aPostgraduate student, Department of Orthodontics, School of Dentistry, Chosun University, Korea.
bAssociate Professor, Department of Orthodontics, School of Dentistry, Chosun University, Korea.

Correspondence to: Sung-hoon Lim. Department of Orthodontics, School of Dentistry, Chosun University, 421, Seoseok-dong, Dong-gu, Gwangju 501-717, Korea. +82 62 220 3870; Email: shlim@chosun.ac.kr

Received: August 19, 2008; Revised: December 19, 2008; Accepted: December 22, 2008

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.

Keywords: Digital model, Cone beam CT, Model analysis, Plaster model

Article

Original Article

Korean J Orthod 2009; 39(1): 6-17

Published online January 30, 2009 https://doi.org/10.4041/kjod.2009.39.1.6

Copyright © The Korean Association of Orthodontists.

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

Mi-young Lim, DDS, MSD, a and Sung-hoon Lim, DDS, MSD, PhDb

aPostgraduate student, Department of Orthodontics, School of Dentistry, Chosun University, Korea.
bAssociate Professor, Department of Orthodontics, School of Dentistry, Chosun University, Korea.

Correspondence to: Sung-hoon Lim. Department of Orthodontics, School of Dentistry, Chosun University, 421, Seoseok-dong, Dong-gu, Gwangju 501-717, Korea. +82 62 220 3870; Email: shlim@chosun.ac.kr

Received: August 19, 2008; Revised: December 19, 2008; Accepted: December 22, 2008

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.

Keywords: Digital model, Cone beam CT, Model analysis, Plaster model