Korean J Orthod.  2011 Aug;41(4):255-267. 10.4041/kjod.2011.41.4.255.

Evaluation of mesiodistal tooth axis using a CBCT-generated panoramic view

• Song IT
• Cho JH
• Chae JM
• Chang NY

• KMID: 2274260
• DOI: http://doi.org/10.4041/kjod.2011.41.4.255

Abstract

OBJECTIVE
The purpose of this study was to confirm the reliability of a cone beam computed tomography (CBCT)-generated panoramic view based on a CBCT 3D image and to find the most helpful 2D panoramic image compared with CBCT 3D image when examining the mesiodistal tooth axis.
METHODS
A test model was constructed according to cephalometric norms. The test model was repeatedly repositioned for CBCT and panoramic radiographic imaging. Panoramic radiographs were acquired at each of the following 3 occlusal plane positions: -5degrees, 0degrees, and +5degrees. Measurements of mesiodistal tooth axis in CBCT 3D image, CBCT-generated panoramic view, and panoramic radiographs were compared.
RESULTS
Compared with the CBCT-generated panoramic view, CBCT 3D image showed significant difference in the mesiodistal tooth axis in the premolars and no significant difference in the mesiodistal tooth axis in the incisors and canines. Mesiodistal tooth axis on the CBCT-generated panoramic view was significantly different from that on panoramic radiographs.
CONCLUSIONS
CBCT-generated panoramic view can be a useful tool for evaluating mesiodistal tooth axis.

Keyword

Cone beam computed tomography (CBCT); CBCT-generated panoramic view; Mesiodistal tooth axis

MeSH Terms

Axis, Cervical Vertebra
Bicuspid
Cone-Beam Computed Tomography
Dental Occlusion
Incisor
Tooth

Figure

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  Fig. 1 Test model design.

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  Fig. 2 Generation of panoramic view from CBCT data. CBCT, Cone beam computed tomography.

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  Fig. 3 Angular measurement of tooth axis to reference line. A, CBCT 3D image; B, CBCT-generated panoramic view; C, panoramic radiograph. CBCT, Cone beam computed tomography.

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  Fig. 4 Mean differences of tooth axis between CBCT 3D image and each panoramic image (CBCT-generated panoramic view and panoramic radiographs). CBCT, Cone beam computed tomography. Tooth number follows FDI system.

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  Fig. 5 Mean angular differences of the mesiodistal tooth axis between CBCT-generated panoramic view image and panoramic radiograph images. CBCT, Cone beam computed tomography.

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