Korean J Orthod.  2011 Aug;41(4):224-236. 10.4041/kjod.2011.41.4.224.

Three dimensional structural analysis between dental arch and basal bone in normal occlusion

• Kim JT
• Lee JW

• KMID: 2274258
• DOI: http://doi.org/10.4041/kjod.2011.41.4.224

Abstract

OBJECTIVE
The purpose of this study was to analyze the dental and basal arch forms in patients with normal occlusion using the computed tomography (CT) imaging method.
METHODS
CT images were taken from 27 normal occlusion subjects (male, 15; female, 12) and these images were reconstructed into three-dimensional models. A 3D-coordinate system was formed by setting the middle of the facial axis (FA) point of the maxillary central incisors as the origin. The morphology of the maxilla and mandibular dental and basal arches were analyzed by sectioning parallel to the maxillary occlusal plane.
RESULTS
There was no significant difference between A point and B point and between the maxillary 1st molars in both sides of the maxillary and mandibular basal bone. The dental arch was located more labially than the basal arch in the anterior portion. The bucco-lingual crossover of the dental arch and basal arch was formed at the molar region in the maxilla, and at the premolar region in the mandible.
CONCLUSIONS
This study will help provide three-dimensional diagnostic information about the relationship between basal and dental arches in patients who have severe dental compensation and inappropriate jaw relationships.

Keyword

Dental arch; Basal arch; CT

MeSH Terms

Axis, Cervical Vertebra
Bicuspid
Compensation and Redress
Dental Arch
Female
Humans
Incisor
Jaw
Maxilla
Molar

Figure

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  Fig. 1 Three-dimensional coordinate system. A, Maxillary occlusal plane (XY plane) is the plane passing the FA point of #16, 26 and the center of #11, 21 FA point; B, midpalatal plane (YZ plane) is the plane passing ANS and PNS perpendicular to the maxillary occlusal plane; C, frontal plane (ZX plane) is the plane passing the center of #11, 21 FA point perpendicular to the maxillary occlusal plane and midpalatal plane.

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  Fig. 2 Basal bone. A, A plane passing through A point parallel to XY plane; B, a plane passing through B point parallel to XY plane; C, five planes passing through the FA points of #16, #13, center of #11 and 21, #23, and #26 parallel to YZ plane; D, segmentation of 3D object; E, a plane passing through the FA points of #17, #27 perpendicular to XY plane; F, point on the basal bone arch (#17, #16, #13, A point, #23, #26, #27 area).

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  Fig. 3 Crown center. A, Crown center of the incisor shown as the midpoint of the incisal edge; B, crown center of the canine shown as the cusp tip of the canine; C, and D, crown center of premolar and molar, respectively, shown as the midpoint of the crown at the proximal contact point level.

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  Fig. 4 Root center. A, B, C, The root apex for single-rooted teeth; D, the midpoint of the apical third of the root in three cross-sectional images for multiple-rooted teeth.

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  Fig. 5 Upper and lower basal bone form.

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  Fig. 6 Basal arch form and dental arch form.

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  Fig. 7 Upper basal arch, crown center and root center.

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  Fig. 8 Lower basal arch, crown center and root center.

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