Korean J Orthod.  2008 Oct;38(5):358-370. 10.4041/kjod.2008.38.5.358.

Study of horizontal skeletal pattern and dental arch in skeletal Class III malocclusion patients

• Park HC
• Lee JW

• KMID: 2273922
• DOI: http://doi.org/10.4041/kjod.2008.38.5.358

Abstract

OBJECTIVE
The purpose of this study was to investigate the horizontal skeletal pattern and dental arch differences between Class III malocclusion patients and normal occlusion patients.
METHODS
Twenty skeletal Class III malocclusion patients and ten normal occlusion patients were selected and 3D facial CT were taken to analyze the horizontal skeletal differences between the two groups.
RESULTS
In the horizontal comparison of the maxilla, skeletal width and perimeter were significantly smaller in skeletal Class III patients on ANS and A point reference planes. The difference between maxillary width of ANS and A point reference planes showed that there was greater constriction of the first and second premolar in skeletal Class III patients. In the horizontal comparison of the mandible, the widths of the canine and premolar area were significantly larger in skeletal Class III patients on B point reference plane. The differences between width of the upper and lower jaws (comparison of A and B reference planes) were significantly large in the canine and premolar area.
CONCLUSIONS
From this study, the characteristics of Class III malocclusion patients were shown through horizontal constriction of the maxilla. But to make clear further detailed characteristics of Class III malocclusion patients, additional studies are necessary.

Keyword

3-D imaging; Prognathism

MeSH Terms

Bicuspid
Constriction
Dental Arch
Humans
Imaging, Three-Dimensional
Jaw
Malocclusion
Mandible
Maxilla
Prognathism

Figure

• 

  Fig 1. Reference plane. 1, Maxillary midsagittal plane (Na-ANS-Ba); 2, ANS horizontal plane (A plane passing ANS perpedicular to Maxillary midsagittal plane); 3, A point horizontal plane (A plane passing A point parallel to ANS horizontal plane); 4, B point horizontal plane (B point-Gonion Lt.-Gonion Rt.); 5, antegonion horizontal plane (A plane passing center of gonion parallel to B point horizontal plane).

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  Fig 2. Maxillary reference plane. 5 reference planes (A) perpendicular to ANS horizontal plane and reference points (B, C) for linear measurement.

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  Fig 3. Mandibular reference plane. 5 reference planes (A) perpendicular to B point horizontal plane and reference points (B, C) for linear measurement.

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  Fig 4. ANS (A) and A point (B) horizontal plane and maxillary measurements. The landmarks are described in Table 1.

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  Fig 5. B point (A) and antegonion (B) horizontal plane and mandibular measurements. The landmarks are described in Table 2.

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  Fig 6. The coordinates in A point reference plane (A) and superimposition (B), Class III group is red and normal group is blue.

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  Fig 7. The coordinates in B point reference plane (A) and superimposition (B), Class III group is red and normal group is blue.

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