Korean J Orthod.  2010 Dec;40(6):373-382. 10.4041/kjod.2010.40.6.373.

The assessment of dentoalveolar compensation in facial asymmetry individuals: integration of cone beam CT and laser scanned dental cast images

Affiliations
  • 1Resident, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.
  • 2Professor, Department of Orthodontics, School of Dentistry, Pusan National University, Korea. wsson@pusan.ac.kr.
  • 3Associate Professor, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.
  • 4Clinical Assistant Professor, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

Abstract


OBJECTIVE
The purpose of this study was to assess the dentoalveolar compensation in facial asymmetry individuals using an integration of a CBCT image and a laser scanned dental cast image.
METHODS
The subjects consisted of 30 adults with asymmetric mandibles and 20 adults with symmetric mandibles. The CBCT and laser scanned dental cast images were integrated with a registration technique. Canine and first molar position and angulation were assessed from reference coordinates. The differences between deviated and non-deviated sides were analyzed with the paired t-test. The differences shown according to menton deviation were also statistically analyzed using Pearson correlation analysis.
RESULTS
The experimental group showed deviated and non-deviated side differences (dev.-ndev.) in the position and angle of the canine and first molars. Menton deviation showed positive correlation with the deviation side (dev.-ndev.) for the maxillary and mandibular 1st molar angles, negative correlation with the deviation side for the vertical position of the maxillary 1st molars, transverse position of the mandibular canine, transverse position and vertical position of the mesio-lingual cusp of the mandibular 1st molars.
CONCLUSIONS
The upper and lower canine and first molars of facial asymmetry individuals were compensated, so the transverse position, vertical position, and angle showed differences between the deviated/non-deviated sides.

Keyword

CBCT; Digital models; Facial asymmetry; Dental compensation analysis

MeSH Terms

Adult
Compensation and Redress
Cone-Beam Computed Tomography
Facial Asymmetry
Humans
Mandible
Molar

Figure

  • Fig 1. CBCT and scanned dental cast Images are integrated and displayed in colors on a millimeter scale.

  • Fig 2. Reference coordinates and measurements. A, Maxilla, FH plane was constructed by connecting both sides of Po and right of Or. Sagittal plane is the line perpendicular to FH plane passing through Na and Ba. Coronal plane is the line perpendicular to FH plane and sagittal plane passing through right porion; B, mandible, Mn plane was constructed by connecting Me and both sides of Go. Sagittal plane is the line perpendicular to Mn plane passing through Pog and Me. Coronal plane is the line perpendicular to Mn plane and sagittal plane passing through right Go; C, tooth coordinates (X, transverse position; Y, antero-posterior position; Z, vertical position); D, canine angulation measured as the internal angle between tangential plane of FACC of canine and sagittal plane; E, molar angulation measured as the internal angle between a normal vector of the molar cusp tip occlusal plane and the Z-axis coordinate.

  • Fig 3. The tooth of maxillary and mandibular canine and first molars of facial asymmetry individuals were compensated, sotransverse, vertical position and angle showed deviated/non-deviated side differences. A, Deviated side of maxillary canines and first molars were positioned buccally than non-deviated side; B, deviated side of mandibular first molars were positioned lingually than non-deviated side; C, deviated side of maxillary first molars were angulated bucally, and non-deviated side of them were extruded than the other side; D, deviated side of mandibular first molars were angulated lingully than non-deviated side.


Cited by  1 articles

Cone-beam computed tomography analysis of transverse dental compensation in patients with skeletal Class III malocclusion and facial asymmetry
Ji-Yea Lee, Sung-Hoon Han, Hyeong-Seok Ryu, Hee-Min Lee, Sang-Cheol Kim
Korean J Orthod. 2018;48(6):357-366.    doi: 10.4041/kjod.2018.48.6.357.


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