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

Hyo-Kyung Song; Woo-Sung Son; Soo-Byung Park; Seong-Sik Kim; Yong-Il Kim

doi:10.4041/kjod.2010.40.6.373

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

Original Article

Korean J Orthod 2010;40(6):373-382.

Published online: 19 January 2010

DOI: https://doi.org/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

Hyo-Kyung Song, DDS, MSD^a, Woo-Sung Son, DDS, MSD, PhD^b, Soo-Byung Park, DDS, MSD, PhD^b, Seong-Sik Kim, DDS, MSD, PhD^c, Yong-Il Kim, DDS, MSD^d

^aResident, Pusan National University

^bProfessor, Dentistry, Pusan National University

^cAssociate Professor, Dentistry, Pusan National University

^dClinical Assistant Professor, Department of Orthodontics, School of Dentistry, Pusan National University

Corresponding author: Woo-Sung Son. Department of Orthodontics, Pusan National University Hospital, Beomeo-ri, Mulgeum-eup, Yangsan 626-770, Korea. +82 55 360 5150; e-mail, wsson@pusan.ac.kr.

Received 24 May 2011 Revised 1 October 2010 Accepted 4 October 2010

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Keywords: CBCT, Digital models, Facial asymmetry, Dental compensation analysis

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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.

Table 1.

Comparison of deviated/non-deviated side differences (dev.-ndev.) between control group and experimental group

			Control group	Experimental group	Significance
				Mean±SD
Me deviation			1.60±0.60	7.90±3.17	†
Maxillary canine		X	-0.82±3.05	2.73±4.07	∗
		Y	0.65±1.17	0.86±1.55
		Z	-0.36±0.68	-0.70±1.23
		Angle	2.23±1.52	4.62±10.38
Maxillary first molar	MB	X	-0.97±2.65	3.65±3.13	†
		Y	0.27±1.63	1.06±2.34
		Z	0.05±1.03	-1.83±1.76	∗
	DB	X	-0.74±2.42	3.85±2.94	†
		Y	0.48±1.53	1.10±2.33
		Z	0.58±1.50	-1.69±1.92	†
	MP	X	-0.80±2.67	4.01±3.22	†
		Y	0.20±1.37	0.70±2.21
		Z	-0.02±0.84	-0.19±1.53
	DP	X	-0.80±2.31	3.82±3.04	†
		Y	0.64±1.33	0.93±2.49
		Z	0.16±0.82	-0.16±1.78
		Angle	1.67±5.25	8.26±6.82	∗
Mandibularcanine		X	-1.76±4.21	-4.98±3.44
		Y	1.12±2.10	0.09±2.05
		Z	0.18±0.82	0.55±1.17
		Angle	-3.12±10.15	3.83±11.15
Mandibular first molar	MB	X	-1.51±3.52	-5.81±4.38	∗
		Y	0.76±2.53	0.10±2.76
		Z	0.03±0.86	0.11±1.75
	DB	X	-1.60±3.44	-6.34±4.68	∗
		Y	1.08±2.97	-0.26±2.87
		Z	0.15±0.97	0.80±1.77
	ML	X	-1.67±3.21	-5.80±4.44	∗
		Y	0.74±2.70	0.78±2.05
		Z	-0.03±0.79	-1.06±1.83
	DL	X	-1.31±3.22	-6.08±4.39	∗
		Y	0.86±2.65	0.49±2.41
		Z	0.09±0.73	-0.76±1.70
		Angle	0.28±5.36	8.31±7.07	∗

MB, Mesio-buccalcusp; DB, disto-buccalcusp; MP, mesio-palatalcusp; DP, disto-palatalcusp; ML, mesio-lingual cusp; DL, disto-lingualcusp; X, trans verse position difference; Y, antero-posterior position difference; Z, vertical position difference.

^∗ p ＜ 0.05;

^† p ＜ 0.01.

Table 2.

Bivariate Pearson correlation between menton deviation and deviated/non-deviated side differences (dev.-ndev.)

	U6 MB Z	U6 DB Z	U6 MP Z	U6 DP Z	U6 angle	L3 X
Me deviation Significance	†	†	∗	∗	∗	†
Correlation coefficience	-0.697	-0.659	-0.487	-0.548	0.515	-0.663
	L6 MB X	L6 DB X	L6 ML X	L6 DL X	L6 ML Z	L6 angle
Significance	†	†	†	†	∗	†
Correlation coefficience	-0.730	-0.684	-0.740	-0.699	-0.521	0.715

MB, Mesio-buccalcusp;DB, disto-buccalcusp;MP,mesio-palatalcusp;DP,disto-palatalcusp;ML,mesio-lingual cusp;DL,disto-lingualcusp;X,transversepositiondifference;Y,antero-posteriorpositiondifference;Z,vertical

^† p ＜ 0.01.

^∗ p ＜ 0.05; positiondifference.

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