三维颅面水平参考平面的确定方法

doi:10.19723/j.issn.1671-167X.2019.05.024

Abstract

Abstract:

Objective: To compare four different three-dimensional horizontal planes and detect anatomical landmarks so as to provide theoretical reference for horizontal reference plane constructed by three-dimensional cephalometry. Methods: The subjects of this study were 32 facial symmetry patients (menton from mid-sagittal plane ≤2 mm). Cone-bead computed tomography (CBCT) was obtained before orthodontic treatment, and the data were imported into Dolphin imaging soft in DICOM format. The sagittal plane was passing through the Nasion, Sella and Dent. Four horizontal reference planes were constructed by three points of bilateral porion and bilateral orbitale. Plane 1: horizontal reference plane constructed by right porion and bilateral orbitale. Plane 2: horizontal reference plane constructed by left porion and bilateral orbitale. Plane 3: horizontal reference plane constructed by bilateral porion and right orbitale. Plane 4: horizontal reference plane constructed by bilateral porion and left orbitale. Pitch, yaw, roll for four planes were measured three dimensionally. All the samples were measured two times by one judge at an interval of two weeks. The two times measuring results were evaluated with Intraclass correlation coefficient (ICC) for verifying reliability. The multiple sets of repeated measurement analysis were used to compare the four different planes. Based on ages, the samples were divided into two groups (group 1: ages 13 to 17, group 2: over 18 years), the mean and standard deviation of landmark coordinates measured with Dent as the origin point, the circumference formula was applied to calculate the change of landmark position generated by head rotation. Results: No significant differences of pitch, yaw and roll among the four planes (P=0.196, 0.314, and 0.341). One degree of pitch rotation made changes of porion and orbitale approximate 0.5 mm, and 1.6 mm, respectively. One degree of yaw rotation made changes of porion and orbitale approximate 1.1 mm, and 1.5 mm, respectively. One degree of roll rotation made changes of porion and orbitale approximate 1.2 mm, and 0.7 mm, respectively. Conclusion: There was no significant difference among the four horizontal planes constructed by any three points of bilateral orbitales and bilateral porions. It has the highest concordance using bilateral orbitales and one porion to construct horizontal plane in this study, probably the best option in clinical practice. Different head rotation generated different distance changes of anatomical landmarks.

Key words: Head position, Frankfort plane, Cone beam computed tomography, Three-dimensional cephalometry

CLC Number:

R783.5

Min-jung KIM,Yi LIU. Using three-dimensional craniofacial images to construct horizontal reference plane[J].Journal of Peking University(Health Sciences), 2019, 51(5): 937-943.

Figures/Tables 9

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References 24

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Landmark	Definition
Menton	The lowest point on the symphyseal shadow of the mandible
Sella	The geometric center of the pituitary fossa
Dentes epistrophei	The most posterior point of dentes epistrophei
Nasion	The most anterior point on frontonasal suture in the midsagittal plane
Orbitale	The lowest point on the inferior rim of the orbit
Porion	The most superiorly positioned point of the external auditory meatus

Items	+	-
Pitch	Downward	Upward
Yaw	Right posterior	Left after
Roll	Lower right	Left lower

Rotarion	Definition
Pitch	Rotates around the X-axis, intersection between horizontal reference plane and rotated horizontal plane projected to MSP
Yaw	Rotates around the Y-axis, intersection between MSP reference plane and rotated MSP projected to horizontal reference plane
Roll	Rotates around the Z-axis, intersection between horizontal reference plane and rotated horizontal plane projected to coronal plane

Items	Rp-Lp	Rp-Ro	Rp-Lo
Pitch	-0.078±0.892	0.023±0.505	-0.121±0.850
Yaw	0.032±0.177	-0.002±0.010	0.002±0.008
Roll	-0.013±0.091	-0.048±0.753	0.117±0.636

Age groups	Coordinate	Right orbitale	Left orbitale	Right porion	Left porion
	X	31.017±2.651	31.067±2.180	59.344±3.323	61.578±5.017
13-17 years old	Y	26.967±3.998	26.800±3.944	26.700±3.803	26.739±3.826
	Z	80.622±3.944	80.467±4.149	4.811±3.790	4.033±3.524
	X	32.364±2.623	32.507±3.546	59.064±6.088	60.964±4.532
≥18 years old	Y	28.393±4.482	28.193±4.452	28.179±4.519	27.943±4.715
	Z	83.300±2.986	83.179±3.417	6.207±2.806	7.421±2.252

Using three-dimensional craniofacial images to construct horizontal reference plane

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Age groups	Rotation	Right orbitale	Left orbitale	Right porion	Left porion
	Pitch	1.484	1.480	0.474	0.472
13-17 years old	Yaw	1.508	1.505	1.039	1.077
	Roll	0.717	0.716	1.135	1.172
	Pitch	1.536	1.533	0.504	0.505
≥18 years old	Yaw	1.560	1.559	1.037	1.072
	Roll	0.751	0.751	1.142	1.170

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