Download 3D CBCT cephalometric norms for Chinese adults in the Xi`an

3D CBCT cephalometric norms for Chinese adults in the Xi'an region
with normal occlusion and well-balanced faces
Zhiyao Lu,Zuolin Jin,Jinwu Chen
State Key Laboratory of Military Stomatology, Department of radiology，
School of Stomatology, The Fourth Military Medical University
Correspondence e-mail: [email protected]
Abstract
Introduction:
With the emergence and development of cone-beam computed tomography,3D
cephalometric technology has huge advantage and prospect in the orthodontic
treatment and clinical research than 2D way.However,there is no norms value of 3D
cephalometric,which hinders the application 3D cephalometric in orthordontics.
Objective: This clinical study was performed to evaluate the cephalometric features
of a Chinese population and to establish 3D cephalometric norms for Chinese adults
living in the xi'an region.
Methods: A total of 150 lateral cephalometric radiographs and 3D CBCT
cephalometric radiographs of Chinese adults (75 females and 75 males; aged 18-40
years) with Class I dental relationships,no tooth extraction,no history of orthodontic
treatment,normal overjet and overbite, and acceptable profiles were traced and
analyzed.The mean value, standard deviation and range of angular and linear
variables were calculated. The resulting norms from CBCT images were compared
with 2D cephalometric radiographs norms and results of other studies on Chinese
population by using t-test. Male and female groups were also compared using the
independent t-test (P < 0.05).
Results: All 2D cephalometric measurements were significantly different from CBCT
measurements (P < 0.05).Significant variations among measurements was noted.
Some measurements were larger on the lateral cephalogram and some were smaller,
but a pattern could be observed: midsagittal measurements were enlarged uniformly.
Conclusions: For most measured subject, 3D cephalometric value is different from 2D
value.3D norms from 150 CBCT dataset need to be further tested in orthodontics
clinic.