Jiaying Liu


The long axis of a tooth is defined as the geometric axis that passes longitudinally through the tooth and through the center of the tooth, which is one of the most important reference elements for dental analysis and treatment. In the preoperative planning of dental implants, doctors usually examine the axes of adjacent teeth and occlusal axes of missing teeth. When orthognathic surgery is used to treat dental deformities, it is necessary to consider the intersection angle of upper and lower occlusal axes, so as to improve the performance and aesthetics of the masticatory system. However, the traditional method of determining the long axis of teeth depends too much on the experience of doctors, and its efficiency is inefficient and its accuracy is not guaranteed, which often affects the effect of dental treatment. Digital determination of dental long axis technology provides great possibility and convenience to improve the safety of treatment and accelerate postoperative recovery. With the popularity of cone beam computed tomography (CBCT), we can accurately calculate the long axis of teeth through the three-dimensional display of teeth and periodontal tissue. In this paper, the key technologies of tooth long axis calculation are introduced in detail.


Long axis of teeth; CBCT; Dental Sciences.

Full Text:



Jing Qiao,Shiying Wang,Jinyu Duan,Yong Zhang,Yun Qiu,Changzhou Sun,Denggao Liu. The accuracy of cone‐beam computed tomography in assessing maxillary molar furcation involvement[J]. Journal of Clinical Periodontology,2014,41(3).



I. Turkyilmaz, Implant Dentistry - The Most Promising Discipline of Den-tistry. Rijeka, Croatia: InTech, 2011.

G. R. Swennen, W. Mollemans, D. Clercq, J. Abeloos, P. Lamoral,F. Lippens, N. Neyt, J. Casselman, and F. Schutyser, “A cone-beam com-puted tomography triple scan procedure to obtain a three-dimensional augmented virtual skull model appropriate for orthognathic surgery plan-ning,” J. Craniofac Surg., vol. 20, no. 2, pp. 297–307, 2009.

B. Chow and A. Lau, “The planning of orthognathic surgery - The digital era,” Hong Kong Med. Diary, vol. 14, no. 6, pp. 11–14, 2009.


Naumovich S S,Naumovich S A,Goncharenko V G. Three-dimensional reconstruction of teeth and jaws based on segmentation of CT images using watershed transformation.[J]. Dento maxillo facial radiology,2015,44(4).

Wu T,Zhang L B. Three dimention tooth reconstruction using level set active contour model[J]. Journal of Image and Graphics,2016,21( 8) : 1078-1087.


Xie J, Liu Y, Yin J, Qiu T, Huang Y, Wang L. An interactive method for computing tooth-root axis from 3D CT image. 2010 Inter-national Conference on Medical Image Analysis and Clinical Application, MIACA 2010, pp. 42–45.

Kim Gyehyun,Lee Jeongjin,Seo Jinwook,Lee Wooshik,Shin Yeong-Gil,Kim Bohyoung. Automatic teeth axes calculation for well-aligned teeth using cost profile analysis along teeth center arch.[J]. IEEE transactions on bio-medical engineering,2012,59(4).

Wang Yang,Wu Lin,Guo Huayan,Qiu Tiantian,Huang Yuanliang,Lin Bin,Wang Lisheng. Computation of tooth axes of existent and missing teeth from 3D CT images.[J]. Biomedizinische Technik. Biomedical engineering,2015,60(6).

Dongxia Zhang,Yangzhou Gan,Zeyang Xia,Xinwen Zhou,Shoubin Liu,Jing Xiong,Guanglin Li. Molar axis estimation from computed tomography images.[J]. Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference,2016,2016.

Li X , Chen M , Tang K . A Simple and Automatic Method for Locating Surgical Guide Hole[J]. 3d Research, 2017, 8(4):36.

Terada K , Kameda T , Kageyama I , et al. Estimation of three-dimensional long axes of the maxillary and mandibular first molars with regression analysis[J]. Anatomical ence International, 2020, 95(1):126-133.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Copyright © 2019 International Educational Applied Scientific Research Journal