6. Kuncio D, Maganzini A, Shelton C, et al. Invisalign and traditional orthodontic treatment postretention outcomes compared using the American Board of Orthodontics Objective Grading System. Angle Orthod, 2007, 77(5): 864-869.
[7]
7. Boyd R L, Miller R J, Vlasklic V. The invisalign system in adult orthodontics:Mild crowding and space closure cases. J Clin Orthod, 2000, 34(4): 203-212.
[8]
8. Gan Yangzhou, Xia Zeyang, Xiong Jing, et al. Toward accurate tooth segmentation from computed tomography images using a hybrid level set model. Med Phys, 2015, 42(1): 14-27.
[9]
9. Xia Zeyang, Gan Yangzhou, Xiong Jing, et al. Crown segmentation from computed tomography images with metal artifacts. IEEE Signal Process Lett, 2016, 23(5): 678-682.
[10]
10. de Waard O, Rangel F A, Fudalej P S, et al. Reproducibility and accuracy of linear measurements on dental models derived from cone-beam computed tomography compared with digital dental casts. Am J Orthod Dentofacial Orthop, 2014, 146(3): 328-336.
[11]
11. Lorensen W E, Cline H E. Marching cubes:a high resolution 3d surface construction algorithm. Comput Graphics, 1987, 21(4): 163-169.
13. Adams R, Bischof L. Seeded region growing. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1994, 16(6): 641-647.
[14]
14. Jolliffe I T. Principal component analysis. 2nd ed. New York: Springer, 2002: 1-488.
[15]
15. Besl P J, Mckay N D. A method for registration of 3-D shapes. Pattern Analysis and Machine Intelligence, IEEE Transactions on, 1992, 14(2): 239-256.
[16]
16. Wald I, Havran V. On building fast kd-Trees for Ray Tracing,and on doing that in O(N log N)//IEEE Symposium on Interactive Ray Tracing IEEE Computer Society, Salt Lake City, 2006: 61-69.
[17]
17. Kuo C C, Yau H T. A delaunay-based region-growing approach to surface Reconstruction from unorganized points. Comput Aided Des, 2005, 37(8): 825-835.
[18]
18. Kim B C, Lee C E, Park W, et al. Integration accuracy of digital dental models and 3-dimensional computerized tomography images by sequential point- and surface-based markerless registration. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2010, 110(3): 370-378.
[19]
19. Ye Niansong, Long Hu, Xue J, et al. Integration accuracy of laser-scanned dental models into maxillofacial cone beam computed tomography images of different voxel sizes with different segmentation threshold settings. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2014, 117(6): 780-786.