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http://dx.doi.org/10.4041/kjod.2015.45.6.275

Integrated three-dimensional digital assessment of accuracy of anterior tooth movement using clear aligners  

Zhang, Xiao-Juan (Department of Orthodontics, Capital Medical University School of Stomatology)
He, Li (Department of Orthodontics, Yan'an University Affiliated Hospital)
Guo, Hong-Ming (Department of Orthodontics, Capital Medical University School of Stomatology)
Tian, Jie (Private Practice)
Bai, Yu-Xing (Department of Orthodontics, Capital Medical University School of Stomatology)
Li, Song (Department of Orthodontics, Capital Medical University School of Stomatology)
Publication Information
The korean journal of orthodontics / v.45, no.6, 2015 , pp. 275-281 More about this Journal
Abstract
Objective: To assess the accuracy of anterior tooth movement using clear aligners in integrated three-dimensional digital models. Methods: Cone-beam computed tomography was performed before and after treatment with clear aligners in 32 patients. Plaster casts were laser-scanned for virtual setup and aligner fabrication. Differences in predicted and achieved root and crown positions of anterior teeth were compared on superimposed maxillofacial digital images and virtual models and analyzed by Student's t-test. Results: The mean discrepancies in maxillary and mandibular crown positions were $0.376{\pm}0.041mm$ and $0.398{\pm}0.037mm$, respectively. Maxillary and mandibular root positions differed by $2.062{\pm}0.128mm$ and $1.941{\pm}0.154mm$, respectively. Conclusions: Crowns but not roots of anterior teeth can be moved to designated positions using clear aligners, because these appliances cause tooth movement by tilting motion.
Keywords
Clear aligners; Registration; Cone-beam computed tomography;
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