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

Zhang XJ, He L, Guo HM, Tian J, Bai YX, Li S - Korean J Orthod (2015)

Bottom Line: 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.Maxillary and mandibular root positions differed by 2.062 ± 0.128 mm and 1.941 ± 0.154 mm, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Capital Medical University School of Stomatology, Beijing, China. ; Department of Orthodontics, Luhe Hospital of China Capital Medical University, Beijing, China.

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 ± 0.041 mm and 0.398 ± 0.037 mm, respectively. Maxillary and mandibular root positions differed by 2.062 ± 0.128 mm and 1.941 ± 0.154 mm, 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.

No MeSH data available.


Related in: MedlinePlus

Construction of the integrated three-dimensional digital model. A, The integrated model; B, images of the maxilla and mandible; C, images of the complete dentition.
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Figure 1: Construction of the integrated three-dimensional digital model. A, The integrated model; B, images of the maxilla and mandible; C, images of the complete dentition.

Mentions: The CBCT and laser-scanned images were inputted into Rapidform 2006 software (Rapidform, Inc., Sunnyvale, CA, USA). After initial registration, surface characteristic-based automated registration of the CBCT and laser-scanned models was performed using the buccal and lingual sides of the jaws as areas of optimal overlap. The overlapping portion of the CBCT-imaged crowns was removed using Magics 9.51 software (Materialise). Each final digital model included accurate crown positions determined by laser scanning and root and jaw positions derived by CBCT imaging (Figure 1). Integrated models were inputted into OrthoDS 4.6 software (EA, Inc., Shanghai, China) for virtual setup according to Andrews' six keys to normal occlusion, without dehiscence, fenestration, and root unparallelism.


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

Zhang XJ, He L, Guo HM, Tian J, Bai YX, Li S - Korean J Orthod (2015)

Construction of the integrated three-dimensional digital model. A, The integrated model; B, images of the maxilla and mandible; C, images of the complete dentition.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664903&req=5

Figure 1: Construction of the integrated three-dimensional digital model. A, The integrated model; B, images of the maxilla and mandible; C, images of the complete dentition.
Mentions: The CBCT and laser-scanned images were inputted into Rapidform 2006 software (Rapidform, Inc., Sunnyvale, CA, USA). After initial registration, surface characteristic-based automated registration of the CBCT and laser-scanned models was performed using the buccal and lingual sides of the jaws as areas of optimal overlap. The overlapping portion of the CBCT-imaged crowns was removed using Magics 9.51 software (Materialise). Each final digital model included accurate crown positions determined by laser scanning and root and jaw positions derived by CBCT imaging (Figure 1). Integrated models were inputted into OrthoDS 4.6 software (EA, Inc., Shanghai, China) for virtual setup according to Andrews' six keys to normal occlusion, without dehiscence, fenestration, and root unparallelism.

Bottom Line: 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.Maxillary and mandibular root positions differed by 2.062 ± 0.128 mm and 1.941 ± 0.154 mm, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Capital Medical University School of Stomatology, Beijing, China. ; Department of Orthodontics, Luhe Hospital of China Capital Medical University, Beijing, China.

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 ± 0.041 mm and 0.398 ± 0.037 mm, respectively. Maxillary and mandibular root positions differed by 2.062 ± 0.128 mm and 1.941 ± 0.154 mm, 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.

No MeSH data available.


Related in: MedlinePlus