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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

Cone-beam computed tomography-based registration of crown and root positions. A, Comparison of pretreatment (yellow) and post-treatment (pink) root positions. A small amount of movement is visible in the apical part while the coronal part appears to have moved to a great extent. B, Detection map after registration. The crown and most of the apical part appear dark blue (registration accuracy ≤ 0.15 mm), while the anterior crown is red.
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Figure 3: Cone-beam computed tomography-based registration of crown and root positions. A, Comparison of pretreatment (yellow) and post-treatment (pink) root positions. A small amount of movement is visible in the apical part while the coronal part appears to have moved to a great extent. B, Detection map after registration. The crown and most of the apical part appear dark blue (registration accuracy ≤ 0.15 mm), while the anterior crown is red.

Mentions: The mean change was 0.226 ± 0.032 mm in the maxilla and 0.211 ± 0.026 mm in the mandible (Figure 2B and 2C). The mean differences in the positions of the maxillary and mandibular crowns were 2.526 ± 0.415 and 2.478 ± 0.372 mm, respectively (Figure 2A). Therefore, the average tooth movement was approximately 2.5 mm. The mean change in the maxillary root positions was 0.418 ± 0.059 mm and that of the mandibular root positions was 0.375 ± 0.066 mm. The amount of movement in the apical region was minimum (Figure 3).


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)

Cone-beam computed tomography-based registration of crown and root positions. A, Comparison of pretreatment (yellow) and post-treatment (pink) root positions. A small amount of movement is visible in the apical part while the coronal part appears to have moved to a great extent. B, Detection map after registration. The crown and most of the apical part appear dark blue (registration accuracy ≤ 0.15 mm), while the anterior crown is red.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Cone-beam computed tomography-based registration of crown and root positions. A, Comparison of pretreatment (yellow) and post-treatment (pink) root positions. A small amount of movement is visible in the apical part while the coronal part appears to have moved to a great extent. B, Detection map after registration. The crown and most of the apical part appear dark blue (registration accuracy ≤ 0.15 mm), while the anterior crown is red.
Mentions: The mean change was 0.226 ± 0.032 mm in the maxilla and 0.211 ± 0.026 mm in the mandible (Figure 2B and 2C). The mean differences in the positions of the maxillary and mandibular crowns were 2.526 ± 0.415 and 2.478 ± 0.372 mm, respectively (Figure 2A). Therefore, the average tooth movement was approximately 2.5 mm. The mean change in the maxillary root positions was 0.418 ± 0.059 mm and that of the mandibular root positions was 0.375 ± 0.066 mm. The amount of movement in the apical region was minimum (Figure 3).

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