Limits...
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

Discrepancies in crown and root positions after treatment with clear aligners. A, Comparison of achieved (blue) and predicted (pink) crown and root positions. Only the crown reached the predicted position. B, Detection map after registration. The immovable and moved parts of molar teeth appear dark blue (registration accuracy ≤ 0.15 mm), while the crown appears red.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4664903&req=5

Figure 4: Discrepancies in crown and root positions after treatment with clear aligners. A, Comparison of achieved (blue) and predicted (pink) crown and root positions. Only the crown reached the predicted position. B, Detection map after registration. The immovable and moved parts of molar teeth appear dark blue (registration accuracy ≤ 0.15 mm), while the crown appears red.

Mentions: The mean discrepancy in the maxillary crown positions was 0.376 ± 0.041 mm, while that of the mandibular anterior teeth was 0.398 ± 0.037 mm (Table 1); only a small difference between the predicted and the achieved crown positions was observed (Figure 4).


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)

Discrepancies in crown and root positions after treatment with clear aligners. A, Comparison of achieved (blue) and predicted (pink) crown and root positions. Only the crown reached the predicted position. B, Detection map after registration. The immovable and moved parts of molar teeth appear dark blue (registration accuracy ≤ 0.15 mm), while the crown appears red.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Discrepancies in crown and root positions after treatment with clear aligners. A, Comparison of achieved (blue) and predicted (pink) crown and root positions. Only the crown reached the predicted position. B, Detection map after registration. The immovable and moved parts of molar teeth appear dark blue (registration accuracy ≤ 0.15 mm), while the crown appears red.
Mentions: The mean discrepancy in the maxillary crown positions was 0.376 ± 0.041 mm, while that of the mandibular anterior teeth was 0.398 ± 0.037 mm (Table 1); only a small difference between the predicted and the achieved crown positions was observed (Figure 4).

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