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The application of 3D metrology software in the quantitative and qualitative assessment of aligner treatment outcomes

Tony Weir
Tony Weir
   | 13. Juli 2021
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Article Category: research-article
Online veröffentlicht: 13. Juli 2021
Seitenbereich: 100 - 108
DOI: https://doi.org/10.21307/aoj-2021-011
© 2021 Tony Weir published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Point cloud model derived from a 3D scan showing the multiple points identified by the software on each tooth.
Point cloud model derived from a 3D scan showing the multiple points identified by the software on each tooth.

Figure 2.

Direct measurement of models. Green = reference (predicted) model, Yellow = measured (achieved) model.
Direct measurement of models. Green = reference (predicted) model, Yellow = measured (achieved) model.

Figure 3.

Direct visual comparison. Green = reference (predicted) model, Yellow = measured (achieved) model.
Direct visual comparison. Green = reference (predicted) model, Yellow = measured (achieved) model.

Figure 4.

Single point comparison. Selection of a comparison point on superimposed models (4a) will allow generation of 3D measurements of the displacement of that point from the reference model to the measured model (4b).
Single point comparison. Selection of a comparison point on superimposed models (4a) will allow generation of 3D measurements of the displacement of that point from the reference model to the measured model (4b).

Figure 5.

The heat map scale, showing controls that can be used to alter the scale. Current image is set to 1 mm deviation either side of ideal, with subdivisions at 0.1 mm.
The heat map scale, showing controls that can be used to alter the scale. Current image is set to 1 mm deviation either side of ideal, with subdivisions at 0.1 mm.

Figure 6.

3D heat map superimposition at different levels of discrimination. 6a: Scale 0.5 mm either side of ideal with 0.05 mm subdivisions. 6b: Scale 1 mm with 0.1 mm subdivisions. 6c: Scale 2 mm with 0.2 mm subdivisions.
3D heat map superimposition at different levels of discrimination. 6a: Scale 0.5 mm either side of ideal with 0.05 mm subdivisions. 6b: Scale 1 mm with 0.1 mm subdivisions. 6c: Scale 2 mm with 0.2 mm subdivisions.

Figure 7.

2D slices for heat map superimposition in the three planes of space. NB, a slice can be made at any point or level through the model.
2D slices for heat map superimposition in the three planes of space. NB, a slice can be made at any point or level through the model.

Figure 8.

A 2D slice heat map generated in the X axis through the upper right central incisor. The reference model is in black, the measured model is coloured, depending on direction and amount of displacement. In this model the incisor crown is displaced more palatally and slightly more incisally than the prescribed position.
A 2D slice heat map generated in the X axis through the upper right central incisor. The reference model is in black, the measured model is coloured, depending on direction and amount of displacement. In this model the incisor crown is displaced more palatally and slightly more incisally than the prescribed position.

Figure 9.

2D slices can be further measured by clicking on a particular line of displacement, generating, to four decimal points, the displacement of that point from reference to measured model.
2D slices can be further measured by clicking on a particular line of displacement, generating, to four decimal points, the displacement of that point from reference to measured model.

Figure 10.

The displacement of the point selected in Figure 9 above can also be checked in three dimensions using the Point Comparison method demonstrated in Figure 4, allowing determination of the actual displacement.
The displacement of the point selected in Figure 9 above can also be checked in three dimensions using the Point Comparison method demonstrated in Figure 4, allowing determination of the actual displacement.

Figure 11.

Case example at treatment start. Teeth 15, 25 to be extracted.
Case example at treatment start. Teeth 15, 25 to be extracted.

Figure 12.

Case at completion of the initial series of aligners, before additional aligners, showing especially the left side posterior open bite.
Case at completion of the initial series of aligners, before additional aligners, showing especially the left side posterior open bite.

Figure 13.

3D heat map demonstrating accuracy of tooth movements.
3D heat map demonstrating accuracy of tooth movements.

Figure 14.

2D slice of the upper left central incisor and the upper left buccal segment (molars).
2D slice of the upper left central incisor and the upper left buccal segment (molars).
eISSN:
2207-7480
Sprache:
Englisch
Zeitrahmen der Veröffentlichung:
Volume Open
Fachgebiete der Zeitschrift:
Medizin, Vorklinische Medizin, Grundlagenmedizin, andere
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