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The effect of post-ultraviolet light curing on the accuracy of direct-printed aligners: an in vitro study Cover

The effect of post-ultraviolet light curing on the accuracy of direct-printed aligners: an in vitro study

Open Access
|Apr 2024

Figures & Tables

Figure 1.

Master maxillary .STL file after scanning.
Master maxillary .STL file after scanning.

Figure 2.

Aligners printed using a Form 3B printer.
Aligners printed using a Form 3B printer.

Figure 3.

Form Cure chamber for post-UV curing.
Form Cure chamber for post-UV curing.

Figure 4.

Aligner obtained after finishing and polishing.
Aligner obtained after finishing and polishing.

Figure 5.

Image generated by Geomagic Control software showing location-specific deviations at specific landmarks.
Image generated by Geomagic Control software showing location-specific deviations at specific landmarks.

Figure 6.

Graph showing a comparison of internal deviation within the group.
Graph showing a comparison of internal deviation within the group.

Figure 7.

Graph showing a comparison of composite deviation between the groups.
Graph showing a comparison of composite deviation between the groups.

Comparison of composite deviation between the groups for first observer (N = 30)

LandmarkNo cure40 min cure60 min curep-value*
R1-0.48 (0.65)-0.16 (0.33)-0.03 (0.16)0.074
L1-0.46 (0.67)-0.19 (0.21)-0.11 (0.13)0.170
R3-0.18 (0.36)-0.14 (0.1)-0.13 (0.13)0.858
L3-0.25 (0.54)-0.03 (0.1)-0.04 (0.22)0.310
R6-0.66 (0.54)-0.13 (0.05)-0.15 (0.17)0.001**
L6-0.21 (0.8)-0.05 (0.17)-0.03 (0.13)0.665
FR1-0.08 (0.4)0.07 (0.13)0.12 (0.07)0.159
FL1-0.11 (0.32)0.15 (0.03)0.18 (0.05)0.002**
R7-0.38 (0.52)-0.09 (0.13)-0.09 (0.18)0.091
L7-0.73 (0.74)-0.13 (0.08)-0.02 (0.12)0.003**

Intra-class correlation coefficient between the two observers across the three groups (N = 30)

GroupLandmarkIntra-class correlation coefficient (95% CI)Percentage with <0.10 mm differencep-value
No cureR10.265 (-0.401–0.748)50%0.215
L1-0.121 (-0.674–0.519)50%0.639
R30.671 (0.115–0.906)90%0.012
L30.953 (0.821–0.987)90%<0.001
R60.742 (0.253–0.929)90%0.004
L60.491 (-0.157–0.843)50%0.062
FR10.518 (-0.122–0.853)70%0.051
FL10.079 (-0.549–0.65)80%0.409
R70.958 (0.841–0.989)70%<0.001
L70.755 (0.28–0.932)80%0.004
40 min cureR10.045 (-0.573–0.630)70%0.448
L10.454 (-0.204–0.829)80%0.080
R30.802 (0.385–0.946)80%0.002
L30.327 (-0.342–0.776)90%0.163
R60.445 (-0.214–0.825)80%0.085
L60.688 (0.147–0.912)90%0.010
FR10.821 (0.432–0.952)100%0.001
FL10.393 (-0.274–0.804)90%0.116
R70.926 (0.732–0.981)100%<0.001
L70.524 (-0.114–0.855)80%0.049
60 min cureR10.079 (-0.549–0.650)70%0.409
L10.282 (-0.385–0.756)90%0.200
R30.44 (-0.22–0.823)100%0.088
L30.758 (0.286–0.933)80%0.003
R60.528 (-0.108–0.857)90%0.047
L6-0.023 (-0.616–0.587)80%0.527
FR10.857 (0.526–0.962)90%<0.001
FL10.843 (0.49–0.958)90%0.001
R70.823 (0.438–0.952)80%0.001
L70.768 (0.307–0.936)90%0.003

Comparison of internal deviation within the group for first observer (N = 30)

GroupLandmarkMean ± SDp-value*
No cureR1-0.48 (0.65)0.140
L1-0.46 (0.67)
R3-0.18 (0.36)
L3-0.25 (0.54)
R6-0.66 (0.54)
L6-0.21 (0.8)
FR1-0.08 (0.4)
FL1-0.11 (0.32)
R7-0.38 (0.52)
L7-0.73 (0.74)
40 min cureR1-0.16 (0.33)0.006
L1-0.19 (0.21)
R3-0.14 (0.1)
L3**-0.03 (0.1)
R6-0.13 (0.05)
L6-0.05 (0.17)
FR10.07 (0.13)
FL10.15 (0.03)
R7-0.09 (0.13)
L7-0.13 (0.08)
60 min cureR1**-0.03 (0.16)<0.001
L1-0.11 (0.13)
R3-0.13 (0.13)
L3**-0.04 (0.22)
R6-0.15 (0.17)
L6**-0.03 (0.13)
FR10.12 (0.07)
FL10.18 (0.05)
R7-0.09 (0.18)
L7**-0.02 (0.12)

Post hoc analysis

LandmarkNo cure vs 40 min cureNo cure vs 60 min cure40 min cure vs 60 min cure
R10.2490.0670.762
L10.3330.1720.913
R30.9100.8590.993
L30.3650.3930.998
R60.0040.0040.997
L60.7340.6950.998
FR10.3400.1560.882
FL10.0090.0040.948
R70.1330.1391.000
L70.0140.0040.848
DOI: https://doi.org/10.2478/aoj-2024-0008 | Journal eISSN: 2207-7480 | Journal ISSN: 2207-7472
Language: English
Page range: 85 - 94
Submitted on: Nov 1, 2023
Accepted on: Mar 1, 2024
Published on: Apr 24, 2024
Published by: Australian Society of Orthodontists Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2024 Anup Kanase, Vaibhav Misra, Roohi Sobti, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.