The effect of post-ultraviolet light curing on the accuracy of direct-printed aligners: an in vitro study
Publié en ligne: 24 avr. 2024
Pages: 85 - 94
Reçu: 01 nov. 2023
Accepté: 01 mars 2024
© 2024 Anup Kanase et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Figure 1.
Master maxillary .STL file after scanning.Figure 2.
Aligners printed using a Form 3B printer.Figure 3.
Form Cure chamber for post-UV curing.Figure 4.
Aligner obtained after finishing and polishing.Figure 5.
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.Figure 7.
Graph showing a comparison of composite deviation between the groups.Comparison of composite deviation between the groups for first observer (N = 30)
Landmark |
No cure |
40 min cure |
60 min cure |
p-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)
Group |
Landmark |
Intra-class correlation coefficient (95% CI) |
Percentage with <0.10 mm difference |
p-value |
No cure |
R1 |
0.265 (-0.401–0.748) |
50% |
0.215 |
|
L1 |
-0.121 (-0.674–0.519) |
50% |
0.639 |
|
R3 |
0.671 (0.115–0.906) |
90% |
0.012 |
|
L3 |
0.953 (0.821–0.987) |
90% |
<0.001 |
|
R6 |
0.742 (0.253–0.929) |
90% |
0.004 |
|
L6 |
0.491 (-0.157–0.843) |
50% |
0.062 |
|
FR1 |
0.518 (-0.122–0.853) |
70% |
0.051 |
|
FL1 |
0.079 (-0.549–0.65) |
80% |
0.409 |
|
R7 |
0.958 (0.841–0.989) |
70% |
<0.001 |
|
L7 |
0.755 (0.28–0.932) |
80% |
0.004 |
40 min cure |
R1 |
0.045 (-0.573–0.630) |
70% |
0.448 |
|
L1 |
0.454 (-0.204–0.829) |
80% |
0.080 |
|
R3 |
0.802 (0.385–0.946) |
80% |
0.002 |
|
L3 |
0.327 (-0.342–0.776) |
90% |
0.163 |
|
R6 |
0.445 (-0.214–0.825) |
80% |
0.085 |
|
L6 |
0.688 (0.147–0.912) |
90% |
0.010 |
|
FR1 |
0.821 (0.432–0.952) |
100% |
0.001 |
|
FL1 |
0.393 (-0.274–0.804) |
90% |
0.116 |
|
R7 |
0.926 (0.732–0.981) |
100% |
<0.001 |
|
L7 |
0.524 (-0.114–0.855) |
80% |
0.049 |
60 min cure |
R1 |
0.079 (-0.549–0.650) |
70% |
0.409 |
|
L1 |
0.282 (-0.385–0.756) |
90% |
0.200 |
|
R3 |
0.44 (-0.22–0.823) |
100% |
0.088 |
|
L3 |
0.758 (0.286–0.933) |
80% |
0.003 |
|
R6 |
0.528 (-0.108–0.857) |
90% |
0.047 |
|
L6 |
-0.023 (-0.616–0.587) |
80% |
0.527 |
|
FR1 |
0.857 (0.526–0.962) |
90% |
<0.001 |
|
FL1 |
0.843 (0.49–0.958) |
90% |
0.001 |
|
R7 |
0.823 (0.438–0.952) |
80% |
0.001 |
|
L7 |
0.768 (0.307–0.936) |
90% |
0.003 |
Comparison of internal deviation within the group for first observer (N = 30)
Group |
Landmark |
Mean ± SD |
p-value* |
No cure |
R1 |
-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 cure |
R1 |
-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) |
|
|
FR1 |
0.07 (0.13) |
|
|
FL1 |
0.15 (0.03) |
|
|
R7 |
-0.09 (0.13) |
|
|
L7 |
-0.13 (0.08) |
|
60 min cure |
R1** |
-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) |
|
|
FR1 |
0.12 (0.07) |
|
|
FL1 |
0.18 (0.05) |
|
|
R7 |
-0.09 (0.18) |
|
|
L7** |
-0.02 (0.12) |
|
Post hoc analysis
Landmark |
No cure vs 40 min cure |
No cure vs 60 min cure |
40 min cure vs 60 min cure |
R1 |
0.249 |
0.067 |
0.762 |
L1 |
0.333 |
0.172 |
0.913 |
R3 |
0.910 |
0.859 |
0.993 |
L3 |
0.365 |
0.393 |
0.998 |
R6 |
0.004 |
0.004 |
0.997 |
L6 |
0.734 |
0.695 |
0.998 |
FR1 |
0.340 |
0.156 |
0.882 |
FL1 |
0.009 |
0.004 |
0.948 |
R7 |
0.133 |
0.139 |
1.000 |
L7 |
0.014 |
0.004 |
0.848 |