Biomechanical aging behaviour of clear aligners
, , , , et | 20 mars 2024
Publié en ligne: 20 mars 2024
Pages: 60 - 66
Reçu: 01 déc. 2023
Accepté: 01 févr. 2024
© 2024 Li Mei et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Figure 1.
Flexural strength of the clear aligners was affected by the simulated aging process.Figure 2.
Surface roughness of the clear aligners was not significantly changed by the simulated aging process.Figure 3.
Hardness of the clear aligners was significantly reduced after 10 days of the simulated aging process.Translucency and surface roughness of clear aligners did not change significantly during the 21-day study (P > 0.05 for all, n = 3 in each group)
Translucency Parameter |
Roughness – internal surface (μm) |
Roughness – external surface (μm) |
|
|
Lower |
Upper |
|
|
Lower |
Upper |
|
|
Lower |
Upper |
|
Day |
Mean±SD |
95% CI |
95% CI |
P-value |
Mean±SD |
95% CI |
95% CI |
P-value |
Mean±SD |
95% CI |
95% CI |
P-value |
0 |
3.69 ± 0.66 |
2.05 |
5.34 |
P > 0.05 |
5.53 ± 0.26 |
4.89 |
6.17 |
P > 0.05 |
1.34 ± 0.04 |
1.23 |
1.44 |
P > 0.05 |
1 |
4.97 ± 3.32 |
-3.27 |
13.20 |
P > 0.05 |
5.30 ± 0.23 |
4.74 |
5.87 |
P > 0.05 |
1.53 ± 0.10 |
1.28 |
1.77 |
P > 0.05 |
2 |
4.31 ± 4.25 |
-6.24 |
14.86 |
P > 0.05 |
5.64 ± 0.8 |
3.65 |
7.64 |
P > 0.05 |
1.72 ± 0.06 |
1.58 |
1.87 |
P > 0.05 |
3 |
3.10 ± 1.84 |
-1.47 |
7.67 |
P > 0.05 |
5.65 ± 0.67 |
3.97 |
7.32 |
P > 0.05 |
1.44 ± 0.50 |
0.19 |
2.69 |
P > 0.05 |
4 |
4.93 ± 2.91 |
-2.30 |
12.17 |
P > 0.05 |
5.39 ± 0.41 |
4.37 |
6.4 |
P > 0.05 |
1.60 ± 0.54 |
0.27 |
2.93 |
P > 0.05 |
5 |
4.85 ± 0.91 |
2.58 |
7.12 |
P > 0.05 |
5.33 ± 0.58 |
3.9 |
6.77 |
P > 0.05 |
1.45 ± 0.30 |
0.7 |
2.2 |
P > 0.05 |
6 |
4.50 ± 1.59 |
0.54 |
8.46 |
P > 0.05 |
5.45 ± 0.49 |
4.24 |
6.65 |
P > 0.05 |
1.45 ± 0.25 |
0.84 |
2.07 |
P > 0.05 |
7 |
3.87 ± 0.75 |
2.01 |
5.73 |
P > 0.05 |
5.58 ± 0.21 |
5.05 |
6.1 |
P > 0.05 |
1.29 ± 0.19 |
0.82 |
1.75 |
P > 0.05 |
8 |
4.72 ± 0.35 |
3.86 |
5.59 |
P > 0.05 |
5.47 ± 0.49 |
4.25 |
6.68 |
P > 0.05 |
1.38 ± 0.50 |
0.14 |
2.62 |
P > 0.05 |
9 |
3.20 ± 1.59 |
-0.76 |
7.15 |
P > 0.05 |
5.27 ± 1.07 |
2.61 |
7.94 |
P > 0.05 |
1.48 ± 0.45 |
0.37 |
2.59 |
P > 0.05 |
10 |
2.35 ± 0.84 |
0.27 |
4.44 |
P > 0.05 |
5.23 ± 0.65 |
3.61 |
6.86 |
P > 0.05 |
1.65 ± 0.06 |
1.51 |
1.79 |
P > 0.05 |
11 |
3.89 ± 1.61 |
-0.11 |
7.89 |
P > 0.05 |
5.64 ± 0.03 |
5.55 |
5.73 |
P > 0.05 |
1.72 ± 0.05 |
1.59 |
1.85 |
P > 0.05 |
12 |
2.35 ± 0.19 |
1.86 |
2.83 |
P > 0.05 |
5.39 ± 0.19 |
4.92 |
5.87 |
P > 0.05 |
1.52 ± 0.13 |
1.2 |
1.84 |
P > 0.05 |
13 |
4.76 ± 1.43 |
1.20 |
8.32 |
P > 0.05 |
5.54 ± 0.08 |
5.33 |
5.74 |
P > 0.05 |
1.34 ± 0.51 |
0.07 |
2.61 |
P > 0.05 |
14 |
2.51 ± 1.06 |
-0.12 |
5.14 |
P > 0.05 |
5.45 ± 0.52 |
4.15 |
6.74 |
P > 0.05 |
1.55 ± 0.45 |
0.42 |
2.67 |
P > 0.05 |
15 |
2.53 ± 0.33 |
1.72 |
3.34 |
P > 0.05 |
5.80 ± 0.03 |
5.73 |
5.87 |
P > 0.05 |
1.27 ± 0.05 |
1.14 |
1.41 |
P > 0.05 |
16 |
3.62 ± 1.96 |
-1.24 |
8.49 |
P > 0.05 |
5.57 ± 0.52 |
4.27 |
6.86 |
P > 0.05 |
1.75 ± 0.25 |
1.14 |
2.36 |
P > 0.05 |
17 |
2.36 ± 0.39 |
1.40 |
3.32 |
P > 0.05 |
5.53 ± 0.19 |
5.07 |
6.00 |
P > 0.05 |
1.72 ± 0.10 |
1.46 |
1.98 |
P > 0.05 |
18 |
2.65 ± 1.30 |
-0.57 |
5.88 |
P > 0.05 |
5.78 ± 0.27 |
5.1 |
6.46 |
P > 0.05 |
1.63 ± 0.24 |
1.04 |
2.23 |
P > 0.05 |
19 |
5.97 ± 1.35 |
2.63 |
9.32 |
P > 0.05 |
5.41 ± 0.77 |
3.5 |
7.31 |
P > 0.05 |
1.81 ± 0.09 |
1.58 |
2.05 |
P > 0.05 |
20 |
3.75 ± 1.88 |
-0.91 |
8.41 |
P > 0.05 |
5.28 ± 0.78 |
3.34 |
7.21 |
P > 0.05 |
1.68 ± 0.18 |
1.23 |
2.14 |
P > 0.05 |
21 |
4.49 ± 0.75 |
2.64 |
6.34 |
P > 0.05 |
5.31 ± 0.78 |
3.36 |
7.25 |
P > 0.05 |
1.70 ± 0.25 |
1.07 |
2.32 |
P > 0.05 |
Tensile strength and maximum load of the clear aligners did not change significantly during the 21-day study (P > 0.05 for all, n=3 in each group)
Tensile strength (N/mm2) |
Maximum load (N/mm2) |
|
|
Lower |
Upper |
|
|
Lower |
Upper |
|
Day |
Mean±SD |
95% CI |
95% CI |
P-value |
Mean±SD |
95% CI |
95% CI |
P-value |
0 |
20.85 ± 1.08 |
18.18 |
23.53 |
> 0.05 |
104.26 ± 5.38 |
18.18 |
23.53 |
> 0.05 |
1 |
20.55 ± 2.75 |
16.17 |
24.92 |
> 0.05 |
102.74 ± 13.75 |
16.17 |
24.92 |
> 0.05 |
2 |
21.38 ± 3.38 |
16.00 |
26.76 |
> 0.05 |
106.89 ± 16.91 |
16.00 |
26.76 |
> 0.05 |
3 |
19.87 ± 3.10 |
14.93 |
24.80 |
> 0.05 |
99.34 ± 15.50 |
14.93 |
24.80 |
> 0.05 |
4 |
20.28 ± 2.44 |
16.41 |
24.16 |
> 0.05 |
101.42 ± 12.18 |
16.41 |
24.16 |
> 0.05 |
5 |
20.98 ± 3.20 |
15.88 |
26.08 |
> 0.05 |
104.91 ± 16.02 |
15.88 |
26.08 |
> 0.05 |
6 |
20.01 ± 2.61 |
15.85 |
24.16 |
> 0.05 |
100.05 ± 13.06 |
15.85 |
24.16 |
> 0.05 |
7 |
19.02 ± 0.48 |
18.26 |
19.78 |
> 0.05 |
95.11 ± 2.39 |
18.26 |
19.78 |
> 0.05 |
8 |
21.70 ± 3.90 |
15.49 |
27.91 |
> 0.05 |
108.50 ± 19.51 |
15.49 |
27.91 |
> 0.05 |
9 |
20.11 ± 3.01 |
15.32 |
24.91 |
> 0.05 |
100.57 ± 15.06 |
15.32 |
24.91 |
> 0.05 |
10 |
18.98 ± 4.34 |
12.07 |
25.88 |
> 0.05 |
94.89 ± 21.69 |
12.07 |
25.88 |
> 0.05 |
11 |
22.02 ± 2.46 |
18.10 |
25.93 |
> 0.05 |
110.08 ± 12.30 |
18.10 |
25.93 |
> 0.05 |
12 |
18.22 ± 3.48 |
12.67 |
23.76 |
> 0.05 |
91.08 ± 17.42 |
12.67 |
23.76 |
> 0.05 |
13 |
18.95 ± 2.84 |
14.43 |
23.46 |
> 0.05 |
94.74 ± 14.18 |
14.43 |
23.46 |
> 0.05 |
14 |
18.82 ± 1.56 |
16.33 |
21.31 |
> 0.05 |
94.08 ± 7.82 |
16.33 |
21.31 |
> 0.05 |
15 |
21.11 ± 2.61 |
16.95 |
25.26 |
> 0.05 |
105.53 ± 13.05 |
16.95 |
25.26 |
> 0.05 |
16 |
20.43 ± 4.67 |
13.01 |
27.85 |
> 0.05 |
102.15 ± 23.33 |
13.01 |
27.85 |
> 0.05 |
17 |
19.45 ± 3.11 |
14.51 |
24.40 |
> 0.05 |
97.27 ± 15.53 |
14.51 |
24.40 |
> 0.05 |
18 |
18.93 ± 0.32 |
18.41 |
19.44 |
> 0.05 |
94.65 ± 1.62 |
18.41 |
19.44 |
> 0.05 |
19 |
21.08 ± 1.75 |
18.29 |
23.86 |
> 0.05 |
105.38 ± 8.75 |
18.29 |
23.86 |
> 0.05 |
20 |
18.40 ± 2.80 |
13.94 |
22.86 |
> 0.05 |
91.99 ± 14.01 |
13.94 |
22.86 |
> 0.05 |
21 |
17.63 ± 3.58 |
11.94 |
23.32 |
> 0.05 |
88.17 ± 17.88 |
11.94 |
23.32 |
> 0.05 |