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Biomechanical aging behaviour of clear aligners

Li Mei
Li Mei
, 
Carrol Jin
Carrol Jin
, 
Aishah Na
Aishah Na
, 
Jamie Marra
Jamie Marra
, 
Simon Guan
Simon Guan
 e 
Joanne Choi
Joanne Choi
   | 20 mar 2024
Australasian Orthodontic Journal's Cover Image
INFORMAZIONI SU QUESTO ARTICOLO
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Pubblicato online: 20 mar 2024
Pagine: 60 - 66
Ricevuto: 01 dic 2023
Accettato: 01 feb 2024
DOI: https://doi.org/10.2478/aoj-2024-0006
© 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.
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.
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.
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
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Medicine, Basic Medical Science, other
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