Acceso abierto

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
 y 
Joanne Choi
Joanne Choi
   | 20 mar 2024
Australasian Orthodontic Journal's Cover Image
Acerca de este artículo
Artículo anterior
Artículo siguiente
Cite
Publicado en línea: 20 mar 2024
Páginas: 60 - 66
Recibido: 01 dic 2023
Aceptado: 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
eISSN:
2207-7480
Idioma:
Inglés
Calendario de la edición:
Volume Open
Temas de la revista:
Medicine, Basic Medical Science, other
RSS Feed de revista