Biomechanical aging behaviour of clear aligners

Li Mei; Carrol Jin; Aishah Na; Jamie Marra; Simon Guan; Joanne Choi

doi:10.2478/aoj-2024-0006

Figures & Tables

Flexural strength of the clear aligners was affected by the simulated aging process.

Surface roughness of the clear aligners was not significantly changed by 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

Biomechanical aging behaviour of clear aligners

Figures & Tables

Figure 1.

Figure 2.

Figure 3.

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)

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)

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