Table 4.
Summary of bisphenol-A release at different time points
| Study | n | Groups | Time 1 | Time 2 | Time 3 | Time 4 | Time 5 | Time 6 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Mean | Variance | Mean | Variance | Mean | Variance | Mean | Variance | Mean | Variance | Mean | Variance | |||
| Kotykaetal., (2014) | n=8 retainer material cut into squares | 1-Prethermoformed and thermoformed Biocryl Essix | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||
| 2-Prethermoformed Biocryl retainer | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||
| 3-Thermoformed Biocryl retainer | 760 | 846,400 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||
| 4-Prethermoformed and thermoformed dentsply raintree Essix A | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||
| 5-Unused and used Invisalign aligner | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||
| Raghavanetal., (2017) | n=45 patients | 1-Vacuum-formed retainers | 0.01 | 0.0001 | 1203.36 | 127042.3 | 2384.2 | 3229712 | 203.96 | 7584.668 | ||||
| 2-Hawley retainersheat cure | 0.06 | 0.0016 | 0.91 | 0.6561 | 0.45 | 0.0064 | 0.67 | 1.9881 | ||||||
| 3-Hawley retainerschemical cure | 0.09 | 0.0036 | 60.31 | 650.25 | 3.63 | 0.25 | 9.34 | 5.6169 | ||||||
| El Idrissi Ietal., (2020) | n=10 new aligners | 110 new “SCHEU Dental Clear Aligner®”aligners | 0 | 0 | For up to 8 weeks | |||||||||
| 10 used aligners | 2-10 used aligners from the same supplier after stay in the mouth of 15days | 0 | 0 | For up to 8 weeks | ||||||||||
| Katrasetal., (2021) | n=37 | 1-Smile direct Club aligner in artificial gastric fluid on T0, T1, T2, T6, T10, T20 | 1.53 | 0.3844 | 2.82 | 0.3364 | 0.7 | 0.0196 | 3.11 | 0.7225 | 2.4 | 0.2116 | 2.02 | 0.7569 |
| 2-Smile direct Club aligner in artificial saliva on T0, T1, T2, T6, T10, T20 | 1.4 | 0.0441 | 3.02 | 0.81 | 4.02 | 0.16 | 3.72 | 0.4225 | 3.82 | 0.2116 | 5 | 5.5696 | ||
| 3-Essix ace aligner in artificial gastric fluid on T0, T1, T2, T6, T10, T20 | 1.53 | 3844 | 3.54 | 0.2704 | 3.13 | 0.0625 | 2.73 | 0.6889 | 2.65 | 0.0576 | 1.4 | 0.1089 | ||
| 4Essix ace aligner in artificial saliva on T0, T1, T2, T6, T10, T20 | 1.4 | 0.0441 | 3.26 | 6.9696 | 3.37 | 11.9716 | 4.5 | 11.8336 | 6.3 | 22.5625 | 6.18 | 13.9876 | ||
| 5-Invisalign aligner in artificial gastric fluid on T0, T1, T2, T6, T10, T20 | 1.53 | 0.3844 | 2.39 | 0.09 | 2.66 | 0.0324 | 1.99 | 0.0484 | 2.49 | 0.4096 | 1.9 | 1.4641 | ||
| 6-Invisalign aligner in artificial saliva on T0, T1, T2, T6, T10, T20 | 1.4 | 0.0441 | 3.53 | 3.4596 | 3.16 | 1.7956 | 3.49 | 1.7689 | 0.58 | 0.0049 | 0.51 | 0.1296 | ||
| 7-Smile direct Club aligner in ethanol on T0, T1, T2, T6, T10, T20 | 1.01 | 0.0625 | 1.75 | 0.04 | - | - | - | -0 | 1.9 | 0.0169 | 1.8 | 0.1444 | ||
| 8-Essix Ace aligner in ethanol on T0, T1, T10 and T20 | 1.01 | 0.0625 | 1.52 | 0.2916 | - | - | - | - | 1.87 | 0.1024 | 0.47 | 0.0529 | ||
| 9-Invisalign aligner in ethanol on T0, T1, T10 and T20 | 1.01 | 0.0625 | 7.89 | 17.9776 | - | - | - | - | 9.18 | 22.09 | 3.89 | 6.8644 | ||