Table 1.
The results of retentive force measurement of 10 types of cast clasps
| 10 types of cast clasps | Model number (Nissin Co.Ltd) | Undercut amount | Assessor 1 | Assessor 2 | Assessor 3 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1st time(g) | 2nd time(g) | 3rd time(g) | 1st time(g) | 2nd time(g) | 3rd time(g) | 1st time(g) | 2nd time(g) | 3rd time(g) | |||
| RPI clasp | E3-522 | 0.25mm | 262.4 | 218.5 | 239.3 | 197.3 | 282.6 | 230.8 | 273.7 | 230.6 | 245.2 |
| Combination wire clasp | E3-583 | 0.5mm | 291.4 | 235.6 | 310.2 | 256.9 | 270.6 | 217.8 | 334.3 | 295.2 | 265.3 |
| Hairpin clasp | E3-545 | 0.5mm | 530.7 | 513.4 | 464.5 | 517.4 | 542.1 | 616.4 | 584.2 | 489.3 | 510.7 |
| Ring clasp | E3-534 | 0.5mm | 632.4 | 645.3 | 680.4 | 664.6 | 632.5 | 685.5 | 673.2 | 659.2 | 599.2 |
| Akers clasp | E3-541 | 0.5mm | 737.4 | 659.5 | 630.5 | 690.4 | 630.2 | 604.7 | 659.3 | 690.6 | 722.4 |
| Half and half clasp | E3-563 | 0.5mm | 752.3 | 680.5 | 690.8 | 732.3 | 680.4 | 713.2 | 650.2 | 732.3 | 677.3 |
| Reverse backaction clasp | E3-522 | 0.5mm | 720.5 | 740.5 | 710.3 | 650.3 | 708.5 | 743.2 | 688.4 | 751.3 | 707.3 |
| Backaction clasp | E3-567 | 0.5mm | 670.3 | 732.7 | 765.4 | 703.5 | 763.2 | 740.2 | 747.3 | 688.6 | 770.2 |
| Double Akers clasp | E3-530 | 0.5mm | 898.2 | 810.4 | 880.6 | 840.2 | 862.5 | 780.3 | 821.3 | 879.3 | 760.1 |
| Extended arm clasp | E3-546 | 0.5mm | 929.3 | 870.4 | 860.4 | 880.2 | 924.4 | 826.3 | 931.3 | 889.3 | 834.2 |