Oral Biology Research

Table. 4.

The average force of the three manufacturers for each cycle

Cycle Manufacturer 12.5 mm peak 11.5 mm load 1 mm unload



Mean SD Mean SD Mean SD
1st cycle Ormco 378.2b 11.3 365.1b 10.6 309.6b 8.5
AO 366.1c 5.3 353.3c 5.3 298.8c 4.5
RMO 398.8a 8.1 385.6a 7.9 326.4a 7.1
2nd cycle Ormco 365.5b 10.9 332.5b 9.5 303.2b 8.4
AO 352.8c 5.1 318.7c 4.9 291.5c 4.4
RMO 385.3a 8.0 349.0a 7.3 320.5a 7.2
3rd cycle Ormco 358.6b 10.1 323.1b 9.3 299.5b 8.4
AO 346.3c 5.1 309.6c 4.9 287.8c 4.6
RMO 379.1a 8.4 340.0a 7.4 316.8a 7.5
4th cycle Ormco 354.3b 10.5 318.1b 9.3 297.0b 8.5
AO 341.3c 4.8 304.4c 4.8 284.9c 4.5
RMO 374.5a 8.3 334.6a 7.7 314.3a 7.5
5th cycle Ormco 351.2b 10.4 314.6b 9.0 295.1b 8.7
AO 338.0c 4.8 300.6c 4.5 282.5c 4.3
RMO 371.5a 8.7 330.9a 7.8 312.1a 7.8

Three manufacturers: Gereration II power chain (Ormco, Glendora, CA, USA), Memory chain (American Orthodontics, Sheboygan, MI, USA), Energy chain (RMO, Denver, CO, USA). Unit: gram-force (gf).

SD, standard deviation.

a,b,cDifferent letters indicate significant statistical differences among manufacturers (p<0.05, Tukey HSD test).

Oral Biol Res 2022;46:71~77 https://doi.org/10.21851/obr.46.02.202206.71
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