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Table 2 Release of nickel in rectangular and round NiTi wires at different time points

From: Release of metal ions from round and rectangular NiTi wires

Time Rectangular wire Round wire P value
Mean ± SD Mean ± SD
1 h 243 ± 4.2 221.4 ± 1.7 0.001
24 h 319.4 ± 2.9 265.1 ± 2.7 0.001
1 week 386.1 ± 3 324.2 ± 3.6 0.001
3 weeks 410.6 ± 2.6 376 ± 3 0.001
P value 0.001 0.001 0.001