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Table 2 Average nickel ions’ release from the superelastic NiTi group and the heat-activated NiTi group before (“as received”) and after (“retrieved”) clinical exposure

From: An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following oral environment exposure

Average nickel ions’ release, ppb Superelastic NiTi group (n = 24) Heat-activated NiTi group (n = 24) P value between the two groups
Mean SD P value in the same group Mean SD P value in the same group
“as received” 8.36 1.81 0.005 7.92 1.89 0.008 NS
“retrieved” 5.81 2.14 5.65 1.6 NS
Difference between “as received” and “retrieved” −2.55 1.54   −2.27 1.10   NS
  1. SD standard deviation, NS not significant