Table 1.

Arch wires (inches) used in each clinical sequence.

Schedule	Conventional NiTi arch wires	NiTi heat-activated arch wires
First month	.012′′ NiTi
Second month	.016′′ NiTi	.018′′ NiTi heat-activated
Third month	.018′′ NiTi	.016′′  × .022′′ NiTi heat-activated
Fourth month	.019′′  × .025′′ NiTi
Fifth month	.019′′  × .025′′ steel