Table 2.

Calculation to determine the height of MTA to be taken in selected spinal tap needle

Endo file	Equivalent spinal needle gauge	Radius of endo file at tip	Radius of endo file at height 4 mm	Volume of MTA required when canal prepared with endo file	Height up to which spinal needle should be filled
60	23	0.30	0.33	1.276	6 mm
70	22	0.35	0.38	1.674	6 mm