Table 2.

Comparison of mean values of tensile properties and surface roughness for as-received group (Subgroup 1) and nonfluoride control group (Subgroup 2)

Group	Parameter	Mean±SD		P*
		Subgroup - 1	Subgroup - 2
I (NiTi)	Tensile strength	1328.8±32.6	1301.8±40.4	0.12 (NS)
	Elongation rate	21.1±0.9	21.0±0.7	0.79 (NS)
	Ra	422.5±23.1	431.7±24.6	0.40 (NS)
	Rq	549.5±22.5	573.2±27.3	0.048 (significant)
II (heat activated NiTi)	Tensile strength	1152.2±35.5	1135.5±26.7	0.25 (NS)
	Elongation rate	22.3±1.3	21.9±1.5	0.51 (NS)
	Ra	411.0±35.7	456.8±34.7	0.009 (significant)
	Rq	549.1±39.0	594.3±40.2	0.02 (significant)
III (TMA)	Tensile strength	1108.7±26.6	1086.9±28.5	0.10 (NS)
	Elongation rate	5.1±1.2	5.0±1.0	0.72 (NS)
	Ra	427.8±40.9	464.7±35.5	0.045 (significant)
	Rq	559.2±61.3	609.3±42.8	0.048 (significant)

Ra: Roughness average, Rq: Root mean square roughness, SD: Standard deviation, NS: Not significant, NiTi: Nickel Titanium, TMA: Titanium Molybdenum alloy