Table 2.

Surface roughness (Ra) and surface hardness (KHN) in Spectrum TPH groups (groups 1 and 3).

Specimen		Ra			KHN
Name	Number	Mean	SD	SE	Mean	SD	SE
Spectrum TPH	10	0.25	0.0527	0.0166	58.66	9.5083	3.0069
Spectrum TPH + Opalescence Quick	10	0.23	0.0411	0.1302	76.06	14.4434	4.5674

SD= Standard Deviation, SE=Standard Error