Table 1. Means (Standard Deviations in parentheses) of surface roughness (Ra) values.

Groups	Means (SD)
Control (HT)	0.3385 (0.0281)b
Control (T)	0.3382 (0.0390)b
1	0.2186 (0.0335)a
2	0.2191 (0.0397)a
3	0.3444 (0.1354)b
4	0.2247 (0.0270)a
5	0.2467 (0.0378)a
6	0.3637 (0.0834)b