highly significantP <0.001
Figure 2 depicts the effect of different surface treatment (air abrasive and heat treatment) on the fracture strength of commercially available Ceramill (AMANNGIRRBACH) Zirconia, the result shows highly significant ( P <0.001) in the group 2, 3, 4, 5, 7, 8, 9, 10 and statistically significant ( P <0.005) in the group 6.