Table 1.

Mean and standard deviation of flexural strength (megapascals) of all study groups

Restorative material	Without bleaching	With bleaching*
Z250 composite resin	91.89±11.20	69.04±10.05
Cention N	89.93±9.00	69.92±10.21
Beautifil II giomer	87.31±7.46	63.45±6.80

^*P<0.001 between bleached and non-bleached specimens in all groups