Mean difference was found to be maximum between Groups I and IIb and minimum between Groups IIIa and IIIb. All the between-group comparisons except between Groups IIIa and IIIb were significant statistically [Table 3]. On the basis of above evaluation, the following order of shear bond strength was observed in different groups/subgroups:

IIb > IIa > IIIb ~ IIIa > I” with “IIb > IIa > IIIb > IIIa > I
dentin pretreatment with 10% sodium ascorbate for 5 min (IIa) or 10 min (IIb)
no dentin pretreatment done or dentin pretreatment with 6.5% proanthocyanidin (PA) for 5 min (IIIa) or 10 min (IIIb).
the shear bond strength of the composite resin with dentin