Time of Application of Sodium Ascorbate on Bonding to Bleached Dentin

Table 1

The experimental groups and subgroups used in this study.

Groups		Timing of bonding procedures
Group A (mixture of SP & DW)/Group B (mixture of SP & 30% HP)	IB	Immediate bonding
	DB	Delayed bonding after 14 days
	SA 3 m	After application of SA for 3 minutes
	SA 5 m	After application of SA for 5 minutes
	SA 10 m	After application of SA for 10 minutes
	SA 30 m	After application of SA for 30 minutes
	SA 1 h	After application of SA for 1 hour
	SA 24 h	After application of SA for 24 hours
	SA 48 h	After application of SA for 48 hours
	SA 72 h	After application of SA for 72 hours
Control group,	Immersion in DW for 7 days and then bonding
no bleaching

SP: sodium perborate, DW: distilled water, HP: hydrogen peroxide, and SA: sodium ascorbate.