Abstract
We previously reported that <Phytic acid (PYA)-SnF
2> primer is a useful tooth conditioner for bonding dental adhesives containing a functional monomer with phosphoric or carboxylic acid groups and glass polyalkenoate cements to tooth substrates. However, treatment with this primer requires two steps. Therefore, to simplify the conditioning steps, we prepared 4 tooth conditioners composed of a 10% aqueous solution of PYA mixed with 0.02〜0.5mol of SnF
2 to PYA and compared these with conventional <PYA-SnF
2> primer. The effects of these conditioners were evaluated by the bond strength of Photo Bond
® to bovine dentin and enamel and by SEM observations of the treated tooth surface.
The bond strength to dentin and enamel treated with any of the 4 tooth conditoners was lower than that of specimens treated with conventional <PYA-SnF
2> primer, especially bond strength to enamel. The ability of these one-step conditioners to decalcify the treated surface decreased with increases in the concentration of SnF
2. In these one-step conditioners, Sn
2+ seems to have reacted with PYA in solution thus resulting in a decreased ability to decalcify tooth. The chelate compounds of PYA and Sn
2+resulting from this reaction seemed to be easily washed away by rinsing after treatment and not fixed on the treated surface. This could explain why one-step conditioners were less effective than two-step <PYA-SnF
2> primer.
