Objective: The purpose of this study was to determine and compare the shear bond strength of two self-etching primer systems to primary teeth contaminated with saliva and blood.
Materials and Methods: Clearfil SE Bond and AQ Bond were evaluated. One hundred specimens were made by seventy-five deciduous teeth(fifty anterior and twenty-five posterior teeth) and divided randomly into ten groups. Small flat dentinal surfaces were prepared by grinding the buccal, lingual and labial areas. Specific surface treatments were applied to each group: (1)a self-etching primer application(control group), (2)saliva contamination followed by primer(Group I ), (3)primer curing followed by saliva contamination (Group H), (4)blood contamination followed by primer(Group III), (5)primer curing followed by blood contamination(Group IV). After bonding of composite resin(Z100, 3M, USA) to contaminated sample surfaces and thermocycling(1,000 cycles), shear bond strengths were measured using Universal Testing Machine(Zwick Z020, Zwick Co., Germany).
Results: The results were as follows;
1. Group I showed lower shear bond strength than control group but no statistically significant difference was found(P>0.05).
2. Group E and blood contamination group(Group III & IV) showed significantly lower shear bond strength than control group(P<0.01).
3. The shear bond strength of Clearfil SE Bond was significantly higher than that of AQ Bond(P<0.05).
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