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Effect of the seating pressure on the adhesive bonding of indirect restorations
Nicoletta Chieffi1, Stefano Chersoni, Federica Papacchini
1Department of Restorative Dentistry and Dental Materials, University of Siena, Italy.
Purpose:
To evaluate the effect of two different techniques of seating pressure application on the adhesive-dentin bond of indirect restorations.
Methods:
Eight non-carious human third molars were randomly divided in two treatment groups (four teeth each). Cylindrical composite blocks were luted with a resin cement (Panavia F). In Group 1, the seating pressure was applied for 5 seconds. In Group 2, the resin cylinder was maintained under constant pressure during the entire 3-minute polymerization period of the resin cement. After storing in distilled water for 24 hours, 0.9 x 0.9 mm sticks were produced from these luted specimens for microtensile bond testing and SEM examination.
Results:
The Student t-test showed a significant difference (P < 0.05) in bond strength between Groups 1 and 2. SEM revealed the presence of structural defects and resin globules on the seating surface of the composites. These features were exclusively identified from Group 1 specimens and were probably caused by fluid transudation from the underlying dentin through the simplified self-etch adhesive (ED primer).