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Distribution of samples
| Group 1 | Application of bonding agent as by manufacturer and placement of composite immediately |
| Group 2 | Application of bonding agent and composite similar to group 1, with hydrophobic layer curing before composite placement |
| Group 3 | Application of bonding agent similar to group 1, with 2-min delay in composite placement |
| Group 4 | Application similar to group 2, with 2-min delay in composite placement |
