The use of an etchant and bonding system before insertion of a composite resin restoration results in 1. improved retention of the restoration. 2. decreased marginal leakage. 3. reduced polymerization shrinkage effect. 4. greater strength of the restoration
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above.
(4) only
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