a) Covalent bond
b) Ionic bond
c) Mechanical
d) Vander waal forces
The correct answer is C. Mechanical
Bonding of composites to tooth structure occurs by micromechanical retention. Acid etching creates micro porosities into which the resin penetrates resulting in resin tag formation. These tags penetrate to a depth of 5 - 10 µm but their lengths are dependent on the enamel etching time.
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