# Which of the following materials cannot be used as a base under composite restorations?
A. Zinc Phosphate
B. Zinc Polycarboxylate
C. Zinc Oxide Eugenol
D. Glass Ionomer Cement
Answer: C. Zinc Oxide Eugenol.
Reason: Residual free eugenol interferes with the proper setting of resin-based composites or resin cements. Therefore, various types of carboxylic acids have been used to replace eugenol and produce a ZOE-like material. These products are called zinc oxide-non eugenol cements.
Reference: Phillip's Science of Dental Materials, 12th Edition, Page No. 331
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