# MCQ 4: Which of the following materials cannot be used as a base under composite restorations?

# 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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#MCQ 3 # Which of the following materials could be used for cementing a bridge as well as restoring a cervical lesion?

# Which of the following materials could be used for cementing a bridge as well as restoring a cervical lesion?
A. Glass Ionomer cement
B. Zinc Polycarboxylate
C. Zinc Phosphate
D. Zinc Oxide Eugenol

Answer:
Correct Answer is: A. Glass Ionomer Cement

Only glass ionomer is used as a cement (luting agent) and a permanent restorative material.
Glass ionomer cement is often used for root surface carious lesions because of the potential advantage of fluoride release in helping to control the spread of caries.

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# MCQ 2 : Gutta Percha is Plasticized/Softened by:

# Gutta Percha is plasticized / softened by:

A. Alcohol

B. Chloroform

C. Eugenol

D. EDTA

Ans:

Reference: Grossman's Endodontic Practice, 13th Edition Page no. 366

Correct answer is B. Chloroform

Gutta Percha can be plasticized by chemical solvents such as Chloroform, Eucalyptol, or xylol  which enables the gutta percha to flow into small and curved wavy canals. 

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MCQ 1: The Largest Component of Gutta Percha Cones is:

# The Largest Component of Gutta Percha Cones is:
A. Gutta Percha
B. Zinc Oxide
C. Resins and Waxes
D. Coloring Agents