Endodontics Practice

5 MCQs • Practice Free attempt

Practice Test

Endodontics — 5 Questions

1
Endodontics

The radiopacity of gutta-percha cones is mainly due to the presence of:

1) Calcium hydroxide
2) Zinc oxide
3) barium sulfate
4) Eugenol

📝 Explanation:

Radiopacifiers such as barium sulfate or bismuth compounds allow gutta-percha to be visualized on radiographs.

2
Endodontics
The principal constituent of conventional gutta-percha cones is:

1) Zinc oxide
2) Natural gutta-percha polymer
3) Barium sulfate
4) Calcium hydroxide

📝 Explanation:

Although named after gutta-percha, conventional cones contain:

Zinc oxide: 6075%
Gutta-percha polymer: 1822%
Heavy metal sulfates (radiopacifiers): 1117%
Waxes/resins: 14%

Therefore, zinc oxide is the major constituent by weight.

NEET MDS Pearl

Major component = Zinc oxide
Core polymer = Gutta-percha

3
Endodontics
Which of the following best describes the primary function of gutta-percha in root canal obturation?

1) Bonds chemically to dentin
2) Seals dentinal tubules by itself
3) Serves as an inert core filling material
4) Stimulates reparative dentin formation

📝 Explanation:

Gutta-percha is biocompatible, inert, dimensionally stable, and radiopaque. It acts as the core obturating material, while the root canal sealer fills microscopic gaps between gutta-percha and canal walls. Gutta-percha does not chemically bond to dentin and cannot seal dentinal tubules by itself.

NEET MDS Pearl

Gutta-percha = Core material
Sealer = Hermetic seal

4
Endodontics
Angle of the tip of an endodontic instrument according to ISO specifications is:

1) 75 + 15
2) 75 15
3) 80
4) None of the above

📝 Explanation:

The International Organization for Standardization (ISO) has standardized the design of endodontic instruments (files and reamers).

One of the critical parameters is the tip angle, which determines how the instrument engages dentin and initiates cutting.

The tip angle is specified as 75 15, meaning it can range from 60 to 90 depending on the instrument type and manufacturer.

This standardization ensures uniformity, predictable cutting efficiency, and safety during root canal preparation.

5
Endodontics
D2 on the endodontic file indicates
1) Diameter at tip of instrument
2) Angle of instrument
3) Length of instrument
4) 1/100th mm at end of cutting blade

📝 Explanation:

The designation "D2" on an endodontic file indicates the diameter of the file at the tip, measured in hundredths of a millimeter. This helps clinicians select the appropriate file size for root canal treatment.

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