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NEET MDS Quiz - Practice Test
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endodontics - 3 Questions

1
Endodontics

In walking bleach procedure which of the following technique are used 
1. Sodium perborate
2. HCI
3. Carbamide peroxide
4. EDTA

📝 Explanation:

In the walking bleach procedure, sodium perborate is the primary technique used. The walking bleach method involves: 1) Mixing sodium perborate with water or 3% hydrogen peroxide to form a paste, 2) Placing this mixture in the pulp chamber of endodontically treated teeth, 3) Sealing the access cavity with temporary restoration, 4) Patient returns after 3-7 days for evaluation and possible reapplication. Sodium perborate releases oxygen slowly, providing sustained bleaching action. HCl is used in microabrasion, not walking bleach.

2
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.

3
Endodontics
A patient has been treated endodontically for a radiolucent lesion at apex. After 1 year, size of lesion increased. Most possible reason is
1) Leakage due to improper obturation
2) Persistent cystic lining
3) Failure to do apical curetage
4) All of the above

📝 Explanation:

Leakage due to improper obturation: Inadequate sealing of the root canal system allows bacteria and irritants to leak from the oral cavity back into the periapical tissues, causing the lesion to persist or enlarge.

Persistent cystic lining: A true cyst has a distinct epithelial lining that is not resolved by conventional non-surgical root canal therapy alone. If the cyst lining remains, the lesion may continue to grow.

Failure to do apical curettage: While not always necessary for non-surgical cases, in some instances where the lesion is large or persistent, surgical intervention including apical curettage (removal of the inflamed or infected periapical tissue) may be required to facilitate healing.

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