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NEET MDS Quiz - Practice Test
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Practice Test

endodontics - 3 Questions

1
Endodontics

Carbamide solution used for bleaching degrades into 
1. 0.3 % sodium perborate
2. 30 % hydrogen peroxide
3. 3 % hydrogen peroxide
4. 30 % sodium perborate

📝 Explanation:

Carbamide peroxide used in bleaching degrades into 3% hydrogen peroxide and 7% urea. The breakdown process: 1) 10% carbamide peroxide releases approximately 3% hydrogen peroxide, 2) The hydrogen peroxide is the active bleaching agent that breaks down chromophores, 3) Urea provides pH buffering and reduces sensitivity, 4) The slow release over 6-8 hours provides sustained bleaching action. This makes carbamide peroxide ideal for home bleaching as it provides controlled, sustained hydrogen peroxide release.

2
Endodontics
The vertical fracture of root seen with gutta-percha obturation is due to 
 1. The vertical compression of warm GP points
 2. Lateral condensation of GP points
 3. Use of spreader
 4. Injection molding technique

📝 Explanation:

Vertical fractures of root seen with gutta-percha obturation are due to the vertical compression of warm gutta-percha points. This occurs because: 1) Excessive vertical pressure during warm gutta-percha condensation, 2) High temperatures make the material expand and contract, creating stress, 3) Continuous downward pressure can exceed the tensile strength of dentin, 4) Thin-walled roots are particularly susceptible, 5) Over-condensation attempts to achieve dense packing. Lateral condensation and spreader use typically cause horizontal stress, not vertical fractures. Proper technique with controlled pressure helps prevent this complication.

3
Endodontics
In comprehensive treatment, sequence of treatment plan procedures
1) Relief of pain - control of caries - endodontic - periodontic procedures
2) Control of caries - relief of pain - periodontic - endodontic procedures
3) Relief of pain - control of caries - periodontic - endodontic procedures
4) No definite sequence plan

📝 Explanation:

Explanation
Relief of pain: Always the first priority. Acute pain or infection must be managed before anything else.

Control of caries: Once the patient is comfortable, caries control prevents further destruction and stabilizes the dentition.

Endodontic procedures: Teeth requiring root canal therapy are treated after caries control, ensuring they can be preserved.

Periodontic procedures: Finally, periodontal therapy is carried out to establish long-term oral health and stability.

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