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NEET MDS Quiz - Practice Test

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endodontics - 3 Questions

1
Endodontics
Endodontically treated posterior teeth are more susceptible to fracture that untreated posterior teeth. The best explanation for this is 
 1. Moisture loss
 2. Loss of root vitality
 3. Plastic deformation of dentin
 4. Destruction of the coronal architecture

πŸ“ Explanation:

Loss of Coronal Structure: During endodontic treatment, the coronal portion of the tooth may be significantly altered or reduced, especially if there is extensive decay or if a crown is required after treatment. The loss of tooth structure compromises the tooth's ability to withstand occlusal forces.

2
Endodontics
Replacement resorption results in 
 1. Ankylosis
 2. Pain
 3. PA abscess
 4. All of the above

πŸ“ Explanation:

Replacement resorption results in ankylosis. This process involves: 1) Loss of periodontal ligament due to trauma or infection, 2) Direct contact between root surface and alveolar bone, 3) Osteoblasts lay down bone tissue directly on root surface, 4) Root dentin is gradually replaced by bone tissue, 5) Tooth becomes fused to surrounding bone (ankylosis). This condition is irreversible and eventually leads to complete replacement of root structure with bone. Pain and periapical abscess are not typical consequences of replacement resorption itself.

3
Endodontics
The irrigating should used with ultrasonic instruments used for preparation of root canal is
1) Sodium hypochlorite
2) Normal saline
3) Hydrogen peroxide
4) Chloramine

πŸ“ Explanation:

Sodium hypochlorite is commonly used as an irrigating solution with ultrasonic instruments in endodontic treatment for its antimicrobial properties. It helps in the cleaning and disinfection of the root canal system by removing organic debris and bacteria. Normal saline, hydrogen peroxide, and chloramine are also used as irrigants, but sodium hypochlorite is the most effective in eliminating bacteria.

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