MDS PREP
Operator can identify root curvatures ledgings an additional curvatures by
1. Perception by instrumentation
2. Radiographic examination
3. By his knowledge of tooth anatomy
4. None of the above
Endodontics
Answer: 1
Identifying Root Curvatures
Perception by instrumentation refers to the tactile
feedback that a dentist can obtain while using instruments during
procedures, allowing them to identify curvatures in the root canal system.
The success of a root canal filling is best assessed
1. Clinical observation
2. Size of gutta-percha cone used
3. Radiographs
4. By the diameter of root canal reamer
Endodontics Answer: 1
The success of a root canal filling is primarily assessed through clinical
observation, which includes monitoring for signs of pain, swelling, and
infection. While radiographs and the size of the gutta-percha cone used can
provide additional information, the ultimate determinant of success is the
patient's symptom resolution and the absence of pathology.
In Ellis classification of injured teeth a class IV represents
1. Non-vital tooth
2. Avulsed tooth
3. Fracture involving only the enamel
4. Fracture involving enamel and dentin but not pulp
Endodontics
Answer: 1
Explanation: Class IV in the Ellis classification indicates a fracture that has
resulted in pulp exposure, often leading to a non-vital tooth.
Class IV: Crown Fracture with Pulp Involvement
Description: Extensive fracture involving enamel, dentin, and pulp, often with significant loss of tooth structure.Endodontic Consideration: Endodontic treatment is necessary due to pulp exposure. The tooth may require additional restorative procedures after root canal therapy to restore function and aesthetics.
In class IV anterior tooth fracture
1. No treatment possible
2. Treatment to be given but it is problematic
3. No treatment required
4. None of the above
Endodontics
Answer: 2
Class IV: Crown Fracture with Pulp Involvement
Description: Extensive fracture involving enamel,
dentin, and pulp, often with significant loss of tooth structure.
Endodontic Consideration: Endodontic treatment is
necessary due to pulp exposure. The tooth may require additional
restorative procedures after root canal therapy to restore function and
aesthetics.
The principal cone of gutta-percha used for condensation should
1. Fit exactly at apex
2. Have a definite apical seal
3. Fit loosely in the canal
4. Be 2 mm from the apex
Endodontics
Answer: 2
In endodontics, the primary goal of using gutta-percha is to achieve a proper seal at the apex of the root canal system. A definite apical seal is crucial to prevent the ingress of bacteria and fluids, which can lead to reinfection. While the cone should fit well within the canal, the emphasis is on achieving a good seal rather than merely fitting exactly at the apex or being 2 mm from it.
Sonic and ultrasonic instruments have in common
1) Used for flaring coronal portion of root-canal
2) Use copious amounts of irrigating solutions
3) Easy to control while operating
4) All of the above
Endodontics
Answer: 2
Both sonic and ultrasonic instruments are used in dental procedures, particularly in endodontics and scaling. They generate vibrations that help in the removal of debris and biofilm. A key feature of these instruments is that they require the use of copious amounts of irrigating solutions to enhance their effectiveness, cool the instrument, and flush out debris. While they may also be used for flaring coronal portions of root canals and can be controlled during operation, the commonality that stands out is the need for irrigating solutions.
Activity of disinfectants is
1) Reduced by organic debris or blood
2) Increased with heat
3) Hastened by adding 5 % oxygen
4) Nullified by ethylene dioxide gas
Endodontics
Answer: 1
Activity of disinfectants is indeed reduced by organic debris or blood. This is because organic materials can act as a barrier, protecting microorganisms from the disinfectant and reducing its effectiveness. The presence of organic matter can bind to the disinfectant, inactivate it, or consume it, thereby reducing its ability to kill or inhibit the growth of microorganisms. For this reason, it is essential to thoroughly clean and debride the area before applying a disinfectant to ensure optimal efficacy.
According to WHO nomenclature of pulp injuries, "avulsion" is classified of pulp injuries as
1. 873.60
2. 873.61
3. 873.68
4. 873.69
Endodontics
Answer: 2
Explanation: In the WHO classification, avulsion refers to the complete
displacement of a tooth from its socket, and it is classified under 873.61. This
classification is crucial for understanding the severity of the injury and
determining the appropriate treatment.