MDS PREP
Formocresol produces tissue fixation and
1. Coagulative necrosis
2. Liquefactive necrosis
3. Cassious necrosis
4. Produces no necrosis
Endodontics
Answer: 1
Formocresol is a commonly used fixative and disinfectant in endodontic
treatment. It is known to produce tissue fixation by causing coagulative
necrosis. This is the process by which the proteins within the tissue are
coagulated or precipitated, leading to the death of cells due to dehydration and
denaturation. The necrotic tissue is then replaced by a fibrous connective
tissue, which is essential for the healing process in the periapical region
following root canal treatment.
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.
Perforation which has poorest prognosis is one that occur at
1) Furcation
2) Apical third
3) Coronal third
4) Middle third of root
Endodontics
Answer: 1
Perforations that occur in the furcation area of multi-rooted teeth have the poorest prognosis due to the complexity of the anatomy and the difficulty in achieving adequate sealing and healing. Furcation involvement often leads to periodontal issues and complicates treatment options, making it more challenging to maintain the tooth.
The X-ray of a traumatized tooth is important because
1. To determine root fracture
2. To assess the stage of root development
3. As basis for future treatment
4. All the above
Endodontics
Answer: 4
Explanation: X-rays are essential in evaluating traumatized teeth for multiple
reasons, including detecting root fractures, assessing root development, and
planning future treatment. This comprehensive view aids in effective management
of dental trauma.
Enlargement of the calcified canals is done with
1. EDTA
2. Calcium hydroxide
3. Sodium hypochlorite
4. Sodium chloride
Endodontics
Answer: 1
EDTA (ethylenediaminetetraacetic acid) is a chelating agent commonly used in endodontics to remove the smear layer and facilitate the enlargement of calcified canals. It helps in dissolving inorganic components of the dentin, making it easier to access and clean the root canal system.
The disadvantage of glass bead sterilizer
1) Only small instruments can be sterilized
2) Variable temperature
3) Does not produce effective heat for sterilization
4) All of the above
Endodontics
Answer: 1
Explanation:
One of the main disadvantages of glass bead sterilizers is that they are limited to sterilizing only small instruments due to the size of the sterilization chamber. Larger instruments cannot be effectively sterilized in this type of device.
Perforation which has poorest prognosis is one that occur at
1. Furcation
2. Apical third
3. Coronal third
4. Middle third of root
Endodontics
Answer: 1
Explanation: Furcation perforations occur in the area where the roots of a multi-rooted tooth diverge. These perforations are particularly challenging to manage because they can lead to periodontal disease and loss of attachment in the furcation area. The prognosis is poor due to the difficulty in achieving adequate sealing and maintaining periodontal health in this area, making it more susceptible to infection and further complications.
When pulp cannot be extirpated in narrow canals, which of the following can be used
1. Obtundant
2. Astringent
3. Haemostatic
4. Mummifying agent
Endodontics
Answer: 4
Explanation: A mummifying agent, such as paraformaldehyde,
is used to preserve the pulp in cases where extirpation is challenging. This
approach is often used as part of pulp therapy in certain endodontic treatments.