MDS PREP
Which condensation of gutta-percha, tip of the instrument is broken at apical third of canal. You would like to
1. Dissolve gutta-percha and retrieve the broken piece
2. Obturate remaining canal up to the point of obstruction, and observation
3. Do periapical surgery and apicectomy to remove broken piece
4. All of the above
Endodontics
Answer: 2
Finally, if the tip of the gutta-percha condensation instrument breaks in the
apical third of the root canal, the most common practice is to simply continue
with the obturation up to the point of obstruction. Attempting to dissolve the
gutta-percha or performing surgery to retrieve the broken piece may not be
necessary and can potentially cause further damage. Instead, the area is sealed,
and the body's natural healing processes are allowed to occur.
While combining NaOCH and H2O2 as irrigants
1) H2O2 should be used last
2) NaOCH should be used last
3) First irrigation should be done by normal saline
4) NaOCH and H2O2 should never be used simultaneously
Endodontics Answer: 2
Because residual H2O2 might react with debris and produce gas that can cause continuous pain.
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
Endodontics
Answer: 4
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.
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.
Most frequent failures of root canal treated cases are due to
1. Inadequate obturation
2. Improper sterilization
3. Improper preparation
4. All of the above
Endodontics
Answer: 1
The most frequent failures of root canal treated cases are often due to
inadequate obturation. This can occur when the root canal filling material does
not completely fill the space or when it is not properly compacted, leaving gaps
where bacteria can persist and cause reinfection. Proper preparation and
sterilization are also crucial, but inadequate obturation is the most common
technical error leading to treatment failure.
In class III Ellis fracture
1. Only enamel is involved
2. Enamel and dentin are involved
3. Enamel,dentin and pulp are involved
4. Non-vital pulp
Endodontics
Answer: 3
Class III: Enamel-Dentin-Pulp Fracture
Description: Involves enamel, dentin, and exposes
the pulp.
Endodontic Consideration: This type of fracture
typically requires endodontic treatment (root canal therapy) to manage
the exposed pulp and prevent infection. The prognosis depends on the
extent of the fracture and the vitality of the pulp.
Gutta-percha cones should not be used for root canal filling in
1. Primary teeth
2. Permanent mandibular last molars
3. Teeth with wide root canal
4. Teeth with curved roots
Endodontics
Answer: 1
Gutta-percha cones are generally not recommended for root canal filling in
primary teeth because the root canals of primary teeth are more likely to
contain vital tissue, and the material can potentially cause harm to these
tissues. However, they are suitable for permanent teeth with wide root canals
and even those with curved roots, provided that the root canals are properly
cleaned and shaped to allow for optimal filling.
There is a real relationship between the incidence of fractured anterior teeth and the
1) Caries in those teeth
2) Hardness of the enamel
3) Hardness of the dentin
4) Protrusion of those teeth
Endodontics
Answer: 4
The protrusion of anterior teeth can increase the risk of fractures due to their position and exposure to occlusal forces. Protruded teeth are more susceptible to trauma and stress during biting and chewing, which can lead to fractures. Additionally, protruded teeth may not have adequate support from adjacent teeth, further increasing their vulnerability to fracture.