MDS PREP
D2 on the endodontic file indicates
1) Diameter at tip of instrument
2) Angle of instrument
3) Length of instrument
4) 1/100th mm at end of cutting blade
Endodontics
Answer: 4
The designation "D2" on an endodontic file indicates the diameter of the file at
the tip, measured in hundredths of a millimeter. This helps clinicians select
the appropriate file size for root canal treatment.
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.
Stabilisation of avulses tooth requires
1) 1-2 weeks
2) 2-3 weeks
3) 4-6 weeks
4) More than 6 weeks
Endodontics
Answer: 1
The stabilization of an avulsed tooth typically requires a period of 1-2 weeks. During this time, the tooth is often replanted and stabilized to allow for healing and reattachment of the periodontal ligament.
Endodontic therapy is said to be successful when following changes occur in periapical region
1. Formation of cementum
2. Regeneration of alveolar bone
3. Regeneration of PD ligament
4. All of the above
Endodontics
Answer: 4
When it comes to assessing the success of endodontic therapy, the changes that
occur in the periapical region are crucial indicators. A successful treatment
typically results in the formation of new cementum, regeneration of the alveolar
bone, and regeneration of the periodontal ligament. These processes are all part
of the body's natural healing response to the removal of infection and the
introduction of a biocompatible filling material in the root canal system. Thus,
all of the above factors contribute to the overall success of the treatment.
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.
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.
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.
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.