MDS PREP
One wants to anaesthetise the inferior alveolar nerve at the point at which it exits from the mandibular canal, so the injection site most often located in
1. Between first and second molars inferior to the root apices
2. Between first and second molar superior to root apices
3. Between first and second premolars inferior to root apices
4. Between first and second premolars superior to root apices
Oral Surgery
Answer: 3
The inferior alveolar nerve exits the mandibular foramen and runs in the
mandibular canal before it branches off to supply the teeth, including the
second premolar. To anesthetize the nerve at this point, the injection site is
commonly located between the first and second premolars, inferior to the root
apices, where the nerve is relatively superficial and accessible.
The elevators that employ both the lever and wedge principles during extraction of root tip are
1. Pott"s elevators and apex elevators
2. Apex elevators and straight elevator
3. Straight elevators and Pott"s elevators
4. Pott"s elevators and Cryer elevators
Oral Surgery
Answer: 2
The elevators that employ both the lever and wedge principles during extraction of root tip are apex elevators and straight elevator.
The first sensation to be lost following administration of local anaesthetic is
1. Proprioception
2. Pain
3. Touch
4. Temperature
Oral Surgery
Answer: 2
The first sensation to be lost following administration of local anaesthetic is pain.
Scrub technique refers to a method of scrubbing the
1. Surgical instruments after a contaminated case
2. Patient body surface before placing surgical incison, to decrease bacterial flora
3. Operating room
4. Operator"s hands and forearms before donning gown and gloves
Oral Surgery
Answer: 4
Scrub technique refers to the method of scrubbing the operator's hands and
forearms before donning gown and gloves. This is essential for maintaining a
sterile environment and reducing the risk of surgical site infections.
Of the following in which condition local anaesthesia is ineffective?
1. Oedema
2. Localised infection
3. Haematoma
4. Anaemia
Oral Surgery
Answer: 2
Local anaesthesia is ineffective in localized infection.
Which is the best method to counteract severe acidosis following cardiopulmonary resuscitation?
1) Administration of adrenaline by IV routes
2) Administration of sodium bicorbonate intravenously
3) Administration of adrenaline intramuscularly
4) No treatment is necessary because it is self-limiting
Oral Surgery
Answer: 2
Severe acidosis, particularly metabolic acidosis, can occur following
prolonged cardiac arrest and subsequent CPR. The primary goal in managing such
cases is to restore normal pH levels in the body, which is crucial for proper
cellular function and overall physiological homeostasis.
1. Sodium bicarbonate Sodium bicarbonate is a strong base that reacts with
hydrogen ions (H+), which are responsible for acidity in the blood, to form
carbon dioxide (CO2) and water (H2O). This reaction helps to neutralize the
excess hydrogen ions, thereby raising the pH of the blood. It is administered
intravenously because it allows for rapid distribution throughout the body and
direct access to the circulatory system where it can counteract acidosis most
effectively. The intravenous route ensures that the medication reaches the
bloodstream quickly and in a controlled manner, making it the preferred method
for acute and severe cases.
2. Adrenaline (epinephrine)*: Although adrenaline is a crucial medication used
in CPR for its vasopressor and cardiac stimulant effects, it is not the primary
treatment for severe acidosis. Adrenaline is typically administered to improve
cardiac output and blood pressure during CPR.
Of the following which is most suitable anaesthesia for the extraction of a deciduous molar
1. Inferior alveolar nerve block
2. Surface anaesthesia
3. Local infiltration
4. None of the above
Oral Surgery
Answer: 1
The most suitable anaesthesia for the extraction of a deciduous molar is inferior alveolar nerve block.
Bell’s palsy is associated with
1. inflammation of the maxillary sinus
2. muscles of mastication
3. arthritis of the temporomandibular joint
4. facial nerve
Oral Surgery
Answer: 4
Bell's palsy is a form of temporary facial paralysis or weakness on one side of the face resulting from damage or trapping of the facial nerve (cranial nerve VII), which is the nerve that controls the muscles of facial expression.