MDS PREP
Which of the following local anaesthetics is a vasoconstrictor
1. Lidocaine
2. Procaine
3. Bupivacaine
4. Ropivacaine
Oral Surgery
Answer: 4
Ropivacaine is a vasoconstrictor.
In endodontic surgery, which of the following about chromic gut suture is not true
1. Its properties are inferior to plain gut suture
2. It is coated with chromium tri-oxide
3. It is less biocompatible than plain gut suture
4. Its absorption is faster than the plain gut sutures
Oral Surgery
Answer: 4
In endodontic surgery, the statement that chromic gut suture has faster absorption than plain gut sutures is not true.
The following factors play a role and cause variations in susceptibility of sensory nerve fibers to local anaesthesia
1. Diameter of the nerve fiber
2. Distance between nodes of Ranvier
3. Length of nerve fiber
4. All of the above
Oral Surgery
Answer: 4
The following factors play a role and cause variations in susceptibility of sensory nerve fibers to local anaesthesia: diameter of the nerve fiber, distance between nodes of Ranvier, and length of nerve fiber.
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.
Compbell line is seen in
1. Transpharyngeal view
2. Transorbital view
3. Occipitomental view
4. Towne view
Oral Surgery Answer: 3
The Campbell line is an important anatomical reference line
used in radiology, particularly in the context of the occipitomental
view (also known as the Water's view). This line is drawn from the
outer canthus of the eye to the midpoint of the maxillary sinus and is used to
assess the position of the maxillary sinuses and other related structures in the
skull.
Occipitomental view: This view is commonly used in
maxillofacial imaging to visualize the maxillary sinuses, orbits, and nasal
cavity. The Campbell line helps in evaluating the relationship of these
structures.
Transpharyngeal view: This view is used to visualize the
pharynx
Transorbital view: This view focuses on the orbits and
surrounding structures
Towne view: This view is used to visualize the occipital
bone and the base of the skull
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.
Inferior alveolar nerve block is given in
1. Retromolar area
2. Pterygomandibular space
3. Submandibular space
4. Submental space
Oral Surgery
Answer: 2
Inferior alveolar nerve block is given in the pterygomandibular space.
Rongeur is commonly used to
1. Cut the bone
2. Extract third molars
3. Place the sutures in the areas where access is limited
4. None of the above
Oral Surgery
Answer: 1
Rongeur is commonly used to cut the bone.