MDS PREP
A straight elevator is properly used to advantage when the
1. Adjacent tooth is the fulcrum
2. Tooth is isolated tooth
3. Interdental bone is fulcrum
4. Adjacent tooth is not to be extracted
Oral Surgery
Answer: 3
The straight elevator is properly used to advantage when the interdental bone is
used as a fulcrum. This is because the straight elevator can be inserted into
the periodontal ligament space along the long axis of the tooth, and when
levered against the interdental bone, it helps in lifting the tooth from the
socket. Using the adjacent tooth as a fulcrum can potentially damage it.
Among the following which is the rescule breathing in adult?
1) 6 times/min
2) 18 times/min
3) 12 times/min
4) 24 times/min
Oral Surgery
Answer: 3
The recommended rate for rescue breathing in adults is approximately 12 breaths
per minute. This rate allows for adequate ventilation without causing
hyperventilation.
When comparing to the non-myelinated nerve, myelinated nerve requires
1. Higher concentration of anaesthetic agent
2. Lower concentration of anaesthetic agent
3. Same concentration of anaesthetic agent
4. None of the above because no correlation
Oral Surgery
Answer: 1
When comparing to the non-myelinated nerve, myelinated nerve requires a higher concentration of anaesthetic agent.
The addition of hyaluronidase to a local anaesthetic solution might
1) Increase the duration of anaesthesia
2) Limit the area of anaesthesia
3) Reduce bleeding
4) Enhance diffusion of local anaesthetic
Oral Surgery
Answer: 4
Hyaluronidase is an enzyme that breaks down hyaluronic acid, a component found in the extracellular matrix. When added to a local anesthetic, it increases the permeability of tissues, facilitating enhanced diffusion of the anesthetic agent into the surrounding areas. This can broaden the spread of the anesthetic, allowing for a more effective and comprehensive blockade of nerve signaling.
During the Gillies approach, the structure of anatomic significance is
1. Superficial temporal artery
2. Marginal mandibular nerve
3. Internal jugular vein
4. Inferior alveolar nerve
Oral Surgery
Answer: 1
The Gillies approach is a surgical technique used in facial reconstruction, particularly for the repair of facial defects. The superficial temporal artery is of significant anatomical importance during this procedure, as it supplies blood to the scalp and face. Surgeons must be cautious to avoid damaging this artery during the approach.
Myelinated nerve fibres have all of the following properties except
1. Conduction is slower in myelinated than in non-myelinated fibres
2. Current discharges at nodes of Ranvier
3. Outer layer is of lipids
4. None of the above
Oral Surgery
Answer: 1
Myelinated nerve fibres have all of the following properties except conduction is slower in myelinated than in non-myelinated fibres.
In peripheral nerve block, which of the following local anaesthetics has the longest duration of action?
1. Bupivacaine
2. Cocaine
3. Lignocaine
4. Prilocaine
In peripheral nerve block, the local anaesthetic with the longest duration of action is Bupivacaine.
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.