MDS PREP
How many mg of 2% lidocaine present in the cartidge?
1. 36 mg
2. 18 mg
3. 180 mg
4. 360 mg
Oral Surgery
Answer: 1
How many mg of 2% lidocaine present in the cartridge is 36 mg.
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 block (IANB) is a common technique used in dentistry to anesthetize the mandibular teeth, including the molars. The nerve exits the mandibular foramen and runs along the mandibular canal before it branches into the incisive and mental nerves. For effective anesthesia, the injection site is typically located between the first and second premolars, aiming towards the medial surface of the ramus of the mandible, and the needle is inserted until it is just inferior to the root apices of these teeth. This position allows the anesthetic solution to reach the nerve as it emerges from the bone and before it gives off its major branches, thus achieving profound anesthesia for the procedure.
In Le Fort I fracture, the fracture fragment includes all of the following except the
1. Bridge of the nose
2. Nasal spine
3. Lower portions of the pterygoid processes
4. Upper teeth and palate
Oral Surgery
Answer: 1
Le Fort I Fracture
Le Fort I fracture involves the maxilla and typically
includes the upper teeth and palate, lower portions of the pterygoid
processes, and the nasal spine. However, it does not involve the bridge of
the nose, which is part of the facial skeleton above the maxilla.
The following anatomical landmarks are useful in the closed mouth approach of mandubular nerve block except
1. Occlusal plane of occluding teeth
2. Anterior border of ramus
3. Mucogingival junction of the mandibular teeth
4. A & B
Oral Surgery
Answer: 3
The closed mouth approach of mandibular nerve block relies on the anatomical
landmarks of the occlusal plane of occluding teeth and the anterior border of
the ramus. The mucogingival junction is not a relevant landmark for this
technique.
The primary airway hazard for an unconscious patient in a supine position is
1) Tongue obstruction
2) Bronchospasm
3) Laryngospasm
4) Aspiration
Oral Surgery
Answer: 1
In an unconscious patient lying supine, the tongue can fall back and obstruct
the airway due to loss of muscle tone. This is the most common airway hazard in
this position.
Maximum recommended dosage of lignocaine with 1:1,00,000 adrenaline subcutaneously is
1. 100 mg
2. 30 mg
3. 500 mg
4. 700 mg
Maximum recommended dosage of lignocaine with 1:1,00,000 adrenaline subcutaneously is 100 mg.
For extraction of mandibular molar, anaesthesia is given to act on
1. Inferior alveolar nerve
2. Buccal nerve
3. Lingual nerve
4. Masseteric nerve
Oral Surgery
Answer: 1
For extraction of mandibular molar, anaesthesia is given to act on the inferior alveolar nerve.
Toxic dosage of lignocaine with adrenaline is
1. 5 mg/kg body weight
2. 10 mg/kg body weight
3. 15 mg/kg body weight
4. 20 mg/kg body weight
Oral Surgery
Answer: 1
Toxic dosage of lignocaine with adrenaline is 5 mg/kg body weight.