MDS PREP
Which of the following procedures is best suited to correct bimaxillary protrusion
1. Extraction of four premolars and anterior alveolar segment repositioning
2. Mandibular body osteotomy and posterior maxillary osteotomy
3. Subcondylar osteotomy
4. None of the above
Oral Surgery
Answer: 1
The best procedure to correct bimaxillary protrusion is extraction of four premolars and anterior alveolar segment repositioning. Bimaxillary protrusion is a condition where both the upper and lower jaws are positioned too far forward. This can be corrected by extracting the four premolars (two from the upper and two from the lower jaw) to create space for the teeth to move backward and then repositioning the anterior alveolar segments (the bone and gum tissue holding the front teeth) to achieve a more favorable facial profile and occlusion. This approach addresses the protrusion of both jaws simultaneously and is more effective than the other options listed, which are more targeted at specific jaw issues (mandibular body osteotomy and subcondylar osteotomy) and not as comprehensive for bimaxillary protrusion cases.
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.
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.
The prime purpose of bibevel chisel is
1. Split teeth
2. Sharpen the angles
3. Remove bone
4. Engage point establishment
Oral Surgery
Answer: 1
The prime purpose of bibevel chisel is to split teeth.
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.
Hilton"s method deals with
1) Decompression of a cyst
2) Drainage of an abscess
3) Biopsy removal
4) Preanaesthetic check-up
Oral Surgery
Answer: 2
Hilton's method is a surgical technique primarily used for the drainage of abscesses. This method involves creating an incision to allow the pus to escape, thereby relieving pressure and promoting healing.
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.
Which of the following would be indicated if one expected a long surgical procedure and a general anaesthetic to be administrated
1. Sodium thiopental iv
2. Vinyl ether, open drop method
3. Intubation with individually selected anaesthetic agent
4. None of the above
Oral Surgery
Answer: 3
If one expects a long surgical procedure and a general anaesthetic to be administered, intubation with individually selected anaesthetic agent is indicated.