MDS PREP
A high level fracture that extends across the orbits through the base of the nose and the ethmoid bone to the zygomatic arches is termed
1. Le Fort I fracture
2. horizontal fracture
3. pyramidal fracture
4. Le Fort Ill fracture
Oral Surgery
Answer: 4
Le Fort III fractures are characterized by a fracture pattern that involves the separation of the facial skeleton from the cranial base. This type of fracture typically extends across the orbits and involves the zygomatic arches, leading to significant facial disfigurement and potential complications.
The elevator can be used to advantage when
1. The tooth to be extracted is isolated
2. The interdental bone is used as a fulcrum
3. The adjacent tooth is not to be extracted
4. Multiple adjacent teeth are to be extracted
Oral Surgery
Answer: 4
The elevator can be used to advantage in scenarios where multiple adjacent teeth
are to be extracted, as it provides a more precise and controlled method of
elevating the teeth, especially when they are closely spaced or have converging
roots.
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
Open reduction and internal fixation of fracture fragments in the older patients is risky because
1) Of their old age, they less likely tolerate the major procedure under general anaesthesia
2) Fixation is difficult because bone will become more dense as age advances
3) Both of the above are correct
4) None of the above are correct
Oral Surgery
Answer: 4
The risk associated with open reduction and internal fixation (ORIF) in older patients is not solely due to their age or increased bone density. It's important to consider their overall health, including potential comorbidities and reduced healing capacity. The risks might be higher due to factors like poor bone quality, increased surgical time, and the potential for complications such as infection and nonunion.
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.
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.
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.
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.