MDS PREP
Which is most frequently performed to correct a skeletal mandibular retrognathia
1) "C" type osteotomy
2) Horizontal osteotomy of the ramus
3) Oblique subcondylar
4) Sagittal split osteotomy of the ramus
Oral Surgery
Answer: 4
Skeletal mandibular retrognathia, characterized by a backward positioning of the mandible relative to the maxilla, is commonly corrected using a sagittal split osteotomy (SSO) of the ramus. This surgical procedure involves making a cut in the ramus of the mandible, allowing the surgeon to reposition the mandible forward. The SSO is favored because it provides good access, allows for significant advancement of the mandible, and has a relatively low complication rate. Other options, such as "C" type osteotomy or horizontal osteotomy of the ramus, are less commonly performed for this specific condition.
Rapid onset of action seen by local anaesthesia in small nerve endings is due to
1. Increased threshold of small nerves due to depolarization
2. Low pH of small nerve fibres
3. High ratio of surface area to the volume of small nerve fibres
4. None of the above
Oral Surgery
Answer: 3
Rapid onset of action seen by local anaesthesia in small nerve endings is due to the high ratio of surface area to the volume of small nerve fibres.
The direction of the bevel of the chisel during bone cutting is
1. Away from the bone to be sacrificed
2. Towards the bone to be sacrificed
3. Independent of the bone to be sacrificed
4. Parallel to stress lines
Oral Surgery
Answer: 2
The direction of the bevel of the chisel during bone cutting is towards the bone to be sacrificed.
The tips of anatomic forceps should be placed
1. On the crown portion
2. At the junction of clinical and anatomical crowns
3. Near junction of apical and middle thirds of clinical crown
4. On the root surface as far apically as possible
Oral Surgery
Answer: 4
The tips of anatomic forceps should be placed on the root surface as far apically as possible.
Which of the following is preferred local anaesthetic technique for haemophilics
1. Nerve block
2. Supraperiosteal
3. Intraligamentary
4. Field block
Oral Surgery
Answer: 3
Intraligamentary anaesthesia is the preferred local anaesthetic technique for haemophilics.
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.
In children jaw fractures are normally immobilized for
1. 3 months
2. 6-8 weeks
3. 3-4 weeks
4. 5-10 days
Oral Surgery
Answer: 3
In children, the healing process for fractures is faster due to the high vascularity and rapid bone turnover in growing tissues. Mandibular fractures in children are typically immobilized for a shorter duration compared to adults, as prolonged immobilization can interfere with the growth of the jaw. Immobilization for 3-4 weeks is generally sufficient to allow proper healing without compromising growth.
Local anaesthetic cartridges contain small bubbles. These bubbles contain
1. Oxygen gas
2. Carbon dioxide gas
3. Nitrogen gas
4. Carbon monoxide gas
Oral Surgery
Answer: 3
Local anaesthetic cartridges contain small bubbles of nitrogen gas.