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.
Which of the following local anaesthetics is a vasoconstrictor
1. Lidocaine
2. Procaine
3. Bupivacaine
4. Ropivacaine
Oral Surgery
Answer: 4
Ropivacaine is a vasoconstrictor.
It is difficult to obtain local infiltration anaesthesia in the presence of inflammation/infection because of
1. A decreased pH
2. Increased vascularity
3. Oedema
4. Pain
Oral Surgery
Answer: 1
It is difficult to obtain local infiltration anaesthesia in the presence of inflammation/infection because of a decreased pH.
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.
The role of sodium metabisulfite in local anaesthetic agent is
1. Preservative
2. Fungicide
3. Reducing agent
4. Vasoconstrictor
Oral Surgery
Answer: 2
The role of sodium metabisulfite in local anaesthetic agent is as a preservative.
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.
Each cartridge contains how many ml of anaesthetic solution
1. 0.9 mL
2. 1.2 mL
3. 1.8 mL
4. 2.2 mL
Oral Surgery
Answer: 3
Each cartridge contains 1.8 mL of anaesthetic solution.
Among the following which is advantage of sagittal split osteotomy over transoral vertical subcondylar osteotomy
1) Greater mandibular movement is achieved
2) Because it is intraoral procedure. No external scar is produced
3) Alone may be used to correct a mandibular retrognathism and prognathism
4) Less chance of injuring the inferior dental canal
Oral Surgery
Answer: 3
Among the given choices, the advantage of a sagittal split osteotomy over a transoral vertical subcondylar osteotomy is that it allows for greater mandibular movement. The sagittal split osteotomy is a surgical technique used in orthognathic surgery to reposition the mandible in cases of severe skeletal discrepancies. It involves splitting the mandible along the midline and moving the two halves apart, which can provide significant advancement or setback of the lower jaw. This technique may be used to correct both mandibular prognathism and retrognathism, making it a versatile option in orthognathic surgery. Additionally, it is associated with fewer complications compared to the transoral vertical subcondylar osteotomy, which involves cutting through the medullary bone of the condyle and can pose a higher risk of injury to the facial nerve and other vital structures. However, it's important to note that the choice of surgical approach is determined by the specific case and the individual patient's needs.