MDS PREP
In a 19-years-old patient with a swelling over the left angle of the mandible, temperature of 38 degree celcius and negative history of trauma, one should suspect
1) Spontaneous fracture of the mandible
2) Pericoronal infection
3) Mumps
4) Sjorgen"s syndrome
Oral Surgery
Answer: 2
Explanation:In this scenario, the presence of swelling and fever in a young adult, particularly in the area of the mandible, suggests a pericoronal infection, which is often associated with the eruption of third molars (wisdom teeth). The lack of trauma further supports this diagnosis, as pericoronal infections are common in the absence of direct injury.
To perform tracheostomy entry should be made at the
1) Cricothyroid ligament
2) Thyroid membrane
3) Thyroid notch
4) Cricoid cartilage
Oral Surgery
Answer: 1
A tracheostomy is a surgical procedure that involves creating an opening in
the trachea (windpipe) to facilitate breathing. The preferred site for making
the incision during a tracheostomy is the cricothyroid ligament,
which is located between the cricoid and thyroid cartilages.
Cricothyroid ligament: This ligament is relatively
superficial and provides a safe access point to the airway, especially in
emergency situations. It is often chosen for emergency tracheostomy because
it is easier to locate and access quickly.
Pericoronitis is seen in relation to
1) Impacted third molars only
2) Around incompletely erupted crown
3) Completely erupted crowns only
4) None of the above
Oral Surgery
Answer: 2
Pericoronitis is an inflammation of the soft tissue surrounding the crown of an incompletely erupted tooth, commonly seen around the third molars (wisdom teeth) but can also occur with other teeth. The condition arises when food particles, bacteria, and plaque accumulate around the partially erupted molar, leading to localized infection.
Thus, pericoronitis is most commonly associated with teeth that are not fully erupted
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.
Biopsy specimens removed for examinations are immediately placed in
1) 10 % ethanol
2) 10 % formalin
3) Hydrogen peroxide
4) 1 % formalin
Oral Surgery
Answer: 2
Formalin, specifically 10% neutral buffered formalin, is the standard fixative used for preserving biopsy specimens. It helps to maintain the tissue architecture and cellular details, making it suitable for histopathological examination. Ethanol is not typically used for routine tissue fixation as it can cause tissue shrinkage and distortion. Hydrogen peroxide is not a fixative and is used for different purposes, such as disinfection. A 1% formalin solution is too dilute for effective fixation.
Which of the following should be included in the preoperative orders?
1. NPO from midnight
2. Take written informed consent
3. Void on call to the OR
4. All of the above
Oral Surgery
Answer: 4
Which of the following should be included in the preoperative orders: All of the above.
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.
Most commonly used local anaesthesia
1. 1: 20,000 xylocaine HCL
2. 1: 50,000 xylocaine HCL
3. 1: 10,000 xylocaine HCL
4. 1: 80,000 xylocaine HCL
Oral Surgery
Answer: 4
Most commonly used local anaesthesia is 1: 80,000 xylocaine HCL.