MDS PREP
The amount of rate of distraction in osteogenesis distraction surgeries
1) 1mm/day
2) 2.5 mm/day
3) 5 mm/day
4) 10 mm/day
Oral Surgery
Answer: 1
The rate of distraction in osteogenesis distraction surgeries is typically 1 mm/day, allowing for gradual bone formation.
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.
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.
A patient is allergic to PABA. Most probably he will also be allergic to
1. Lignocaine
2. Carbocaine
3. Prilocaine
4. Tetracaine
Oral Surgery
Answer: 4
A patient allergic to PABA will most probably also be allergic to Tetracaine.
Xylocaine strength used in dentistry is
1. 2 %
2. 5 %
3. 8 %
4. 10 %
Oral Surgery
Answer: 1
Xylocaine strength used in dentistry is 2%.
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 block (IANB) is a common technique used in dentistry to anesthetize the mandibular teeth, including the molars. The nerve exits the mandibular foramen and runs along the mandibular canal before it branches into the incisive and mental nerves. For effective anesthesia, the injection site is typically located between the first and second premolars, aiming towards the medial surface of the ramus of the mandible, and the needle is inserted until it is just inferior to the root apices of these teeth. This position allows the anesthetic solution to reach the nerve as it emerges from the bone and before it gives off its major branches, thus achieving profound anesthesia for the procedure.
According to gate control theory of pain, large fiber impulses tend to
1. Bypass the central control process
2. Inhibit the effect of painful stimuli transmitted by small fibers
3. Both the above
4. None of the above
Oral Surgery
Answer: 2
According to gate control theory of pain, large fiber impulses tend to inhibit the effect of painful stimuli transmitted by small fibers.
The primary airway hazard for an unconscious patient in a supine position is
1) Tongue obstruction
2) Bronchospasm
3) Laryngospasm
4) Aspiration
Oral Surgery
Answer: 1
In an unconscious patient lying supine, the tongue can fall back and obstruct
the airway due to loss of muscle tone. This is the most common airway hazard in
this position.