MDS PREP
Sensitivity to local anaesthetics is greater in
1. Type B fibres
2. Type C fibres
3. Type A delta fibres
4. Fibres supplying the muscle spindles
Oral Surgery
Answer: 2
Type C fibers, which are unmyelinated and smaller in diameter, are more sensitive to local anesthetics compared to other types of nerve fibers.
Rongeur is commonly used to
1. Cut the bone
2. Extract third molars
3. Place the sutures in the areas where access is limited
4. None of the above
Oral Surgery
Answer: 1
Rongeur is commonly used to cut the bone.
Double contrast phase contrast arthroscopy is used to study
1. Clicking of TMJ
2. Deviation of TMJ
3. Joint space
4. Disc
Oral Surgery
Answer: 3
Double contrast phase contrast arthroscopy is used to study the joint space.
Inferior alveolar nerve block is absolutely contraindicated in patients suffering from one of the following diseases
1. Thrombocytopenia
2. Haemophilia
3. Hypoprothrombinaemia
4. Von Willebrand"s disease
Inferior alveolar nerve block is absolutely contraindicated in patients suffering from haemophilia.
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.
The following factors play a role and cause variations in susceptibility of sensory nerve fibers to local anaesthesia
1. Diameter of the nerve fiber
2. Distance between nodes of Ranvier
3. Length of nerve fiber
4. All of the above
Oral Surgery
Answer: 4
The following factors play a role and cause variations in susceptibility of sensory nerve fibers to local anaesthesia: diameter of the nerve fiber, distance between nodes of Ranvier, and length of nerve fiber.
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.
"Ash forceps" is commonly used for
1. Extraction of lower incisor
2. Extraction of upper canines
3. Holding tissues prior to biopsy
4. Holding vascular areas during surgery
Ash forceps are commonly used for extraction of lower incisor.