MDS PREP
Of the following in which condition local anaesthesia is ineffective?
1. Oedema
2. Localised infection
3. Haematoma
4. Anaemia
Oral Surgery
Answer: 2
Local anaesthesia is ineffective in localized infection.
Eburnation is seen in
1) Malunion
2) Nonunion
3) Osteomyelitis
4) Osteoradionecrosis
Oral Surgery
Answer: 2
Eburnation is the process of converting living bone tissue into a sclerotic, or hardened, avascular bone due to lack of blood supply. This can occur at the site of a nonunion, which is where a fracture fails to heal properly, and the bone ends remain separate.
The effect of local anaesthesia can be increased by the addition of
1) Adrenaline
2) Isoprenaline
3) Dopamine
4) Felypressin
Oral Surgery
Answer: 1
Explanation:
Adrenaline (epinephrine) is commonly added to local anesthetics to prolong their effect and reduce bleeding in the area. It works by constricting blood vessels, which decreases the rate of absorption of the anesthetic into the bloodstream, thereby enhancing its duration of action.
Among the following, which condition is a containdictation to the use of local anaesthetic agent?
1. Parkinson"s disease
2. Liver damage
3. Pregnancy
4. Hypersensitivity to the drug
Oral Surgery
Answer: 4
Hypersensitivity to the drug is a contraindication to the use of local anaesthetic agent.
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.
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 exits the mandibular foramen and runs in the
mandibular canal before it branches off to supply the teeth, including the
second premolar. To anesthetize the nerve at this point, the injection site is
commonly located between the first and second premolars, inferior to the root
apices, where the nerve is relatively superficial and accessible.
To luxate a tooth with a forceps the movements should be
1. Firm and deliberate primarily to the facial surface with secondary movements to the lingual surface
2. Sharp and definite so periodontal ligament tears easily
3. Figure of "eight" motion
4. None of the above
Oral Surgery
Answer: 1
To luxate a tooth with forceps, the movements should be firm and deliberate primarily to the facial surface with secondary movements to the lingual surface.
Nerve membrane stabilization action of local anaesthetic agents is due to
1. Increasing conductance of potassium ions
2. Creating negative after potentials
3. Preventing conductance of Na ions from the exterior of the nerve to the intrior
4. None of the above
Oral Surgery
Answer: 3
Nerve membrane stabilization action of local anaesthetic agents is due to preventing conductance of Na ions from the exterior of the nerve to the interior.