Lecture 16: # 📑 Local Anesthesia – Lecture 16 (All MCQs) ### Q1… — اسئلة من مصادر بغداد (م3 طب اسنان) محاضرات جامعه الكنوز — TG.ME

Lecture 16: # 📑 Local Anesthesia – Lecture 16 (All MCQs) ### Q1: According to local anesthesia principles, which technique is specifically indicated for dental procedures located in the posterior portion of the mandible? A) Infiltration anesthesia B) Topical anesthesia C) Regional block anesthesia D) Ethyl chloride spray ### Q2: Based on the clinical preparations of topical anesthesia, which agent provides the fastest onset of action (1 minute) with an anesthetic duration of approximately 10 minutes? A) Lidocaine Ointment 5% B) Lidocaine Spray 10% or 15% C) Ethyl chloride refrigeration spray D) Infiltration solution with 25-gauge needle ### Q3: Topical or surface anesthesia is capable of anesthetizing small terminal nerves up to what specific depth? A) About 2 mm B) Exactly 25 mm C) Up to 5 mm D) Underneath the cortical plate ### Q4: What anatomical feature makes the maxilla significantly more favorable for infiltration anesthesia compared to the posterior region of the mandible? A) The maxilla has a completely dense cortical plate with zero porosity. B) The maxilla has a thin labial/buccal cortical plate and shows sites of porosity. C) The maxilla lacks terminal nerve fibers entirely. D) The maxilla requires a 45-degree angle needle with a gauge of 50. ### Q5: When performing the infiltration technique, the needle should be inserted at a 45-degree angle to the long axis of the tooth, and the bevel of the needle must be: A) Facing away from the bone B) Facing the bone C) Inserted too superficially into the intact skin D) Locked tightly inside the regional nerve block slot ### Q6: To avoid tissue injury that results in immediate pain or persistent post-injection pain during infiltration, a dentist should avoid all the following practices EXCEPT: A) Injecting the solution too rapidly. B) Injecting too large a volume of the local anesthetic solution. C) Injecting the solution too superficially. D) Facing the bevel of the needle toward the bone. ### Q7: Why is the "Sub-mucous injection" technique considered inadequate for routine tooth extractions? A) Because it causes severe and immediate hematoma formation. B) Because the solution is deposited between the periosteum and cortical plate. C) Because it is unlikely to produce anesthesia of the dental pulp. D) Because it requires opening the patient's mouth fully to reach the pterygoid space. ### Q8: Which infiltration technique is highly painful due to the firm attachment of the tissue to the underlying cortical bone? A) Supra-periosteal injection B) Sub-periosteal injection C) Sub-mucous injection D) Regional block anesthesia ### Q9: When performing a Posterior Superior Alveolar (PSA) nerve block, the needle should be inserted into the height of the mucobuccal fold opposite to which specific anatomical site? A) The mesial surface of the maxillary first premolar. B) The midline of the hard palate about 1 cm posterior to central incisors. C) The distal surface of the maxillary second molar. D) The incisive foramen under a 45-degree angle. ### Q10: During a PSA nerve block injection, the needle must be advanced in which specific combination of directions? A) Downward, outward, and forward direction. B) Upward, inward, and backward direction. C) Horizontally along the palatal midline. D) Directly perpendicular into the core of the sphenomandibular ligament. ### Q11: What is considered one of the major disadvantages and risks associated with performing a Posterior Superior Alveolar (PSA) nerve block? A) Damage to the facial nerve causing immediate paralysis. B) Burnishing and crushing of the maxillary tuberosity.