NBDE Examination Practice Question # 112

NBDE Examination.

Practice Question # 112.

 

nbde quiz

 

The most commonly used IANB technique is the Halsted approach or direct technique. The target point for the deposition of the local anesthetic is the inferior alveolar nerve (IAN) before it enters the mandibular foramen. The site of needle penetration is the mucous membrane on the medial side of the mandibular ramus. With the patient placed in a supine or semisupine position, with his mouth wide open, the index finger or thumb should be placed in the coronoid notch.

A horizontal line that extends posteriorly from the fingertip in the coronoid notch to the deepest part of the pterygomandibular raphe should be imagined. This line should be parallel and, in most patients lies 6 to 10 mm above the occlusal plane of the mandibular molars. The needle insertion point lies three-quarters of the anteriorposterior distance from the coronoid notch to the deepest part of the pterygomandibular raphe. The barrel of the syringe should be placed in the contralateral side of the mouth, usually over the premolars , and the needle should be inserted approximately 25mm until bone contact is noted.

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