Local Anesthesia Board Exam | Actual questions and answers | 100% verified

Local Anesthesia Board Exam | Actual questions and answers | 100% verified What injection numbs the lower lip? - Mental *Foramens & Nerves that enter and exit foramen rotundum, ovale, mandibular, incisive and mental - Foramen rotundum - maxillary division of trigeminal nerve - V5 Foramen ovale - mandibular division of trigeminal nerve - V5 Mandibular - inferior alveolar nerve Incisive - nasopalatine nerve Mental - mental nerve *Incisive papilla & nasopalatine injection - Nerves anesthestized - bilateral nasopalatine Area anesthestized - anterior portion of hard palate from M of right first premolar to M of leftpremolar. No hemostasis except in injection sight. Technique - 27 gauge short needle inserted into palatal mucosa just lateral to incisive papilla, target area is incisive foramen beneath the incisive papilla. Landmarks - incisive papilla and central incisors Approach - 45 degree angle toward incisive papilla Topical Anesthesia - *Benzocaine - ester, not absorbed systemically, penetrates 2-3mm, 6 - 20 %, Lidocaine- amide Other info on topicals - no vasoconstrictors, concentration greater than locals, benzocaine and lidocaine are not soluble in water. *What cause would you expect if a patient had a lesion on lower lip the next day?? - Soft tissue injury - self inflicted trauma to lips and tongue from biting it while anesthetized. *Question on IA injection technique on how far to insert the needle and outcome of a certain scenario? - What would happen if needle inserted to hub Insert 25 gauge long needle 20 -25 mm (3/4 of needle) till you contact bone. If you don't contact bone, you need to retract slightly, reposition angle of syringe more posteriorly and reinsert. *What happens during depolarization? - reverse polarity = *sodium in and potassium out* Local anesthetic ability to decrease the depolarization phase of the action potential What is a free nerve ending? - a receptor nerve ending that is not enclosed in a capsule. A typical free nerve ending consists of a bare axon that may be myelinated or unmyelinated. It is often found in fibrous capsules, ligaments, synovial spaces, may be sensitive to mechanical or biochemical stimuli. *Which of the following best describes Myelinated nerves? - transmits impulses faster *Understand safety precautions for recapping needles? - scoop method is recommended; **never use two hands to recap *How is bevel of needle o