Wreb practice exam 1 LA fully solved graded A+ 2023/2024

Wreb practice exam 1 LA **Which of the following local anesthetic blocks uses pressure anesthesia of the tissues to reduce pt discomfort? A. Infraorbital block B. Inferior alveolar block C. Buccal block D. Greater palatine block - correct answer D. Greater palatine block Esters have a shorter half-life than amides due to which of the following? A. Amides are broke down into the liver B. Esters are broken down in the blood plasma C. Esters are eliminated from the body via the kidneys D. Amides are eliminated from the body via the kidneys - correct answer Ccc ** In the dissociation of local anesthetics, diffusion of the LA occurs best in which of the following situations? A. When there are more free base molecules available B. When the pH is lower in the tissues C. When there are more cations available D. When the pH is neutral - correct answer Cccc Which is true of most nitrous oxide and oxygen office systems? A. The tidal volume refers to the % of nitrous oxide that it takes for the pt to feel relaxed B. The scavenger system is hooked up to the saliva ejector C. When the nitrous oxide runs out the oxygen flow stops D. When the oxygen runs out the nitrous oxide flow stops - correct answer Allergic reactions are which of the following? A. Dose related B. Always depend on previous encounters of allergens C. Not dose related - correct answer The amount of local anesthetic in ml of 4% Articaine HCL. 1:100,000 epi is which of the following? A. 4mg B. 40mg C. 54mg D. 72mg - correct answer You are anesthetizing half of the mouth. You have given an IA no and Buccal no. When you penetrate to give a PSA no, the patient complains of discomfort. You do not feel bone resistance but some resistance penetrating and removing the needle. what might you do to eliminate this discomfort when giving the MSA? A. Penetrate more slowly B. Change the needle C. Align the bevel with the bone D. Give more anesthetic - correct answer When giving the PSA no, trismus can be caused by penetrating which of the following muscles? A. Buccinator B. Lateral palpebral C. Lateral Pterygoid D. Medial Pterygoid - correct answer Epinephrine in the local anesthetics .5% Bupivaciane HCL (Marcaine) is used in a concentration of? A. 2:20,000 B. 1:100,000 C. 1:200,000 - correct answer