Local Anesthesia - Final WREB (w N2O) 2023/2024 passed

Local Anesthesia - Final WREB (w N2O)Different methods of anesthesia, historically - correct answer Refrigeration, compression, hypnosis, electricity, acupuncture, pharmacologic agents Types of syringes - correct answer Sterilizable, safety (single use), needle-less (air jet injector), computer controlled, disposable plastic Types of breech (side) loading syringes - correct answer Aspirating (what we have), self-aspirating Components of a syringe: needle adapter - correct answer *A in image* Components of a syringe: barrel - correct answer *B in image* Components of a syringe: harpoon - correct answer *C in image* Components of a syringe: piston - correct answer *D in image* Components of a syringe: Guide bearing - correct answer *E in image* Components of a syringe: spring - correct answer *F in image* Components of a syringe: finger rest - correct answer *G in image* Components of a syringe: thumb ring - correct answer *H in image* Function of local anesthetic drug in a cartridge of LA - correct answer Propagate nerve impulse Function of vasopressor drug in a cartridge of LA - correct answer Increase duration, decrease acidity/toxicity Function of preservative in a cartridge of LA - correct answer Prevent biodegradation of vasopressor by oxygen (antioxidant) Function of sodium chloride in a cartridge of LA - correct answer Makes solution more isotonic w/ body Function of distilled water in a cartridge of LA - correct answer Dilution What is the most common preservative used in LA cartridges? - correct answer Sodium bisulfite How much solution is contained in dental anesthetic cartridges manufactured in the US? - correct answer 1.8ml (cc) How much solution is "one plunger's worth" of a cartridge? - correct answer 0.2ml (cc) What does it mean if there are bubbles in an LA cartridge? - correct answer There is nitrogen in the cartridge. (1-2mm = okay, larger = do not use) What does it mean if leakage occurs during injection? - correct answer The needle punctured the diaphragm off center What does it mean if an LA cartridge has an extruded stopper? - correct answer It may have been stored in a chemical disinfectant. Do not use. What should you do if you find a cracked LA cartridge? - correct answer Check the rest from the shipment (they may have been broken during transportation) What may cause a burning sensation when delivering LA? - correct answer Normal response to pH or vasopressor, cartridge may contain disinfectant, or cartridge may have been overheated