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5—The Syringe
22. ANS: a a. Correct. The gauge of the needle affects the ability to aspirate successfully. b. The ability to aspirate blood is largely influenced by the gauge of the needle, not the patient’s blood type. c. The ability to aspirate blood is largely influenced by the gauge of the needle, not the weight of the syringe. d. The ability to aspirate blood is largely influenced by the gauge of the needle, not the type of local anesthetic. REF: p. 80 23. ANS: c a. The Wand is lightweight, maximizing tactile sensitivity. b. Safety syringes are lightweight, maximizing tactile sensitivity. c. Correct. The weight of a metallic syringe minimizes tactile sensitivity. d. Disposable syringes are lightweight, maximizing tactile sensitivity. REF: p. 79, Box 5-2; p. 83, Box 5-7, Box 5-8 24. ANS: c a. Self-aspirating syringes use the rubber diaphragm in the anesthetic cartridge, not mechanical pressure. b. Self-aspirating syringes use the rubber diaphragm in the anesthetic cartridge, not dynamic pressure-sensing technology. c. Correct. Self-aspirating syringes use the rubber diaphragm in the anesthetic cartridge to elicit multiple aspirations during the delivery of local anesthetic. d. Self-aspirating syringes use the rubber diaphragm in the anesthetic cartridge, not the rubber stopper. REF: p. 80 25. ANS: a a. Correct. Cost is a prohibitive disadvantage associated with the pressure syringe. b. First generation pressure syringes had an intimidating appearance, but modern-day versions are smaller and less concerning; the greatest disadvantage is cost. c. Tissue damage is linked to the jet injector, rather than the pressure syringe. d. Difficult aspiration is a disadvantage of the disposable, not pressure, syringe. REF: p. 81