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11—Basic Injection Technique
3. ANS: d a. A barbed needle rarely produces a traumatic, or painful, insertion. b. A barbed needle will exact pain upon withdrawal as the fishhook-type barb tears unanesthetized tissue. c. A barbed needle is notoriously painless, upon insertion, but painful upon withdrawal (atraumatic needle insertion, traumatic needle withdrawal). d. Correct. A barbed needle is identified by atraumatic (painless) needle insertion, but traumatic, (painful) needle withdrawal. REF: p. 157 4. ANS: a a. Correct. Needles with a 23 gauge or larger are associated with increased pain on initial tissue penetration. b. Numerous studies have concluded that patients cannot distinguish between 25-, 27-, and 30-gauge needles; 23-gauge needles are associated with increased pain. c. Numerous studies have concluded that patients cannot distinguish between 25-, 27-, and 30-gauge needles; 23-gauge needles are associated with increased pain. d. Numerous studies have concluded that patients cannot distinguish between 25-, 27- and 30-gauge needles; 23-gauge needles are associated with increased pain. REF: p. 158 5. ANS: a a. Correct. A few drops are expelled once the anesthetic syringe is completely assembled to confirm free flow before reaching the target deposition site. b. A typical dental cartridge contains only 1.8 mL of anesthetic solution; just a few drops of anesthetic need be expelled to confirm free flow. c. Just a few drops of anesthetic need be expelled to confirm free flow; expelling one third a cartridge is unwarranted. d. Just a few drops of anesthetic need be expelled to confirm free flow; expelling one fourth a cartridge is unwarranted. REF: p. 158 6. ANS: c a. The second statement is false; warming the anesthetic cartridge past room temperature does not alleviate the pain associated with injection. There is no clinical reason to warm a cartridge before its administration. b. The first statement is true. Overly warm anesthetic solution elicits pain upon injection. c. Correct. The first statement is true; injecting overly warm local anesthetic is uncomfortable for the patient. The second statement is false; there is no benefit whatsoever associated with warming anesthetic solution past room temperature. d. The first statement is true; the second is false. REF: p. 158
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