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Chairside Assisting for Dental Assisting Exam Practice Problems (page 2)

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Updated on Jun 23, 2011

Practice Answers and Explanations

1. c. The operating zone for a right-handed dentist, according to the clock concept, is 7–12.

2. c. The assistant’s zone for assisting a right-handed operator, according to the clock concept, is 2–4.

3. b. The operator has two hands, and the assistant has two hands. Therefore, it is termed four-handed dentistry.

4. d. Modified pen and thumb-to-nose are the two possible grasps utilized by the assistant for the HVE.

5. d. The assistant must be seated 4–6 inches higher than the operator to establish visibility.

6. d. Supine position is when a patient is lying back and his or her body is parallel to the floor.

7. b. Gel-form topical anesthetic is the most common and popular way to administer topical anesthetic to a patient.

8. d. A block injection is given distal of the retromolar pad in the area where the long buccal nerve, the lingual nerve, and the inferior alveolar nerve intersect. This intersection is called the trigeminal nerve.

9. b. An infiltration injection is always administered on the maxillary arch due to the numerous nerves that surround the roots of every tooth.

10. c. Needles of any kind are always disposed of in the impervious red sharps container, per OSHA regulations.

11. e. A vasoconstrictor is an ingredient present in local anesthetic that causes the blood vessels to constrict and lessen the blood flow, as well as increase the working time or duration of the local anesthetic.

12. c. Parasthesia is a side effect of local anesthetic caused by the anesthetic needle injuring the nerve during administration of the local anesthetic. Depending on the severity of the injury to the nerve, it can cause varying degrees of numbness to the patient’s face.

13. c. Nitrous-oxide gas is a mixture of oxygen and nitrogen.

14. b. Oxygen tanks are always colored green.

15. a. Nitrous-oxide tanks are always colored blue.

16. a. A nose mask is placed over the patient’s nose. The patient is instructed to breathe deeply through the nose. Therefore, this analgesic is administered via inhalation.

17. d. The anchor tooth, also known as the clamped tooth, requires the largest hole punched in the rubber dam material in order to stretch over the clamp and prevent moisture leakage.

18. d. In endodontics, the focus is on one particular tooth. Due to the use of certain endodontic medicaments, it is best to utilize single-tooth isolation with the rubber dam.

19. d. According to manufacturers’ recommendations, 6 x 6 size rubber dam material is best used for posterior isolation. For anterior isolation, 5 x 5 rubber dam material is best.

20. c. Rubber dam hole size 3 is the recommended hole size to be punched for a premolar/bicuspid.

21. d. Crown and bridge scissors are used to cut the interdental septum of the rubber dam material, cutting away from the gingival tissue to avoid injury to the patient.

22. c. In standard restorative procedures, it is customary to expose the entire quadrant of teeth (6–8) when placing a rubber dam.

23. a. The normal resting pulse rate for an adult is 60–100 beats per minute.

24. b. The systolic reading is always the higher number, which is the heart muscle taking in oxygenated blood (e.g., systolic/diastolic or 120/80).

25. b. The portable unit is located on the assistant’s side of the chair and consists of the HVE, saliva ejector, and air/water syringe.

26. a. Black’s Cavity Classifications help dental personnel specify locations of decay. Class I refers to decay that is located on the occlusal surfaces of posterior teeth.

27. d. Class IV refers to decay located along the interproximal involving the incisal edges of anterior teeth. This is another of Black’s Cavity Classifications.

28. c. The high-speed hand piece rotates at 470,000 rotations per minute (RPM), which causes extreme heat on a tooth. This is the only hand piece that sprays water.

29. c. To avoid injury to the pulp, a cool water spray is emitted from the high-speed hand piece, which prohibits the tooth from overheating and killing the pulp.

30. e. The rheostat, or foot pedal, is the control for the dental hand pieces. The hand pieces will not function unless the rheostat is activated.

31. e. The HVE is beneficial in many areas of the oral cavity. It provides additional light into the oral cavity via retraction of the tongue and soft tissues while keeping the area free of debris. However, the HVE will not eliminate the need for or use of the rubber dam.

32. d. A discoid-cleoid is a carver, not a hand-cutting instrument. A carver carves freshly placed amalgam, while a hand-cutting instrument cuts tooth structure manually.

33. e. A mouth mirror is used for reflecting light, retracting the cheek and tongue, and providing indirect vision for the operator.

34. c. When taking an alginate impression of the maxillary arch, a patient should be seated in the upright position, with his or her head tilted slightly forward to avoid possible gagging on the alginate material.

35. a. The use of a clear plastic mylar strip as a matrix for composite placement is preferred to allow the curing light to penetrate and cure the material. The use of the other choices given would prohibit the adequate curing of the material.

36. a. Extrinsic stains are stains that occur on the external surfaces of the tooth and can be removed via various dental procedures, such as home bleaching.

37. b. Articulating paper is utilized to ensure the operator has restored the patient’s bite properly following the placement of a restoration. Therefore, articulating paper will leave colored marks on any high spots on the new restoration.

38. a. The inner knob of the Tofflemire retainer is used to secure the band tightly within the retainer. The outer knob is used to adjust the size of the band once it is placed over the tooth.

39. a. There are three portions to a bur. The shank is the portion that fits into the hand piece and can be friction grip or latch type. The neck is the portion that connects the shank to the head of the bur. The head is the actual cutting portion of the bur.

40. e. Burs are supplied in carbide metal or diamond. Carbide metal is used for cutting restorations and removing decay. Diamond burs are used for gross reduction of enamel in procedures such as crown and bridge. Both types are supplied in either friction grip or latch type, depending on the hand piece being used.

41. a. A lesion is a generalized term used in dentistry to describe any abnormality in the oral cavity.

42. c. A ronguers is used to trim and contour the alveolar bone exclusively. It is often used in surgical settings, such as periodontal or oral surgeries.

43. c. Alveolitis, or dry socket, is an infection of the alveolar bone that became exposed to bacteria in the mouth after the blood clot covering the bone post-extraction was dislodged.

44. d. Pediatric dental patients with physical or mental complications can be treated successfully at either the private pedodontic office or using an operating room with hospital privileges, depending upon the severity of the patient’s disorder.

45. b. Traumatic intrusion is the forcing of the permanent or primary tooth back into the socket. This usually occurs accidentally with small children; however, it can also happen to any patient involved in a traumatic accident.

46. b. Class II malocclusion is referred to as buck tooth appearance or a distoclusion. The maxillary teeth appear more mesial than the mandibular. The tongue is a very strong muscle that can push the teeth into this position.

47. b. The ultrasonic scaler is a fast and effective way of removing excess cements from supragingival surfaces. It is also used by hygienists to remove calculus from all surfaces of a patient’s tooth.

48. b. Class II mobility indicates moderate mobility while perio charting. Class I is slight mobility, Class III is advanced mobility, and Class IV is severe mobility. These classes are indicators of periodontal disease.

49. a. Reversible pulpitis is a condition in which the pulp can heal itself, or the dentist may be able to place a medicament to encourage the pulp to heal. An endodontic procedure is not indicated at this point due to the possibility of the reversal of the inflammation.

50. c. Sodium hypochlorite is a mixture of bleach and water. Irrigation of the canals is indicated to help kill any remaining infection that may be present in the root canals.

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