Test bank for oral radiology principles and interpretation 6th edition white isbn 10 0323049834 isbn

Test Bank for Oral Radiology Principles and Interpretation, 6th Edition, White, ISBN-10: 032

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White: Oral Radiology, 6th Edition Chapter 9: Intraoral Radiographic Examinations Test Bank Multiple Choice 1) Which of the following intraoral projections should show all of a tooth, including the surrounding bone?

A. Periapical projection B. Bitewing projection C. Occlusal projection D. Panoramic projection ANS: A Periapical radiographs should show all of a tooth, including the surrounding bone. Bitewing radiographs show only the crowns of teeth and the adjacent alveolar crests. Occlusal radiographs show an area of teeth and bone larger than periapical radiographs. The panoramic projection is an extraoral projection.

REF: Page 109 2) A full-mouth set of radiographs consists of _________________ projections.

A. periapical and occlusal B. bitewing and periapical C. occlusal and bitewing D. panoramic and occlusal ANS: B A full-mouth set of radiographs consists of bitewing and periapical projections. These projections, when well exposed and properly processed, can provide considerable diagnostic information to complement the clinical examination.

REF: Page 109 3) The full length of the root and at least __ mm of periapical bone must be visible on an intraoral periapical radiograph.

A. 0.5 B. 2.0 C. 4.0 D. 6.0

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ANS: B The full length of the root and at least 2.0 mm of periapical bone must be visible on an intraoral periapical radiograph.

REF: Page 109 4) Most clinicians prefer the ____________ technique for periapical radiography because it provides a less distorted view of the dentition.

A. bisecting B. paralleling C. occlusal D. bitewing ANS: B Most clinicians prefer the paralleling technique for periapical radiography because it provides a less distorted view of the dentition. The paralleling technique is the most appropriate technique for digital imaging.

REF: Page 111 5) For mandibular projections, the dental chair should be positioned: A. upright and low.

B. upright and elevated.

C. back at a 45-degree angle and low.

D. back at a 45-degree angle and high.

ANS: B The dental chair should be positioned upright and elevated for mandibular projections. It should be positioned upright and low for maxillary projections.

REF: Page 109 6) For maxillary paralleled projections, the superior border of the receptor generally rests at the: A. greater palatine foramen.

B. incisive foramen.

C. free gingival margin of maxillary posterior teeth.

D. height of the palatal vault in the midline.

ANS: D For maxillary paralleled projections, the superior border of the receptor generally rests at the height of the palatal vault in the midline.

REF: Page 111

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7) When the bisecting technique is used, the receptor is positioned: A. at the midline of the palate for a maxillary projection.

B. as close as possible to the lingual surface of the teeth.

C. parallel to the long axis of the tooth.

D. perpendicular to the long axis of the tooth.

ANS: B The receptor is positioned as close as possible to the lingual surface of the teeth when the bisecting technique is used.

REF: Pages 111-112 8) To radiograph the maxillary arch, the patient’s head should be positioned upright with the sagittal plane _________ and the occlusal plane _____________.

A. horizontal; horizontal B. horizontal; vertical C. vertical; horizontal D. vertical; vertical ANS: C To radiograph the maxillary arch, the patient’s head should be positioned upright with the sagittal plane vertical and the occlusal plane horizontal.

REF: Page 112 9) When the mandibular teeth are to be radiographed, the head is: A. positioned with the occlusal plane horizontal.

B. positioned with the occlusal plane vertical.

C. tilted forward slightly.

D. tilted back slightly.

ANS: D When the mandibular teeth are to be radiographed, the head is tilted back slightly. This is done to compensate for the changed occlusal plane when the mouth is opened.

REF: Page 112 10) The film receptor should be placed so that the occlusal or incisal edge of the receptor extends _________________ the teeth.

A. 5 mm beyond B. just beyond C. to the occlusal or incisal edge of

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D. 5 mm short of the occlusal or incisal edge of ANS: B The film receptor should be placed so that the occlusal or incisal edge of the receptor extends just beyond the teeth. The film receptor is slightly larger than the film, and the entire tooth should be captured on the receptor.

REF: Page 112 11) The horizontal angulation of the tube head should be pointed so that the central ray is directed: A. at the cementoenamel junction (CEJ) of the tooth.

B. through the contacts.

C. parallel to the occlusal plane.

D. perpendicular to the midsagittal plane.

ANS: B The horizontal angulation of the tube head should be pointed so that the central ray is directed through the contacts. This angulation is usually at right angles to the buccal or facial surfaces of the teeth in each region.

REF: Page 135 12) Which of the following types of receptor are particularly valuable for detecting interproximal caries in the early stages of development before it becomes clinically apparent?

A. Occlusal B. Periapical C. Bitewing D. Panoramic ANS: C Bitewing receptors are particularly valuable for detecting interproximal caries in the early stages of development before it becomes clinically apparent. Because of the horizontal angle of the xray beam, these radiographs also may reveal secondary caries below restorations that may escape recognition in the periapical views.

REF: Page 135 13) The contact between the maxillary first and second molars often is angled a few degrees more ___________ than between the mandibular first and second molars.

A. superiorly B. inferiorly C. anteriorly

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D. posteriorly ANS: C The contact between the maxillary first and second molars often is angled a few degrees more anteriorly than between the mandibular first and second molars.

REF: Page 135 14) The aiming cylinder is positioned about ______ degrees for a bitewing examination in order to project the beam parallel with the occlusal plane.

A. +20 B. +10 C. zero D. −10 ANS: B The aiming cylinder is positioned about +10 degrees for a bitewing examination in order to project the beam parallel with the occlusal plane. This minimizes overlapping of the opposing cusps onto the occlusal surface.

REF: Page 135 15) The premolar bitewing projection should include the ______ half of the ______.

A. distal; canines B. mesial; canines C. distal; lateral incisors D. mesial; lateral incisors ANS: A The premolar bitewing projection should include the distal half of the canines. It should include the crowns of the premolars.

REF: Page 135 16) Which of the following teeth should be used as the guide for placement of the premolar bitewing receptor?

A. Maxillary canine B. Mandibular canine C. Maxillary first premolar D. Mandibular first premolar ANS: B

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Because the mandibular canines usually are more mesial than the maxillary canines, the mandibular canine should be used as the guide for placement of the premolar bitewing receptor.

REF: Page 135 17) Occlusal receptors may be made of: A. film, storage phosphor plates, CCD sensors, or CMOS sensors.

B. film, storage phosphor plates, or CCD sensors.

C. film or storage phosphor plates.

D. film only.

ANS: C Occlusal receptors may be made of film or storage phosphor plates. CCD or CMOS sensors this large are not available.

REF: Page 147 18) A __% reduction in milliamperage (mA) used for the usual young adult gives the proper density for patients under 10 years of age.

A. 75 B. 50 C. 25 D. 10 ANS: B A 50% reduction in the mA used for the usual young adult gives the proper density for patients under 10 years of age. Exposure is reduced about 25% for those between 10 and 15 years of age.

REF: Page 147 19) The primary dentition examination of a child 3 to 6 years old may consist of ______ anterior occlusal receptors, ________ posterior bitewing receptors, and up to ______ posterior periapical receptors, as indicated.

A. zero; two; two B. two; two; two C. two; two; four D. two; four; four ANS: C The primary dentition examination of a child 3 to 6 years old may consist of two anterior occlusal receptors, two posterior bitewing receptors, and up to four posterior periapical receptors, as indicated. Some find that a panoramic view, rather than the four periapical views, is more informative and results in less exposure to the child.

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REF: Page 147 20) For a maxillary anterior occlusal projection on a child with primary dentition, a number __ receptor should be placed in the mouth, and the central ray should be directed at a vertical angulation of ___ degrees through the tip of the nose toward the center of the receptor.

A. 0; +45 B. 2; +45 C. 0; +60 D. 2; +60 ANS: D For a maxillary anterior occlusal projection on a child with primary dentition, a number 2 receptor should be placed in the mouth, and the central ray should be directed at a vertical angulation of +60 degrees through the tip of the nose toward the center of the receptor.

REF: Pages 147-148 21) A complete examination of the mixed dentition consists of ____ incisor periapical views, ______ canine periapical views, _______ posterior periapical views, and two or four bitewings.

A. two; two; two B. two; two; four C. two; four; four D. four; four; four ANS: C A complete examination of the mixed dentition consists of two incisor periapical views, four canine periapical views, four posterior periapical views, and two or four bitewings.

REF: Page 148 22) Stimulating the ____________ dorsum of the tongue or the _________ palate usually initiates the gag reflex.

A. anterior; hard B. posterior; hard C. anterior; soft D. posterior; soft ANS: D Stimulating the posterior dorsum of the tongue or the soft palate usually initiates the gag reflex.

REF: Page 150

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Test Bank for Oral Radiology Principles and Interpretation, 6th Edition, White, ISBN-10: 032

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23) If panoramic equipment is not available, an examination consisting of __ intraoral views provides an excellent survey of edentulous patients.

A. 4 B. 7 C. 10 D. 14 ANS: D If panoramic equipment is not available, an examination consisting of 14 intraoral views provides an excellent survey of edentulous patients. The exposure required for an edentulous ridge is approximately 25% less than that for a dentulous ridge.

REF: Page 151

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