Extraoral radiographic Techniques #WikiDentia

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1. The best view is visualize zygomatic arches is

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a) Jug Handle view

b) Occipito mental view

c) Orthopantamogram

d) Skull PA view

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2. panoramic radiograph is used to detect radiological abnormalities of all of the following except

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a) Mandibular condyle

b) Maxillary anteriors

c) Mandibular teeth

d)Occipital condyle

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3. Best radiograph for viewing # of maxillary bone

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b) PA view

a) Submentovertex

c) water's view

d) Towne's projection

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4. an exaggerated smile line seen in OPG is due to

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a) Patient's chin positioned too high

b) Patien's head positioned too far back

c) Patient's chin positioned too low

d) Patient's head positioned too forward

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5. In skull radiography, all of the following are the coronal projections except

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a. Caldwell projection

b. Reverse Towne’s projection

c. Submentovertex projection

d. Water’s projection

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6. The best radiograph to obtain a view of maxillary sinus is:

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a) Lateral oblique maxilla

b) Submentovertex projection

c)Water' view

d) Lateral skull

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7. The extraoral radiograph that best demonstrates the subcondylar portion f mandible is the:

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a) AP mandible

c)Towne's view

b) Water's view

d) Submental vertex

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8.Submentovertex view is best useful for

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a)Sinuses

b) Zygoma fractures

c)Mandibular fractures

d) Maxillary fractures

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9.In an internal derangement of TMJ fracture panoramic view has been taken for the patient.To confirm our diagnosis,we may take the help

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a)MRI

b) CT scan

c)Arthroscopy

d) Bone scan

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10. If multiple myeloma is suspected in a patient's history and introral radiograph, which of the following radiographs should be taken to confirm the diagnosis:

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a) Lateral skull

b) Anterior posterior view

c) Lateral oblique

d) Posterior anterior view

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11. CBCT stands for

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a) Cone beam computed tomography

b) Coil beam computed tomography

c) Combined beam computed tomography

d) Circular beam computed tomography

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12. Ankylosis of TMJ can be best viewed in:

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a) Lateral oblique view

b) Lateral view

c) Transcranial

d) PA view

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13. In cephalometric radiography the distance between the subject and the source of X-ray is

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a) 2 feet

c) 4.8 metres

b) 48 inches

d) 5 feet

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14. The best radiographic view for TMJ is

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a) Lateral oblique

c) Water's view

b) PA view

d) OPG

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15. Which of these sinuses are not appreciably seen by Waters projection?

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a. Maxillary sinus

b. Frontal sinus

c. Ethmoid sinus

d. Sphenoid sinus

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16. Submentovertex is useful in viewing

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a) Body of mandible

b) Fractures of zygomatic arch

c)Fractures of base of skull

d) All of the above

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17. Zygoma fractures can be best viewed by

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a) Occipitomental view

b) Lateral oblique

c)Townes view

d)Lateral skull

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18. In pantamograph, if patient chin is placed anterior to the focal trough, the structures appears to be

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a) Blurred and Diminished

b) Blurred and Magnified

c) Either magnified or diminished

d) Only Blurred

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19.Regarding Sialogram identify the false statement

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a) Specificity is more than salivary scan

b) Sialogram is done after salivary scan if both are indicated

c) Sialogram is anatomical and salivary scan is functional

d) None of the above

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20.The sialographic appearance of a normal salivary gland is

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a) Branching with bloom

b) Branching with leaves

c) Branchless with fruit laden

d) Branchless with leaves

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21. Ghost like shadow seen in

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a) MRI

b) OPG

c) CT

d) Cephalogram

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22.Sialogram of a normal salivary gland appears as:

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a) Leafy tree

b) Leafless tree

c) Sialolithiasis

d) Sialgectasia

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23. In bone scintigraphy all is guessed except

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a) Avascular necrosis

b) Fractures

c)Osteomyelitis

d) None

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24. Occluded submandibular salivary duct can be•best observed by

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a) Palpation

b) Sialography

c) Occlusal X-ray

d) Thermography

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25. One advantage of digital radiography is:

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a) All the teeth can be in a single film

b) Highly economical

c) The radiographic images are obtained immediately

d) Pulpal vitality can be accurately assessed.

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26. All of them use non-ionizing radiation, except:

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a) Ultrasonography

c) MRI

b) Thermography

d) Radiography

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27. The radiographic view for nasal fracture:

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a. True lateral skull

b. Water’s view

c. PA Skull

d. Submentovertex

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28. Which of the following is used to show the base of the skull,sphenoid sinus, position and orientation of the condyles,and fractures of the zygomatic arch?

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a) The TMJ surgery

b) Submentovertex projection

c) Reverse-Towne projection

d) The facial profile survey

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29. Water's projection is useful for evaluating:

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a) Frontal and ethmoidal sinuses

b) Zygomatico frontal suture and nasal cavity

c) Maxillary sinuses

d) All of the above

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30. In Water’s projection, a Frankfort horizontal angulation to the detector is

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a. 10° to 20°

b. 37° to 40°

c. 20° to 30°

d. 50° to 60°

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31. In anterior mandibular occlusal projection, the central X-ray beam enters the patient's face through the:

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a) tip of the chin

c) floor of the mouth

b) tip of the nose

d) below the chin

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32. In anterior maxillary occlusal projection, the central ray of the X-ray beam enters the patient's face through the:

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a) tip of the chin

c) bridge of the nose

b) tip of the nose

d) Glabella

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33. Following are the types of lateral oblique views except

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a. Ramus view

b. Body of mandible

c. Body of maxilla view

d. Bimolar view

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34. For which of these purposes are extraoral radiographs least suitable?

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a. Detection of interproximal caries

b. Locating impacted teeth

c. Viewing the sinuses

d. Determining the extent of a fracture

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35. Which of these radiographs is most frequently prescribed by the orthodontist?

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a. Transcranial

b. Lateral cephalometric

c. Waters

d. Reverse Towne

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36. The disadvantage of ultrasonography is:

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a) Cannot differentiate between solid & cystic lesions

b) Depends on observer's perception

c) Cannot be used for dynamic functions

d) All the above

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37. The general practitioner is most likely to use which of these extraoral radiographs?

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a. Posteroanterior cephalometric

b. Reverse Towne

c. Panoramic

d. Submentovertex

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38. Digital radiography differs from conventional in

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a) X-rays not used

b) Rays other than X-rays are used

c) Radiation receptors are different

d) No hard copy is formed

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39.The disadvantage of standard cephalometric radiograph is that it

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a) Has cumbersome developing and fixing procedure

b) Produces two dimensional representation of a three dimensional structure

c) Is difficult to handle the X-ray unit

d) Has high radiation hazard

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40.Three dimensional localization of a tooth in maxillary sinus is best achieved with the following

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a) IOPA+ maxillary Occlusal

b) Lateral cephalogram +maxillary occlusal

c) OPG+ maxillary occlusal

d) Water+ maxillary occlusal

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41. Which of the following structures/objects can give risk to Ghost image on orthopantomograph (OPG)?

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a) Nose ring

b) Vertical ramus of mandible

c) Foreign body in upper lip

d) Lip omament

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42. Black artifacts on extraoral radiographs may result from each of the following EXCEPT one. Which one is the EXCEPTION?

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a. Static electricity

b. Glove powder residue

c. Rapidly removing films from the packaging

d. Scratched intensifying screens

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43. Intensifying screens will

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a. increase x-ray intensity.

b. increase image detail.

c. reduce exposure time.

d. decrease processing time.

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44. What term describes the crystals used in the emulsion of intensifying screens?

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a. Phosphors

b. Halides

c. Sulfates

d. Bromides

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45. Which of these is NOT a way to identify extraoral radiographs?

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a. Embossed identification dot

b. Commercial identification printer

c. Lead letters “R” and “L”

d. Lead plates affixed to the cassette

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