Radiology #02 – Unidontia

1. which is the best technique for detecting proximal caries in children with minimum radiation exposure

bitewing with paralleling technique

bitewing with RVG

panoramic radiography

bitewing with bisecting angle technique

Question 1 of 20

2. Deterministic effects ____.

Are seen only in the oral cavity

Show a severity of response proportional to dose

Result from particulate radiation such as alpha and beta particles but not xrays

Are found after exposure to low levels of radiation

Question 2 of 20

3. the purpose of a step down transformer in an x ray apparatus is to

control voltage to the tube filament

reduce unnecessary radiation

control potential between cathode and anode

reduce danger of "pitting " the focal spot on the anode

Question 3 of 20

4. During radiographic imaging, predominant X-rays are produced by:

Coherent scattering

Compton scattering

Photoelectric effect

Bremstrahlung radiation

Question 4 of 20

5. Mandible in single plane is seen in

OPG

Lateral obliqueque

AP view

PA view

Question 5 of 20

6. radiographic diagnosis of dense radioopaque cotton wool areas throughout the entire body of the mandible and associated with hypercementosis is most likely

enostosis

exostosis

paget's disease

osteomyelitis

Question 6 of 20

7. The radiographic appearance of Botryoid odontogenic cyst is

Orange peel appearance

Lemon peel appearance

Apple green appearance

Grape bunch appearance

Question 7 of 20

8. all of the following form radiolucent stones except

orotic acid

xanthine

allopurinol

cysteine

Question 8 of 20

9. the size of the periapical film used in adults is

22 x 35 mm

none of the above

21 x 31 mm

31 x 41 mm

Question 9 of 20

10. in which one of the following condition sialography is contraindicated

acute parotitis

ductal calculus

chronic parotitis

recurrent parotitis

Question 10 of 20

11. Discoid lupus erythematosus has all of the following characteristics except one. Which one is the exception?

Produces oral lesions that resemble erosive lichen planus

Predominately affects middle-aged women

Affects the skin of the face and scalp

Involves damage to the heart and kidney

Question 11 of 20

12. While taking IOPA radiographs of maxillary 1st molar, to avoid superimposition of the zygomatic arch, the x ray tube should be angulated :

Mesial

Distal with an increase in vertical angulation

Mesial with decrease in vertical angulation

Distal

Question 12 of 20

13. digital radiography differs from conventional in

rays other than x rays are used

no hard copy is formed

radiation receptors are different

x rays not used

Question 13 of 20

14. Dental radiographs are the legal property of the

dentist

none of the above

patient

state

Question 14 of 20

15. Elongation (the most common error) can be caused by

The film is not parallel to the long axis

All of the above

Too little vertical angulation

The occlusal plane is not parallel to the floor

Question 15 of 20

16. Which intra-oral radiographs are the most useful in detecting interproximal caries?

Bitewing x-rays

none of the above

Periapical x-rays

Occlusal x-rays

Question 16 of 20

17. Maximum fogging effect is seen by

Coherent

Compton scattering

Characteristic radiation

Photoelectric absorption

Question 17 of 20

18. A 21-year-old woman went to her dentist because of facial asymmetry. This asymmetry had developed gradually over 3 years. The patient had no symptoms. A diffusely opaque lesion was found in her right maxilla. All laboratory tests (complete blood count, alkaline phosphatase, calcium) were within normal limits. A biopsy specimen was interpreted as a fibro-osseous lesion. This patient most likely has ______.

Cementoblastoma

Cherubism

Osteosarcoma

Fibrous dysplasia

Question 18 of 20

19. which of the following radiographic feature is commonly associated with a traumatic bone cyst

dome shaped radio oacity of the maxillary sinus

scalloped radiolucency extending between the roots of teeth

unilocular radiolucency with focal radiooacity

divergence of the roots of teeth

Question 19 of 20

20. What are the components of a developing solution?

Developing agent, acidifier, antioxidant preservative, hardener

Developing agent, accelerator, restrainer

Clearing agent restrainer, accelerator, acidifier

Clearing agent, antioxidant preservative, acidifier, hardener

Question 20 of 20