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Dental Radiography > Dental Radiography > Flashcards

Dental Radiography Flashcards

1
Q

Which direction will a palatally/lingually positioned tooth appear to move?

A

I’m the same direction as the x-day tubehead

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2
Q

Which direction will a buccally positioned tooth appear to move?

A

The opposite way to the x-day tubehead

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3
Q

If an unerupted tooth is in the line of the arch with way will it move?

A

It doesn’t move

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4
Q

What are the clinical indications for using parallax?

A

To assess the position of unerupted maxillary canines, odontomes and supernumaries

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5
Q

How can you achieve parallax in the vertical plane?

A

Panoramic radiograph and an upper standard occlusal

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6
Q

How can you achieve parallax in the horizontal plane?

A

2 PA’s

One incisal and one in the canine region

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7
Q

How many degrees is the tubehead angled downwards for an upper standard occlusal?

A

65-70 degrees

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8
Q

Kv determines?

A

Quality of photons

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9
Q

Ma determines?

A

Quantity of photons

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10
Q

What is the maximum limit of radiation for unclassified workers ie me

A

6msv

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11
Q

What does he radiation protection file include?

A

Local rules

Employers written procedures

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12
Q

When did ionising radiation regulations 1999 come into force?

A

1st jan 2000

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13
Q

What did ionisin radiation regulations 1999 replace?

A

Ionising radiation regulations 1985

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14
Q

What areas do approximately varies effect

A

Medial/distal

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15
Q

X rays can be absorbed by human tissue

A

True

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16
Q

The photo electric effect predominates with high x-ray photon energies

A

False

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17
Q

The photoelectric effect is primarily responsible for producing contrast between different images

A

True

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18
Q

X-ray set filters are usually made of aluminium

A

True

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19
Q

Colimators restrict the x ray beam size

A

True

20
Q

Dental xray set filters remove most of the low energy photons from the xray beam

A

True

21
Q

Dose reduction to the patient is achieved by using long FSDd

A

True

22
Q

Effective dose is estimated at between 0.001Sv and0.008sv

A

False

23
Q

Effective dose is estimated at between 0.016msv and 0.026msv taking into account the salivary glands

A

True

24
Q

Deterministic (non stochastic effects) have a high threshold

A

True

25
Q

All surgery walls should be lead lined and coated in barium plaster

A

False

26
Q

I’m radiographs of the maxilla the antral floor can creative a thins dense radiolaria line

A

True

27
Q

The antrum creates a radiolucent shadow that can overlie the posterior teeth

A

True

28
Q

When taking a parralleling PA the xray beam is aimed at 90 degrees to the image receptor

A

True

29
Q

Bite wings involve the xray beam being aimed directly through contact points of the teeth

A

True

30
Q

Dark film fault

A

Fogging
Over exposure
Over developed

31
Q

In panoramic tomography the incisors will appear wide if the patient is too close

A

False they will appear smaller

32
Q

During oblique lateral radiography beam aiming device is used to align the beam at right angles to the image receptor

A

False

33
Q

Estimated risk of fatal cancer resulting from insta-oral radiography

A

1 in 10,000,000

34
Q

Age group at highest risk of somatic stochastic effects

A

0-10 years

35
Q

How should the image receptor be aligned for a parralleling PA

A

Parrallel to the tooth

36
Q

Radiographic keyhole

A

Oblique lateral radiographs

37
Q

How should a patient be placed within a cephalostat for a lateral ceph radiograph

A

So the xray beam is perpendicular with both the midline Sagittal plane and film/sensor

38
Q

How many hours of cpd must radiographs complete in a five year cycle

A

5 hours

39
Q

Which type of dose accounts for both the type of radiation used and the sensitivity of body tissues to radiation damage?

A

Effective dose

40
Q

What is the dose for classified workers?

A

20msv

41
Q

What is the dose limit for the general public?

A

1msv

42
Q

Effective dose for bite wings/pa

A

0.003-0.022msv

43
Q

Effective dose for panoramic radiograph

A

0.0027-0.038 msv

44
Q

Effective dose for upper standard occlusal

A

0.008

45
Q

Effective dose for lateral cephalometric

A

0.002-0.0056

46
Q

Cancer risk of panoramic radiographs?

A

One in one million

Dental Radiography (1 decks)

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