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16 Flashcards

1
Q

o prevents secondary scatter
o lead films
o placed between the patient & film

A

Grid

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2
Q

Equipment preparation :

A
  1. Load the extraoral cassette in the dark room.
    Place one extraoral film bet. Two intensifying screens and securely close the cassete
  2. Set the exposure factors
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3
Q

PATIENT PREPARATION:

A
  1. Explain to the patients the procedure
  2. Place the lead apron without the thyroid collar
  3. Remove all objects from head and neck region
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4
Q

Film parallel to midsagittal plane

A

Lateral cephalometric

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5
Q

Canthomeatal line at 30 with film

A

Reverse towne

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6
Q

Cathomeatal line parallel to film

A

SUBMENTOVERTEX

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7
Q

Canthomeatal line at 37 with film

A

Waters

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8
Q

Cantomeatal line at 10 with film

A

Posterioranterior cephalometric

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9
Q

used to examine the posterior region of the mandible

A

LATERAL JAW RADIOGRAPHS

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10
Q

patients with limited jaw opening due to a fracture or swelling and in patients who have difficulty in stabilizing or tolerating intraoral film placement

A

LATERAL JAW RADIOGRAPHS

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11
Q

PURPOSE
→ evaluate impacted teeth, fractures, and lesions located in the body of the mandible
→ demonstrates the mandibular premolar and molar regions as well as the inferior border of the mandible

A

BODY OF THE MANDIBLE PROJECTION

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12
Q

PURPOSE
→ evaluate impacted third molars, large lesions, and fractures

A

RAMUS OF THE MANDIBLE PROJECTION

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13
Q

can be exposed using a standard intraoral x-ray machine but
most require the use of an extraoral unit and cephalostat

A

SKULL RADIOGRAPHS

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14
Q

→ used to examine the bones of the face and skull
→ most often used in oral surgery and orthodontics

A

SKULL RADIOGRAPHS

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15
Q

evaluate facial growth and development, trauma, and disease and developmental abnormalities

→ demonstrates the bones of the face and skull as well as the soft tissue profile of the face

A

LATERAL CEPHALOMETRIC PROJECTION

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16
Q

is a line extending from the top of the ear canal to the bottom of the eye socket.

A

The Frankfort plane

17
Q

→ evaluate facial growth and development, trauma, and disease and development abnormalities
→ demonstrates the frontal and ethmoid sinuses, the orbits, and the nasal cavity

A

POSTEROANTERIOR PROJECTION

18
Q

→ evaluate the maxillary sinus area

A

WATERS PROJECTION

19
Q

→ identify the position of the condyles, demonstrate the base of the skull, and evaluate fractures of the zygomatic arch

→ demonstrates the sphenoid and ethmoid sinuses and the lateral wall of the maxillary sinus

A

SUBMENTOVERTEX PROJECTION

20
Q

if the zygomatic arch is the area of interest, the exposure time is reduce to approximately one-third the normal exposure time

A

SUBMENTOVERTEX PROJECTION

21
Q

identify fractures of the condylar neck and ramus area

A

REVERSE TOWNE PROJECTION

22
Q

FILM PLACEMENT

cassette placed flat against the patient’s ear and centered over TMJ

A

TRANSCRANIAL PROJECTION (LINDBLOM TECHNIQUE)

23
Q

PURPOSE
→ evaluate the superior surface of the condyle and the articular eminence
→ also used to evaluate movement of the condyle when the mouth is opened and to compare the joint spaces (right vs. left)

A

TRANSCRANIAL PROJECTION (LINDBLOM TECHNIQUE)

24
Q

film and x-ray tubehead are moved in opposite directions around a fixed rotation point

o the location of this rotation point determines what plane of
the head will be imaged

A

TEMPOROMANDIBULAR JOINT TOMOGRAPHY

25
Q

requires a special x-ray unit, such as the Quint Sectograph

A

TEMPOROMANDIBULAR JOINT TOMOGRAPHY

26
Q

→ provides the most definitive imaging of the bony components of the TMJ

o the condyle, articular eminence and glenoid fossa can all be examined on a radiograph known as the tomogram

A

TEMPOROMANDIBULAR JOINT TOMOGRAPHY

27
Q

→ produce a much better picture of lesions or fractures

A

CONE BEAM COMPUTED TOMOGRAPHY

28
Q

refers to the measurement of ionization in air produced by x-rays

A

EXPOSURE

29
Q

measures the intensity of the radiation field as opposed to the amount of radiation absorbed

A

EXPOSURE

30
Q

the amount of energy absorbed by a tissue

A

DOSE

31
Q

measures the total energy absorbed by any type of ionizing radiation per unit of mass of any type of matter

A

Dose

32
Q

varies with the type and energy of radiation and type of matter absorbing the energy

A

Dose

33
Q

measurement used to compare the biologic effects of different types of radiation

A

DOSE EQUIVALENT

34
Q

unit of electrical charge; the quantity of electrical charge transferred by 1 ampere in 1 second

A

Coulombs

35
Q

unit of electrical current strength; current yielded by 1 volt against 1 ohm of resistance

A

Ampere

36
Q

unit of energy equivalent to 1.0 x 10^-7 joules or to 2.4 x 10^-8 calories

A

Erg

37
Q

SI unit of energy equivalent to the work done by the force of 1 newton acting over the distance of 1 meter

A

Joule

38
Q

SI unit of force; the force that, when acting continuously on a mass of 1 kg, will impart to it an acceleration

A

Newton

39
Q

unit of mass equivalent to 1000 grams or 2.205 pounds

A

Kilogram

roent (10 decks)

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