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DANB RHS Exam (new) > Chapter 20: Bisecting Technique > Flashcards

Chapter 20: Bisecting Technique Flashcards

1
Q

Define the term: angle

A

in geometry, a figure formed by two lines diverging from a common point

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2
Q

Define the term: angulation

A

the alignment of the central x-ray beam in the horizontal and vertical planes

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3
Q

Define the term: anterior

A

towards the front

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4
Q

Define the term: beam alignment device

A
  • a device used to align the position-indicating device in relation to tooth and image receptor
  • positions the intraoral image receptor in the mouth and retains the image receptor in position during exposure
  • helps stabilize the image receptor in the mouth and reduces the chances of movement, thus reducing the patient’s exposure to x-radiation
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5
Q

Define the term: bisect

A

to divide into two equal parts

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6
Q

Define the term: bisecting technique

A
  • an intraoral imaging technique used to expose periapical receptors
  • the image receptor is placed along the lingual surface of the tooth, the central ray of the x-ray beam is directed perpendicular to the imaginary bisector formed by the image receptor and the long axis of the tooth
  • receptor holder is used to stabilize the image receptor
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7
Q

Define the term: congruent triangles

A

in geometry, triangles that are identical and correspond exactly when superimposed

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8
Q

Define the term: contact areas

A

the areas where adjacent tooth surfaces touch each other

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9
Q

Define the term: elongated image

A

an image of a tooth that appears long and distorted

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10
Q

Define the term: elongation

A
  • a term used in imaging to describe an image of a tooth that appears longer than the actual tooth
  • results from flat or insufficient vertical angulation
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11
Q

Define the term: equilateral triangle

A

in geometry, a triangle with three equal sides

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12
Q

Define the term: exposure sequence

A

a defined order to place and expose intraoral receptors

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13
Q

Define the term: forshortened image

A

an image of a tooth that appears short and distorted

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14
Q

Define the term: forshortening

A
  • a term describing the image of a tooth that appears shorter than the actual tooth
  • results from steep or excessive vertical angulation
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15
Q

Define the term: horizontal

A

a side-to-side plane

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16
Q

Define the term: horizontal angulation

A

the positioning of the position-indicating device in a horizontal plane

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17
Q

Define the term: hypotenuse

A

in geometry, the side of a right triangle opposite the right angle

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18
Q

Define the term: image receptor

A

a recording medium (ex: PSP plate, digital sensor)

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19
Q

Define the term: image receptor holder

A

a device used to hold an intraoral image receptor in the mouth and stabilize the receptor’s position during the exposure

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20
Q

Define the term: image receptor placement

A

the specific area where the image receptor must be positioned before exposure

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21
Q

Define the term: imaginary bisector

A
  • an imaginary plane that divides in half the angle formed by the image receptor and the long axis of the tooth
  • creates two equal angles and provides a common side for the two imaginary equal triangles
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22
Q

Define the term: interproximal

A

between two adjacent surfaces

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23
Q

Define the term: intersecting

A

cutting across or through

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24
Q

Define the term: intraoral

A

inside the mouth

25
Q

Define the term: intraoral image

A
  • an image the results when an image receptor is placed inside the mouth and exposed to x-rays
  • used to examine teeth
26
Q

Define the term: intraoral imaging examination

A

a dental imaging inspection of teeth and intraoral adjacent structures

27
Q

Define the term: isometry

A

equality of measurement

28
Q

Define the term: long axis of a tooth

A

an imaginary line that divides a tooth longitudinally into two equal halves

29
Q

Define the term: object-receptor distance

A
  • the distance from the object being imaged (tooth) to the image receptor influences image magnification
  • less image magnification results when the tooth and the image receptor are as close as possible, and more magnification results when the tooth and receptor are far apart
30
Q

Define the term: open contacts

A

on a dental image, appears as a thin radiolucent line between adjacent tooth surfaces

31
Q

Define the term: overlapped contacts

A

on a dental image, the area where the contact area of one tooth is superimposed over the contact areas of an adjacent tooth

32
Q

Define the term: parallel

A

moving or lying in the same plane; always separated by the same distance and not intersecting

33
Q

Define the term: periapical

A

around the apex of a tooth

34
Q

Define the term: periapical examination

A

a type of intraoral imaging examination used to view the entire tooth (crown and root) and supporting bone

35
Q

Define the term: periapical image

A

intraoral image that is used to examine the crowns and roots of teeth

36
Q

Define the term: periapical receptor

A

an intraoral image receptor used to examine the entire tooth (crown and root) and supporting bone

37
Q

Define the term: position-indicating device (PID) / cone

A
  • an open-ended, lead-lined cylinder extending from the opening of the tubehead

*aims and shapes the x-ray beam

38
Q

Define the term: right angle

A

in geometry, an angle of 90 degrees formed by two lines perpendicular to each other

39
Q

Define the term: right triangle

A

in geometry, a triangle with one 90-degree angle

40
Q

Define the term: Rinn Snap-A-Ray Holder

A

an intraoral receptor holder used to stabilize an image receptor during exposure

41
Q

Define the term: Rinn XCP instrument

A
  • a type of beam alignment device that is used with the paralleling technique
  • includes plastic bite blocks, plastic aiming rings, and metal indicator arms
42
Q

Define the term: rule of isometry

A

a geometric principal that states that “two triangles are equal if they have two equal angles and share a common side”

43
Q

Define the term: Stabe Biteblock

A

a disposable styrofoam device that can be used to hold an image receptor during exposure

44
Q

Define the term: triangle

A
  • in geometry, a figure formed by connecting three points not in a straight line by three straight-line segments
  • has three angles
45
Q

Define the term: vertical

A

an up-and-down plane

46
Q

Define the term: vertical angulation

A

the positioning of the position-indicating device in a vertical plane

47
Q

What geometric principle is the bisecting technique based on?

A

rule of isometry

48
Q

Where is the image receptor placed when using the bisecting technique?

A

along the lingual surface of the tooth

49
Q

Once the image receptor is placed, how must the central ray be positioned against the imaginary bisector when using the bisecting technique?

A

the central ray must be perpendicular to the imaginary bisector

50
Q

What images can be taken using the bisecting technique?

A

periapical images

51
Q

What is the correct horizontal angulation in the bisecting technique?

A

the central ray is directed perpendicular to the dental arch and through the contact areas of the teeth

52
Q

How will the contact areas appear as a result of correct horizontal angulation in the bisecting technique?

A

opened contacts

53
Q

How will the contact areas appear as a result of incorrect horizontal angulation in the bisecting technique?

A

overlapped contacts

54
Q

What is the correct vertical angulation in the bisecting technique?

A
  • vertical angulation is determined by the imaginary bisector
  • the central ray is directed perpendicular to the imaginary bisector
55
Q

What is the result of correct vertical angulation when using the bisecting technique?

A

the image is the same length as the tooth

56
Q

What is the result of incorrect vertical angulation when using the bisecting technique?

A

the image is not the same length as the tooth, and appears distorted or elongated

57
Q

What is the primary advantage of using the bisecting technique?

A

eliminating the use of a beam alignment device

58
Q

What is the primary disadvantage of using the bisecting technique?

A

dimensional distortion

DANB RHS Exam (new) (16 decks)

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