CHAPTER 18: BISECTING TECHNIQUE

Question 1

To divide into two equal parts

Answer 1

bisect

Question 2

this technique is based on two triangles are equal if the triangles have two equal angles and share a common side

Answer 2

bisecting technique

Question 3

In the bisecting technique the receptor must be placed along the _____ surface of the tooth

Answer 3

lingual

Question 4

a plane that divides in half, or bisects, the angle formed by the receptor and the long axis of the tooth. This plane is termed the

Answer 4

imaginary bisector

Question 5

the central ray is directed at an angle of _____ degrees to the imaginary bisector, two imaginary equal triangles are formed.

Answer 5

90

Question 6

When the rule of isometry is followed strictly, the image of the tooth will be accurate. TRUE OR FALSE

Answer 6

true

Question 7

In dental imaging, _____images occur when the beam angulation is too flat

Answer 7

longer

Question 8

Shorter images occur when the beam angulation is too ______

Answer 8

steep

Question 9

used to position an intraoral receptor in the mouth and maintain it in position during exposure

Answer 9

beam alignment devices

Question 10

can be added to the plastic aiming rings to reduce the radiation received by the patient

Answer 10

snap-on-ring collimators

Question 11

designed to aid in the determination of horizontal and vertical angulations, prevent cone-cuts, and minimize distortion from receptor bending

Answer 11

Rin BAI system

Question 12

used to position the receptor in the mouth and maintain it in position during exposure.

Answer 12

Receptor holding devices

Question 13

examples of receptor holders include

Answer 13

stabe bite block

rinn snap a ray holder

(reusable and must be sterilized after each use)

Question 14

what size is used for all periapical projections with the bisecting technique.

Answer 14

size 2 intraoral receptor

Question 15

a term used to describe the alignment of the central ray of the x-ray beam in horizontal and vertical planes.

Answer 15

angulation

Question 16

refers to the positioning of the PID and the direction of the central ray in a horizontal, or side-to-side, plane

Answer 16

horizontal angulation

Question 17

With correct horizontal angulation, the central ray is directed _______ to the curvature of the arch and through the contact areas of the teeth. As a result, the contact areas on the dental image appear “opened.”

Answer 17

perpendicular

Question 18

Incorrect horizontal angulation results in _______ contact areas

Answer 18

overlapped (unopened)

Question 19

refers to the positioning of the PID in a up-and-down, plane

Answer 19

Vertical angulation

Question 20

With the bite-wing technique using tabs, the vertical angulation is predetermined; the central ray is directed at ___ degrees to the occlusal plane

Answer 20

+10

Question 21

Correct vertical angulation results in a dental image that is _______________________

Answer 21

the same length as the tooth

Question 22

results from excessive vertical angulation.

Answer 22

foreshortening

Question 23

When the vertical angulation is too steep, the image of the tooth appears what ?

Answer 23

shorter than the actual tooth

Question 24

________ refer to images of the teeth that appear too long. Results from insufficient vertical angulation

Answer 24

Elongation

Question 25

When the vertical angulation is too flat, the image of the tooth appears what?

Answer 25

longer than the actual tooth

Question 26

5 rules for bisecting technique

Answer 26

1. RECEPTOR PLACEMENT
2. RECEPTOR POSITION - Must be placed against the lingual surface of the tooth
3. VERTICAL ANGULATION - central ray of xray beam must be perpendicular to the IMAGNINARY sector.
4. HORIZONTAL ANGULATION- central ray must be directed through contact areas between teeth
5. Receptor Exposure- xray beam centered on the receptor.

Question 27

When using the bisecting technique, an __________ or definite order for periapical receptor placements and exposures, must be followed

Answer 27

exposure sequence

Question 28

the specific area where the receptor must be positioned before exposure, is dictated by the teeth and surrounding structures that must be included on the resultant dental image.

Answer 28

receptor placement

Question 29

advantages of bisecting technique

Answer 29

can be used without a beam alignment device

decreased exposure time

Question 30

disadvantages of bisecting technique

Answer 30

image distortion

angulation problems

Question 31

• The bisecting technique is an intraoral technique used to expose ________ images. This technique is based on the concept of bisecting the angle formed by the receptor and the ___ _____ of the tooth.

Answer 31

periapical

long axis

Question 32

(1) the receptor is placed along the ____ surface of the tooth;
(2) at the point where the receptor contacts the tooth, the __________and the _________ of the tooth form an angle
(3) an imaginary bisector divides the angle in half, or _____ it; and
(4) the central ray of the x-ray beam is directed _______to the imaginary bisector.

Answer 32

lingual

plane of the receptor/ long axis

bisects

perpendicular

Question 33

is a shorter or longer PID recommended for bisecting technique?

Answer 33

shorter PID