Intraoral techniques

Question 1

What should be seen on a periapical?

Answer 1

The entire length of the crown and root
2mm of bone beyond apex
Full extent of lesion and surrounding normal bone

Question 2

What are the 5 indications for periapicals?

Answer 2

1. Restorations
2. Caries
3. RCT or perio treament
4. Swelling/fistula
5. Pulpitis or pulp necrosis

Question 3

What should be seen on a bite wing?

Answer 3

Entire crown and 1/3 of the root of upper and lower posteriors, surrounding crestal bone, inter proximal contacts

Question 4

What are the indications for a bite wing?

Answer 4

1. Clinical suspicion of inter proximal area
2. Smooth surface caries
3. See how close caries are to pulp
4. Visualize restorations, overhang, etc.

Question 5

In the paralleling technique the image receptor is _____ to the ________ of the tooth?

Answer 5

Parallel to the long axis

Question 6

What is typically increased in the paralleling technique?

Answer 6

The object to film distance

Question 7

How do we compensate for the increased object to film distance in the paralleling technique?

Answer 7

Maximize the source to object distance

Question 8

What are the advantages to the paralleling technique?

Answer 8

Teeth are dimensionally accurate and non-diagnostic radiation is reduced

Question 9

What are the disadvantages to the paralleling technique?

Answer 9

Large object to film distance may raise magnification and lower sharpness
Difficult placement in small mouths and around tori

Question 10

What are the advantages to the bisecting angle technique?

Answer 10

Ease of placement in smaller mouths and easier positioning of the tube head due to a shorter cone

Question 11

What are the disadvantages of the bisecting angle technique?

Answer 11

Difficult to visualize the receptor for correct angulation

Image receptor may slip or bend

Hard to get dimensionally accurate images

Question 12

What is seen in the maxillary central view?

Answer 12

The centrals and portions of the laterals

Question 13

What are the requirements for the maxillary central view?

Answer 13

Edges of the teeth parallel to image edge and clear contacts

Question 14

In the maxillary canine-lateral view what is centered on the image?

Answer 14

The contact of the lateral and canine, it is seen clearly without overlap

Question 15

What teeth are visible on the maxillary premolar view?

Answer 15

The distal half of the canine to the 2nd molar

Question 16

On the maxillary premolar view which contacts must not overlap?

Answer 16

Canine to 1st molar contacts

Question 17

The maxillary molar view shows what teeth?

Answer 17

The distal half of the 2nd premolar, the 3 molars, and the tuberosity

Question 18

What teeth are included in the mandibular central view?

Answer 18

All 4 incisors, mesial of canines

Question 19

In the mandibular canine lateral view what is centered on the image?

Answer 19

The canine lateral contact, it is shown clearly without overlap just like the maxillary

Question 20

Are the mandibular premolar views and molar views any different than maxillary?

Answer 20

No, show the same things

Question 21

What is seen on a premolar bite wing?

Answer 21

Crowns and crestal bone from distal of canine to 1st molar

Clear contacts, occlusal plane is parallel to image receptor edge

Question 22

What is seen on a molar bite wing?

Answer 22

The distal of the 2nd premolar to the distal of the last molar

Question 23

Why would you use a vertical bite wing?

Answer 23

The patient has a history or or evidence of periodontal bone loss

Question 24

What brand of positioning instrument is used at the school and what does it stand for?

Answer 24

Rinn XCP, extended cone paralleling

Question 25

What colors indicate what kind of radiograph?

Answer 25

``` Blue= anterior PA Red= bite wing Yellow= posterior PA ```

Question 26

What should be inserted in the mouth opposite the bite block?

Answer 26

A cotton roll in the buccal vestibule

Question 27

Which quadrants are taken one after the other?

Answer 27

1 and 3 then 2 and 4

Question 28

On the maxilla, why is the film often far from the tooth?

Answer 28

Hard palate gets in the way

Question 29

On the mandible, is the film closer or further from the tooth?

Answer 29

Close, resulting in shorter object film distance

Question 30

As a result of the shorter object film distance on the mandible we can?

Answer 30

Use a shorter collimator, less magnification and blurriness

Question 31

What are indications for an occlusal view?

Answer 31

Trauma, patient unable to fully open, large lesions, localized lesions, impacted teeth

Question 32

A maxillary occlusal view is useful for?

Answer 32

alveolar fractures, periapical lucencies, and midline abnormalities

Question 33

What is a mandibular topographical occlusal view for?

Answer 33

Sympheasal fractures and midline anomalies

Question 34

The mandibular topographical occlusal view is useful for?

Answer 34

Those who have limited ability to open their mouths

Question 35

The mandibular cross sectional occlusal view is useful for?

Answer 35

Expansile lesions and seeing stones in the submandibular duct