Lecture 3 - Radiology Flashcards Preview

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Flashcards in Lecture 3 - Radiology Deck (34):
1

Black X thru tooth?

Blue X thru tooth?

Congenitally missing

Previously extracted

2

Existing

Composite?

Amalgam?

Gold?

Porcelain/Ceramic crown?

Outline surfaces in blue

Fill in surfaces in blue

Cross hatch surface in blue

Outline tooth in blue

3

Red color means what?

Needs to be done

4

Look at slide 5 and understand what is happening.

Do it

5

What are 3 ways to maximize sharpness and resolution (image clarity)?

Use as small an effective focal spot as practical (Built into tube head)

Increase distance from focal spot to object with long open ended cylinder (aiming cylinder)

Minimize distance from object to image receptor (Film next to tooth)

6

How is image size distortion minimized? 2 ways.

Increase focal spot to image receptor distance (aiming cone)

Decrease object to image receptor distance (film placement)

7

How can image shape distortion be minimized? 2 ways.

Position image receptor (film) parallel to long axis of object (tooth)

Orient central ray (cone) perpendicular to the object and image receptor

*This can manifest as foreshortening or elongation of the film image

8

What is foreshortening?

Central beam is perpendicular to the image receptor (film), BUT the object (tooth) is not

9

What is elongation?

Central beam is perpendicular to the object (tooth), BUT not the image receptor (film)

10

What is ideal?

Central ray should be perpendicular to the long axes of both the tooth and the image receptor

11

What is the bisecting-angle technique?

Central beam should be directed at a right angle to the imaginary plane bisecting the angle formed by the image receptor (film) and the central axis of the object (tooth).

*Image is of correct length, but with distortions in tooth and height of alveolar crest

12

What is the SLOB rule?

Same Lingual - Opposite Buccal

*Used for determining if an object found on a radiograph is located buccal, lingual, or in the same plane as the teeth

-Take normal radiograph, move x-ray head so its angled from the mesial and take it again
-If object moves mesial, or the same direction as you moved the tube head, then it is LINGUAL to the teeth
-If object moves opposite, distal, then it is located buccal to the teeth

13

T/F - On a bitewing, you should see alveolar crestal bone.

TRUE

14

Define radiolucent.

Any substance (part of the patient) that permits the transmission of xrays (less dense - appears dark on the radiograph)

15

Define radiopaque.

Any substance (part of the patient) that blocks the transmission of xrays (more dense - more light)

16

T/F - Enamel is radiopaque.

TRUE

17

What is the lamina dura?

Tooth sockets are bound by a thick layer of dense bone - contiguous with cortical bone at the alveolar crest

Wider in teeth with heavy occlusion

18

Maxillary molar PA

ALL molars, including 3rds

Distal 2nd premolar

Contacts open, proximal surfaces of molars

3-5 mm past apices, minimum

19

Maxillary Premolar PA

Both premolars

Distal of canine

Medial of 1st molar

Contacts open, proximal surfaces of premolars

3-5 mm past apices, minimum

20

Maxillary Canine PA

Canine and lateral incisor

Mesial of 1st premolar

Contact open b/t canine and lateral

3-5 mm past apices, minimum

21

Maxillary Central Incisor PA

Central incisors - both

Mesials of lateral incisors

Contacts open b/t proximals of centrals

3-5 mm past apices, minimum

22

Molar BWX Molars

All upper/lower

Distal of 2nd premolar

Molar contacts open

Crestal bone clearly visible

23

Premolar BWX

Premolars - All upper/lower

Mesial of 1st molar

Distal of canines

Contacts open, proximal surfaces of premolars

Crestal bone clearly visible

24

Mandibular Molar PA

All molars including 3rds

Distal 2nd premolar

Contacts open, proximal surfaces of molars

3-5 mm past apices, minimum

25

Mandibular Premolar PA

Both premolars

Distal of canine

Mesial of 1st molar

Contacts open, proximal surface of premolars

3-5 mm past apices, minimum

26

Mandibular Canine PA

Canine and lateral incisor

Mesial of 1st premolar

Contact open b/t canine and lateral

3-5 mm past apices, minimum

27

Mandibular Central Incisor PA

Central incisors - both

Mesials of lateral incisors

Contacts open b/t proximals of centrals

3-5 mm past apices, minimum

28

The alveolar crest is what?

Gingival margin of the alveolar process that extends b/t the teeth

RADIOPAQUE

*Normal when it is not more than 1.5mm apical to the CEJ

**May recede with age

29

PDL - what is it?

CT that surrounds the root and connects it w/ the bone

Seen b/t the root and lamina dura extending from the alveolar crest around the root to the opposite alveolar crest

RADIOLUCENT

30

What is cancellous/trabecular bone?

Lies b/t cortical plates

RADIOPAQUE plates and rods surrounding RADIOLUCENT marrow pockets

31

What restorative materials are RADIOLUCENT?

Silicate cements - rare

Some composite resins

Porcelain

32

What restorative materials are radiopaque?

Amalgam
Gold
Pins/posts
CaOH2
Gutta percha
Silver points
Some composites
Stainless steel crowns
Ortho appliances
Implants

33

When can the nose be seen on a radiograph?

Max Ant PAs

Slightly radiopaque

Sometimes RADIOLUCENT nares are visible

34

Where can you see the mental foramen on a radiograph?

Just apical to the 2nd premolar