2A- Hard and soft tissues radiographs Flashcards
(27 cards)
What is another word for a shadow picture?
Skiagram
What is the source of X-rays?
an x ray tube, electrons hit a target of tungsten
What metal do the electrons hit?
Tungsten
When a high voltage is applied, what does it fo?
Produces x-rays photons (packets of energy)
What are the 2 types of receptors for x-ray imaging?
- Film (analogue)
2. Digital detector
What is the key to imaging?
Differential absorption of x-rays in different tissues
What 3 things determine how many x-rays can be absorbed by a material?
- Atomic number
- Density
- Thickness
What is radiolucency?
Most of the x-rays pass through the structure and hit the receptor (dark image)
What is radiopaque?
Most x-rays are absorbed by the structure, less hit the receptor (light image)
What is the socket of the tooth called?
Lamina Dura
What is hypercementosis?
Excessive build up of cementum on the roots of the tooth
What can you use to differentiate between soft tissues?
a ct scan
What is CT scanning?
Computed tomography, uses higher energy x-rays with more sensitive detectors
Does fat absorb more or fewer x-rays than soft tissues?
Fat absorbs fewer x-rays
Name the 2 types of intra-oral radiographs and their uses
- Bitewing radiographs - For caries diagnosis, and showing periodontal bone
- Periapical radiographs - For periapical diagnosis
Name the 3 types of extra-oral radiographs and their uses?
- Panoramic Radiography- shows developing dentition and large abnormalities.
- Cephalometric Radiography - primarily orthodontic planning
- Cone Beam Computed Technology - Simple form of CT scan
What errors can panoramic radiographs lead to?
Very sensitive to mistakes, leads to an inncorrect horizontal magnification
What are the main uses of panoramic radiographs?
- To check for large abnormalities
- Identifying the presence and position of developing dentition
What are the initial signs of the tooth?
A radiolucent cyst
What do you call extremely radiopaque bone?
Osteopetrosis
What do you call vary radiolucent bone?
Hyperparathyroidism
What is dental caries?
The demineralisation of enamel and dentine
Where does calcification appear?
At the tip of cusps or incisal edges
What is hyperdontia?
Extra teeth
