Radiographs Flashcards
(46 cards)
Briefly describe how radiographs work?
X-ray photons beamed through an object at a receptor
Attenuation patterns reveal radiographic image, allowing dense material to be visualised
What does the term ‘Transmitted’ mean in the context of Radiography?
Photons pass through unaltered
What does the term ‘Absorbed’ mean in the context of Radiography?
Photons stopped by tissue
What does the term ‘Scattered’ mean in the context of Radiography?
Photons change direction
What does the term Radiolucent mean?
Dark areas on the image
Less attenuation of X-rays
Tissue is less dense and allows X-ray transmission shows e.g. caries
What does the term Radiopaque mean?
Light areas on the image
Greater attenuation of X-rays
Tissue is more dense and ‘Absorbs’ X-rays
E.g. restoration
Provide three examples of intra-oral radiograph techniques?
Bitewing
Periapical
Occlusal
Provide two examples of Extra-oral radiograph techniques?
Panoramic
Lateral cephalogram
What is CBCT?
CBCT: Cone beam computed tomography
Provide cross-sectional imaging of the teeth/jaws: “3D scan”
Lowest resolution, ⬆️ Radiation dose, ⬆️ Cost
When do we have to use CBCT?
when routine dental imaging cannot provide the required information
Why do we use radiographs?
1-To show anatomy & pathology not visible to the naked eye
2- Allows visualisation of Hard/mineralised tissues
Curve of spee
• Normal anatomical curvature of the occlusal plane
• Curves upwards posterior
How we can indicate which tooth are shown in the radiograph?
Anatomical features:
1- Crown morphology
- shape
- number of cusps
2- Root morphology
- 1 root: incisors, canines, some premolars
- 2 roots: some premolars, ↓ molars
- 3 roots: ↑ molars
3- Curve of Spee
4 - Surrounding non-dental anatomy
What is non-dental anatomy?
• Maxillary teeth
➢ Maxillary sinus
➢ Nasal cavity
➢ Maxillary tuberosity
• Mandibular teeth
➢ Inferior alveolar canal
➢ Mental foramen
➢ Inferior border of mandible
➢ External oblique ridge
• Mental foramen lies below premolars
What type of radiograph that provides view of side teeth - crowns, some root and interdental bone?
Intra- oral bitewing radiography
What type of radiograph this image shows?
Bitewing radiograph
What type of radiograph that provides a full length view of tooth/teeth (Hence apical)
Periapical radiography
What type of radiograph this image shows?
Periapical radiography
What type of radiograph provides ‘zoomed-out’ view of jaw, showing entire dentition\Reduced resolution as a result of scale?
Extra-oral Panoramic radiography
What type of radiograph this image shows?
Panoramic radiography
What type of radiograph that provides maxillary or mandibular view of dental arch?
Intra-oral occlusal radiography
What type of radiograph this image shows?
Occlusal radiography
What type of radiograph this image shows?
Occlusal radiograph
What type of radiograph this image shows?
Cross-sectional Cone beam computed tomography
