Radiographic Interpretation and Caries In Radiographs Flashcards
When do the molar teeth usually erupt
6, 12 and 18
When is root formation complete
Fully formed 3 years after they erupt
What is a mesiodens tooth
A supernumerary tooth between the upper central incisors
Which teeth are most likely to be missing
Lateral incisors
Second premolars
Third molars
What is a supplemental tooth
A supernumerary tooth that looks like a normal tooth - may be impossible to distinguish the normal one
What is another common site of supernumerary or missing teeth
Midline of the maxilla
What are the common sites for caries
Pit and fissure - occlusal surface of premolars and molars and buccal surface of first molars
Smooth surface - interproximal, lingual and root
Secondary
What are the different methods of caries diagnosis (7)
Visual - wet and dry Radiography - film and digital Elective temporary tooth separation Fibreoptic transillumination Electrical methods Laser fluorescence Calcivis - detects calcium ion loss from tooth surface
How is interproximal caries detected on bitewings
Look at each of the proximal surfaces for a radiolucency that causes a break
Why are interproximal caries harder to see in younger children
Due to overlap
What is cervical burnout
Phenomenon caused by relative lower X-ray absorption of the mesial or distal aspect of teeth, between the edge of the enamel and the adjacent crest of the alveolar ridge
These areas appear relatively radiolucency with ill-defined margins
Mimics root surface caries
What do irregular margins on a restoration suggest
An amalgam restoration is present
What do smooth margins on a restoration suggest
A gold restoration is present
Why are the buccal-lingual dimensions of teeth in a radiograph variable
Thickness of different structures in the tooth will vary between parts of the teeth
eg - edges contain more enamel with perhaps no dentine
During periodontal assessment, what should be taken if pockets are 4-5mm
Horizontal bitewings
In periodontal assessment, what should be taken if pockets are =>6mm
Vertical bitewings and periapicals if bone isn’t shown
In periodontal assessment, what should be taken if bone levels are irregular
May supplement with periapicals
When are panoramics useful in periodontal assessment
Useful for overview of all teeth, supplemented by periapicals
In periodontal assessment, what should be taken for suspected perio/endo lesions
Periapicals
Describe the angles used during periodontal radiology
Horizontal angle 90* to line or arch to avoid overlap of adjacent teeth
Vertical angle 90* to long axis of tooth
