Radiographic Anatomy Flashcards
radiolucent
beam is less attenuated so there are darker areas on the radiograph e.g. caries
radiopaque
beam is more attenuated so there are lighter areas on the radiograph e.g. bone
lamina dura
cortical bone of tooth socket. shown as a radiopaque line
how is caries seen on a radiograph
as a radiolucency (darker)
how are restorations seen on a radiograph
as a radiopacity (lighter)
what is cervical burnout
a triangular shaped radiolucency at the neck of the teeth (ECJ)
how does cervical burnout occur
artefactual phenomenon created by anatomy of the teeth and the varied penetration of the x-ray beam as a result of this
explain the radiopaque zone beneath amalgam restorations
Sn and Zn ions released into underlying demineralised dentine increasing its radiodensity leading to radiopacity as normal dentine either side may appear more radiolucent
mach band effect
optical illusion caused by the retina that can differentiate structures at their boundaries
how is caries viewed on a radiograph
caries is round and not well defined - ‘fuzzy’ around the margins
what can sometimes be seen near roots of upper incisors
a faint circular area towards the apical half of the roots due to the incisive foramen
y of ennis
radiographic feature due to superimposition of the nasal cavity floor and the border of the maxillary sinus
where is y of ennis usually found
on intra oral periapicals of upper canines
occlusal views
intraoral technique using receptor placed in the occlusal plane
examples of upper occlusal views
- anterior oblique maxillary
- lateral oblique maxillary
