Normal Radiographic Anatomy Flashcards
What is required for examination
routine system
controlled environment
good viewing conditions
What is the periodontal ligament space
§ Can be seen next to the root of a tooth where between it and the bone a radiolucent line can be seen
The anatomical feature is the periodontal ligament however we cannot see the fibres in the radiograph so we refer to it as a space
What is the lamina dura
§ It is a linear radiopacity which is part of the bone
§ It represents the tooth socket
The bone of the tooth socket is special and on a radiograph it is referred to as the lamina dura as it can be seen as a thick line
What can be seen in bitewings
enamel dentine pulp canal periodontal ligament space lamina dura alveolar bone pulp chamber
What can be seen in periapicals
follicular space
alveolar crest
submandibular fossa
inferior dental canal
What is the dental follicle
The dental follicle is an ectomesenchymal tissue that surrounds the developing tooth germ
How is the dental follicle seen in a radiograph
it is seen as a normal homogenous radiolucency space around the crown of a developing tooth and is known as the follicular space
What is the alveolar crest
Where lamina dura of 2 tooth sockets meet together with bone going over the top of the crest
Where is the submandibular fossa seen
Can be seen on the lingual side
How does the submandibular fossa appear on a radiograph
It is hollow so the thickness of bone from buccal to lingual is less than higher up
mylohyoid ridge divides it into two parts
How is the inferior alveolar canal seen on a radiograph
§ Radiolucency parallel sided feature
More general radiolucency above it and this is a normal anatomical feature
What are radiolucent normal features
air shadows: oral cavity nasal cavity, orbits maxillary sinus pharynx and larynx inferior alveolar canal, foramina trabecular spaces pterygomaeillary fissure
What are radiopaque normal features
hard tissue: bones (ridges, canals, septa), teeth
soft tissue adjacent to air: tongue, soft palate nasal tissues lips ear lobes
What are anatomical features seen in hard tissues
○ hard (bony) palate ○ nasal septum ○ nasal conchae ○ zygomatic buttress (process) ○ zygomatic arch ○ vertebrae ○ hyoid styloid process
What are anatomical features seen in soft tissues
tongue lips soft palate nasal soft tissues § philtrum § alae ear lobe epiglottis posterior pharyngeal wall
