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29 Cards in this Set

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  • Back
Hardest substance in the body and is approximately 90% mineral, has the greatest absorption of x-rays. More RO than bone bc of the thickness and density. The DEJ shows lines of contrast bw the enamel and dentin.
is approximately 75% mineralized and radiographic appearance is similar to bone because of its lower mineral content
has a mineral content of approximately 50% - not usually seen on a radiograph bc the contrast bw it and dentin is low
noncalcified tissue that is more RL than dentin
not visible radiographically but is in the space between the tooth and the lamina dura
thin layer of compact alveolar bone that lines the tooth socket
lamina dura
appears as a thin RO line around the root which allows nerve and vessels to reach PDL and cementum
lamina dura
normal level is 1.5mm to 2.0mm from the CEJ, part is continuous with the lamina dura and forms a sharp angle with it
alveolar crest
dense outer layer of bone and is without marrow spaces
cortical bone
resists passage of x-rays and is RO - examples: inferior border of mandible, crests of alveolar process, and lamina dura
cortical bone
bone marrow between two layers of cortical bone
cancellous bone
cancellous bone appears how on a radiograph?
trabeculation patterns will appear RO and RL, however it is mainly RL
projection of bone
example: coronoid
linear projection of bone
sharp projection of bone
small bump on bone
rounded prominence of bone
passageway in boen tat contains nerve, artery and vein
opening in bone that permits passage of nerve and vessels
depressed area in bone
hollow space of cavity in bone
immovable joint that is a line of union b/w adjoining bones of the skull - only found in skull and appear as a RL line
nasolabial fold
soft tissue shadow that extends from the ala of the nose to the corner of the lip
bone pattern of anterior maxilla
thin and numerous trabeculae, forming a fine, relatively rounded, dense pattern
smaller bone marrow spaces, fine trabeculation
bone pattern of posterior maxilla
similar to anterior maxilla, but larger bone marrow spaces
bone pattern of anterior mandible
thicker and fewer trabeculae, forming a coarser pattern, trabecular plates oriented more horizontally, larger bone marrow spaces
bone pattern of posterior mandible
similar but larger bone marrow spaces, mainly horizontally oriented trabeculae, bone area just below the molar roots to the inferior border of the mandible may be devoid of trabeculation.
this appears more RL
RL structure located at the midline of the anterior portion of the hard palate, posterior to the maxillar centrals
incisive foramen
lateral walls of this structure appear as RO lines extending from incisive foramen to the floor of the nasal fossa
nasopalatine canal