آناتومی رادیوگرافی طبیعیnormal radiographic anatomy

آناتومی رادیوگرافی طبیعیnormal radiographic anatomy

اسلاید 1: ormal radiographic anatomyآناتومی رادیوگرافی طبیعی

اسلاید 2: Normal Radiographic Anatomy The radiographic recognition of disease requires a sound knowledge of the radiographic appearance of normal structures. Intelligent diagnosis mandates an appreciation of the wide range of variation in the appearance of normal anatomic structures. most patients demonstrate many of the normal radiographic landmarks, but it is a rare patient who shows them all. Accordingly, the absence of one or even several such landmarks in any individual should not necessarily be considered abnormal.

اسلاید 3: Normal Radiographic Anatomy: TEETH Teeth are composed primarily of dentin, with an enamel cap over the coronal portion and a thin layer of cementum over the root surface.

اسلاید 4: TEETHThe enamel cap characteristically appears more radiopaque than the other tissues because it is the most dense naturally occurring substance in the body. Being 90% mineral, it causes the greatest attenuation of x-ray photons. The dentin is about 75% mineralized, and because of its lower mineral content its radiographic appearance is roughly comparable to that of bone. The thin layer of cementum on the root surface has a mineral content (50%) comparable to that of dentin. Cementum is not usually apparent radiographically because the contrast between it and dentin is so low and the cementum layer is so thin.

اسلاید 5:

اسلاید 6: Normal Radiographic Anatomy: TEETH The pulp of normal teeth is composed of soft tissue and consequently appears radiolucent. The chambers and root canals containing the pulp extend from the interior of the crown to the apices of the roots. Although the shape of most pulp chambers is fairly uniform within tooth groups, great variations exist among individuals in the size of the pulp chambers and the extent of pulp horns.