SAS 4 Clinical Significance of Oral Anatomy, Histology,Physiology and Occlusion to Operative Dentistry Flashcards
is formed by cells called ameloblasts, which originate from the embryonic germ layer known as an ectoderm.
Enamel
have short extensions toward the dentinoenamel junction (DEJ); these are termed Tomes processes.
Ameloblasts
The building structures or blocks of enamel are called
Enamel rods
appear like “keyholes” or paddle shaped.
Enamel rods
are entwined rods with adjacent groups of rods, which follows a curving irregular path toward the tooth surface
Gnarled enamel
These bands appear to be composed of alternate light and dark zones of varying widths that have slightly different permeability and organic content.
Hunter schreger bands
hypomineralized structures of enamel rods and inter-rod substance that project between
adjacent groups of enamel rods from the DEJ. May play a role in the spread of dental caries.
Enamel tufts
are thin leaf-like faults between enamel rod groups that extend from the enamel surface to DEJ sometimes into the dentin.
Enamel lamellae
contain mostly organic material, which is a weak area
predisposing a tooth to the entry of bacteria and dental caries.
Enamel lamellae
originate from the DEJ, may serve as pain receptors, explaining the enamel sensitivity experienced by some patients during tooth preparation.
Enamel spindles
the interface of the enamel and dentin.
Dentino enamel junction DEJ
It is scalloped or wavy in outline, with the crest of the waves penetrating toward the enamel.
DEJ
is formed by cells called odontoblasts.
Dentin
is the dentin forming the initial shape of the tooth
Primary dentin
is characterized by a slower rate of deposition and an abrupt change in the direction of the dentinal tubules.
Secondary dentin
