Enamel Flashcards
High mineral content renders it hard but brittle
Enamel
Cylindrical in shape and made up of crystal that run in the general direction of the longitudinal axis of the rod
Rod
Surround each rod and its crystals are oriented in a direction different from those making up the rod
Interrod
Narrow space containing organic material seen at the boundary of the rod and interrod
Rod sheath
Series of lines that extend from the dej toward the surface
Striae of Retzius
Periodic bands at 4mm interval across rods
Cross striations
An optical phenomenon produced by changes in direction of adjacent rods
Bands of hunter and schreger
Seemingly twisted enamel rods found at the cusp of teeth
Gnarled enamel
From DEJ to a short distance into enamel
Enamel tufts
Extend from the enamel surface to varying depths of enamel
Enamel Lamellae
Scalloped profile formed when some odontoblast extend into the ameloblast layer and become trapped within when enamel formation begins
Dentinoenamel junction
Area where crystal of dentin and enamel intermix
Enamel spindles
Shallow furrow seen in the enamel surface where striae of retzius end
Perikymata
Structureless surface layer seen in the unerupted teeth and is lost rapidly by abrasion, attrition and erosion in erupted teeth
Final enamel
Debris from the EO that is rapidly as the tooth erupts
Pellicle
