Which of the following is the correct order?
morphogenesis, histodifferentiation, ruffled membrane, secretion, smooth membrane, reduced enamel epithelium
initial secretion, morphogenesis, histodifferentiation, smooth membrane, ruffled membrane, secretion, reduced enamel epithelium
morphogenesis, initial secretion, histodifferentiation, ruffled membrane, secretion, reduced enamel epithelium, smooth membrane
morphogenesis, histodifferentiation, secretions, ruffled membrane, smooth membrane, reduced enamel epithelium
morphogenesis, histodifferentiation, secretions, smooth membrane, ruffled membrane, reduced enamel epithelium
Which of the following is incorrectly matched?
Morphogenic... cuboidal cells and basement membrane
Histodifferentiation... columnar cells and basement membrane dissolves
Secretory... enamel rods begin to form
Ruffled membrane maturation... allow Ca and phosphate in
Reduction of enamel epithelium... basal lamina created
The interrod enamel is both the first and last type of enamel to be laid down. Most of the enamel matrix protein is Ameloblastin
Both true
True, false
False, true
Both false
Which of the following is incorrect?
Amelogenin... limits lateral extension
Ameloblastin...ameloblast adherence to enamel matrix
MMP20- degrades amelogenin and ameloblastin
Kallikren 4- expressed in early secretory phase
none of the above
The DEJ has the most stress and therefore the least hardness. The greatest hardness can be found at the cusp tips due to greater mineralization and activity of matrix removal.
Striae of Retzius come from variations of enamel rod directions. Hunter Schreger bands are perpendicular to DEJ and enamel surface.
Which of the following is correctly matched?
Enamel tufts... branch from DEJ into enamel surface
Enamel lamellae... run from DEJ to enamel matrix
Enamel spindles... are odontoblastic processes most often seen at cusp tips
Hunter Schreger bands... are concentric
Striae of Retzius... are perpendicular to DEJ
