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Enamel Prisms (Rods)
Mineralized crystalline structure of enamel. Extends width of enamel from DEJ to outer surface. Perpendicular to DEJ. "Keyhole shape", largest mass
Water and Matrix present. Formed by ameloblasts. Interprismatic or Interrod region covers rod/prism.
There are two groups of matrix proteins (Amelogenins and Enamelins). Ameloblasts lay matrix but then break it down to allow room for hydroxyapatite
Enamel Protective Stage
Enamel complete so enamel organ is now reduced enamel epithelium. Reduced enamel epithelium covers and protects new enamel prior to eruption. Ameloblasts secrete basal lamina to cover enamel (important in establishment of DGJ).
Taking enamel and cutting it cross-sectional and longitudinal and laying those 2 cuts next to each other. Band appearance
Runs from DEJ to very outside. Fracture line. Only seen microscopically. Sensitivity because tubules are open to outer environment.
Found from DEJ to inner 1/3 of enamel. May be calcified or not. Resembles bundles of grass. Bigger than spindles.
Develop when odontoblastic processes are not withdrawn quickly. Tiny. Non-calcified enamel. Located next to DEJ.
Length of rods and tubules are irregular. Scalloped ridge increases adherence and strength. Prismless area.
Pre-Eruptive Calcification Stage
Fluoride is deposited during formation of Enamel crystals and incorporated as fluorapatite. Benefit from systemic fluoride.
Pre-Eruptive Maturation Stage
Fluoride Deposition continues after calcification. Benefit from systemic fluoride.
After eruption and throughout life of teeth. Topical uptake and rapid uptake during 1st years after eruption.
Types of developmental lines
1. Cross Striations 2. Incremental Lines 3. Lines of Retzius (Neonatal)
Fluoride takes away
Hydroxy ion which was becoming demineralized and replaces it with the fluoride ion and you now have fluorapatite.
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