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Histology chapter 12.txt
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Sheets of abnormally crystallized enamel-longer and mor narrow than enamel tufts
Enamel lamellae
Areas of abnormally crystlized enamel near the DEJ
Enamel tufts
Dentinal tubules within enamel -near DEJ
Enamel spindles
Prominent line of Retzius-indicated stress @ birth
Neonatal line
T/F: what is the reason we acid the enamel struture of a tooth
To remove some of the organic material - roughen the surface for better retention
The grooves between the imbrication lines - ridges themselves
Perikymata
Parallel buccal ridges near the CEJ of the upper anteriors. Usually rough
Imbrication lines
Cross striations on the enamel rods that correspond to growth rings - stain brown
Lines of Retzius
Type of fluoride that only works if taken internally and only works @ the pre-eruptive stage
Systemic flioride
Direct contact fluoride;only works on erupted teeth
Topical fluoride
Caused by excessive intake of fluoride-gives teeth a mottled appearance
Fluorosis
T/F: Systemic fluoride can help enamel that is already matured and hardened
True
False
False: systemic flouride only works on pre erupted teeth
Crystalline building block of enamel
Enamel rod
It takes____ameloblast to produce 1 enamel rod
4
The ratio of ameloblast to enamel rods
4:1
FYI:
Each enamel rod extends from the DEJ to the outer surface of the tooth
2. Each rod is 90* to the DEJ and curves slightly toward the outer surface
3. The key hole shape locks the roda together
Scalloped border that is seem microscopically mature enamel
Dentoenamel junction
DEJ
On the DEJ the ___side is toward the dentin and the ___side is toward the enamel
Convexed
Concaved
Enamel matrix becomes heavily mineralized during this stage
Matutation
What happens to the ameloblast after apposition and mineralization occurs
They become part of the reduced enamel epithelium
2 developmental disturbances that occur during the apposition stage
Enamel pearls
Enamel displasia
Begins in pits and grooves of the tooth-always larger than it appears on xray-usually not visible until it reaches the DEJ
Caries
Hardest calcified tissue of the human body
Enamel
Composition of enamel
96% calcium hydroxyapatite
(non organic)
3% water
1% organic material (cells)
T/F: enamel is a vital tissue-it has blood supply and nerves
True
False
False: enamel is non vital and it has no nerves or blood supply
Can enamel regenerate or repair itself
No it can not
Mechanical wear on facial surface - tooth fractures from gumline...caused from hitting too hard on opposing tooth
Abfraction
Tooth to tooth wear on the incisal or occlusal surfaces-bruxium
Attrition
Chemical damage of the enamel
Erosion
2 causes of erosion
Acidic foods - facial surface
Stomache acid - throwing up lingual surface
Enamel forming cell
Ameloblast
Process of enamel formation
Amelogenesis
Enamel secreting surface of ameloblast - faces the DEJ
Tome's process
First stage of enamel formation
Emelogensis
Only partially mineralized @ start
Begins formation @ insical edge or cusp tip
Enamal matrix
Is produced by living cells but is non vital itself
Enamel
T/F: enamel is the only part of a tooth that can be seen clinically
True
False
True
Author
tigermom23
ID
19130
Card Set
Histology chapter 12.txt
Description
histo chapt 12
Updated
2010-05-13T03:56:47Z
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