Enamel composition and structure

0 9
Mind Map by 0 9, updated more than 1 year ago
0 9
Created by 0 9 about 4 years ago
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dentistry Oral Biology (Tooth development) Mind Map on Enamel composition and structure, created by 0 9 on 11/11/2015.

Resource summary

Enamel composition and structure
1 Physical properties
1.1 Hardest substance in the human body
1.2 Brittle - underlying dentine supports the enamel
1.3 Regional variations - surface enamel is the hardest and thickest. Vertical orientation of enamel near surface therefore more resistant to masticatory forces.
1.4 Age variations - enamel translucency increases with age, shows underlying dentin
2 Chemical properties
2.1 96% by weight inorganic matrix - Hap crystals; long crystallites. F- substitution increases stability against acid dissolution.
2.2 Remaining weight is organic matrix, consisting of...
2.2.1 Amelogenins - 90% of the organic content, facilitates crystal growth during maturation
2.2.2 Non-amelogenins
2.2.2.1 Ameloblastin
2.2.2.2 Enamelin
2.2.2.3 Also involved in crystal growth
2.2.3 In immature enamel, nearly 30% wt is organic content
3 Structure and structural features
3.1 Basic unit - prism
3.1.1 Reflects path of ameloblast from ADJ to surface - 1:1 ratio
3.1.2 T/F - are prisms present in enamel close to ADJ and surface? F because aprismatic enamel found here due to lack of PTP + DTP when it was secreted therefore aprismatic (reflects start and end of secretory stage)
3.2 Apperance in microscopy
3.2.1 LM - fish scales, key hole, etc
3.2.2 SEM - interrod / rod orientations apparent
3.3 Hunter-Schreger bands - cause by changes in direction of adjacent groups of rods = light reflects differentially as dark+light bands
3.4 Enamel lamellae - linear structure going into various depths of enamel - filled with organic material
3.5 Enamel spindles - odontoblast process embedded in enamel after enamel matrix is mineralised
3.6 Enamel tufts - branches structures going into enamel at ADJ
3.7 ADJ appearance - scalloped = increase SA for
3.8 Striae of Retzius - incremental growth lines, successive aposition of layers of enamel. Appears at surface of enamel as perikymata.
3.9 Gnarled enamel - rod "twisting" due to difference in orientation of groups of rods/prisms - undulations near cusp region
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