Post on 27-Jul-2015
description
Dr. Ahmad R. Awad
The Enamel
The age development
The Dentin
The Pulp
The Bone
The cementum
The periodontal ligaments
أسرة الفيروز
The tooth development
End
Ectoderm which lie the oral cavity
Outer enamel epithelium Inner enamel
epithelium
Dental papilla
Tooth follicle
Stallat Reticulum
Dental lamina
Enamel organ ( in bud stage)
E.ON.B: In the cap stage the inner enamel epithelium separate from the dental papilla via space called cell free zone.
Dental papilla which becomes pulp
Predentin
Dentin
enamel
Ameloblastic layer
Stratum intermedium
Odontoblastic layer
Stallat reticulum
Dental papilla
Odontoblastic layer
predentin
dentinEnamel Ameloblastic layer
Stallat reticulum
Cervical loop
Dentin A.D.J.
Enamel lamella type B
Incremental line of Retzuz’s
Enamel lamella type C
Dentin
Enamel
Enamel spindle
Enamel tufts
A.D.J
Enamel lamella type B
Enamel lamella type C
Primary curvature of the dentinal tubules
Foamy shaped odontoblasts
Predentin
Dentin
cementum
Granular layer of Tome’s
Inter globular space
Dentinal tubules
White star shaped structure ( dentin inter globular spaces.) in decalcified section.
Dentinal tubules
Granular layer of tome’s
Incremental lines of Salter (in cementum)
Acellular cementum
Granular layer of Tome’s
Dentinal tubules
Cellular cementum characterized by the lacunea and the canaliculi of the cemntocytes
Decalcified section showing the cellular cementum
Root at the apical portion
N.B: This section just cellular cementum it is not hypercementosis. To differentiate between both note the bulky cementum at the apical part of the root.
Pulp core
Cell reach zone
Cell free zone
Odontoblastic layer
Predentin
Pulp horn
Predentin
Dentin
Pulp core
Pulp core
Odontoblastic layer
Predentin
Hyaline cartilage with the chondroblasts embed in matrix
Bone
Bundle bone
Lamellar bone
spongiosa
Developed root
Spongiosa
Alveolar bone proper ( bundle + lamellar bone)
N.B: There are a structures in the alveolar bone proper called (Zuker Kandle and Hirschfield canals ) but they can't seen by the light microscopes.
Spongy bone
Interradicular fibers
Interradicular septum of bone
Oblique fibers
N.B: To inspect the type of fibers erect on the direction of their nuclei
Apical fibers
Oblique fibers
Horizontal fibers
Inter dental or ( trans septal ) fibers
Gingival fibers
Interstitial spaces rich with blood vessels and nerves .
Periodontal ligament fibers
The age change of dentinThe age change of dentin
Primary dentin
( According to the severely of stimulus )
Sclerotic Dead tracts
Secondary dentin
Regular
Irregular
-Reparative
- atubular
-Osteodentin
The age change in pulpThe age change in pulp
Localized
True denticles False denticles
- Small - Large
- Root canal - In the pulp
- Have few tubules
Diffused
Irregular reparative secondary dentin
Predentin
Pulp
Dead tract in primary dentin
N.B : The dead tracts have an optical phenomenon that it showing black lines in transmitted light and white once when the light turned off. But it is difficult to taken a picture when the microscope turned off.
False denticles ( pulp stone) in the pulp chamber