Oral histology_عملي pptx - د.اسماء

Oral HistologyPractical

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Cemental Repair

Protective function of cementoblasts after
resorption of root dentin or cementum

Resorption of dentin and cementum due

to trauma (traumatic occlusion, tooth
movement, hypereruption)

Loss of cementum accompanied by loss

of attachment

Following reparative cementum

deposition attachment is restored

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A: Acellular cementum

B: Hyaline layer of Hopwell-Smith
C: Granular layer of Tomes
D: Root dentin

Cellular: Has cells

Acellular: No cells and has no structure

Cellular cementum usually overlies acellular cementum

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Development of Cementum

Cementum formation occurs along the

entire tooth

Hertwig’s epithelial root sheath (HERS) –
Extension of the inner and outer dental
epithelium

HERS sends inductive signal to ectomesen-

chymal pulp cells to secrete predentin by
differentiating into odontoblasts

HERS becomes interrupted

Ectomesenchymal cells from the inner portion
of the dental follicle come in with predentin by
differentiating into cementoblasts

Cementoblasts lay down cementum

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Acellular

Cellular

Variations also noted where acellular and cellular reverse in position
and also alternate
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Dentin

GT
Lacuna of cementocyte
Canaliculus
CEMENTUM

Acellular cementum
Cellular cementum
Hyaline layer
(of Hopewell Smith)
Granular layer of tomes
Dentin with tubules

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a) outer cortical platesb) a central spongiosa c) bone lining the alveolus (bundle bone)

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Oxytalan

Berkovitz BK , Holland GR, Moxham BJ.: Color atlas & textbook of oral anatomy. 1978, p115 Fig. 294
Avery JK. Essentials of oral histology and embryology A clinical
approach. 1992, p133 Fig. 11-3
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Osteoclasts
* Large and multinucleated, or small
and mononuclear
* The characteristic multinucleated giant
cells exhibit eosinophilic cytoplasm.
* It occupy in Howship’s lacunae,
or surround the end of a bone spicule
in light microscope.