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Tema: Dentinogeneza. Structura dentinei. Pulpa dintelui.

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Tema: Dentinogeneza. Structura dentinei. Pulpa

dintelui.

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Stuctura odontoblastului

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Fibrele de colagen.

• 1. tubulii dentinali

• 2 şi 4 fibre de colagen dispuse tangenţial (fibrele Ebner)

• 3 şi 5 fibre de colagen dispuse în formă “de evantai”(dentina mantiinică)

• I. Dentina mantiinică

• III. Dentina circumpulpară

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Tubuli dentinali

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Porţiunile terminale ale tubulilor dentinali pătrund în joncţiunea dentinocementală

(ramificaţii majore)

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Ramificaţii fine

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Dentina mantiinică Smalţ – liniile Retzius

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Tipurile de dentină în funcţie de modelul de mineralizare:

• 1. predentina

• 2. dentina globulară

• 3. dentina interglobulară

• 4. stratul granular Tomes

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Predentina

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Odontoblaste, predentina, prelungirile odontoblastice Tomes, calcosferiţi

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Dentina interglobulară străbătută de tubulii dentinali

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Dentina interglobulară

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Ciment. Stratul granular Tomes. Dentina radiculară.

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Stratul granular Tomes

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Tipurile de dentină în funcţie de modelul de dezvoltare:

• 1. dentină primară

• 2. dentină secundară

• 3. dentină terţială

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Dentina secundară Dentina primarăSmalţ

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Dentina primară

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Dentina reparativă (iregulată)Pulpa

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Dentina reparativă

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Dentina reparativă

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Dentina colorată cu argint

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Secţiune transversală a tubulilor dentinali. Necolorat

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Secţiune transversală a tubulilor dentinali. Argint

Apofizele odontoblastelor

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Secţiune transversală a tubulilor dentinali. Hematox.-Eoz.

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Apofizele dentinoblastelor

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Liniile de creştere

• 1. liniile de creştere zilnică

• 2. liniile von Ebner

• 3. liniile de contur Owen

• 4. linia neonatală

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Liniile von Ebner au traiect orizontal, aproximativ sub unghi drept

faţă de tubulii dentinali (verticali)

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Liniile Owen în dentinăLiniile Retzius în smalţ

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Liniile Owen

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Pulpa

DentinaDentina

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Zonele pulpei dentare

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Denticuli în pulpa dintelui


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