01.dezvoltarea dentara
TRANSCRIPT
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COROANACOROANA
COLETULCOLETUL
RĂDĂCINARĂDĂCINA
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Componentele dure:
• SMALŢULSMALŢUL
• DENTINADENTINA
• CIMENTULCIMENTUL
Componenta moale:
• PULPA DENTARĂPULPA DENTARĂ
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MUGUREMUGURE DENTARDENTAR Stadiul de CAPISONStadiul de CAPISON
Stadiul de CLOPOTStadiul de CLOPOT Finalizarea FORMĂRII Finalizarea FORMĂRII COROANEICOROANEI
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MUGURE DENTARMUGURE DENTAR
Mugurele dentarMugurele dentar - viitorul organ –
al smalţului
Celulele Celulele ectomezenchimaleectomezenchimale – viitoarea papilă -
dentarăCelulele ectomezenchimaleCelulele ectomezenchimale
- viitorul sac dentar -
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ORGANUL SMALŢULUIORGANUL SMALŢULUI
1
2
3Organul smalţului este constituit:1. Epiteliul extern2. Epiteliul reticular3. Epiteliul intern
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NODULNODUL SMALŢULUISMALŢULUI
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CORDONUL SMALŢULUICORDONUL SMALŢULUI
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ETAPA DE HISTO şi MORFODIFERENŢIERE. ETAPA DE HISTO şi MORFODIFERENŢIERE. STADIUL DE CLOPOTSTADIUL DE CLOPOT
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ORGANUL SMALŢIANORGANUL SMALŢIAN
Este format din 4 epitelii:
1. Epiteliul extern
2. Epiteliul reticular
3. Epiteliul intermediar
4. Epiteliul intern
1.1.
2.2.
3.3.
4.4.
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1.1. 3.3.
2.2.
4.4.
ORGANUL SMALŢIANORGANUL SMALŢIAN
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EPITELIUL INTERNEPITELIUL INTERN al organului smalţian
ODONTOBLASTEPREAMELOBLASTE
induc diferenţierea
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Dentinogeneza incipientă are loc iniţial în regiunea incizală, apoi în ariile laterale
PULPA DENTARĂ
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SFÂRŞITUL STADIULUI DE CLOPOTSFÂRŞITUL STADIULUI DE CLOPOT
Se caracterizează prin:
-apariţia dentinei
-apariţia smalţului
-Transformarea papilei dentare în PULPĂ DENTARĂ
-Debutul proceselor formative cu origine în sacul dentar
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Prin proliferarea epiteliocitelor lamelei dentare se formează lamela succesională – punct de origine a dintelui permanent
LAMELA SUCCESIONALĂLAMELA SUCCESIONALĂ
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DEGENERAREA LAMINEI DENTAREDEGENERAREA LAMINEI DENTARE
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ETAPA APOZIŢIE. DETERMINAREA FORMEI ETAPA APOZIŢIE. DETERMINAREA FORMEI COROANEI DINTELUICOROANEI DINTELUI
• dentina şi smalţul se depun în manieră apoziţională, prin perioade de activitate şi de repaus
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ETAPA APOZIŢIE. DETERMINAREA FORMEI ETAPA APOZIŢIE. DETERMINAREA FORMEI COROANEI DINTELUICOROANEI DINTELUI
Prin depunerea DENTINEIDENTINEI şi SMALŢULUISMALŢULUI se formează COROANA DENTARĂCOROANA DENTARĂ
CENTRUL DE CREŞTERE
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ANSA CERVICALĂANSA CERVICALĂ
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TEACA EPITELIALTEACA EPITELIALĂĂ HERTWIG HERTWIG
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TEACA EPITELIALTEACA EPITELIALĂĂ HERTWIG HERTWIG
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TEACA EPITELIALTEACA EPITELIALĂĂ HERTWIG HERTWIG şi DIAFRAGMUL EPITELIALDIAFRAGMUL EPITELIAL
DIAFRAGMUL EPITELIAL
TEACA EPITELIALĂ HERTWIG
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PREPARATELE HISTOLOGICE
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PERIKIMATAPERIKIMATA
Liniile RETZIUS
PERIKIMATA
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LAMELELE SMALŢULUILAMELELE SMALŢULUI
l – lamelă; e – smalţ; d - dentină
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LAMELELE SMALŢULUILAMELELE SMALŢULUI
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JONCŢIUNEA AMELODENTINARĂJONCŢIUNEA AMELODENTINARĂ
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JONCŢIUNEA AMELOCEMENTARĂJONCŢIUNEA AMELOCEMENTARĂ
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TUFELE SMALTULUI TUFELE SMALTULUI
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TUFELE SMALTULUI TUFELE SMALTULUI
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FUSURILE SMALFUSURILE SMALŢULUIŢULUI
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FUSURILE SMALFUSURILE SMALŢULUIŢULUI
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BENZILE BENZILE HUNTER-SCHREGERHUNTER-SCHREGER
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SMALSMALŢ NODUROSŢ NODUROS
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STRIAŢIILE PRISMELOR SMALŢIENESTRIAŢIILE PRISMELOR SMALŢIENE
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LINIILE RETZIUSLINIILE RETZIUS
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LINIA NEONATALĂLINIA NEONATALĂ
A- smalţ noduros; B – linia neonatală; C – dentina; D – joncţiunea amelodentinară
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ODONTOBLASTULODONTOBLASTUL
Prelungirea TOMES
Corpul celulei
Dentina manta
Dentina circumpul
pară
Predentina
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TUBULUL DENTINARTUBULUL DENTINAR
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RAMIFICAŢIILE TUBULILOR RAMIFICAŢIILE TUBULILOR DENTINARIDENTINARI
Deosebim 3 tipuri:
1. Majore
2. Fine
3. Microtubuli sau canaliculi
RAMIFICAŢIILE MAJORERAMIFICAŢIILE MAJORE
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Secţiune transversală a tubulilor dentinali. Ramificaţiile fine.
RAMIFICAŢIILE TUBULILOR RAMIFICAŢIILE TUBULILOR DENTINARIDENTINARI
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1-spatiile libere reprezinta tubulii dentinari, inconjurati de un 2-inel fin de dentina peritubulara, in exteriorul caruia este localizata 3-dentina intertubulara
1122
33
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DENTINA MANTADENTINA MANTA
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DENTINA CIRCUMPULPARĂDENTINA CIRCUMPULPARĂ
PULPA
DENTINA CIRCUMPULPARĂ
PERIODONT
•Reprezintă aria cea mai importantă de dentină, delimitând camera pulpară
•Prezintă un grad crescut de mineralizare
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DENTINA GLOBULARĂDENTINA GLOBULARĂ
Apare ca urmare a procesului normal de mineralizare a matricei organice dentinare
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DENTINA INTERGLOBULARĂDENTINA INTERGLOBULARĂ
reprezintă arii de matrice organică hipomineralizată sau complect nemineralizată
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STRATUL GRANULAR TOMESSTRATUL GRANULAR TOMES
localizat în zona radiculară, paralel cu joncţiunea dentinocementară
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Dentina secundară Dentina primară Smalţ
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DENTINA PRIMARĂ ŞI CEA SECUNDARĂDENTINA PRIMARĂ ŞI CEA SECUNDARĂ
DENTINA PRIMARĂ
DENTINA SECUNDARĂ
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DENTINA REPARATIVĂDENTINA REPARATIVĂ
DENTINA REPARATIVĂ
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•Tubulii dentinari scad numeric, sunt complect dezorganizaţi şi dezordonaţi ca aranjament, orientaţi la întâmplare.
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LINIILE VON EBNER
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LINIILE OWENLINIILE RETZIUS