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Smal edificat ameloblaste n stadiu protector(seciune demineralizat, HE, x 400)

Primul strat de smal depus deasupra dentinei

(seciune demineralizat, Szekely, x 400)

HISTOARHITECTONIA SMALULUI

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Ameloblaste cu margine neted

(seciune demineralizat, HE, x 400)

Ameloblaste cu marginencreit(seciunedemineralizat, HE, x 400)

Jonciunea dintre ameloblaste i smal,

cu aspect de gard n rui

(seciune demineralizat, Szekely, x 1000)


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Smal imagine de ansamblu-jonciune amelo-dentinar, lamele, fisuri(dinte lif, x 200)

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Smal imagine de ansamblu;linii Retzius, perikimata, fisur(dinte lif, x 200)

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The University of Southern California,School of Dentistry

http:\\www.usc.edu/hsc/dental/ohisto


Enl_002

The Dentinoenamel JunctionEnamel tissue with incremental linesof Retziusand dentin tissue with parallel, curveddentinaltubules are in contact at the irregulardentino-enamel junction. The junctionoften has ascalloped-shaped morphology.Longitudinalground section. Magnification 40x.

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Smal imagine de ansamblu;lamel cu traiect liniar, tufe suprajacent jonciunii amelodentinare(dinte lif, x 100)

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The University of Southern California,

School of Dentistryhttp:\\www.usc.edu/hsc/dental/ohisto


Enl_006Enamel LamellaeThe enamel lamellae appear as longitudinal cracks in the enamel(some arecracks) that sometimes extend into the dentin. Transverse groundsection.Magnification 100x.

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The University of Southern California, School of

Dentistryhttp:\\www.usc.edu/hsc/dental/ohisto


Enl_014Hunter-Schreger BandsHunter-Schreger bands appear as alternating light and darkbands in lightmicroscopy. They are best observed in polarized orreflected light. What isthe underlying basis for the appearance of this

phenomenon? Longitudinal

ground section. Magnification 40x.

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Jonciunea amelodentinar cu aspect n solzi de pete,

fusuri, benzi Hunter-Schreger

(dinte lif, x 400)

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The University of Southern California, School of Dentistry



Enl_009Enamel SpindlesThe enamel spindles appear as short, straight, thin, dark structureswhichextend for only short distances into enamel. They are residualtubules formedwhen odontoblastic processes extend across the dentinoenamel

junctionduring odontogenesis. In ground sections, the odontoblasticprocessesdisintegrate and are replaced by air which appears dark intransmitted light.Transverse ground section. Magnification 100x.

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Enl_011Enamel SpindlesThe enamel spindles appear as short, straight, thin,

dark structures whichextend for only short distances into enamel. Theyare residual tubules formedwhen odontoblastic processes extend across thedentinoenamel junctionduring odontogenesis. In ground sections, theodontoblastic processesdisintegrate and are replaced by air which appearsdark in transmitted light.

Transverse ground section. Magnification 200x.

Enl_010Enamel SpindlesThe enamel spindles appear as short, straight, thin, darkstructures which extendfor only short distances into enamel. They are residual

tubules formed whenodontoblastic processes extend across the dentinoenameljunction duringodontogenesis. In ground sections, the odontoblasticprocesses disintegrate andare replaced by air which appears dark in transmitted light.Transverse groundsection. Magnification 200x.

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Smal tufele smalului(dinte lif, x 200)

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Enl_007

Enamel Tufts

Several enamel tufts, which appear as wavy

groups of enamel rods, extend from the dentinoenamel junction into enamel

to about one quarter of its

thickness. Transverse ground section.Magnification 100x.




Enl_008Enamel TuftsSeveral enamel tufts, which appear as wavy groups of

enamel rods, extendfrom the dentinoenamel junction into enamel to about onequarter of itsthickness. Transverse ground section. Magnification 200x.

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Enl_004EnamelCurved enamel prisms which arepresent in successive layers of enamelappear to intertwine. In some areas of

the enamel, rod striations are visible inthe enamel rods. The enamel rods areoriented vertically in thephotomicrograph. Ground section.Magnification 100x.

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Enl_003EnamelCurved enamel prisms which are present insuccessive layers of enamel

appear to intertwine. In some areas of the enamel, rodstriations are visible inthe enamel rods. The enamel rods are orientedvertically in thephotomicrograph. Ground section. Magnification 100x.

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Enl_012

Gnarled Enamel

Bundles of enamel rods appear to intertwine in ahighly irregular manner in

the cusp region of teeth to form gnarled enamel. Thephenomenon of gnarled

enamel appears to be an optical illusion. Longitudinalground section.

Magnification 40x.



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Enl_013

Gnarled Enamel

Bundles of enamel rods appear to intertwinein a highly irregular manner in

the cusp region of teeth to form gnarledenamel. The phenomenon of gnarled

enamel appears to be an optical illusion.Longitudinal ground section.

Magnification 40x.



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Smal imagine de ansamblu; aspect caracteristic conferitde dispoziia prismelor, strii Retzius(dinte lif, x 200 - filtru)


S O C O S

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Benzi Hunter-Schreger(dinte lif, x 200 - filtru)


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Strii Retzius paralele, sub form de inele concentrice(dinte lif, x 200 - filtru)


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Striaii transversale periodice, dispuse perpendicular

pe axul longitudinal al prismelor(dinte lif, x 400)

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Enl-005EnamelHigher power of the previous image. The rodstriations of the enamel prisms

are more evident at this power. Ground section.Magnification 400x.

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DENTIN

16. Mantle DentinThe peripheral layer of dentin, which is the first layer of dentin deposited, is

called mantle dentin. It is located adjacent to the enamel in the crowns ofteeth and adjacent to the cementum in the roots. Notice the lines ofRetzius in the enamel which are oriented at an angle to the dentinoenameljunction.

Longitudinal ground section. Magnification 100x

The University of SouthernCalifornia, School ofDentistry


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DENTIN

17. Primary and Secondary DentinThe dentinal tubules scribe an S-shape pattern. Primary dentin occupies the major area of

the photomicrograph. A demarcation line (located toward the left border of the frame)clearly delineates the primary dentin from the more irregular secondary dentin. Asmall section of enamel is visible at the right ofthe field.

Longitudinal ground section. Magnification 40xThe University of Southern California, School

of Dentistry


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Primary and Secondary Dentin

Dentin_018Primary DentinHigher power of frame 17. Longitudinal ground section.

Magnification 100x.

The University of Southern California, Schoolof Dentistry


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DENTIN

19. Primary Dentin, Demarcation Line, Secondary Dentin Higher power of frame 17. Longitudinal ground

section. Magnification 100x

The University of Southern California, Schoolof Dentistry


Date post:	05-Apr-2018
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