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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)
HISTOARHITECTONIA SMALULUI
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HISTOARHITECTONIA SMALULUI
Smal imagine de ansamblu-jonciune amelo-dentinar, lamele, fisuri(dinte lif, x 200)
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HISTOARHITECTONIA SMALULUI
Smal imagine de ansamblu;linii Retzius, perikimata, fisur(dinte lif, x 200)
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HISTOARHITECTONIA SMALULUI
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The University of Southern California,School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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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HISTOARHITECTONIA SMALULUI
Smal imagine de ansamblu;lamel cu traiect liniar, tufe suprajacent jonciunii amelodentinare(dinte lif, x 100)
8/2/2019 Dinte 1
8/27
The University of Southern California,
School of Dentistryhttp:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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
HISTOARHITECTONIA SMALULUI
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.
8/2/2019 Dinte 1
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HISTOARHITECTONIA SMALULUI
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
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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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The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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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HISTOARHITECTONIA SMALULUI
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.
The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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.
8/2/2019 Dinte 1
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The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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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The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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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HISTOARHITECTONIA SMALULUI
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.
The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
8/2/2019 Dinte 1
18/27
HISTOARHITECTONIA SMALULUI
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.
The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
8/2/2019 Dinte 1
19/27
Smal imagine de ansamblu; aspect caracteristic conferitde dispoziia prismelor, strii Retzius(dinte lif, x 200 - filtru)
HISTOARHITECTONIA SMALULUI
S O C O S
8/2/2019 Dinte 1
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HISTOARHITECTONIA SMALULUI
Benzi Hunter-Schreger(dinte lif, x 200 - filtru)
HISTOARHITECTONIA SMALULUI
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HISTOARHITECTONIA SMALULUI
Strii Retzius paralele, sub form de inele concentrice(dinte lif, x 200 - filtru)
HISTOARHITECTONIA SMALULUI
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HISTOARHITECTONIA SMALULUI
Striaii transversale periodice, dispuse perpendicular
pe axul longitudinal al prismelor(dinte lif, x 400)
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The University of Southern California, School of Dentistry
http:\\www.usc.edu/hsc/dental/ohisto
HISTOARHITECTONIA SMALULUI
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
http:\\www.usc.edu/hsc/dental/ohisto
8/2/2019 Dinte 1
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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
http:\\www.usc.edu/hsc/dental/ohisto
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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
http:\\www.usc.edu/hsc/dental/ohisto
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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
http:\\www.usc.edu/hsc/dental/ohisto
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