Dentin

Tameyra Stefani Al-Suhairy · 44問 · 1年前

通報

問題一覧

are specialized connective tissues of mesodermal origin, formed from the dental papilla of the tooth bud

dentin and pulp tissues

• Forms the largest portion of tooth structure. • Normally, yellow white slightly darker the enamel

dentin

Externally,It is covered by enamel on the anatomical crown and by cementum on the anatomical root.

dentin

• Internally, ___ forms the wall of the pulp cavity (PULP CHAMBER AND PULP CANAL)

dentin

Provides the bulk and general form of tooth. 2. Determines the shape of the crown. 3. Protection of the brittle enamel

dentin

4 odontogenesis

Histodifferentiation, Matrix Formation, Mineralization, Maturation

1. Ectomesenchymal cells elongate 2. Organelles increase in the cells 3. Odontoblastic process appears

Bell stage

ectomensenchymal cells proliferate

Bud and cap stage

PREDENTIN FORMATION 1. COLLAGEN protein synthesis in rER of odontoblasts 2. The proteins are packaged into vesicles in golgi complex 3. Vesicles migrate to the area of odotoblastic process 4. Release of secreted protein outside the cell through exocytosis

Apposition stage

GLOBULAR AND LINEAR CALCIFICATION

MINERALIZATION

1. HA in Globules or calcospherules 2. Globules expand and fuse together

GLOBULAR CALCIFICATION

Crystals are deposited in linear direction

LINEAR CALCIFICATION

or imbrication lines, appear as fine lines or striations in dentin. - run at right angles to the dentinal tubules.

incremental lines of von Ebner

These lines reflect the 5-day rhythmic, recurrent deposition of dentin matrix as well as hesitation in the daily formative process (20 microns)

incremental lines of von Ebner or imbrication lines

INCREMENTAL LINES OF RETZIUS

enamel

INCREMENTAL LINES OF VON EBNER

dentin

MARKS THE APPOSITIONAL GROWTH OF ENAMEL AND DENTIN

incremental lines of von Ebner or imbrication lines,

hypomineralization between the globules.

INTERGLOBULAR DENTIN

Forms in crowns of teeth in the circumpulpal dentin j

INTERGLOBULAR DENTIN

The dentinal tubules pass u n i n t e r r u p t e d l y , t h u s demonstrating a defect of mineralization & not of matrix formation

INTERGLOBULAR DENTIN

Some of the incremental lines are accentuated because of disturbances in the matrix and mineralization process.

contour lines of owen.

continues after tooth eruption and throughout the life of the pulp.

dentin formation

begins at areas subjacent to the cusp tip or incisal ridge and gradually spreads to the apex of the root.

dentin formation

yellowish elastic lower content of mineral salts - more radiolucent

dentin

Inrganic matter: HYDROXYAPATITE CRYSTALS Ca10(PO4)6(OH)2

65%

Organic and water percentage Form the pulp tissue Exudate. imparts elasticity to dentin

30%

Organic matters and water COLLAGEN Non-collagenous Proteins GROUND SUBSTANCE: Mucopolysaccharides (proteoglycans, GAGs)

35%

Unmineralized zone of dentin. The most recently formed layer of dentin is always on the pulpal surface.

PRE DENTIN

This unmineralized zone of dentin is immediately next to the cell bodies of odontoblasts

PRE DENTIN

Composed primarily of collagen fibers and water.

PRE DENTIN

Dentin forming the initial shape of the tooth

PRIMARY DENTIN

Usually completed after 3 years after tooth erruption.

PRIMARY DENTIN

represents all the dentin that is formed before the completion of root formation

PRIMARY DENTIN

first formed dentin in the crown underlying the dentinoenamel junction. outer or most peripheral part of the primary dentin & is about 20um thick.

MANTLE DENTIN

forms the remaining primary dentin or bulk of the tooth. Represents all of the dentin formed prior to root completion. fibrils are much smaller in diameter & are more closely packed together. Slightly more mineral content than mantle dentin.

CIRCUMPULPAL DENTIN

narrow band of dentin bordering the pulp and representing the dentin formed after root completion. fewer tubules

SECONDARY DENTIN

Replaced by odontoblast (termed secondary odontoblast)

REPARATIVE DENTIN/TERTIARY DENTIN

Response to moderate-level irritants such as attrition, abrasion, erosion and trauma

REPARATIVE DENTIN/TERTIARY DENTIN

appears as a localized dentin on the wall surface of pulp cavity.

REPARATIVE DENTIN/TERTIARY DENTIN

small canals that extend through the entire width of dentin, from the pulp to the DEJ

dentinal tubules

opened and widened by acid application

tubule apertures

It is the cytoplasmic cell process (Tomes fiber) of an odontoblast.

Odontoblastic process

cell bodies of odontoblasts are in the pulp near the dentin- pulp border

Odontoblastic process

the dental lymph or fluid of dentin transudate of extracellular fluid, mainly cytoplasm of odontoblastic processes, from the dental pulp via the dentinal tubules.

Dentinal fluid

more highly mineralized than intertubular dentin.

PERITUBULAR DENTIN

twice as thick in outer dentin (approx. 0.75um) than in inner dentin (0.4um).

PERITUBULAR DENTIN

Organic matrix is lost along with mineral after decalcification.The calcified tubule wall has an inner organic lining termed the lamina limitans, high in glucosaminoglycans (GAG)

PERITUBULAR DENTIN

main body of dentin.

INTERTUBULAR DENTIN

located between the dentinal tubules or, more specifically, between the zones of peritubular dentin. Its organic matrix is retained after decalcification

INTERTUBULAR DENTIN

About one-half of its volume is organic matrix, specifically collagen fibers. The fibrils range from 0.5 to 0.2um in diameter.

INTERTUBULAR DENTIN

Can be seen radiographically into the form of radioopaque area in the s-shape tubule.

SCLEROTIC DENTIN

harder, denser, less sensitive, and more protective of the pulp against subsequent irritations.

SCLEROTIC DENTIN

Sclerosis resulting from aging

PHYSIOLOGIC DENTIN SCLEROSIS

sclerosis resulting from a mild irritation

REACTIVE DENTIN SCLEROSIS

Dentinal tubules with debris.

Smear Plugs

greatly reduce permeability of cut dentin surface

Smear layer and smear plugs

Thin altered surface wherever the dentin has been cut or abraded

Smear layer

Few microleakage in thickness and is composed of denatured collagen, hydroxyapatite and other cutting debris

Smear layer

Destruction of exposed collagen

DENATURATION

in which stimuli directly effect the nerve endings in the tubules.

Direct conduction theory

membrane of the odontoblast process conducts an impulse to the nerve endings in the predentin, odontoblast zone, and pulp

Transduction theory

stimuli cause an inward or outward movement of fluid in the tubule, which in turn produces movement of the odontoblast and its processes.

Fluid or hydrodynamic theory

Referring to the outward (exposed) porton of reactive sclerotic dentin where slow caries has destroyed formerly overlying tooth structure , leaving a hard darkened surface.

EBURNATED DENTIN

It is encountered whenever odontoblast and their processes are stimulated during operative procedures

Dentin sensitivity

Is primarily dependent on the remaining dentin thickness and the diameter of tubules.

Dentin Permeability

is less effective barrier than is superficial dentin near the dentino enamel junction and dentinocemental junction

Deep dentin

Dissolution of hydroxyapatite crystals

demineralization

Caries formation is a two-step process;

demineralization, DENATURATION

Dentin demineralizes at

pH6.2.

remineralization of demineralized dentin relies on intergrity of collagen framework.

CARIES REVERSAL

dentin softer than enamel.

true

dentin is opaque or dull, less reflective to light than similar enamel which appear shiny

true

in explorer tip, enamel surface provide sharper , and higher pitch sound than dentin surface

true

have acidic “conditioners” that remove smear layer and partially demineralized the intertubular dentin.

DENTIN BONDING

HYBRID LAYER Most dentin bonding system remove or stabilize smear layer allowing to penetrate.

DENTIN BONDING

Resultant resin interdiffusion zone.

DENTIN BONDING

PERITUBULAR DENTIN calcified tubule wall has an inner organic lining termed the

lamina limitans

fibrils found in this zone are perpendicular to the dentinoenamel junction

MANTLE DENTIN

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