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Dentin
  • Tameyra Stefani Al-Suhairy

  • 問題数 78 • 9/20/2024

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    問題一覧

  • 1

    opened and widened by acid application

    tubule apertures

  • 2

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

    INTERTUBULAR DENTIN

  • 3

    dentin softer than enamel.

    true

  • 4

    yellowish elastic lower content of mineral salts - more radiolucent

    dentin

  • 5

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

    Dentin sensitivity

  • 6

    MARKS THE APPOSITIONAL GROWTH OF ENAMEL AND DENTIN

    incremental lines of von Ebner or imbrication lines,

  • 7

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

    dentin formation

  • 8

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

    Transduction theory

  • 9

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

    SCLEROTIC DENTIN

  • 10

    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

  • 11

    Dentinal tubules with debris.

    Smear Plugs

  • 12

    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

  • 13

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

    REPARATIVE DENTIN/TERTIARY DENTIN

  • 14

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

    GLOBULAR CALCIFICATION

  • 15

    Replaced by odontoblast (termed secondary odontoblast)

    REPARATIVE DENTIN/TERTIARY DENTIN

  • 16

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

    Bell stage

  • 17

    Destruction of exposed collagen

    DENATURATION

  • 18

    INCREMENTAL LINES OF VON EBNER

    dentin

  • 19

    Usually completed after 3 years after tooth erruption.

    PRIMARY DENTIN

  • 20

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

    Dentin Permeability

  • 21

    ectomensenchymal cells proliferate

    Bud and cap stage

  • 22

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

    Odontoblastic process

  • 23

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

    contour lines of owen.

  • 24

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

    30%

  • 25

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

    DENTIN BONDING

  • 26

    Crystals are deposited in linear direction

    LINEAR CALCIFICATION

  • 27

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

    Smear layer

  • 28

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

    incremental lines of von Ebner

  • 29

    Resultant resin interdiffusion zone.

    DENTIN BONDING

  • 30

    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

  • 31

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

    REPARATIVE DENTIN/TERTIARY DENTIN

  • 32

    Dentin demineralizes at

    pH6.2.

  • 33

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

    dentin and pulp tissues

  • 34

    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

  • 35

    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

  • 36

    hypomineralization between the globules.

    INTERGLOBULAR DENTIN

  • 37

    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

  • 38

    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

  • 39

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

    dentin

  • 40

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

    DENTIN BONDING

  • 41

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

    PERITUBULAR DENTIN

  • 42

    4 odontogenesis

    Histodifferentiation, Matrix Formation, Mineralization, Maturation

  • 43

    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

  • 44

    Forms in crowns of teeth in the circumpulpal dentin j

    INTERGLOBULAR DENTIN

  • 45

    Dentin forming the initial shape of the tooth

    PRIMARY DENTIN

  • 46

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

    Deep dentin

  • 47

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

    dentin

  • 48

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

    65%

  • 49

    Dissolution of hydroxyapatite crystals

    demineralization

  • 50

    sclerosis resulting from a mild irritation

    REACTIVE DENTIN SCLEROSIS

  • 51

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

    Direct conduction theory

  • 52

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

    Odontoblastic process

  • 53

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

    dentin

  • 54

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

    PRIMARY DENTIN

  • 55

    fibrils found in this zone are perpendicular to the dentinoenamel junction

    MANTLE DENTIN

  • 56

    more highly mineralized than intertubular dentin.

    PERITUBULAR DENTIN

  • 57

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

    true

  • 58

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

    dentin formation

  • 59

    remineralization of demineralized dentin relies on intergrity of collagen framework.

    CARIES REVERSAL

  • 60

    GLOBULAR AND LINEAR CALCIFICATION

    MINERALIZATION

  • 61

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

    dentin

  • 62

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

    lamina limitans

  • 63

    Thin altered surface wherever the dentin has been cut or abraded

    Smear layer

  • 64

    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

  • 65

    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

  • 66

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

    SECONDARY DENTIN

  • 67

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

    35%

  • 68

    Sclerosis resulting from aging

    PHYSIOLOGIC DENTIN SCLEROSIS

  • 69

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

    PRE DENTIN

  • 70

    INCREMENTAL LINES OF RETZIUS

    enamel

  • 71

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

    true

  • 72

    Caries formation is a two-step process;

    demineralization, DENATURATION

  • 73

    greatly reduce permeability of cut dentin surface

    Smear layer and smear plugs

  • 74

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

    SCLEROTIC DENTIN

  • 75

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

    dentinal tubules

  • 76

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

    PRE DENTIN

  • 77

    main body of dentin.

    INTERTUBULAR DENTIN

  • 78

    Composed primarily of collagen fibers and water.

    PRE DENTIN