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