Enamel

Tameyra Stefani Al-Suhairy · 44問 · 1年前

通報

問題一覧

Cariology

Dental caries

cariogenic bacteria causes caries

streptococcus mutans

3 composition of teeth

Enamel, Pulp dentin complex, Cementum

Dental caries affect only 3

Enamel, Dentin, Cementum

no dental caries in

pulp

Inflammation of pulp

Pulpitis

Pulpitis not treated

Necrosis

Cariology

restorative dentistry

Anatomical crown Hardest Very brittle

Enamel

Provides outermost hard covering of crown allowing efficient mastication resist wear

Enamel

Enamel thickest on

Incisal edge / cusp tip

Enamel formed by the cells

Ameloblast

Originate from embryonic germ layer

Ectoderm

Epithelial product derived from

Epithelium

Connective tissue

Ectomesenchyme

Differentiate into ametoblast

IDE

Must occur first

Dentinogenesis

Formative cells of enamel

Ameloblast

Ameloblast derived from

dental lamina

Dental lamina is from

Oral epithelium

Enamel is product of

Epithelium

dentin cementum pdl alveolar bone derived from

connective tissue ectomesenchyme

Enamel

Molecule allowed by enamel

salts

true

Absorption of ____ related to enamel's permeability

fluoride

Enamel not completely mineralized

Immature enamel

2-3 3 years for enamel to mineralized

Enamel maturation

Thickness of enamel

2 to 2.55 mm

Thinnest enamel

cervical region

Inorganic hydroxyapatite crystals

96%

Organic amelogenin enamel

Water of enamel

Enamel rods or prisms

Enamel rod diameter of head

Enamel rod covered by a sheath of protein

rod sheath

in between enamel rods

Interprismatic/interrod substance

Enamel prism

Fish scale appearance

Enamel rods

Paddle shape

Enamel rod

Key hole appearance

Enamel rods

Perpendicular at 90 degrees to the DEJ

Enamel rod

Vertical oriented under cusp tip

Enamel rod

Cervical region enamel rods apically oriented

Permanent teeth

Cervical region enamel rods occlusally or horizontally oriented

deciduous or primary teeth

Gnarled enamel

HSB

Dark bands of HSB

Diazone

Light bands of HSB

parazone

DEJ

Towards dentin

DEJ convexity

Towards enamel

DEJ concavity

Enamel lamellae

Enamel tuft

Implicated in the initiation of dental caries favor the start of dental caries

Enamel lamellae

Entry points for bacteria and cariogenic foods

Enamel lamellae

Grass like Narrow ribbon like hypomineralized fault

Enamel tuft

Leaf like and long

Enamel lamellae

It will not reach the surface

Enamel lamellae

favor lateral spread of dental caries to DEJ

Enamel tuft

Shock absorber I force

Enamel tuft

Club like

Enamel spindles

Not a fault / hypocalcified structure Part of a cell - odontoblast

Enamel spindle

Odontoblastic process location

dentin inside dentinal tubule

Odontoblast body location

Dental pulp

Some odontoblastic process reach

enamel

protoplasmic extension of odontoblastic process that has gone beyond DEJ and reached enamel

Enamel spindles

Enamel spindle

Pain receptor

Formation of enamel happens in the

Cusp tip

molar, first enamel will form in

Cusp tip / incisal edge

4 lobes represented by

Mamelons

Last lobe / 4th lobe are in

Cingulum on the lingual

Coalasce of cusps form the

grooves

Depressions

Fossae

Grooves and fossae

Uncoalesced grooves or imperfect union are called

Fissures

Meeting point of fissures

Pit

U and V type

i and K type

Pits and fissure

incremental striae of retzius

Lines of retzius

External manifestation of lines of retzius

Perykymata

Imbrication lines of pickerill

Elevation between the grooves

Perykymata

during birth, exagerrated line of retzius

neonatal line

Reduced enamel epithelium

Primary enamel cuticle or nasmyth membrane

Pellicle

enamel maturation

doesnt have enamel rods

prismless enamel

Enamel etching

Hypoplasia

100

hypomineralized rods that resembles grass or ribbon, arising from the DEJ and extend to enamel

Enameltufts

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