Enamel
description
Transcript of Enamel
![Page 1: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/1.jpg)
![Page 2: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/2.jpg)
GENERAL CHARACTERS
1-ECTODERMAL TISSUECOVERING THE ANATOMICAL CROWN.
2-HIGHLY MINERALIZED, RISIST MASTICATORY FORCES.
3-ACELLULAR, INERT, NONVITAL AND INSENSITIVE.
4-CANNOT REPALCED OR REGENERATED.
5-PERMEABLE TO IONIC STRUCTURE.
![Page 3: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/3.jpg)
PHYSICAL PROPERTIES
2-THICKNESS
5-PERMEABILITY
1-COLOUR
4-BRITTLNESS
3-HARDNESS
![Page 4: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/4.jpg)
1 - COLOUR
YELLOWIH WHITE TO YELLOWIH WHITE TO GRAYISH WHITEGRAYISH WHITE
DEPENDS ON: 1 -DEGREE OF
CALCIFICATION2 -HOMOGENISITY OF
THE ENAMELSO:
YELLOWISH YELLOWISH TEETH…. TRANSLUCENT E.GRAYISH GRAYISH TEETH …… OPAQUE E .
![Page 5: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/5.jpg)
2 - THICKNESS
-22 – – 2.52.5 mmmm. at the cusps of the molars and premolars.
-Thinning downThinning down to
Almost knife edge at the cervical margin of the tooth
![Page 6: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/6.jpg)
3 – HARDNESS
IT IS THE HARDEST IT IS THE HARDEST CALCIFIED TISSUE IN CALCIFIED TISSUE IN THE BODYTHE BODY DUE TODUE TO:
1 -HIGH CONTENT OF THE MINERAL SALTS
2 -ITS CRYSTALLINE ARRANGEMENT.
-ENAMEL OF THE PERMANENTPERMANENT TEETH E. IS HARDER THAN THAT OF DECIDUOUS ONES’
-ENAMEL ENAMEL MICROHARDNESSMICROHARDNESS
-1 - IS GREATEST AT THE SURFACE AND DECREASED TOWARD
DEJ. 2 - IT IS GREATER AT THE
CUSPS AND INCISAL RIDGE AND DECREASES TOWARD THE CERVICAL LINE.
+
-
+
+
+
-
-
![Page 7: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/7.jpg)
ASG
4 - BRITTLNESS
ITS STRUCTURE AND HARDNESS RENDER IT BRITTLE, SPECILY WHEN IT LOOSES ITS ELASTIC FOUNDATION OF HEALTHY DENTIN
![Page 8: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/8.jpg)
5 -PERMEABILITY
-ENAMEL HAS A CERTAIN CERTAIN DEGREE OF PERMEABILTYDEGREE OF PERMEABILTY DEMONSTRATED BY DYES AND RADIOACTIVE ISOTOPES.
-IT ACTS AS A IT ACTS AS A SEMIPERMEABLE SEMIPERMEABLE MEMBRANEMEMBRANE FOR CERTAIN IONS AND DYES OF SMALL MOLECULAR SIZE THROUGH PORES BETWEEN THE CRYSTALS.
![Page 9: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/9.jpg)
Enamel
•Specific Gravity of enamel is around 2.8
•It shows birefringence
•It is an optical property. It shows two colors when viewed with polarized light
![Page 10: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/10.jpg)
CHEMICAL PROPERTIES
INORGANIC
ORGANIC
INORGANIC ORGANIC
BY WEIGHT
96% 4%
BY VOLUME
EQUAL EQUAL
![Page 11: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/11.jpg)
CHEMICAL PROPERTIES
![Page 12: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/12.jpg)
ASG
INORGANIC MATERIAL 96%
CALISUM PHOSPHATE CRYSTALLINE
(HYDROXY APATITE )
3 Ca3 )PO4(2 . Ca )OH(2
THE SUSCEPTIBILITY OF THESE CRYSTALS TO DISSOLUTION BY ACIDSDISSOLUTION BY ACIDS PROVIDES THE CHEMICAL BASIS FOR THE CARIOUS LESION
THE PROBABILITY OF THE REPLACEMENT OF THE REPLACEMENT OF THE HYDROXYL RAICALHYDROXYL RAICAL WITH VARIOUS IONS (STRONIUM, MAGNESIUM, CARBONATE AND FLOURIDE ) DURING ENAMEL DEVELOPMENT OR IN THE INVIRONMENT OF THE FULLY FORMED ENAMEL GIVES THE BASIS FOR NATIONAL FLUORINATION OF DRINKING WATER OR TOPICAL FLUORIDE APPLICATION TRANSFORMING
HYDROXY APATITEHYDROXY APATITE CRYSTALS TO FLUOROAPATITE FLUOROAPATITE ONES .
3 Ca3 )PO4(2 . Ca )F(2 FOR MORE CARIES RISISTANCE
![Page 13: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/13.jpg)
ASG
ORGANIC MATERIAL 4%)1-2% ORGANIC MATERIAL AND 2-3% WATER(
- IT FORMSIT FORMS A FINE NETWORK BETWEEN THE CRYSTALS, OR COMPRESSSED FORMING AN ENVELOP
SURROUNDING EACH CRYSTAL -ITS CHEMICAL NATUREITS CHEMICAL NATURE HAS NOT YET COMPLETELY
DETERMINED .- NO SPECIFIC PROTEINSNO SPECIFIC PROTEINS HAVE BEEN IDNTIFIED.- AMINO ACIDSAMINO ACIDS PRESENT ARE COLLECTIVELY CALLED ENAMEL PROTEINENAMEL PROTEIN
1 – Amelogenins.: These are present during the enamel formation. These are lost during calcification of enamel
2 – ENAMEL PORTIEN OF HIGH MOLECULAR WEIGHT CALLED ENAMELINENAMELIN :It is present in the enamel matrix and persist in the mature enamel tightly bound to the hydroxy apatite crystals
.
![Page 14: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/14.jpg)
ASG
ENAMEL PROTEIN
) AMINO ACIDS(
DEVELOPING ENAMEL MATRIX
MATURE ENAMEL MATRIX
PROLINE + + + + +
GLUTAMINE + + + +
LEUCINE + + +
GLYCINE + +
HISTIDINE +
GLYCINE + + + + +
GLUTAMINE + + + +
PROLINE + + +
LEUCINE + +
HISTIDINE +
NOTE: THE SELECTIVE REABSORPTION OF THE AMINO ACIDS IS
THE FUNCTION OF THE AMELOBLASTS
![Page 15: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/15.jpg)
HISTOLOGICAL STRUCTURE
ENAMEL PRISM
ENAMEL
DENTIN
ENAMEL PRISM
1-ENAMEL PRISM
2-PRISM SHEATH
3-INTERPRISMATIC
SUBSTANCE
![Page 16: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/16.jpg)
STRUCTURE
![Page 17: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/17.jpg)
HISTOLOGICAL STRUCTURE
HEXAGONAL
OVAL
ROUND
FISH SCALES
KEY HOLE
![Page 18: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/18.jpg)
ENAMEL PRISM
LOWER CENTRAL INCISOR
5 MILLIONS
UPPER FIRST MOLAR
12 MILLIONS
1 - NUMBER
2 - DIRECTION
![Page 19: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/19.jpg)
ASG
ENAMEL PRISM
3 - COURSE
DENTINO-ENAMEL MEMBRANE
STRUCTURELESS ENAMEL
GNARLED ENAMEL
![Page 20: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/20.jpg)
ENAMEL PRISM
4 - DIAMETER
1
2:
3-4 um / 8 um
![Page 21: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/21.jpg)
ASG
BY LIGHT MICROSCOPE
ENAMEL PRISMPRISM
PRISM SHEATH
INTERPRISMATIC SUBSTANCE
CROSS STRIATION
![Page 22: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/22.jpg)
ENAMEL PRISM
BY THE ELECTRON MICROSCOPE
CRYSTALS
CRYSTALS
INTERPRISMATIC SUBSTANCE
PRISM
PRISM SHEATH
Prism sheath
INTERPRISMATIC SUB. WITH HIGHER REFRACTIVE INDEX
PRISM SHEATH
INTERPRISMATIC REGION
PRISM
HEAD
TAIL
![Page 23: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/23.jpg)
HUNTER SCHREGER’S BANDS
Oblique reflected light
Transmitted light
![Page 24: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/24.jpg)
INCREMENTAL LINES
PERIKYMATA
LONG INCREMENTAL LINES
SHORT INCREMENS
CROSS STRIATIONS
![Page 25: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/25.jpg)
BETWEEN SEGMENT OF 4 u LENGTH ,DAILY RATE OF SECRETORY ACTIVITY OF
AMELOBLASTS
11 – – SHORT INCREMENTAL SHORT INCREMENTAL LINESLINES
(CROSS STRIATION)
![Page 26: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/26.jpg)
ASG
2 – LONG INCREMENTAL LINE2 – LONG INCREMENTAL LINE
(INCREMENTAL LINE OF RETZIUS) BROWN STRIA OF RETZIUS
4 DAYS ARE NEEDED FOR THE FORMATION OF THE ENAMEL MATRIX BETWEEN TWO BANDS
![Page 27: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/27.jpg)
33 – – NEONATAL LINENEONATAL LINE
PRENATAL ENAMEL
POSTNATAL ENAMEL
POSTNATAL ENAMEL
PRENATAL ENAMEL
![Page 28: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/28.jpg)
ASG
PRIMARY ENAMEL CUTICLE)Nasmyth’s membrane(
- 0.2 um0.2 um thick.
- Its structurestructure is similar to the basal lamina of the epithelium.
- It is the lastthe last product of the ameloblasts.
![Page 29: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/29.jpg)
THE AMELODENTINAL JUNCTION
ENAMEL
DENTIN
![Page 30: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/30.jpg)
ENAMEL LAMELLAE
TYPE A TYPE B
TYPE C
![Page 31: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/31.jpg)
ENAMEL TUFT
![Page 32: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/32.jpg)
ENAMEL SPINDLES
DENTINAL TUBULES
ENAMEL
DENTIN
![Page 33: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/33.jpg)
SURFACE STRUCTURES
REMEMBER: THAT THERE IS AN INNER STRUCTURELESS ENAMEL
1 – OUTER STRUCTURELESS ENAMEL
30 um thick
![Page 34: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/34.jpg)
2 - PERIKYMATA
PARALLEL PARALLEL TO EACH OTHER AND TO C.E.J.
CONTINUOUS AROUND THE TOOTH.
30/ mm30/ mm – AT THE REGION OF C.E.J.
10/ mm10/ mm – NEAR TO THE OCCLUSAL OR INCISAL EDGES
![Page 35: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/35.jpg)
3 - ROD ENDS
SHALLOWERSHALLOWER CERVICALLY
DEEPERDEEPER OCCLUSALLY
![Page 36: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/36.jpg)
4 - CRACKS
ENAMEL LAMELLA
ASG
![Page 37: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/37.jpg)
5 - AFIBRILLAR CEMENTUM
ENAMEL
DE
NT
IN
CEMENTUM
![Page 38: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/38.jpg)
LIFE HISTORY OF THE AMELOBLASTS
1 - MORPHOGENIC2 - ORGANIZING
DEAL WITH INNER DENTAL
EPITHELIUM
7 STAGES
3 – FORMATIVE4 – TRANSITIONAL
5 - MATURATIVE
FUNCTIONS OF DIFFERENTIATED AMELOBLASTS
6 – PROTECTIVE7 - DESMOLYTIC
FUNCTIONS OF THE REDUCED
ENAMEL EPITHELIUM
REDUCED ENAMEL EPITHELIUM
![Page 39: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/39.jpg)
ASG
Before ameloblasts differentiation
A – MORPHOGENIC STAGE
INNER DENTAL EPITHELIUM
CELL FREE ZONE
DENTAL PAPILLA
BASEMENT MEMBRA
![Page 40: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/40.jpg)
ASG
Before ameloblasts differentiation
A – MORPHOGENIC STAGE
Oval nucleus
Short columner
Golgi apparatus
Centriol
Mitochondria
PROXIMAL END
DISTAL END
BASEMENT MEMBRANE
![Page 41: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/41.jpg)
ASG
During ameloblasts differentiation
A – MORPHOGENIC STAGE
NUCLEUS
GOLGI APP.
CENTRIOL
MITOCHONDRIA
PROXIMAL TERMINAL BARS
BASEMENT MEMBRANE
PROXIMAL END
DISTAL END
![Page 42: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/42.jpg)
ASG
B – ORGANIZING STAGEINNER DENTAL
EPITHELIUM
ODONTOBLASTS
INNER DENTAL EPITHELIUM
Cell free zone disappears
ODONTOBLASTS
![Page 43: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/43.jpg)
ASG
B – ORGANIZING STAGE
Centrioles
Golgi apparatus
Mitochondria
SO DURING THIS STAGE THE FOLLOWIONG OCCURE:
1 - REVERSAL OF THE FUNCTIONAL POLARITY OF THE I.D.E...
2 –HISTO-DIFFERENTIATION OF THE ODONTOBLASTS ) INDUCTION(.
![Page 44: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/44.jpg)
ASG
C – FORMATIVE STAGE
DENTIN
AMELOBLASTS
G.AG.A.
R.E.RR.E.R..
MM
DISTAL TERMINAL BARS
TOME’S PROCESS
PROXIMAL TERMINAL BARS
![Page 45: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/45.jpg)
ASG
D – TRANSITIONAL STAGE
PRISMLESS ENAMEL
1 – REDUCTIONREDUCTION IN THE HIGHT.
2 – DECREASEDECREASE IN IN ITS VOLUM AND ORGANELLE CONTENT
3 – WITHDRAWAL OF TOME’S ROCESS.
1 – REDUCTIONREDUCTION IN THE HIGHT.
2 – DECREASEDECREASE IN IN ITS VOLUM AND ORGANELLE CONTENT
3 – WITHDRAWAL OF TOME’S ROCESS.
![Page 46: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/46.jpg)
E – MATURATIVE STAGE
AUTOPHAGIC VACUOLES
RUFFLED ENDED AMELOBLASTSMOOTH ENDED AMELOBLAST
CYTOPLASMIC VACUOLES
MM
![Page 47: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/47.jpg)
F – PROTECTIVE AND DESMOLYTIC STAGES
REDUCED ENAMEL EPITHELIUM
1 – PROTECTIVE.
2 - DESMOLYTIC
![Page 48: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/48.jpg)
SUMMARY
De
ntin
Aprismatic enamel
Aprismatic enamel
Prismatic enamel
Ameloblast without
Tome’s process
Ameloblast without
Tome’s process
Ameloblast with
Tome’s process
Late organizing stage
Formative stage Transitional stage
![Page 49: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/49.jpg)
ASG
![Page 50: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/50.jpg)
THE BEGINNING OF MINERALIZATION OF THE ENAMEL MATRIX DOES NOT AWAIT THE
COMPLETION OF ITS FORMATION.
AMELOGENESISAMELOGENESIS
1 - FORMATION 1 - FORMATION OF ENAMEL OF ENAMEL
MATRIXMATRIX
2 - MATURATION 2 - MATURATION OF ENAMELOF ENAMEL
![Page 51: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/51.jpg)
FORMATION OF ENAMEL MATRIX
STRATUM INTERMEDIUM
AMELOBLASTS
ENAMEL MATRIX )DENTINOENAMEL
MEMBRANE (
MANTLE DENTIN
D . J .C.
STIPPLED MATERIAL/OR ENAMEL
NO CLEAR CUT BAND OF ORGANIC MATRIX
25 – 30 % OF THE TOTAL MINERAL CONTENT
![Page 52: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/52.jpg)
De
ntin
Aprismatic enamel
Aprismatic enamel
Prismatic Enamel
Ameloblast without
Tome’s process
Ameloblast without
Tome’s process
Ameloblast with
Tome’s process
Late organizing stage
Formative stage Transitional stage
![Page 53: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/53.jpg)
Prism
Tome’s process
Prism sheath
Interprismatic
substance
Cross
straiation
MORE DETAILS ABOUT THE MODE OF FORMATION AND LOCATION OF THE PRISM, INTERPRISMATIC
SUBSTANCE, PRISM SHEATH AND CROSS STRIATION
![Page 54: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/54.jpg)
ASG
Head / or
Prism
Tail / or
Interprismatic
substance
Tome’s process
Next
1 MORE DETAILS ABOUT THE PROCESS OF SECRETION OF BOTH THE PROTEINS AND THE CRYSTALLITES FROM THE TOME’S PROCESS
![Page 55: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/55.jpg)
ASG
Tome’s process
Next
Tail
Head
2
![Page 56: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/56.jpg)
ASG
Tome’s process
Next
Tail
Head
3
![Page 57: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/57.jpg)
ASG
Tome’s process
Tail
Head
4
![Page 58: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/58.jpg)
Tail
Head
![Page 59: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/59.jpg)
ASG
2 - MATURATION OF ENAMEL
ONCE THE FULL THICHNESS OF ENAMEL MATRIX IS FORMED
MATURATION BEGINS
DURING MATURATION THE FOLLOWING
CHANGES OCCURE
1 - Quantitative And Qualitative Changes In The Organic Component.
2 - 90 % Of Protein And Water Reabsorbed.
3 – Maturation Is Gradually Completed Up To 96% Of The Total Weight Of Enamel ))Primary Primary Maturation(Maturation(
4 – Rapid Influx Of Calcium And Phosphate Ions Already Secreted With The Enamel Matrix.
5 – Increase In Size Of The Crystals By Fusion Of Crystallites ) 1240 Crystal / Um Before And 560 Crystal / Um After Maturation (.
5 – – Directions Of Maturation …)next slide (– Directions Of Maturation …)next slide (
6 - 6 - Secondary Maturation..Secondary Maturation..
![Page 60: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/60.jpg)
ASG
DIRECTIONS OF MATURATION
ENAMEL
DENTIN
PREDENTIN
ENAMEL
DENTIN
PREDENTIN
![Page 61: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/61.jpg)
ASG
![Page 62: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/62.jpg)
SECONDARY MATURATION
MATURATION CONTINUES AFTER ERUPTION OF
THE TEETH THROUGH DEPOSITION OF IONS FROM THE SALIVA.
![Page 63: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/63.jpg)
AGE CHANGES
1 - ATTRITION
![Page 64: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/64.jpg)
ATTRITION
• DEFINITION.• DIFFERENCE BETWEEN D.T. AND P.T.• CLINICALY: OCCLUSAL AND PROXIMAL.• SEX DIFFERENCE.• TYPE OF DIET.• OCCUPATIONAL HABITS.• SEVERE ATTRITION.• MICROSCOPICALLY.
![Page 65: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/65.jpg)
ASG
2 - PERMEABILITY
Main pathRecently
Erupted teeth
Old enamel
![Page 66: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/66.jpg)
2 - PERMEABILITY
• IONIC EXCHANGE BETWEEN THE ENAMEL AND THE SURROUNDING SALIVA.
• SECONDARY MATURATION.• INCREASE NITROGEN AND FLUORIDE.• RESISTANCE TO DECAY IS INCREASED.• TOOTH MAY BECOME DARKER IN COLOUR
)THE EFFECT OF THE DAYSTUFFS STAINS(
![Page 67: Enamel](https://reader038.fdocuments.in/reader038/viewer/2022102804/548b582bb47959b3198b460a/html5/thumbnails/67.jpg)
THANK YOUAND
GOOD LUCK
THANK YOUAND
GOOD LUCK