DIFFERENCE BETWEEN DECIDUOUS TEETH

AND PERMANENT TEETH

Presented by :-Samson S. Samuel1st year

Guided by:-Dr. Fatima SaifyDr. Nidhi SharmaDr. Kedarnath Agarwal

Introduction - Teeth : * Hard structure * Cutting and chewing food * Embedded in socket * Attached by periodontal ligament

CONDENSED : DENTIN - * Hard tissue elastic in nature * Covered by enamel in the crown and by the cementum in Root .

ENAMEL - * Hardest tissue * Acellular * Shape and contour to the crown Pulp – * Vascular mesenchymal connective tissue * center of the tooth within rigid dentinal walls

PARTS :

Crown - Above cervical line of tooth Root - Below cervical line

FEATURES DECIDUOUD TEETH

PERMANENT TEETH

1. Duration 6 MONTH to 5 ½ years

6 ½ years on wards

2. NUMBER 20 { 2 incisor, 1 canine , 2 molars }

32 { 2 incisor, 1 canine , 2 primolars, 3 molars}

3.ENAMEL Thinner( About 1 mm )

Thicker( About 2-3 mm)

4. OCCLUSAL PLANE

Relatively flat More Curved contour

5. MAMMELEONS

Absent Present

MORPHOLOGICAL FEATURES CROWN

THE ROOT

FEATURES DECIDUOUS TEETH

PERMANENT TEETH

1. SHAPE Larger and more slender

Shorter and bulbous

2. ROOT TRUNK Smaller Larger

3. WIDTH Narrower mesiodistally

Broader mesiodistally

4. PHYSIOLOGICAL RESORPTION

During shedding of tooth

Absent

THE PULP

FEATURES DECIDUOUS TEETH

PERMANENT TEETH

1.PULP CHAMBER

LARGER SMALLER

2.ROOT CANALS

MORE RIBBON LIKE[HOUR GLASS APPEORANCE]

WELL DEFINED WITHLESS BRANCHING

3.ACCESSORY CANLS

PRESENT MAY BE ABSENT

4.CELLUARITY AND VASCULARITY

HIGH DEGREE LESS DEGREE

5.POTENTIAL HIGH POTENTIAL

LOW POTENTIAL

6.SENSITIVITY REDUCED HIGH

HISTOLOGIC DIFFERENCE

FEATURES

DECIDUOUS TEETH

PERMANENT TEETH

1.BLOOD SUPPLY

Enlarged apical foramens.The abundent blood supply

Restricted,Reduced blood supply

2.REPARATIVE DENTIN

More Less

3.DENSITY OF INERVATION

Less More

4.LOCALIZATION OF INFECTION

poorer Better

FEATURES DECIDOUS TEETH

PERMANENT TEETH

1.DENTINAL TUBULES

Less regular Most regular

2.DENTIN FORMING CELLS

Functionally active by approximately 360 days

Functionally active by 700 days

3.INTER GLOBULAR DENTIN

Absent Present

4.DENTIN Usually less dense

Difficult to cut

DENTINE

FEATURES

DECIDOUS TEETH

PERMANENT TEETH

1.ENAMEL AND DENTINE

Less mineralized

More mineralized

2.NEONTAL LINES

present Only seen in first Permanent molar

MINERAL CONTENT

FEATURES DECIDOUS TEETH

PERMANENT TEETH

1.BANDS OF RETZIUS

Less common More common

ENAMEL

FEATURES DECIDOUS TEETH

PERMANENT TEETH

1.SECONDARY CEMENTUM

Characteristically absent

Present

2.ALVEOLAR ATROPY

Rare occurs

3.GINGIVITIS Generally absent in healthy child similarly recession is infrequent

Common in adult

PERIODONTAL LIGAMENT

REFERENCE ::

1. TEXTBOOK FOR PEDODONTICS BY SHOBHA TANDON

2. PRINCIPLES AND PRACTICE OF PEDODONTICS BY ARATHI RAO

3. WHEELER’S DENTAL ANATOMY PHYSIOLOGY AND OCCLUSION

4. TEXTBOOK OF DENTAL AND ORAL HISTOLOGY WITH EMBRYOLOGY BY SATISH CHANDRA

5. A.T. BIVI JI

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