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Decidious and Permanent Tooth, Medinna Rasha - 2506557816 - Coggle Diagram
Decidious and Permanent Tooth
Chronology of Tooth Development
🔹 Overall Sequence
Initiation → Bud → Cap → Bell → Apposition → Calcification → Eruption → Root completion
Developmental Stages
1. Initiation (≈ 6th week IU)
Dental lamina forms
20 deciduous tooth germs start
2. Bud Stage
Tooth buds form
3 components:
Enamel organ
Dental papilla
Dental follicle
3. Cap Stage
Structures differentiate:
Enamel organ → enamel
Papilla → dentin + pulp
Follicle → PDL, cementum, bone
4. Bell Stage
Crown shape determined
Cells differentiate:
Ameloblasts → enamel
Odontoblasts → dentin
5. Apposition
Dentin forms first → then enamel
6. Calcification
Mineral deposition (Ca + phosphate)
Starts in deciduous teeth (in utero)
Primary Dentition Timeline
Calcification (IU)
Begins ~14–19 weeks IU
Eruption Sequence
CI → LI → 1M → C → 2M
Eruption Age
6 months → 3 years
Permanent Dentition Timeline
Development
From successional dental lamina
Eruption Sequence
1M → CI → LI → PM → C → 2M → 3M
Eruption Age
6 years → 21 years
Final Stage
Root completion = 2–3 years after eruption
Function: Deciduous vs Permanent Teeth
Functions of Deciduous Teeth
Mastication (basic chewing)
Speech development
Esthetics (facial support)
Maintain arch space
Guide permanent eruption
Stimulate jaw growth
Functions of Permanent Teeth
Strong mastication
Long-term speech support
Maintain occlusion
Lifelong function
Anterior Teeth Morphology
INCISORS
Deciduous
Smaller, wider
Rounded crown
Prominent cervical ridge
No mamelons
Shallow lingual fossa
Long slender roots
Whiter
Permanent
Larger, elongated
Sharp angles
Mamelons (newly erupted)
Deep lingual fossa
Defined ridges & cingulum
Thicker roots
Slightly yellow
CANINES
Deciduous
Small, bulbous
Prominent cervical ridge
Smooth surface
Minimal lingual anatomy
Slender roots
Permanent
Larger, longer crown
Strong labial ridge
Prominent lingual anatomy
Longest, thickest roots
Posterior Teeth Morphology
Deciduous
Bulbous crown
Strong cervical constriction
Prominent mesiobuccal ridge
Thin enamel/dentin
Large pulp chamber
Roots:
Long
Slender
Widely flared
Occlusion:
Simple
Low cusps
Shallow grooves
Function:
Light chewing
Space maintenance
Permanent
Larger, bulky crown
Thick enamel/dentin
Complex occlusal surface:
Deep grooves
Well-defined cusps
Roots:
Thick
Strong
Less flared
Designed for heavy mastication
Differences
Number
Deciduous: 20
Permanent: 32
Size & Shape
Deciduous: small, round
Permanent: big, sharp
Color
Deciduous: whiter
Permanent: more yellow
Enamel
Deciduous: thin
Permanent: thick
Pulp
Deciduous: larger
Permanent: smaller
Roots
Deciduous: thin, spread out
Permanent: thick, strong
Function
Deciduous: temporary, guide teeth
Permanent: lifelong, chewing
Fate
Deciduous: fall out
Permanent: stay
Medinna Rasha - 2506557816