Human Dentition​ a. Primary Dentition​ b. Secondary dentition​ Normal Anatomy Of Tooth​ Histology of Tooth​ (Enamel, Dentin, DEJ, pulp, Periodontal ligament, alveolar Bone)​ ​

1. • Human Dentition
a. Primary Dentition
b. Secondary dentition
• Normal Anatomy Of Tooth
• Histology of Tooth
(Enamel, Dentin, DEJ, pulp, Periodontal ligament,
alveolar Bone)

4. Permanent
Dentition

5. enamel/crown
CEJ
Cementum/root

6. Crown Consists of
Enamel
Dentin
Pulp with pulp chamber
Root consists of
Cementum
Dentin
Pulp within pulp canal
Root apex and periapical tissue

7. Anatomical
root
Anatomical
Crown
Clinical
Crown
Clinical
root

8. Labial/buccal aspect of permanent teeth

9. H&E staining cross section of tooth

10. Hardest calcified tissue
consists of inorganic material (hydroxyapatite
crystal- 96%) and small amount of organic
substances and water (4%)
composed of enamel rods (prisms), rod
sheaths and interprismatic substance
Enamel rods are cylindrical in
longitudinal section.
ENAMEL

11. • Primary Dentition
– Rods are approximately horizontal in the cervical
and central part of crown.
– Oblique near cusp tip and incisal edge
• Permanent Dentition
– In cervical region rods deviate from horizontal in
apical direction.
Generally, rods are oriented at right angle to
the dentin surface

12. Longitudinal
section
(ENAMEL)
(ENAMEL)

13. light yellowish and viscoelastic structure
consists of 35% organic matter and water and 65%
inorganic material
consists of dentinal tubules which show primary and
secondary S-shaped curvature
dentinal tubules contain odontoblastic process
Dentinal fluid is present in dentinal tubule and
odontoblastic process.
DENTIN

15. DENTINOENAMEL JUNCTION
DEJ shows scalloped outline, Hence providing
bigger surface area and better adhesion
between enamel and dentin.

16. • specialized calcified substance covering the
root of a tooth
• Part of peridontium
• attaches the teeth to the alveolar bone by
anchoring the periodontal ligament
• Pale yellow in color and softer
• Composed of inorganic materials (45-50%) ,
organic matrix-33% and water 22%.
CEMENTUM

18.  The pulp, or endodontium, is the part in the center
of a tooth made up of living connective tissue
 It is divided into coronal and radicular pulp
 Zones of pulp
Odontoblastic zone
Cell free zone
Cell rich zone
Pulp core
PULP
Coronal Pulp
Radicular Pulp

20. PERIODONTAL LIGAMENT
• The periodontal ligament is the fibrous
connective tissue structure, with neural and
vascular components, that joins the cementum
covering the root to the socket of alveolar bone.

22. ALVEOLAR BONE
• Part of jaw bone that supports and holds roots
of teeth.
• Though being functionally different, alveolar
bone is histologically similar to bone elsewise

23. References
• Atlas Of Oral Histology
• Orban’s Oral Histology and Embryology
• Wheelers Dental Anatomy and Occlusion