This document summarizes different types of dentin found in teeth. It discusses primary, secondary, tertiary, reactionary, reparative, and sclerotic dentin. Tertiary dentin is formed in response to external stimuli and can be reactionary or reparative dentin. Reactionary dentin is formed by original odontoblast cells when the stimulus does not cause cell death. Reparative dentin has irregular tubules and is formed by new odontoblast-like cells when the stimulus causes cell death. Sclerotic dentin has blocked tubules that decreases permeability and protects the pulp.

3. SCLEROTIC &
TERTIARY
DENTIN
BY: JUNAID HAIDER
ROLL NO.107
KCD 1ST YEAR

4. CONTENTS
• INTRODUCTION
• TYPES OF DENTIN
• TERTIARY DENTIN
i) Reactionary Dentin
ii) Reparative Dentin
• SCLEROTIC DENTIN
• DEAD TRACTS

6. INTRODUCTION
Hard dense bony tissue
forming the bulk of a tooth,
beneath the enamel.
TYPES:
 PRIMARY DENTIN
 SECONDARY DENTIN
 TERTIARY DENTIN

7. TERTIARY
DENTIN
Dentin which is formed in
response to external
stimuli.
Very fast.
TYPES:
 REACTIONARY OR REGENERATIVE
DENTIN
 REPARATIVE OR RESPONSE DENTIN

8. i) REACTIONARY
DENTIN
o When Stimulus
come and
odontoblast
process survive.
o Very regular
dentin.
o It is secreted by
original
odontoblast cells.

9. ii)REPARATIVE
DENTIN
oWhen stimulus cause
degeneration of
odontoblast process.
oTwisted and irregular
dentinal tubule.
oDepends on duration and
intensity of stimuli.
oIt is formed by newly
differentiated odontoblast
like cells.

10. SCLEROTIC
DENTIN
 Dentinal tubule get
blocked due to calcium
salt deposition.
 Formed to protect pulp.
 Permeability decrease .
 Black light reflected.
 White light transmission.
 Also seen as an age
changes.

11. REFERENCE:ORBAN AND TENCATE