short presentation about eruption & its phases

1. DEFINE ERUPTION &
DESCCRIBE ITS
PHASES
AMJAD AL_BLEAHID

2. Tooth Eruption
 Eruption is the axial or occlusal
movement of the developing teeth, in
order to appear in the oral cavity & reach
the occlusal plane
 The onset of eruptive movement begins in
the bell-stage
 Axial movement begins with the onset of
root formation & continues throughout the
life span of the teeth

3. Eruption of tooth
 Axial or occlusal movement of teeth (or
teeth germs)
 From : Their developmental position in the
jaw
 To : Their functional position in the oral
cavity

4. Phases of Eruption
Pre-eruptive
phase
Eruptive
phase
Post-eruptive
phase

5. Pre-Eruptive Phase
 STARTE : End of early bell
 ENDS : Beginning of root formation
 EVENTS : Jaw growth In length , width
and height
 TYPES OF MOVEMENTS :
 1-Bodily movement
 2-Eccentric growth

6. Histological Changes
 During this phase, movements are
achieved in two ways :
 1-bodily movement resorption occurs on the
surface of the crypt wall in advance to the
movement direction ,
 while bone apposition by osteoblastic activity
occurs on the crypt wall behind it.
 2-Eccentric growth During root growth, there
is only bone resorption on the surface of the
crypt that faces the growing direction of the
tooth germ

8. Eruptive Phase
 (Pre-Functional Eruptive Phase )
 STARTS : at the time of root formation
 ENDS : when the tooth has reached the
occlusal plane.

9. The Eruptive Stages
 1- Intraosseous
stage
 The eruptive
movement occurs
within the bony
crypt
 2- Supraosseous
stage
 The eruptive
movement occurs
within the
connective tissue of
the oral mucosa.
 The movement is
faster than before

10. Histological Changes
 Intraosseous stage
 Root Formation
 Periodontal Ligament Formation
 Alveolar Bone Formation
 Supraosseous stage
 Dentogingival Junction Formation
 Gubernacular Cord and Canal Formation

11. Post-eruptive Phase
 (Functional Eruptive Phase )
 STARTS : when the teeth reach occlusal
plane & continues as long as they
remain in the oral cavity

12. Histological Changes
 In this stage, the root, the periodontal
ligament & The alveolar bone continue
their formation.
 The teeth are subjected to 2 movements
Occlusally & Mesially
 The erupting teeth is influenced by the
surrounding environmental factors that
help in to determine the final position in
the oral cavity (e.g. muscles forces &
childhood habits) (Thumb suckling habits)

17. References
 Antonio Nanci: Ten cat`s Oral Histology:
Development, Structure, and Function,
8th ed. Elsevier Health Sciences, Mosby,
20`3
 Bhasker, S.N.: Orban’s Oral Histology
and Embryology, Edition By G.S. Kumar,
Mosby 13th ed. 2011

18. Any question ?