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Tooth Eruption

Dr. Mahmoud Bakr

School Of Dentistry and Oral health

Griffith University

Member of the Australian Dental Association (ADA),

Australian Biology Institute Inc. (ABI), and the Egyptian

Dental Union (EDU).

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Tooth Eruption

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Eruption of Teeth

Axial or occlusal movement of teeth (or teeth germs)

Their developmental position in the jawTo

Their functional position in the oral cavity

From

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Phases of Eruption

Pre-eruptive

phase

Eruptive

phase

Post-eruptive

phase

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Phase

When itstarts & ends

Ongoingevents

Type ofmovement

Phases of Eruption

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Types of ToothMovement

Axial

movement

Bodily

movement

Tilting

(tipping)

Rotatory

movement

Occlusal

movement inthe directionof the longaxis of the

tooth

Movement toone directionmesial,distal

Buccal orlingual

Movementaround a

transverse

axis

Movementaround a

longitudinalaxis

Eccentricgrowth

Shift of

The center

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Starts: Ends: Events: Type of

movement

Pre-eruptive Phase

End ofearly

bell

Beginningof rootformation

Jaw growth: In length In width In height

Eccentric growth

Bodilymovement

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Movement of Permanent Teeth

Anter ior Premolars

Pre-eruptive phase

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Pre-eruptive Phase

Permanent Molars

Maxillary molars

in the tuberosityfacing distally

swing with growthof the maxilla

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Pre-eruptive Phase

Permanent MolarsMandibular molars

in the base of the ramus

facing mesially

tilt to be upwright

with growth of themandible

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Eruptive PhaseStarts: Ends: Events: Type of

movementOnset of

root

formation

Appearanceof tooth in

the oral

cavity

Root formationDevelopment of PDLDevelopment ofdentogingival junction

Al l types of

movements

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ERUPTION PATH GUBERNACULAR CANAL :

As tooth predecessors erupt the

successors tooth germs lie in their

own bony crypt which entirely enclosed

by bone except for a small canal

known as GUBERNACULAR

CANAL .

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ERUPTION PATH

In the anterior teeth ,thesecanals are seen in thelingual plate of bone

while in premolars thecanals are present in thecrypt of the correspondingdeciduous molars.

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GUBERNACULAR CORD

The Gubernacular canal contains remnants of

dental lamina and connective tissue termed as

Gubernacular cord.

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3) Post- eruptive phase:

Begins.when tooth reaches occlusal plane

Endsat the end of life span of the tooth

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Eruption Hematoma

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Teeth at 6 years old

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Crowded lower anterior teeth due

to lack of space

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Lower second premolar erupting under

lower E

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Full permanent dentition 2nd,3rd molars

Un-eru ted

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