Eruption

By: A.RashedM.Assistant Professor of Pediatric Dentistry

How eruption happens?!

• Elongation of tooth root• Forces exerted by vascular tissues around the

tooth• Hormonal influnces• Alveolar crest resorption• Growth and pull of periodontal membrane• …

Eruption and tooth development.

1. the crown cal. Completes the tooth begins its migration

2. 2/3 of root cal. Completes the tooth emerges into soft tissue

3. ¾ of root cal. Completes the tooth emerges into oral cavity

Why does emergence of teeth happen at different times?

Eruption?!Emergence?!

Problems associated with eruption in primary teeth

Illingworth and Tasanen study:

YES NODaytime restlessness InfectionFinger sucking Temperature riseRubbing of the gum DiarrheaIncrease in drooling CoughingSome loss of appetite Sleep disturbances

What if signs not related to eruption be mistaken as eruption signs?!

What can we do to releive pain and difficulty?

What is this?!why does it happen?

Treatment?

Shedding of primary teeth,eruption of permanent teeth

Overretained primary teeth

why may primary teeth over retain?

How should they be treated?

What do you see?What should we do?

What do you see?What should we do?

What do you see?What should we do?

Ankylosisinfraocclusion

Are all ankylosed teeth, necessarily infraoccluded?

Are all infraoccluded teeth, necessarily ankylosed?

How can infraocclusion and ankylosis be differentiated?

1. Radiographs

2. Percussion test

What problems may infraoccluded teeth cause?

Treatment in primary teeth?

1. With successor

2. Without successor

Major contrasts between primary and permanent teeth

1. Anterior teeth: higher crown width (M-D)/ crown length

2. Anterior teeth: narrower and longer roots with wide crowns (cervical third view)-comparatively-

3. Primary molar: slender and longer roots that flare beyond the outline of the crown –comparatively-

There is no trunk, each root directly comes from the crown

4. More prominent cervical ridge: buccal, lingual, labial

5. Primary molar: more slender at their cervical portion mesiodistally (bulby)

Major contrasts between primary and permanent teeth

6. Primary molar: : buccal and lingual surfaces are flatter which result in a narrower occlusal surface (bulby)

7. Primary molars: Buccal cervical ridges are much more

pronounced especially ‘D’

8. Less pigmentation, and whiter

9. The pulp chamber is relatively larger in all dimensions, pulp horns are high

10. The enamel is relatively thin, the dentine thickness is limited

11. Primary teeth are smaller than permanent teeth

Lunch and sleep!