Physiological tooth movement : Mechanism of tooth erution and mesial drift

Question 1

Tooth movements

Answer 1

– Preeruptive
– Eruptive
-Posteruptive

Question 2

Preeruptive Tooth Movement

Answer 2

Made by deciduous and permanent tooth germs within tissues of
the jaw before they begin to erupt.

Question 3

Preeruptive Tooth Movement

for succesional permanent teeth

Answer 3

The successional permanent teeth develop:
- on the lingual aspect of their deciduous
predecessor anteriorteeth
-in between the divergent roots of the deciduous
posterior teeth.

Question 4

Preeruptive Tooth Movement

for non-succesional permanent teeth

Answer 4

• The non- successional permanent teeth develop from backward
extension of the dental lamina.
The maxillary molar tooth germs develop with
their occlusal surface facing distally and will
“straightened” only when maxilla has grown
sufficiently.
The mandibular molar tooth germs develop mesially
and will “straightened” only when the mandible has
grown sufficiently.
Bone remodelling takes place in the bony crypt
where for example,when a tooth moves mesially,
there will be bone resorption at the mesial region
and deposition at the distal region.

Question 5

Eruptive tooth movement (1)

Answer 5

• Made by a tooth to move from its position
within the bone of the jaw to its functional
position in occlusion

Question 6

Eruptive tooth movement (2)

Answer 6

The dental follicle retains its connection with the oral mucosa by a
strand of connective tissue known as gubernacular cord, found in
gubernacular canal. The canals are located on the lingual aspects of
the deciduous teeth. The gubernacular canal is widened rapidly by
osteoclasts resulting in an eruptive pathway for the deciduous teeth.

Question 7

Eruptive tooth movement (3)

Answer 7

The PDL develops only after root formation has been
initiated and once established, the PDL will be
remodeled by fibroblasts to accommodate
continued eruptive tooth movement