Tooth exfoliation Flashcards
What happens to a permanent tooth when its corresponding deciduous tooth erupts
The permanent tooth develops further a walll of bone which divides the socket into 2
Eventually the permeant tooth is completely enclosed in its bony crypt
Which area of the permeant tooth is not surrounded by its own bony crypt?
gubernacular canal’
What is the gubernacular canal’
An opening where bone has failed to form on unerupted permeant teeth
It is where the dental lamina originally existed
As the unerputed permeant tooth continues to grow and erupt what happens
Pressure is applied to the wall of bone and as a result osteoclasts are recruited and the bone begins to resorb
What is the area where bone resorption of erupting teeth called
Resorbing organs of Tomes
What happens as the tooth continues to grow and erupt
Eventually complete loss of the intervening bone palate occurs and resorption of the root cementum and dentine of the deciduous tooth
What are the cells that degrade the tooth called
Odontoblasts or dentinoclasts
What are odontoblasts/ dentinoclasts identical to
Osteocalsts
Describe how a deciduous tooth falls out
Eventually the permeant tooth comes into a position directly under the deciduous tooth
The deciduous tooth has very little root and supporting periodontal ligament
Occlusal forces increases as a child grown and eventually a critical point is reached when the tissue ruptures and the tooth falls out
Which teeth exfoliate and erupt in a slightly different way to the rest
Pre molars
Where do premolars develop
The pre molars develop between the splayed roots of the deciduous molar
Why do premolars erupt in a different way to the other teeth
Due to their developmental position (between molar roots) their are multiple. areas of respiration that can occur on the roots of the deciduous molars
Moreover the general growth of the alveolar bone can carry the deciduous tooth away from is successor which temporarily removes the pressure needed for eruption
What can sometimes happen during premolar eruption and why
Because of the splayed nature of the roots of deciduous molars sometimes resorption process will miss the most apical root fragment causing that to stay in the tissue even after the tooth has been lost
What happens if the most apical root of a deciduous molar isn’t resorbed
They may later be exfoliated themselves or become ankylosed within the bone or eventually completely resorbed.
What can happen if occlusal load isn’t great enough for tooth eruption
The deciduous tooth may be retained into adulthood
