Eruption and Shedding Flashcards
What are the 5 physiologic tooth movements?
1-Pre-eruptive 2-Eruptive 3-Post eruptive 4-Shedding 5-Avulsion
What is the main goal of tooth movement?
To get teeth into occlusion and maintain it
Where do permanent teeth develop in relation to primary teeth?
Lingual to them
T or F: Both permanent and successional teeth develop in the same crypts?
Both true and false. They start our in the same crypt but eventually separate into different crypts
Which direction do maxillary and mandibular molars point before eruptions?
Maxillary point buccally or distally
Mandibular point lingually or medially
How to pre-eruptive movements occur?
The entire crypt has to move and it does this by bone resorption and deposition moving the tooth into the proper location
What is directional/eccentric and bodily movements?
Bodily is when the entire crypt moves
Directional/eccentric involves just osteoclasts to make the crypt bigger so the tooth can continue to grow
How does the tooth erupt through the oral epithelium?
The REE on the surface of the tooth fuses with the oral epithelium to create a channel.
What is the gubernacular canal?
It is a channel through which the permanent tooth descends. It forms along the remnant of the dental lamina attached to the lamina propria (gubernacular cord)
What are the 4 theories that drive tooth eruption?
1-Bone remodeling theory
2-Root growth theory (no roots need for tooth to erupt)
3-Vascular pressure theory (even without vascular supply the teeth still erupt)
4-Cusion hammock theory (magic ligament)
What is the current understanding on how a tooth erupts?
The PDL pulls against each other and collagen to create the pressure to pull the tooth out.
What is critical for tooth eruption?
The dental follicle. It initiates bone resorption and the breakdown of soft tissues allowing eruption. REE might have a similar role in signaling when the tooth is “ready”
What are the three reasons for post eruptive movements?
1-accomodate growing jaw
2-componsate occlusal wear
3-componsate interproximal wear
What is hyalinization?
Damage to cells in the PDL, loss of cells=no remodeling
What fiber is particularly important in moving the teeth together?
The transeptal fibers
