3/2/17 Eruption and Shedding TEST #3 Flashcards
What phase of physiologic tooth movement deals with the positioning of tooth germs prior to eruption?
-Preeruptive
What phase of physiologic tooth movement deals with the movement of the tooth into functional occlusion?
-Eruptive
What phase of physiologic tooth movement deals with the movements in compensation for the growth of the jaws/wear. Meant to keep the tooth in occlusion.
-Posteruptive
What phase of physiologic tooth movement deals with the programmed loss of the primary teeth to make way for the permanent dentition?
-Shedding
What is an Avulsion?
-An extreme example of non physiologic tooth movement (punched in the face or falling on your face)
Where do the successional dental lamina form?
-Lingual to primary tooth germs
T/F AS the mandible/maxilla grow, tooth germs have to shift around
True
What are two possibilities of how the tooth germ moves?
- The whole tooth germ moves
- Directional growth
Where do pre eruptive movements take place?
-Boney crypts
What are pre eruptive movements associated with?
- Bone resorption
- Bone deposition
T/F Eruptive tooth movements are axial or occlusal
True
The fusion of what two structures create an epithelium lined channel through which the tooth emerges?
- REE
- Oral epithelium
T/F Permanent successional tooth forms in a second bony crypt under the primary tooth
True
There is a channel which develops between the alveolar bone around the primary tooth an the permanent tooth as it erupts. What is the name of this canal?
-Gubernacular canal
What erupts through the gubernacular canal?
-Permanent tooth
T/F Eruption occurs faster in bone than in the soft tissue
False
-It occurs faster in the soft tissue and slower in the bone
What are four theories of the forces that generate eruption of the teeth?
- Bone remodeling theory
- Root growth theory
- Vascular pressure theory
- Cushion Hammock theory
What theory of eruption is when bone deposits under an erupting tooth propelling it outward?
-Bone remodeling theory
What theory of eruption is when root formation pushes the tooth outwards?
-Root Growth theory
What theory of eruption is when blood vessels at the tooth apex push it outwards via hydrostatic pressure?
-Vascular Pressure theory
What theory of eruption is when a magic ligament under the tooth pushes it out?
-Cushion Hammock theory
T/F Currently, it is though the periodontal ligament, developing after root formation is the driving force for tooth eruption
True
T/F Rootless teeth can not erupt
False
-The tooth can still erupt
What is critical for tooth eruption?
-Dental sac (follicle)
