Lecture 5 Flashcards
What is the bony response mediated by in tooth movement?
-PDL
Under normal circumstances the PDL occupies a space of what width?
-0.5 mm
The PDSL contains what cellular elements?
- Mesenchymal cells (multipotent stromal cells)
- Fibroblasts
- Osteoblasts
The collagen of the PDL is constantly being remodeled and renewed by what?
-Fibroblasts and fibroclasts
T/F The PDL does contain blood vessels
True
Active stabilization of teeth is produced by what?
-Metabolic effects in the PDL
Active stabilization of the PDL implies what?
That there is a threshold for orthodontic force
What are the two unusual characteristics of Piezoelectric signals?
- A quick decay rate
- Equivalent signal opposite in direction of the first spike when force is released
What is piezoelectricity?
-A phenomenon observed in many crystalline materials in which deformation of the crystal structure produces a flow of electric current.
What causes the two unusual characteristics of piezoelectric signals?
-Migration of electrons from on location to another when the crystal structure is deformed
Without the piezoelectric currents or stress generated signals what occurs?
-Bone mineral is lost and general skeletal atrophy ensues
