Ortho Lec 1st quiz Flashcards
(43 cards)
what are the 2 kinds of tooth movement?
- Physiologic tooth migration
- Orthodontic tooth movement
This is the movement of the tooth as part of normal processes in growth and development.
Physiologic tooth migration
Naturally occurring tooth movements take place during and after ___
Tooth eruption
why?
-There is no application of any orthodontic forces and yet the tooth is moving due to the presence of physiologic force.
FACT : The physiologic force is said to be equivalent to the capillary pulse pressure that is 20-26 g/cm2 of root surface.
Examples of physiologic tooth movement are mesial drifting, eruption, and changes in tooth position during mastication.
Orthodontic tooth movement, on the other hand, is brought about by _____ which varies according to the type of movement desired.
orthodontic force
how orthodontic tooth movement occurs? there should always be an___
- Pressure (PRESSURE SIDE)
- Area of tension (TENSION SIDE)
Where the tooth is moving to ___
Pressure side
Behind the movement is ____
Tension side
Osteoclasts are present in ___
Pressure side
Osteoblasts are present in ____
Tension side
Bone resorption occurs in ___
Pressure side
Bone deposition occurs in
Tension side
_____ is a phenomenon observed in many crystalline materials in which a deformation of the crystal structure produces a flow of electric current as electrons are displaced from one part of the crystal lattice to another
Piezoelectricity
Bone mineral and collagen are ___
piezoelectric
means?????
they can be moved by electric signals.
Piezoelectric signals have two unusual characteristics: and these are
- a quick decay rate, and
- the production of an equivalent signal, opposite in direction, when the force is released.
The periodontal ligament (PDL) is composed of a _______ that surrounds the tooth root and connects it to the inner wall of the alveolar bone.
complex vascular and highly cellular connective tissue
It is a soft connective tissue that surrounds the root of a tooth occupying the space between the root of a tooth and the walls of the alveolar bone and that of gingiva.
complex vascular and highly cellular connective tissue
The functions of the periodontal ligament: in terms of supportive
Protective cushion
The functions of the periodontal ligament: in terms of formative
storehouse of cells
The functions of the periodontal ligament: in terms of Nutritive
source of nutrients
The functions of the periodontal ligament: in terms of Sensory
sensory plexus
Dentoalveolar unit, is consists of these and greatly affected by the orthodontic force applied
- Cementum
- PDL
- Alveolar bone proper
Light forces : Compressed PDL
Pressure side
Light forces : Fluid expressed from PDL space
Pressure side
