Orthodontic Tooth Movement

What is the characteristic of a pure translation movement?

Pressure areas on the apex of the tooth

All PDL surface with the same pressure (correct)

Different pressure areas on the PDL surface

No pressure area on the PDL surface

Which type of movement requires very light forces and is considered very dangerous?

Intrusion (correct)

Rotation

Torque

Extrusion

What is the characteristic of a torque movement?

Controlled tipping movement of the crown

Mass or bodily movement of the tooth

Controlled tipping movement of the root (correct)

Pure rotation of the tooth

Which type of movement can be achieved with both removable and fixed appliances?

Intrusion Signup and view all the answers

What is the characteristic of an extrusion movement?

Bone formation occurs all along the extrusion Signup and view all the answers

What is the force range required for a torque movement?

100-150 gr Signup and view all the answers

What happens to the blood vessels within the PDL when heavy forces are applied for 3-5 seconds?

They are completely occluded on the pressure side Signup and view all the answers

What is the result of cell death in the compressed area after hours of heavy force application?

Cell death in the compressed area Signup and view all the answers

What type of resorption occurs when osteoclasts come from far away to rescue the tooth?

Tunnel resorption Signup and view all the answers

When does tooth movement typically occur in response to heavy force application?

After 7-14 days Signup and view all the answers

What is the result of the application of continuous heavy forces for less than 1 second?

Piezoelectric signal is generated Signup and view all the answers

What is the term for the type of resorption that occurs when the tooth begins to move?

Undermining resorption Signup and view all the answers

What is the primary difference between frontal resorption and undermining resorption?

Location of osteoclasts Signup and view all the answers

What occurs within the first 4 hours of continuous force application?

Increased cAMP levels are detectable Signup and view all the answers

What happens to the blood vessels within the PDL between 3-5 seconds of continuous force application?

They are partially compressed on the pressure side and dilated on the tension side Signup and view all the answers

What is the result of the 2nd wave of osteoclasts in frontal resorption?

Remodeling of the bony socket Signup and view all the answers

At what time interval does tooth movement typically begin?

2 days Signup and view all the answers

What is the effect of < 1 second of continuous force application on the PDL?

PDL fluid is incompressible, alveolar bone bends, and a piezoelectric signal is generated Signup and view all the answers