Quick review on Biomechanics

Consideration of the forces inherent in the oral cavity includes

Direction, duration, frequency and magnitude

Selection and location

An appropriate design includes the ———— and ———— of components in conjunction with a harmonious occlusion.

Dental implant

What reduces or eliminate the force magnification of the denture base or what eliminates the leverage system?

Implant

What is the most beneficial movement control for a prosthesis movement?

Involves resisting instability by improving support

What is the greatest benefit of an implant?

Simple and complex machines

What are the two general categories of machines?

Complex machines

A machine that is or are combination of many simple machines

Lever wedge screw wheel and axle pulley and inclined plane

Give the six simple machines

lever, wedge, inclined plane

What are the simple machines that should be avoided in the removable partial denture designs?

Lever

It is a rigid bar supported somewhere along its length

Fulcrum

What do you call the support point of the lever?

Fulcrum

The lever can move around the?

abutment teeth

Even though the actual movement of the denture may be small, a lever force may be imposed on?

Cantilever

It is a beam supported at one end and that acts as a first class,lever

vertically directed forces

What is forces does the tooth are better to tolerate?

Stabilizing and retentive components

What is extremely important to prevent rotation of the denture in relation to the horizontal axis of rotation of the abutment?

abutment teeth

What will better tolerate non-vertical forces if these forces are applied as near as possible to the horizontal axis of rotation of the abutment

To tissue supported prosthesis because of reliance on the distal extension supporting tissue to share the functional loads with the teeth

Where is the greatest movement possible found in?

Towards the anteriorly placed components

As the distal extension base moves away from the supporting tissue, where will the force be?

The tissue of the residual ridge, accuracy of the fit of denture base, occlusal load applied.

The first movement are resisted by the following

Indirect retainers

What afford the best possible leverage against lifting of the distal extension base?

Most posterior abutments

The first movement is the rotation about an access through the?

Longitudinal axis of rotation about the residual ridge

The second movement is a rotation about a?

Second movement

What movement can cause horizontal shifting of the denture base?

crest of the residual ridge

What is the fulcrum of the second movement?

Most posterior abutment

What is the fulcrum of the first Movement?

Stabilizing components and the intracoronal rest

The third movement is resisted by ?

Second movement

What movement causes unilateral movement when showing and the other side, the other end should still be rigid to support with?

Diagonal and horizontal occlusal forces

What makes the third movement occur?

The rest on the abutment teeth

In a support that partial denture, how do we prevent the movement of the denture base towards the Ridge?

Direct retainers

Movement away from edentulous Ridge is prevented by?

Tooth supported denture

The first of the three possible movements can be controlled in what denture?

3rd

What movement is possible in all partial dentures?

Tissue ward movement

Occlusal rest provides resistance to what movement?

Steep vertical wall, inclined plane

What should we prevent when preparing for an occlusal, rest?

Intracoronal rest.

In tooth supported denture, it is permissible to use this rest because it does not only provides a occlusal support but also provides horizontal stabilization.

Resisting Horizontal movement or 3rd movement.

Intracoronal rest is for?

Residual ridge

Is the class III and class IV partial denture is extensive then they might need support form

3rd(horizontal)

What is the only movement that the class III classification can possibly occur?