Objectives redo pt2

Which metallic material has high ductility and malleability

Gold

Why is gold such a highly rated product in DM?

Can fit into thin margins

Absorb energy without fracturing

Toughness

Materials’ ability to absorb energy while it is elastically deformed+release that energy when force is removed

Resilience

“absorb energy + return to OG shape”

Resilience

Tendency of material to fracture w/ little or no plastic deformation

Brittleness

Very week under tensile forces

Brittleness

Think of _______ as “i’d rather crack than bend”

Brittleness

Give two examples of materials that are very brittle

Porcelain and ceramics

Material becomes less viscous/thinner when agitated or increase in movement, becomes viscous again when movement is decreased

Thixotropy

Differentiate between therapeutic, preventive, and restorative materials.

Preventive: prevents the problem

Therapeutic: treats the problem

Restorative: repairs the problem

List and describe the three main types of restorative dental materials.

Metals and alloys

• gold

• stainless steel

• amalgam

Ceramics

• porcelain

• dental ceramics

Polymers

• plastics

• composite resin

• acrylic

Describe the reaction stages a material undergoes to acquire its final state.

1. mixing time: time needed to combine materials

2. working time: material can still be manipulated and used easily

3. initial set: material begins to harden and is no longer workable

4. final set: material has reached final hardened state

Identify the variables in the manipulation of a material

• ratio of components

• variability vs. strict adherence

• temp+humidty

• method+other materials involved