Direct Filling Gold Materials

what kinds of materials are used for direct restorative procedure

1) direct filling gold materials

2) amalgam materials

3) resin-based composite materials

what kind of materials are used for indirect restorative procedure

1) casting gold alloys

2) ceramic materials

3) porcelain fused to metal

example of direct gold restorations

what are the 3 classifications of direct filling gold materials

1) foil gold: sheet form - mechanical

2) mat gold: electrolytic precipitate form

3) powdered gold - physical method

watch manufacturing video :)

manufacturing of foil gold pt 1

manufacturing of foil gold pt 2

what are the 3 forms of electrolytic precipitate gold

1) mat - granular form, by sintering

2) mat foil - Au/powder/Au, strip form

3) alloyed - with 0.1% Ca, dispersed strengthening

what are the general characteristics of gold

1) malleable

2) noble metal

3) high tarnish or corrosion resistance

4) welding of increments together by compaction or condensation

direct gold restorations will be successful if care is given to an exact technique in what 2 areas

1) cavity design and preparation

2) material manipulation

powdered gold manufacturing

physical method: atomization

particle size: average 15 um

what are the 3 beneficial characteristics of direct gold restorations

1) excellent marginal integrity

2) superb compatibility

3) long lasting result

direct gold filling materials are manufactured for _____________ directly into prepared cavity

compaction

properties of direct filling gold materials

hardest: mat + gold foil

higher flexural strength: gold foil

cold working or strain hardening

gold manipulation: _______ results with a clean surface by metallic bonding

welding

what are the 6 advantages of direct gold restorations

1) insoluble in oral fluid

2) no tarnishing or corroding

3) good marginal adaptation

4) soft tissue compatible

5) long term cost is low

6) harmonious with tooth color

direct gold restorations: cavity design and preparation

direct gold restorations: instruments

direct gold restoration examples

what kind of gold manipulation can we do to remove contaminants from the gold

degassing or annealing (but do not use bunsen burner and gas!)

heat treatment - annealing of gold restorations

what are the requirements for proper compaction of direct gold restorations with malleting forces

1) hand pressure: 6-8 lbs

2) mechanical pressure: 15 lbs

3) condensing point: 0.5 mm^2

cold working/strain hardening of direct gold restorations

occlusal cavity restoration with direct gold restorations

more examples of direct gold restorations

what are the 4 disadvantages of direct gold restorations

1) technique sensitive: instruments, working field, thermal shock & pulpal response due to insertion procedures

2) low surface hardness

3) esthetic problem

4) higher initial cost

6 characteristics of direct gold restorations

1) can be placed in one appointment

2) superior marginal seal

3) good tissue response (very little tissue irritation)

4) insoluble and resistant to tarnish

5) no tooth discoloration as in old amalgam restorations

6) a very long lasting restoration

example of higher initial cost disadvantage of direct gold restorations pt 1

example of higher initial cost disadvantage of direct gold restorations pt 2