frame materials metal

Question 1

filled gold

Answer 1

soft and resistant to corrosion

keeps colour

Question 2

rolled gold

Answer 2

soft and resistant to corrosion

has a base metal core

Question 3

nickel silver

Answer 3

electroplated 
common metal frame
cheap
easily adjusted 
flexible

Question 4

nickel titanium

Answer 4

only used for bridges and sides

Question 5

stainless steel

Answer 5

electroplating
strong and resistant
hypoallergenic
corrosion resistance

Question 6

aluminium

Answer 6

anodising 
expensive
light
hard to adjust
hypoallergenic

Question 7

titanium

Answer 7

ion plated
expensive
hard to repair
flexible
corrosion resistance