SURGICAL SCREWS Flashcards
1
Q
device used for converting rotational force into linear motion
A
screw
2
Q
the linear motion we are looking for is how many degrees relative to the fracture line?
with lag tech. we get?
A
90 degrees
compression
3
Q
T/F, can we use screws to fixate plates to bones?
A
T
4
Q
why is Cr or Ti added?
A
corrosion resistance
5
Q
whats in stainless steel?
A
Cr, Ni, Mo, Mg, P,S, Si
6
Q
not as elastic, doesn’t resist plastic deformation?
A
titanium
7
Q
this is protective layer of oxide on metal surface?
mech erosion is called?
A
passivization, avoid scratching the surface
fretting
