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MODULE 5 MATERIALS > SS and NiTi in endo > Flashcards

SS and NiTi in endo Flashcards

1
Q

what is the ISO specification for dentistry

A

ISO 3630-1, 2019

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2
Q

Types of instruments

A

standard instrument (taper 0.2)
taper instrument (uniform taper)
non taper instrument (cylindrical)
variable taper (more than one taper in working part)
shape instrument (contoured working part)

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3
Q

what is a hedstrom file

A

only cuts on retraction

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4
Q

temperature dependant phases of NiTi

A

austenitic - high temp
martensite - low temp
r-phase - intermediate temp

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5
Q

what phase is niti file in the canal

A

martensitic

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6
Q

what phase is niti file when removed from canal

A

austenitic

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7
Q

how are niti files manufactured

A

from niti wire

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8
Q

examples of 5th gen niti files (2013)

A

wave one gold
protaper next
reciproc blue

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9
Q

what is the standard taper

A

0.02

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10
Q

describe the taper on a taper instrument

A

uniform taper

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11
Q

what shape is non taper instrument

A

cylindrical

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12
Q

what is variable taper

A

more than one taper in working part

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13
Q

what part of the endodontic instrument is the cutting surface?

A

working part

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14
Q

what part of the endodontic instrument is the part that fits in the handpiece?

A

shank

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15
Q

what part of the endodontic instrument is from the tip to the handle/ shank?

A

operative part

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16
Q

what type of protaper files have a non active tip?

A

protaper universal

17
Q

what type of protaper file has an active tip?

A

protaper retreatment

18
Q

what do you call the cutting angle?

A

effective rake angle

19
Q

what is stiffer: NiTi or SS?

A

SS

20
Q

what is more flexible: NiTi or SS?

A

NiTi

21
Q

how are SS Hedstrom files manufactured?

A

microgrinding

22
Q

how are SS Kfiles/ reamers manufactured?

A

from raw ss wire. ground then twisted counter-clockwise

23
Q

what is cheaper: ss or NiTi?

A

SS

24
Q

describe memory shape

A

the file keeps martensitic phase when stress causes permanent deformation
if heated again, it will return to original austenitic phase

25
Q

what is more brittle: martensitic or austenitic?

A

martensitic

26
Q

what has a higher modulus of elasticity: austenitic or martensitic?

A

austenitic

27
Q

how does austenite transform to martensite?

A

stress or heat

28
Q

explain superelasticity of NiTi files

A

file changes from austenitic to martensitic when inserted into canal
as soon as it is removed from the canal it returns to austenitic

29
Q

explain memory shape

A

if the temperature that the file is under is stable for the martensitic phase, the stress causes permanent transformation
the file would need to be heated again to return to an austenitic phase

MODULE 5 MATERIALS (7 decks)

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