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MOD 5 ENDODONTICS > Endodontic materials > Flashcards

Endodontic materials Flashcards

1
Q

2 materials used for endo instruments

A

nickel titanium
stainless steel

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2
Q

what does the size of a hand instrument represent

A

the diameter of the tip

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3
Q

what size is the tip on a size 10 hand file

A

0.1mm

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4
Q

how much bigger is D16 to D0

A

0.32mm greater

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5
Q

what is the tip angle on a hand instrument

A

75 degrees

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6
Q

what is the taper on a SS hand instrument

A

0.02
2%

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7
Q

what does a taper of 0.02 mean

A

every 1mm towards the shank, the diameter increases by 0.02

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8
Q

what are the available lengths of SS files

A

21, 25 or 31mm

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9
Q

what is the consistent working length of SS hand file

A

16mm

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10
Q

what is the increase in diameter from file to file, from sizes 10-60

A

0.05mm

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11
Q

what is the size increase from file to file, from sizes 60 - 140

A

0.1mm

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12
Q

SS hand file metal composition

A

10.5% chromium

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13
Q

disadvantages of SS hand files

A

poor flex

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14
Q

advantages of SS hand files

A

dont corrode rust or stain

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15
Q

types of SS files

A

K file
flexofile
hedstrom file

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16
Q

what are barbed broaches used for

A

removing pulpal tissue - not suitable for narrow, curved canals

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17
Q

flexofile use

A

preparation of glide path
apical gauging
negotiating ledges

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18
Q

tip on a flexofile

A

nonaggressive (batt)

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19
Q

what motion are hedstroem files used in

A

up and down motion due to stiffness

20
Q

when are hedstroem files used

A

only in retreatment to remove GP or an overfilling of root canal

as the file cuts when moved in the coronal direction

21
Q

what do NiTi files require

A

torque control motor

22
Q

metal composition of NiTi

A

56% nickel
44% titanium

23
Q

what are the new NiTi files made of

A

M wire

24
Q

what are the 3 crystalline phases of M wire

A

deformed and microtwinned martensite
premartensitic R-phase
austenite

25
Q

advantanges of M wire

A

greater flex
increased safety

26
Q

by how much is cyclic fatigue improved with M wire

A

400%

27
Q

rotation speed and torque of proglider

A

300 rpm
torque 2

28
Q

what lengths are protaper gold instruments available in

A

21mm
25mm
31mm

29
Q

what is used as an interappointment medicament

A

non-setting calcium hydroxide paste

30
Q

pH of calcium hydroxide

A

12.5-12.8

31
Q

commercial names of CaOH

A

hypocal
ultracal

32
Q

symptoms of a canal with exudate

A

TTP and tender to percussion
discharge present at each canal opening

33
Q

apexification

A

open apex tooth is filled with calcium hydroxide to stimulate the formation of a hard tissue barrier at the apical portion of the root

34
Q

indications for apexification

A

vital radicular pulp in an immature tooth pulpotomy
if vital pulp tissue is present apically
pulpless immature tooth with or without periapical radiolucency
horizontal root fracture (80% success)

35
Q

what is used for apexification

A

mineral trioxide aggregate

36
Q

what would be used to induce hard tissue formation in the presence of iatrogenic perforation

A

CaOH

37
Q

Internal resorption tx

A

if not perforated - extripate pulp, dress CaOH, obturate with warm GP

if perforated - defect sealed, surgically or with MTA

38
Q

what does internal resorption present as

A

pink spot

39
Q

types of external resorption

A

surface resorption
inflammatory resorption
replacement resorption
pressure resorption
systemic resorption
idiopathic

40
Q

tx for non vital immature permanent incisors

A

apexification
apical barrier
revascularisation

41
Q

GP composition

A

19-22% gutta percha
59-75% zinc oxide
waxes, coloring, antioxidants and metallic salts

42
Q

what is GP

A

trans isomer of polyisoprene (rubber)

43
Q

what are the 2 forms of GP

A

beta phase - solid
alpha phase - heated, becomes soft

44
Q

GP disadvantages

A

shrinkage on cooling
poor adhesion to dentine
cant be heat sterilized

45
Q

types of sealers

A

zinc oxide eugenol
calcium hydroxide
GI
epoxy resin

46
Q

Types of calcium silicate cements

A

1st gen - MTA
2nd gen - biodentine, bioaggregate

47
Q
A

MOD 5 ENDODONTICS (14 decks)

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