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ENDOOOO > Endo-Access, Cleaning, Shaping, Obturating > Flashcards

Endo-Access, Cleaning, Shaping, Obturating Flashcards

1
Q

What is the material for removing the smear layer?

A

EDTA

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2
Q

What is possibly the most demanding part of a root canal?

A

Access!

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3
Q

Access: the walls should ______ toward the occlusal and try to achieve ______ line access

A

diverge…straight

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4
Q

What burs can we use to look for oraficies?

A

Mueller burs!

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5
Q

Back to anatomy I guess…What % of mand anteriors have 2 canals?

A

41%!!!

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6
Q

MB2 is ALWAYS ______ and _____ compared to MB1!!!

A

Palatal and MESIAL

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7
Q

More anatomy-what % of Maxillary molars have 4 canals?

A

90-95%

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8
Q

What shape should your mand 1st PM have? What are my chances of finding a second canal?? (i experienced this first hand)

A

ovoid…35%

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9
Q

When accessing, make sure to remove ALL sources of _______

A

bacteria

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10
Q

The pulp chamber of a tooth is always located in the _______ of the tooth at the level of the ______

A

CENTER…CEJ

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11
Q

The ORIFICES of the canals are ALWAYS located at the junction of the _____ chamber floor and the _______ chamber walls!

A

DARK floor….LIGHT walls

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12
Q

The orifices of canals are usually located at the ______ of the “dark” floor angle.

A

vertex

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13
Q

The orifices of the canals are SYMMETRICAL with respect to a line drawn in a _____-______ direction at the level of the _____

A

Mesio-Distal direction at the CEJ

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14
Q

The orifices of canals are _______ with respect to each other

A

SYMMETRICAL

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15
Q

There is 1.0 x 10^__ to 1.0x10^__ bacterial cells in the infected root canal, ______ instrumentation reduces the number 100-1000 fold

A

10 to the 2nd to 10 to the 8th

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16
Q

Purpose for IRRIGATION! Wetting the canal walls and flushing of ______ from the canal

A

debris

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17
Q

Purpose for IRRIGATION! Destruction of ________

A

microorganisms

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18
Q

Purpose for IRRIGATION! Dissolution of ______ matter

A

organic

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19
Q

Purpose for IRRIGATION! Removal of the ______ layer and softening of ______

A

SMEAR….dentin

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20
Q

Purpose for IRRIGATION! to clean mechanically ________ areas

A

inaccessible

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21
Q

ANTIMICROBIAL effects of Irrigants-________ introduced as an Endo tx by Coolidge in 1919.

A

Sodium Hyp-O-Chlor-ITE

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22
Q

ANTIMICROBIAL effects of Irrigants-NaOCl shows SUPERIOR ________ action

A

antibacterial

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23
Q

ANTIMICROBIAL effects of Irrigants-NO difference seen in efficacy between ___ and ___ %

A

0.5 and 5%

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24
Q

ANTIMICROBIAL effects of Irrigants- Copious irrigation with NaOCL in conjunction with mechanical instrumentation eliminated bacteria in ___% of cases in controlled studies

A

50%

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25
Q

What size needle do we use to irrigate with?

A

27g

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26
Q

YOU need to be VERY CAUTIOUS not to force irritants out the _____ of the root!

A

APEX

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27
Q

What are the two “appropriate” irrigants?

A

NaOCl & EDTA

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28
Q

Whats the typical [ ] of NaOCl used in dentistry?

A

5.25% or 2.6%

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29
Q

What are the two functions of NaOCl?

A

1.Anti-bacterial 2.Dissolves tissue

30
Q

What are the two functions of EDTA? What is it used in conjunction with?

A
  1. Chelating agent 2.REMOVES SMEAR LAYER….used in conjunction with NaOCl
31
Q

What type of temperature should the irrigant be?

A

Warm..remember his coffee pot trick?

32
Q

EXAM Q: What are the two functions LUBRICATION do NOT do?

A

Lube does NOT kill Bacteria nor Remove Debris..its for friction reduction and its a chelating agent

33
Q

What does EDTA stand for?

A

Ethylene Di-amine Tetra-acetic Acid

34
Q

PROLUBE is what type of chemical?

A

Carbamide Peroxide

35
Q

What are the 6 steps for the final EDTA technique?

A

1.Irrigate with NaOCl 2.Evacuate NaOCl 3.EDTA in 4.Evacuate EDTA 5.Rinse with NaOCl 6.Final since with water

36
Q

NOTE: “It’s MORE important what you get ____ of the canal than what you put ___”

A

GET OUT….put in

37
Q

Our .02 files are made of

A

stanless steel

38
Q

Our .04 and .06 files are made of

A

nickel titanium

39
Q

With a 16mm diameter file with an .02 taper you will see a ____mm change

A

.32 (16 x .02)

40
Q

Stainless steel advantages: ________ and _______ resistant, flexible, good bio_______

A

corrosion and fracture resistant….biocompatable

41
Q

The #2 Gates Gladden drill is designed to break at the ______ vs the #1 GG can break at the _____

A

2 at the shaft/shank….#1 at the tip

42
Q

The primary goal of canal preparation is to shape the canals from the orifice to the apical constriction in a continuously ______ form to thoroughly clean the space and aid in filling the canal space.

A

tapering

43
Q

We will be utilizing a modified passive step _____ & crown ______ technique

A

STEP BACK & CROWN DOWN

44
Q

The radiographic length is not the actual but an estimated length. You should subtract approx. ___to____ mm from this measurement

A

1to1.5mm

45
Q

A _______ force technique works in both directions. First rotated ___ degrees clockwise, then ____ degrees with apical pressure.

A

BALANCED force…..180 degrees…120 degrees w. pressure

46
Q

Oh crap. Slides say minimum of _____ after rotary, but manual says ______…

A

30.04…. 35.04

47
Q

Instrument fatigue-BOTH how many ____ you use the file AND how the file was _____

A

times…used

48
Q

Minimize Fx-use plenty of _____/____…..establish a _____ rest…

A

irrigation/lubrication….finger rest

49
Q

Minimize Fx-Only use rotaries to point of divergence/_____spots…use a _____ motor!

A

trouble…torque

50
Q

What type of motion is used with the motor rotary files?

A

pecking motion

51
Q

When starting out with the rotary, stay ___mm short of working lenght

A

5mm oops, never did that

52
Q

THE MINIMUM SIZE for the APICAL PORTAL OF EXIT is a ___.04 taper or .06 taper file.

A

30.04

53
Q

What can you fix a strip perf with?

A

MTA

54
Q

HEY DUMBASS. Never FIT GP in a ____ canal.

A

DRY. haha if you fucking read, Dr. L won’t think your a dumbass.

55
Q

Before obrutation, the Pt should be _______ to purcussion

A

asymptomatic

56
Q

If the canal has been cleaned out properly, you can fill it with sterile ______ and it will turn out fine.

A

bird crap

57
Q

What are the two obturation materials?

A

1.Solid core-GP 2.Sealer

58
Q

What are the three types of CORE obturation materials?

A

1.GP-predominant 2.Silver points-pure silver 3.G.I.-for strengthening a cracked tooth!

59
Q

Properties of GP-Minimal _____ toxicity, _____-like material that adapts to irregularities in prepared canals, easily _______ mechanically or with solvents

A

tissue….latex….removed

60
Q

Properties of GP- DOES NOT ______ to dentin!!!, DOES NOT provide impermeable ______

A

ADHERE…seal

61
Q

EXAM QUESTION: What are the three components of GP?

A

1) 75% ZINC OXIDE 2) 20% Gutta Percha 3) 5% Other

62
Q

3 components of GP- Gutta Percha provides _______

A

plasticity

63
Q

3 components of GP- Zinc Oxide provides ________

A

Stability

64
Q

3 components of GP- Other provides _____, _____, and ______

A

RadioOpaquer, Coloring, and Binders

65
Q

HEY THIS WOULD HAVE HELPED TO PAY ATTENTION TO: Fit the GP cone __-__mm short of the WL on LARGE STRAIGHT canals and ___mm short in CURVED canals

A

1-1.5 short in large straight canals….0.5 in curved canals

66
Q

NEVER force a ______ against a canal wall when condensing

A

pluggers

67
Q

What are the 4 types of Sealer? Which type do we use at ASDOH?

A

1) Zinc Oxide-Eugenol *Roths 801=OUR Clinic 2)Resin 3)Calcium Hydroxide 4) Silicone

68
Q

What is the main POWDER component to the Roths 801 sealer? What is the main Liquid component?

A

power-Zinc oxide, liquid-eugenol

69
Q

Warm Vertical Condensation ADV: excellent apical ____, excellent ____ fill, well ____ technique, easily ________

A

seal, 3-d fill, studied, retreated

70
Q

Warm Vertical Condensation DISadv: Difficult to _____, frequent ____-extension, prone to ______ while condensing

A

MASTER….over-extension, FRACTURE root

71
Q

Ideal obturation: within __mm of the apex and not overextended, NO GP/Sealer ABOVE the ____

A

1mm…CEJ

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