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Endodontics > Lecture 12 > Flashcards

Lecture 12 Flashcards

1
Q

EDTA has a concentration of:

A

17%

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2
Q

T/F: with careful planning and execution it is possible to instrument all pulpal spaces:

A

False

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3
Q

T/F: the primary method of irrigation with NaOCl to avoid incident is to never allow the syringe tip to bind in the canal

A

True

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4
Q

Which of the following functions is NOT accomplished by NaOCl?

a) disorganizes biofilm
b) dilutes toxins in the canal system
c) removes the smear layer
d) dissolves tissue substrate within the canals
e) lubricates the canal system

A

c) removes the smear layer

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5
Q

What is the minimum time for NaOCl to function in the prepared canal to be effective?

A

30 minutes

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6
Q

We must remove and destroy both _____ & ____ to be successful

A

Bacteria & their substrate

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7
Q

Instrumentations allows for access of a complex anatomy by ______%

A

60-70%

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8
Q

What is NaOCl comprised of?

A

8.3% sodium hypochlorite (bleach)

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9
Q

Our major weapons: cleaning and shaping with

A

NaOCl & intra-canal medicaments

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10
Q

You MUST NOT have the tip of the syringe:

A

beyond apical constriction

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11
Q

Where should you set the bend of the tip of the syringe?

A

2 mm short of WL

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12
Q

When NaOCl breaks down, what do we have?

A

NaCl & H2O

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13
Q

NaOCl becomes inactive after:

A

3-5 min in the canal

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14
Q

NaOCl becomes inactive after 3-5 min in the canal so it must be:

A

replenished every 3-5 min

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15
Q

It is important that you irrigate with NaOCl following:

A

each active instrumentation

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16
Q

What is often used for surface disinfection? What is it comprised of?

A

Dakin’s solution; o.25% NaOCl

17
Q

Compared to Dakins solution 8.3% NaOCl (Clorox) is ____ times stronger and more _____ also more _____

A

33.2x stronger; toxic; effective

18
Q

A typical case requires about ______ cc of NaOCl as irrigant per visit

A

10-12 cc

19
Q

NaOCl must be in contact with the shaped canal a minimum of ____ after the canal is enlarged to _____ or larger

A

30 min; #30

20
Q

A canal smaller than #30 will seldom if ever allow:

A

any irrigant to reach the apical 1/3 of the canal

21
Q

What does recapitulation mean?

A
  1. flood canal system with NaOCl
  2. repeat every 3-5 min
  3. move on with next active instrument
22
Q

Sodium hypochlorite:

  1. is a strong _____
  2. powerful _____
  3. dissolves necrotic tissue at _____ concentrations
  4. dissolves living tissue at _____ concentration
A
  1. oxidizer
  2. disinfectant
  3. low concentration
  4. high concentration
23
Q

What is the med of choice in endodontics?

A

Sodium hypochlorite (NaOCl)

24
Q

Vigorous injection will cause irrigant to:

A

express apically

25
Q

To avoid NaOCl incidents:

  1. Do NOT:
  2. Keep:
  3. Dental dam:
A
  1. let tip bind
  2. tip moving & loose in the canal
  3. must NOT leak
26
Q

What results with NaOCl incidents? (NaOCl forced out the end of the tooth into the P/A tissues)

A
  1. immediate & extreme pain for several days
  2. ecchymosis
  3. swelling
  4. temporary disfigurement
  5. court appearance
27
Q

This device agitates irrigation solutions during endodontic treatment:

A

endo activator

28
Q

T/F: Evidence-based endodontics show that cavitation and acoustic streaming significantly improve debridement and the disruption of the smear layer and biofilm

A

True

29
Q

List the sizes of the following endo activator tips:

A) Small
B) Medium
C) Large

A

A) 15/02
B) 25/04
C) 35/04

30
Q

T/F: Using an endo activator diminishes the time needed for irrigation

A

False

31
Q

Produced when we do any mechanical shaping in dentin; it lies on the surface of the dentinal tubules:

A

smear layer

32
Q

Occludes access to the dentinal tubules so MUST be removed to complete the cleaning procedure before obturation or when using various sealers and cements:

A

smear layer

33
Q

When must the smear layer be removed?

A

BEFORE obturation

34
Q

What is introduced into the canal system and allowed to work for 60 seconds?

A

17% EDTA

35
Q
A

Endodontics (17 decks)

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