Lecture 13 (11/21 maybe)

Question 1

EDTA has a concentration of:

Answer 1

17%

Question 2

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

Answer 2

false

Question 3

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

Answer 3

True

Question 4

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

Answer 4

C- removes the smear layer

Question 5

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

Answer 5

30 minutes

Question 6

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

Answer 6

bacteria and their substrate

Question 7

Instrumentation allows for access of the complex anatomy by ____%

Answer 7

60-70%

Question 8

What is NaOCl comprised of?

Answer 8

8.3% Sodium hypochlorite (bleach)

Question 9

Our major weapons: cleaning and shaping with:

Answer 9

NaOCl & Intra-canal medicaments

Question 10

You must not have the tip of the syringe:

Answer 10

beyond apical constriction

Question 11

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

Answer 11

2 mm short of WL

Question 12

When NaOCl breaks down, what do we have?

Answer 12

NaCl & H2O

Question 13

NaOCl becomes inactive after:

Answer 13

3-5 minutes in the canal

Question 14

NaOCl becomes in active after 3-5 minutes in the canal so it must be:

Answer 14

replinished every 3-5 minutes

Question 15

It is important that you irrigate with NaOCl following:

Answer 15

each active instrument

Question 16

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

Answer 16

Dakin’s Solution; 0.25% NaOCl

Question 17

Compared to Dakin’s Solution, 8.3% NaOCl (Clorox) is ____ times stronger and more _____ but also more ____

Answer 17

33.2x stronger; toxic; effective

Question 18

A typical class requires about _____cc of NaOCl as irritant per visit

Answer 18

10-12cc

Question 19

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

Answer 19

30 minutes; #30

Question 20

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

Answer 20

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

Question 21

What does Recapitulate mean?

Answer 21

1. Flood canal system with NaOCl
2. Repeat every 3-5 min
3. Move on with next active instrument

Question 22

Sodium hypochlorite:

1. Strong ____
2. Powerful ____
3. Dissolves necrotic tissue at ____ concentration
4. Dissolves living tissue at ____ concentration

Answer 22

1. oxidizer
2. disinfectant
3. low concentration
4. high concentration

Question 23

What is the med of choice in endodontics?

Answer 23

sodium hypochlorite

Question 24

Vigorous injection will cause irritant to:

Answer 24

express apically

Question 25

To avoid NaOCl incident; 1. DO NOT: 2. Keep : 3. Dental dam:

Answer 25

1. let tip bind 2. tip moving & loose in canal 3. must NOT leak

Question 26

What results from NaOCl incident (NaOCl forced out of the end of the tooth into the P/A tissues)

Answer 26

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

Question 27

This devices agitates irrigation solutions during endo treatment.

Answer 27

Endo activator

Question 28

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

Answer 28

true

Question 29

List the sizes of the following endo activator tips: A) small B) medium C) large

Answer 29

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

Question 30

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

Answer 30

false

Question 31

Produced when we do any mechanical shaping n dentin. It lies on the surface of the dentinal tubules

Answer 31

smear layer

Question 32

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

Answer 32

smear layer

Question 33

When must the smear layer be removed?

Answer 33

BEFORE obturation

Question 34

What is introduced into the canal system and allowed to work for 60 seconds followed by the 8.3% NaOCl?

Answer 34

17% EDTA