Lecture 13 (11/21 maybe) Flashcards
EDTA has a concentration of:
17%
T/F: With careful planning and execution it is possible to instrument all pulpal spaces
false
T/F: The primary method of irrigation with NaOCl to avoid incident is to never allow the syringe tip to bind in the canal:
True
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
C- removes the smear layer
What is the minimum time for NaOCl to function in the prepared canal to be effective?
30 minutes
We must remove and destroy both ____ & ____ to be successful
bacteria and their substrate
Instrumentation allows for access of the complex anatomy by ____%
60-70%
What is NaOCl comprised of?
8.3% Sodium hypochlorite (bleach)
Our major weapons: cleaning and shaping with:
NaOCl & Intra-canal medicaments
You must not have the tip of the syringe:
beyond apical constriction
Where should you set the bend of the tip of the syringe?
2 mm short of WL
When NaOCl breaks down, what do we have?
NaCl & H2O
NaOCl becomes inactive after:
3-5 minutes in the canal
NaOCl becomes in active after 3-5 minutes in the canal so it must be:
replinished every 3-5 minutes
It is important that you irrigate with NaOCl following:
each active instrument
What is often used for surface disinfection? What is it comprised of?
Dakin’s Solution; 0.25% NaOCl
Compared to Dakin’s Solution, 8.3% NaOCl (Clorox) is ____ times stronger and more _____ but also more ____
33.2x stronger; toxic; effective
A typical class requires about _____cc of NaOCl as irritant per visit
10-12cc
NaOCl must be in contact with shaped canal a minimum of ____ after canal is enlarged to ___ or larger
30 minutes; #30
A canal smaller than #30 will seldom if ever allow:
any irritant to reach the apical 1/3 of the canal
What does Recapitulate mean?
- Flood canal system with NaOCl
- Repeat every 3-5 min
- Move on with next active instrument
Sodium hypochlorite:
- Strong ____
- Powerful ____
- Dissolves necrotic tissue at ____ concentration
- Dissolves living tissue at ____ concentration
- oxidizer
- disinfectant
- low concentration
- high concentration
What is the med of choice in endodontics?
sodium hypochlorite
Vigorous injection will cause irritant to:
express apically
To avoid NaOCl incident;
- DO NOT:
- Keep :
- Dental dam:
- let tip bind
- tip moving & loose in canal
- must NOT leak
What results from NaOCl incident (NaOCl forced out of the end of the tooth into the P/A tissues)
- immediate & extreme pain for several days
- ecchymosis
- swelling
- temporary disfigurement
- court appearance
This devices agitates irrigation solutions during endo treatment.
Endo activator
T/F: Evidence-based endodontics has shown that cavitation and acoustic streaming significantly improve debridement and the disruption of the smear layer and biofilm:
true
List the sizes of the following endo activator tips:
A) small
B) medium
C) large
A) 15/02
B) 25/04
C) 35/04
T/F: Using an endo activator diminishes the time needed for irrigation
false
Produced when we do any mechanical shaping n dentin. It lies on the surface of the dentinal tubules
smear layer
Occludes access to the dentinal tubules so MUST be removed to complete the cleaning procedure before obturation or when using various sealers and cement
smear layer
When must the smear layer be removed?
BEFORE obturation
What is introduced into the canal system and allowed to work for 60 seconds followed by the 8.3% NaOCl?
17% EDTA
