39 Questions
What is the primary nature of the smear layer created by instrumentation?
Inorganic
Which of the following is NOT a current method of smear layer removal?
Laser
What is the effect of the smear layer on the quality of root canal treatment?
It may prevent the penetration of intracanal medicaments and sealers into the dentinal tubules
What are the components of the smear layer created by instrumentation?
Calcific, organic, bacterial, and necrotic tissue
Which technique is commonly used for smear layer removal?
Ultrasonics
What may interfere with the close adaptation of root filling materials to canal walls?
Smear layer
How can the smear layer be removed from root canal walls?
Chemicals and sonics
What can the thick smear layer created by instrumentation prevent?
The penetration of intracanal medicaments and sealers into the dentinal tubules
Which method is recommended to remove the inorganic (calcium salts) from the smear layer?
EDTA
What is the primary purpose of sodium hypochlorite in root canal treatment?
To remove organic constituents of the smear layer
In what type of canal preparation is lateral condensation of cold gutta-percha not the technique of choice?
Canals with a continuous taper matching the spreader/ plugger
What is the main purpose of establishing a higher quality apical seal in root canal treatment?
To prevent bacterial leakage and reinfection
What is the recommended size for a spreader to be used in most cases regardless of the master cone size?
#25
What are the standardized sizes and shapes of gutta-percha points meant to match?
Sizes and shapes of the spreaders/pluggers
Which test is used to determine if the primary gutta-percha point is visually suitable for a root canal?
Visual test
What is the purpose of using sealer in root canal treatment?
To facilitate the condensation of gutta-percha
Which method can be used for placing the master point (master GP cone) with the sealer?
Coating it with sealer and slowly moving it to full working length
What is the purpose of using a spreader in root canal obturation?
To apply a lateral force for condensation
What is the risk of using excessive compaction forces during lateral compaction?
Fracturing of the gutta-percha
What is the purpose of using an accessory cone in root canal obturation?
To seal the foramen with gutta-percha
What is the significance of searing protruding points at the orifice of the canal?
To create a coronal seal
Why is it important for the obturation mass to have no voids during root canal obturation?
To ensure proper adaptation to the canal walls
What is the potential consequence of inadequate condensation during root canal obturation?
Vertical root fracture
What is the purpose of using a scalpel blade on a glass slab when cutting the cone?
To create a smooth GP surface
What is 'tugback' in reference to root canal treatment?
The resistance upon removal of gutta-percha from the canal
What is the purpose of the 'radiograph test' in root canal treatment?
To confirm the visual and tactile tests for the trial point
What should be done if the radiograph shows that the gutta-percha point was forced beyond the apex?
Shorten the gutta-percha point from the fine end and return it to proper position
What is the purpose of placing an absorbent paper point in the canal while preparations are being made to cement the filling point?
To absorb excess moisture or blood that might accumulate
What is considered an ideal consistency for root canal cement when mixing it?
A thick, creamy consistency that can be held for 10 seconds on an inverted spatula
What might cause a sensation of much greater intensity than periapical tissue during root canal treatment?
Pulp remnants from a short preparation
What should be done if an initial gutta-percha point does not go completely into place?
Re-instrument the canal with a new file of the same number until it's loose in the canal, or select a smaller size gutta-percha point
What is the primary purpose of making an obturation verification radiograph?
To assess the length of the obturation
In which teeth should the gutta-percha be removed 1mm apical to the gingival margin?
Maxillary right central incisor
What is an example of an adequate feature reflecting proper shaping in obturation?
Level of GP removal
Why is it important to have a properly placed coronal restoration in obturation?
To provide a good coronal seal
What is a disadvantage of not having a proper coronal seal?
Risk of voids and unfilled canal space
What is an advantage of making an obturation verification radiograph before searing off excess GP?
Allows for complete removal of gutta-percha by grasping the cones
In which teeth should the gutta-percha be removed 1mm apical to the canal orifice?
Maxillary left central incisor
What does the presence of excess sealer puff above a tooth indicate in an obturation verification radiograph?
Inadequate removal of gutta-percha
Test your knowledge of endodontic procedure techniques such as cutting gutta-percha cones and ensuring smooth surfaces. This quiz covers the proper methods for adapting gutta-percha cones to canal walls.
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