Endodontics

A dental professional examining a root canal, with annotated diagrams of dental tools and materials in a clinical setting, emphasizing endodontic procedures.

Endodontics Mastery Quiz

Test your knowledge and proficiency in endodontics with our comprehensive quiz designed for dental professionals and students. This quiz challenges your understanding of key concepts, materials, and techniques used in root canal treatments.

Key Features:

  • 30 multiple-choice questions
  • Focus on practical applications and current methodologies
  • Perfect for exam preparation or self-assessment
60 Questions15 MinutesCreated by ExpertExplorer395
Which statement is true?
NaOCl can bind to dentin and remains antimicrobial
Chlorhexidine can bind to dentin and remains antimicrobial
EDTA can bind to dentin and remains antimicrobial
H2O2 can bind to dentin and remains antimicrobial
When chlorhexidine is mixed with EDTA, what will occur?
A brownish-orange precipitate containing parachloroaniline (PCA), which is toxic and mutagenic, is formed.
NaOCl will lose its tissue-dissolving capacity.
A white precipitate is formed, and the ability of EDTA to reduce the smear layer is reduced.
Nothing happens
When chlorhexidine is mixed with NaOCl, what will occur?
A brownish-orange precipitate containing parachloroaniline (PCA), which is toxic and mutagenic, is formed.
NaOCl will lose its tissue-dissolving capacity.
A white precipitate is formed, and the ability of EDTA to reduce the smear layer is reduced.
Nothing happens
Chlor-XTRA is a combination product of:
NaOCl + Detergent
H2O2+ Detergent
EDTA + Detergent
Chlorhexidine + Detergent
SmearClear is a combination product of:
NaOCl + Detergent
H2O2+ Detergent
EDTA + Detergent
Chlorhexidine + Detergent
CHX-Plus is a combination product of:
NaOCl + Detergent
H2O2+ Detergent
EDTA + Detergent
Chlorhexidine + Detergent
MTAD and Tetraclean are a mixture of:
Doxycycline, citric acid, and detergent
Amoxicillin, citric acid, and detergent
Tetracycline, citric acid, and detergent
Clindamycin, citric acid, and detergent
What is the intended use of MTAD?
As the initial rinse before the root canal preparation
As the main irrigant
As a final rinse to disinfect the root canal system and remove the smear layer
As a lubricant
What are the disadvantages of using irrigants containing doxycycline?
Cause dentin erosion
Toxicity
Antibiotic resistance and tooth staining
Weaken the tooth by making dentin more brittle
Which product contains a chlorhexidine-analog?
MTAD
SmearClear
Qmix
Chlor-XTRA
Iodine potassium iodide is usually used in which concentration?
1% to 2%
2% to 5%
5% to 10%
10% to 12%
Which irrigant may be most effective against E. faecali?
NaOCl
Iodine potassium iodide
SmearClear
EDTA
Which solution can be used as an alternative to EDTA?
H2O2
Saline water
Citric acid
Iodine potassium iodide
Which one is not one of the challenges in irrigation?
Smear layer
Biofilm
Cleaning of instrumented parts of the root canal-system
Safety versus effectiveness in the apical root canal.
Which syringe is recommended for irrigation?
1-5ml syringe
10 ml syringe
50 ml syringe
Any syringe is fine
The suggested follow-up periods for endodontic treatment range from:
6 months to 1 year
6 months to 2 years
6 months to 3 years
6 months to 4 years
In case of vital tooth, how should we determine the success of our treatment?
No periapical lesion develops after the 6-month follow-up and the tooth is symptom free.
No periapical lesion develops after at least 1 year of follow-up and the tooth is symptom free.
No periapical lesion develops after at least 1 year of follow-up, even though the tooth is tender to percussion.
Periapical lesion develops, but the tooth is symptom free.
Which method is not practical to evaluate the outcome of endodontic treatment?
Radiographic findings
Histologic examination
Clinical examination
Patient interview
Which of the following statements is not true?
Absence of any clinical signs and symptoms always confirm the success of endodontic treatment
Absence of any clinical signs and symptoms does not always confirm the success of endodontic treatment.
Presence of marked and persistent signs and symptoms probably indicates failure of endodontic treatment.
Absence of pain and swelling is one of the clinical criteria for success of endodontic treatment.
If the radiolucent lesion has neither become larger or significantly smaller in size after more than 1 year of follow-up, how should we evaluate the outcome of the treatment?
Failure
Success
Questionable status
Success if no clinical signs and symptoms
If at 6 months, the lesion is still present but smaller in size, the lesion:
Will remain unchanged
May heal but need more time
Will gradually increase in size
Will become smaller but will never heal completely
Which is the preoperative factor that would affect the treatment outcome:
Preoperative pain
Presence of apical lesion
Patient’s overall health
Age of the patient
Which one is not one of the factors that would affect the outcome of the endodontic treatment?
Quality of seal
Coronal leakage
Extent of canal preparation
Preoperative pain
Factors to consider whether to retreat or not include all of the following except one, which is:
Risks of untreated disease
Risks of untreated disease
Age of patient
Personal preferences
In case of endodontic failure and the patient has a strong motivation to retain the tooth and pursue best long-term outcome, what should the treatment of choice be?
Extraction and implant placement
Endodontic Surgery
Orthograde retreatment
Intentional replantation
Which of the following statements is not true about retreatment cases?
An extensive restoration may have to be sacrificed and remade.
Root filling and possibly restorative materials must be removed from the canals.
The healing rate is generally the same as that after initial treatment.
Patients may be more apprehensive than with the routine initial treatment; effective communication is required.
In case of retreatment, when should a crown be removed?
When marginal leakage or a cracked tooth is suspected or when future remake of the crown is planned.
When the crown interferes with the use of electronic apex locator
Always need to be removed as it is hard to access through crowns
Should never be removed, as the endodontic failure is not caused by the crown itself.
In case of retreatment, when should a crown be kept?
Should always be kept, as the crown itself is not the cause the endodontic failure.
When the crown is satisfactory in both function and esthetic.
Should never be kept, as it can lead to perforation by trying to access through the crowns.
Whenever we can make a good access through the crown.
The first step in removing the cast post and core should be:
Immediately extract the post and core with an instrument as appropriate.
Use ultrasonic devices on the post to break up the cement
Reduce the cast core first, leaving just the post extending from the canal.
Pointed tips are used to ultrasonically trough around the post.
Which instrument should be used to remove the coronal portion of GP in an attempt to retreat a failure case?
Hand files, particularly H-files
Gates-Glidden burs
Heated instrument
Ultrasonic devices
Which instrument should be used to remove the apical portion of GP in an attempt to retreat a failure case?
Hand files, particularly H-files
Gates-Glidden burs
Heated instrument
Ultrasonic devices
Which technique can we use to remove any residual sealer after GP removal in a retreatment case?
Crown-down technique
Wicking technique
Step-back technique
Balanced-force technique
Which solvent can be used to soften hard-setting cements in a retreatment case?
Chloroform
Tetrachloroethylene
Xylene
Halothane
In a retreatment case, the canal enlargement should be:
The same as its previous size
Somewhat beyond its previous size
Somewhat smaller than its previous size
Depend on each individual case
How can ledges be by bypassed?
With ultrasonic devices
With NiTi rotary instrument.
With a #10 K-file bent sharply at 1mm of the tip
With Gates-Glidden burs
When should a missed canal be suspected?
Whenever a root canal treatment fails
When the previous treatment fails even it looks apparently adequate
When the lesion is on the lateral aspect of the root.
When there is a perforation as this indicates that the previous clinician failed to locate the missed canal
The prognosis of retreatment to correct an endodontic failure is:
About 50%
About 75%
About 90%
About 95%
Which of the following statement is true?
A proper final restoration is not necessary as long as the endodontic treatment is performed perfectly well
Good obturation is enough to prevent coronal leakage.
No matter how good the endondontic treatment is, a proper restoration is a must.
A proper restoration alone is enough to prevent re-infection of the root canal system.
How does the dentin change structurally after endodontic treatment?
Becomes more brittle due to loss of its moisture content
Becomes less brittle due to loss of its moisture content.
Becomes more brittle due to the increase of its moisture content.
Becomes less brittle due to the increase of its moisture content.
Which is a more important factor as a cause of tooth fracture after endodontic treatment without a protective restoration?
Loss of tooth structure, particularly loss of marginal ridge
Cusp slope
Brittle dentin
Restorative material
An adequate restoration after an endodontic treatment should have all of the following properties except one which is:
The restoration should provide a coronal seal
The restoration should maximize cuspal flexure
The restoration should protect the remaining tooth structure
The restoration should satisfy function and esthetics
The ideal timing of final restoration upon completion of endodontic treatmemt is:
Immediately
One day after
Until the periapical lesion completely heals
After at least 3 months of follow-up
In which condition should a final permanent restoration most likely be delayed after completing endodontic treatment?
Slight overfill with root canal sealer
Underfilled obturation
Non-retrievable broken instrument which compromises the endodontic treatment of teeth with limited access to apical surgery
Teeth with large periapical lesions but where apical surgery may correct the problem in case of failure.
Which material should be used as a semi-permanent restoration in endodontic cases with guarded prognosis?
GIC
Amalgam
Cavit
ZOE cement
A semi-permanent restoration for anterior teeth with endodontic guarded prognosis and little tooth structure remained should be:
Temporary post crown
Composite filling
GIC filling
Post and core (cast or plastic) and temporary crown
Which statement is true about post placement?
Posts strengthen the root-treated teeth
Posts weakens the root-treated teeth
Post placement is always necessary after endodontic treatment.
Post placement is still required even though there is enough retention for the core material, as this will strengthen the root.
What should we do to unsupported cusps during as well as after endodontic treatment?
Leave them as they are
Reduce them to avoid fracture
Strengthen them with composite
Protect them with a copper band
When should we plan the definitive restoration?
After the endodontic treatment is completed
During the endodontic treatment
Before starting the endodontic treatment
Any time is fine
When can we directly restore the endo-treated teeth?
In cases where both marginal ridges are lost
In cases where only little tooth structure remained
In cases where the prognosis is guarded
In cases where the cost of the restoration recommended is not a concern for the patient.
What are the two materials commonly used as the direct restoration for root-treated teeth?
Amalgam and GIC
GIC and Composite
Composite and Amalgam
Resin-modified glass ionomer cement and Silicate cement
If amalgam is used to for cuspal coverage, what is the minimum thickness considered to be sufficient?
At least 1 to 2 mm
At least 2 to 3 mm
At least 3 to 4 mm
At least 4 to 5 mm
The main concern over composite filling as a final restoration of an endo-treated teeth is:
Its cost
Its handling property
Its technique sensitivity
Its questionable long-term bonding, particular to dentin
The final restoration of an anterior tooth with largely intact crown or moderately class 3 or 4, and without discoloration or with discoloration responding well to bleaching should be:
Veneer
Full crown
Direct amalgam filling
Direct composite filling
The final restoration of an anterior tooth with largely intact crown or moderately class 3 or 4, but with discoloration resistant to bleaching should be:
GIC filling
Composite filling
Veneer or full crown
Always a veneer
The final restoration of an anterior tooth with a large decay but with more than 1/2 of tooth structure remained plus ferrule effect, and with limited overbite and functional stresses should be:
Fiber post and core + full crown
Metal post and core + full crown
Adhesive core + full crown
Ceramic post and core + full crown
The final restoration of an anterior tooth with a large decay but with more than 1/2 of tooth structure remained plus ferrule effect, and with deep over bite and increased functional stresses should be:
Adhesive core + full crown
Ceramic post and core + full crown
Amalgam core + full crown
GIC build-up + full crown
The final restoration of an anterior tooth with a large decay and with less than 1/2 of tooth structure remained with or without limited ferrule effect should be:
Amalgam core with or without post + full crown
Metal post and core + full crown
Adhesive core + full crown
Ceramic post and core + full crown
What is not an advantage of plastic material build-ups (particularly composite) with post over the use of cast post and core?
Saves chairside time
Saving tooth structure
Stronger than cast post and core
Saves cost
What is the method to strengthen a thin-walled root?
Using composite to fill all the space in the root.
Taking impression to fabricate a cast post and core to get a good fit with the actual root space.
Using composite but curing with light transmission post to leave a space for a final post, which will be cemented in place.
Fill the composite apical half of the space, and for the coronal half using cast post and core.
In molars, post is:
Always necessary to hold the core
Frequently necessary to hold the core
Sometimes necessary to hold the core
Rarely necessary to hold the core
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