Endo quiz 3

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Questions and Answers

Which material has similar bioactive properties to MTA and is used as a root canal sealer?

Guttacore®

BC Sealer™ (correct)

Brasseler

MTA (mineral trioxide aggregate)

What is the main purpose of obturation in root canal treatment?

To fill the root canal system (correct)

To prepare and disinfect the root canal

To choose the appropriate technique for filling the canal

To assess the quality of the fill

Which type of sealer is absorbable when in contact with tissues and tissue fluids?

Resin-based sealers

BC Sealer™

Guttacore®

Zinc oxide eugenol-based sealers (correct)

What is the appropriate amount of sealer that should be deposited into the canal system?

An appropriate amount of sealer Signup and view all the answers

Which of the following is the ultimate goal of endodontic treatment?

To retain teeth in function with pulpal or periapical pathosis Signup and view all the answers

Which one of these instruments has direct clinical evidence supporting its effectiveness?

None of these instruments have direct clinical evidence Signup and view all the answers

What are the two pillars of nonsurgical endodontics?

Canal preparation and obturation Signup and view all the answers

What can a missed canal during canal preparation be associated with?

Endodontic failures Signup and view all the answers

What is the typical recommendation for moving a rotary instrument into the canal?

Move the instrument in an in-and-out motion Signup and view all the answers

When should case referral to an endodontist for microscope-supported treatment be considered?

When there are two canals in the mesiobuccal root Signup and view all the answers

What is the relationship between the taper and diameter of a file and its susceptibility to fatigue failure?

Greater taper and larger diameter increase susceptibility to fatigue failure Signup and view all the answers

What is the recommended way to reduce failure when using rotaries?

Apply very light pressure while advancing the instrument Signup and view all the answers

Which of the following is a concern about reusing NiTi instruments?

All of the above Signup and view all the answers

What is the term used to describe smaller-than-usual apical sizes in endodontics?

Minimally invasive endodontics Signup and view all the answers

Which of the following is recommended before using rotary instruments in endodontics?

Using a small K-file (size #10) Signup and view all the answers

What is the ideal goal of root canal obturation?

To provide a definitive coronal, lateral, and apical seal Signup and view all the answers

Which of the following is NOT a benefit of using nickel-titanium (NiTi) instruments in endodontics?

High resistance to corrosion Signup and view all the answers

Which of the following statements about controlled-memory (CM) nickel-titanium (NiTi) rotaries is true?

CM files are less prone to deformation and instrument fracture Signup and view all the answers

Which of the following strategies is NOT recommended for canal preparation in canals with wide oval or ribbon-shaped cross-sections?

Oscillating instruments Signup and view all the answers

What is the maximum number of bending cycles that nickel-titanium (NiTi) can endure without experiencing brittle fracture?

1,000 cycles Signup and view all the answers

Which of the following is NOT a requirement for the gutta-percha mass in each canal during compaction?

Extend to the apical 5 mm Signup and view all the answers

What materials are suitable for an orifice barrier to protect root canals from leakage?

All of the above Signup and view all the answers

What is the recommended working length to prevent overextension of root filling material into the periapical tissue?

Slightly short of the tip of the root Signup and view all the answers

Which of the following is NOT an undesirable outcome of root canal treatment?

Complete obturation of the root canal system Signup and view all the answers

Which of the following factors has the greatest impact on the outcomes of root canal treatment?

The presence of bacterial infection Signup and view all the answers

What is the potential harm of overfills during root canal treatment?

Permanent damage to the patient Signup and view all the answers

Which material is typically used in combination with cement for filling root canals?

Gutta-percha Signup and view all the answers

What is the role of the obturation material used in root canal treatment outcomes?

It has no impact on outcomes Signup and view all the answers

Which of the following can cone-beam computed tomography study determine?

The prevalence of apical periodontitis in endodontically treated premolars and molars Signup and view all the answers

Which of the following is not associated with persistent presence of bacterial infection?

Overfills Signup and view all the answers

Study Notes

Bioactive Materials and Sealers

Biodentine is a material that shares similar bioactive properties with MTA and functions effectively as a root canal sealer.
The main purpose of obturation in root canal treatment is to seal the root canal space, preventing reinfection and ensuring the stability of the treated tooth.

Sealer Properties

Absorbable sealers are ones that dissolve when in contact with tissues and tissue fluids, facilitating bioactivity.
The appropriate amount of sealer deposited into the canal system should create an adequate seal without overfilling.

Endodontic Treatment Goals

The ultimate goal of endodontic treatment is to preserve the tooth and maintain a healthy periapical environment.
Instruments with clinical evidence supporting their effectiveness must be used for reliable outcomes in endodontics.

Endodontic Techniques

The two pillars of nonsurgical endodontics are thorough cleaning and shaping of the canal, along with effective obturation.
Missed canals during preparation can lead to treatment failures and persistent infection.

Rotary Instrument Use

The typical recommendation for moving rotary instruments into the canal involves a gentle and cyclic motion to maintain canal integrity.
Referral to an endodontist for microscope-supported treatment should be considered when complex cases or anatomical challenges arise.

Instrument Design and Failure

A relationship exists where a larger taper combined with a smaller diameter file increases susceptibility to fatigue failure.
To reduce failure rates when using rotary instruments, employ a systematic approach including assessment of canal anatomy and proper instrument selection.

NiTi Instrument Considerations

Concerns regarding the reuse of NiTi instruments include potential for deformation and reduced effectiveness after several uses.
Smaller-than-usual apical sizes in endodontics are described as "microcanals," which may require specialized techniques and instruments.

Preparation Guidelines

Before using rotary instruments, appropriate canal visualization and straight-line access should be established.
The ideal goal of root canal obturation is to completely fill the canal space while maintaining apical seal and avoiding overfilling.

Nickel-Titanium (NiTi) Instruments

Benefits of NiTi instruments include flexibility and the ability to navigate curved canals; however, they also present certain risks and challenges.
Controlled-memory NiTi rotaries exhibit unique mechanical properties that enable them to maintain their shape more efficiently.

Canal Preparation Strategies

Strategies not recommended for preparation in wide oval or ribbon-shaped canals include using overly large instruments that might not follow the canal path accurately.
NiTi instruments can endure a maximum of 10,000 bending cycles before risk of brittle fracture occurs.

Gutta-Percha and Orifice Barriers

Gutta-percha mass in each canal should achieve a proper seal without voids but does not specifically need to be homogeneous in size during compaction.
Suitable materials for orifice barriers to protect root canals from leakage may include resilon or dental adhesives.

Working Length and Treatment Outcomes

The recommended working length in root canal filling is crucial to prevent overextension into periapical tissues, maintaining a healthy tissue reaction.
The greatest impact on root canal treatment outcomes is determined by thorough disinfection and effective sealing techniques.

Risks of Overfilling

Overfilling can potentially harm surrounding tissue, leading to inflammatory responses and treatment complications.
Common materials used in combination with cement for filling root canals include sealing compounds and bioactive glass.

Imaging and Infection Presence

Cone-beam computed tomography (CBCT) studies can determine the presence of anatomical variations and assist in planning treatment.
Persistent bacterial infections are often associated with factors like inadequate cleaning rather than specific treatment modalities.

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Description

Test your knowledge on the use of tapered guttapercha cones and pluggers for effective compaction of gutta-percha in root canals. Assess your understanding of fitting the master cone, different types of pluggers, and achieving a precise fit near the apical constriction.