Root Canal Obturation Quiz and Flashcards for Endodontics

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Questions and Answers

What is the main cause of pulpal and periapical disease?

Fungi

Foreign objects

Virus

Bacteria (correct)

Which factor affects the outcome of primary root canal treatment related to obturation?

Presence of preoperative radiolucent lesion

Filling beyond 2 mm of the radiographic apex

Absence of preoperative radiolucent lesion (correct)

Low density filling with voids

Why is it necessary to obturate the radicular space?

Promote apical leakage

Entomb the remaining irritants in the canal (correct)

Fill the canal with bacteria

Allow traffic of fluids from periradicular tissues

What is the main aim of obturation?

Prevent leakage and reinfection of the cleaned and disinfected root canal system Signup and view all the answers

Which statement justifies the necessity of obturating the root canal?

Studies indicate that root canal systems cannot be completely cleaned and disinfected Signup and view all the answers

What does obturation serve to prevent in the root canal system?

Leakage and reinfection Signup and view all the answers

What consequence does obturation aim to reduce?

Apical leakage Signup and view all the answers

Which factor contributes to the need for obturation?

Sealing the apex from periapical tissue fluids Signup and view all the answers

What does obturation prevent from flowing into the canal?

Bacteria and their products from the canal to periradicular tissues Signup and view all the answers

What is a primary objective of obturation?

Seal the apex from periapical tissue fluids (prevents apical leakage) Signup and view all the answers

What does obturation achieve with adequate coronal restoration?

Reduces coronal leakage (prevents coronal leakage) Signup and view all the answers

What is the major disadvantage of using silver cones as a core material for obturation?

They corrode when in contact with tissue fluids, producing cytotoxic products Signup and view all the answers

What are the properties of an ideal obturation material as outlined by Grossman?

Radiopacity, ease of manipulation, and minimal toxicity Signup and view all the answers

What is the main reason for the contraindication of sealers containing paraformaldehyde in endodontic treatment?

They are not approved by the U.S. Food and Drug Administration Signup and view all the answers

What is the composition of gutta-percha cones approximately?

20% gutta-percha, 65% zinc oxide, 10% radiopacifiers, 5% plasticizers Signup and view all the answers

What is the purpose of adding dyes to gutta-percha cones?

To simulate the color of the pulp Signup and view all the answers

What is the major disadvantage of using gutta-percha as a core material for obturation?

It lacks adhesion to dentin Signup and view all the answers

Which phase of gutta-percha is compactable and solid before heating?

Beta phase Signup and view all the answers

How are nonstandard gutta-percha cones classified?

By their taper size Signup and view all the answers

What is the purpose of modifying gutta-percha with heat or solvents?

To permit adaptation to irregularities of canal walls Signup and view all the answers

Why are gutta-percha points not heat sterilized?

They lose their plasticity when heat sterilized Signup and view all the answers

When is the root canal considered ready to be filled?

When the canal is cleaned and shaped to an optimum size Signup and view all the answers

What marks the end of the root canal?

The cementodentinal junction apically Signup and view all the answers

Which of the following is NOT a function of root canal sealers?

Enhancing the adhesion of gutta-percha points to dentin Signup and view all the answers

Which type of sealer has a history of successful use over an extended period of time and is known for its antimicrobial activity?

Zinc oxide–eugenol sealers Signup and view all the answers

What is a disadvantage associated with glass ionomer sealers?

Difficulty in removal during retreatment Signup and view all the answers

Which resin sealer was found to release formaldehyde when setting, leading to concerns about its safety?

AH-26 Signup and view all the answers

What desirable property was associated with the bondable root canal sealers initially marketed?

Creation of monoblocks within the root canal space Signup and view all the answers

Which material is reported to expand slightly on setting and is commonly used in root canal obturation?

GuttaFlow2 Signup and view all the answers

Which type of sealers exhibits bioactivity and sets in the presence of moisture?

Calcium silicate–based sealers Signup and view all the answers

What property is important for tricalcium silicate cements/sealers in terms of creating a barrier during obturation?

Dimensional change less than 0.1% expansion on setting Signup and view all the answers

Which sealer has been marketed for its dentin-bonding properties but poses a challenge in terms of removal during retreatment?

Glass ionomer sealer Signup and view all the answers

Which type of sealer provides adhesion, does not contain eugenol, and has been categorized into epoxy resin–based and methacrylate resin–based?

Resin sealer Signup and view all the answers

What is a common feature among all types of root canal sealers?

Biocompatibility and well tolerated by periradicular tissues Signup and view all the answers

Which material provides a working time of approximately 4 hours and achieves high bond strength to both dentin and gutta-percha?

AH Plus sealer Signup and view all the answers

Study Notes

Pulpal and Periapical Disease

Bacterial infection is the main cause of pulpal and periapical disease.

Primary Root Canal Treatment

The factor that affects the outcome of primary root canal treatment is Obturation.

Importance of Obturation

Obturation is necessary to fill the radicular space.
The main aim of obturation is to prevent bacterial growth and infection.
Obturation serves to prevent microorganisms and toxins from flowing into the canal.
Obturation aims to reduce the risk of periapical disease.

Necessity of Obturation

The necessity of obturation is justified by the need to prevent bacteria and toxins from entering the canal.
Obturation is necessary to prevent re-infection of the root canal system.

Primary Objective of Obturation

The primary objective of obturation is to create a three-dimensional seal of the root canal system.

Properties of Ideal Obturation Material

The ideal obturation material should be biocompatible, non-toxic, and non-carcinogenic.
The ideal obturation material should be radiopaque and have a low solubility in tissue fluids.
The ideal obturation material should be easy to manipulate and have a long shelf life.

Contraindication of Sealers

Sealers containing paraformaldehyde are contraindicated in endodontic treatment due to their toxicity.

Composition of Gutta-Percha Cones

Gutta-percha cones are approximately 20% gutta-percha, 75% zinc oxide, and 5% other additives.

Purpose of Adding Dyes

Dyes are added to gutta-percha cones to aid in visibility during treatment.

Properties of Gutta-Percha

Gutta-percha is a α-phase when compacted and solid before heating.
Non-standard gutta-percha cones are classified as β-phase.

Purpose of Modifying Gutta-Percha

Gutta-percha is modified with heat or solvents to make it more compactable.

Heat Sterilization of Gutta-Percha

Gutta-percha points are not heat-sterilized to prevent deformation.

Readiness for Filling

The root canal is considered ready to be filled when it is clean and shaped.

End of Root Canal

The radiographic appearance of the root canal marks its end.

Functions of Root Canal Sealers

Root canal sealers do not have the function of an anesthetic.

Glass Ionomer Sealers

A disadvantage of glass ionomer sealers is their low strength.

Resin Sealer

One resin sealer releases formaldehyde when setting, leading to concerns about its safety.

Bondable Root Canal Sealers

Bondable root canal sealers were initially marketed for their ability to bond to dentin.

Material Expansion

Material reported to expand slightly on setting and is commonly used in root canal obturation is MTA.

Bioactive Sealers

Tricalcium silicate cements/sealers exhibit bioactivity and set in the presence of moisture.

Importance of Barrier Creation

The property of creating a barrier during obturation is important for tricalcium silicate cements/sealers.

Challenges in Retreatments

The sealer that poses a challenge in terms of removal during retreatment is the bondable root canal sealer.

Adhesive Sealers

The type of sealer that provides adhesion, does not contain eugenol, and has been categorized into epoxy resin–based and methacrylate resin–based is the adhesive sealer.

Common Feature among Sealers

A common feature among all types of root canal sealers is their ability to seal the root canal system.

Material with Long Working Time

The material that provides a working time of approximately 4 hours and achieves high bond strength to both dentin and gutta-percha is MTA.

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Description

Test your knowledge on the factors affecting the outcome of primary root canal treatment and the importance of obturating the root canal system. This quiz is based on the lecture by Mahmoud Ramadan Abo ElSeoud, a lecturer of Endodontics at Alexandria University.

Root Canal Obturation in Endodontics

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