Endodontics Quiz
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Questions and Answers

Which of the following is NOT a phase of endodontic therapy?

  • Obturation phase
  • Diagnostic phase
  • Preparatory phase
  • Extraction phase (correct)

Endodontic therapy can be performed on teeth without pulpal or periapical pathosis.

True (A)

What is the primary objective of endodontics?

To prevent, diagnose, and treat pulp and periradicular diseases.

The process of filling the root canal system with an inert material is called __________.

<p>obturation</p> Signup and view all the answers

Match the treatment indications with their descriptions:

<p>Traumatic pulp exposure = Accidental injury causing pulp exposure Teeth retained for overdenture = Supporting structures for removable dentures Internal resorption = Destruction of dental pulp from within Overerupted teeth = Teeth extending too far due to lack of opposing forces</p> Signup and view all the answers

Which condition is a contraindication for endodontic therapy?

<p>Teeth with vertical root fracture (B)</p> Signup and view all the answers

The preparatory phase involves the removal of the contents in the pulp chamber.

<p>True (A)</p> Signup and view all the answers

List one common indication for performing endodontic therapy.

<p>Pulpal or periradicular pathosis.</p> Signup and view all the answers

What is the average length of a maxillary canine tooth?

<p>26 mm (A)</p> Signup and view all the answers

The mandibular incisors have three pointed pulp horns.

<p>True (A)</p> Signup and view all the answers

What is the root canal configuration of the mandibular incisors most commonly observed?

<p>Class I root canal system</p> Signup and view all the answers

The outline form of the access cavity for maxillary canine is ________ in shape.

<p>triangular</p> Signup and view all the answers

Which of the following statements about the root canal configuration of the mandibular incisors is true?

<p>60% are Class I, 30% are Class III, and 10% are Class II. (A)</p> Signup and view all the answers

What is the shape of the cervical cross-section of the maxillary canine?

<p>triangular</p> Signup and view all the answers

The average length of mandibular incisors is ________ mm.

<p>21.5</p> Signup and view all the answers

Match the following tooth types with their specific characteristics:

<p>Maxillary canine = Triangular access cavity Mandibular incisor = Three pointed pulp horns Root canal configuration = Class I most common Pulp chamber shape = Oval in cervical section</p> Signup and view all the answers

What is the average length of the palatal root for maxillary molars?

<p>20.5 mm (D)</p> Signup and view all the answers

The mesial root of the mandibular first molar contains only one canal.

<p>False (B)</p> Signup and view all the answers

What shape is the outline form of the access cavity when there are four root canals?

<p>trapezoidal</p> Signup and view all the answers

The distal root of the mandibular first molar usually contains a single canal, while about ___% has an extra canal.

<p>30</p> Signup and view all the answers

Match the following root canals with their respective roots in the maxillary second molar:

<p>Mesiobuccal = MB1, MB2 Distobuccal = Class I Palatal = Class I Buccal root = Two canals (Class II or III)</p> Signup and view all the answers

Which root canal configuration is most common for mesial roots in maxillary molars?

<p>Two canals, Class II or III (D)</p> Signup and view all the answers

Both mesial and distal roots of the mandibular first molar generally curve distally.

<p>False (B)</p> Signup and view all the answers

What is the average length of the mesial root in the mandibular second molar?

<p>21 mm</p> Signup and view all the answers

What is the average length of the mandibular first premolar?

<p>21 mm (B)</p> Signup and view all the answers

The maxillary first molar has two roots.

<p>False (B)</p> Signup and view all the answers

What is the primary root canal configuration found in mandibular second premolars?

<p>single root canal (class I)</p> Signup and view all the answers

The outline form of the access cavity for the mandibular first premolar is ______ in bucco-lingual direction.

<p>ovoid</p> Signup and view all the answers

Match the following dental features with their corresponding tooth:

<p>Mandibular first premolar = 14-degree distal-axial inclination of the root Mandibular second premolar = 34-degree buccal-axial angulation of the root Maxillary first molar = Second mesiobuccal canal present 96% of the time</p> Signup and view all the answers

Which statement is true regarding the maxillary first molar's roots?

<p>The mesiobuccal root often contains an additional canal. (A)</p> Signup and view all the answers

A cross-section of the maxillary first molar at the cervical level can be trapezoidal.

<p>True (A)</p> Signup and view all the answers

The average length of the mandibular second premolar is ______ mm.

<p>21.5</p> Signup and view all the answers

What is the primary location for initial penetration when preparing the access cavity in mandibular molars?

<p>Central pit (C)</p> Signup and view all the answers

Perforation of a palatal root is commonly caused by assuming the canal to be curved.

<p>False (B)</p> Signup and view all the answers

What is the consequence of inadequate vertical preparation in molar access cavity preparation?

<p>Failure to recognize severe buccal inclination of an unopposed molar</p> Signup and view all the answers

The outline form for a three-orifice cavity in mandibular molars is _____ with the base mesially and apex distally.

<p>triangular</p> Signup and view all the answers

Match the following errors with their descriptions related to access cavity preparation:

<p>Overextended preparation = Undermining enamel walls Perforation into furcation = Narrow pulp chamber passed Missed second distal canal = Failure to recognize additional canal Ledge formation = Failure to provide straight line access</p> Signup and view all the answers

What is the primary benefit of straight line access (SLA) in endodontic procedures?

<p>Unobstructed access to the canal orifices (D)</p> Signup and view all the answers

For improved access to the apical foramen, more tooth structure should be preserved.

<p>False (B)</p> Signup and view all the answers

What must be removed during endodontic cavity preparation to ensure optimal conditions?

<p>carious dentin and defective restorations</p> Signup and view all the answers

The softened gutta-percha technique may require the outline form to be widely extended to accommodate __________ instruments.

<p>rigid pluggers</p> Signup and view all the answers

Match the following reasons for removing carious dentin with their purposes:

<p>Eliminate bacteria = To mechanically reduce bacteria inside the tooth Remove discoloration = To avoid staining of the crown Prevent saliva leakage = To prevent contamination in the prepared cavity</p> Signup and view all the answers

What controls the direction of the tip of the root canal instrument during a procedure?

<p>Both the clinician's fingers and the canal walls (C)</p> Signup and view all the answers

The toilet of the cavity refers to keeping debris inside the endodontic cavity.

<p>False (B)</p> Signup and view all the answers

What type of access is crucial for allowing endodontic instruments to extend down the canal freely?

<p>direct access to the apical foramen</p> Signup and view all the answers

Flashcards

Maxillary canine root strength

The maxillary canine has the longest and strongest root in the mouth.

Maxillary canine pulp horn

The maxillary canine has a single pointed pulp horn that extends towards the cusp tip.

Maxillary canine root canal

The maxillary canine's root canal configuration is typically one canal (Class I).

Mandibular incisor size

The mandibular incisors are the smallest teeth in the mouth.

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Mandibular incisor root shape

The mandibular incisors may have a straight root or a slightly curved root towards the back.

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Mandibular incisor root canal

Mandibular incisors typically have one main root canal (Class I), but can have two canals (Class II or III).

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Mandibular incisor pulp chamber

Mandibular incisors have a wide pulp chamber in the front-to-back direction.

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Mandibular incisor shoulder

Mandibular incisors have a lingual shoulder at the point where the chamber and canal meet.

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Mandibular First Premolar Root Inclination

The mandibular first premolar has a relatively straight, single pulp canal and a distal-axial inclination of 14 degrees.

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Mandibular First Premolar Pulp Chamber

The mandibular first premolar's pulp chamber is wide from the buccal to the lingual side.

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Maxillary First Molar Roots

The maxillary first molar has three roots: mesiobuccal, distobuccal, and palatal. The palatal root is the longest and strongest.

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Maxillary First Molar Pulp Horns

The maxillary first molar's pulp chamber has four prominent pulp horns, one under each cusp.

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Maxillary First Molar Fourth Mesiobuccal Canal

The maxillary first molar's mesiobuccal root often has a fourth canal, present in 96% of cases.

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Maxillary First Molar Palatal Canal Curvature

The maxillary first molar's palatal canal often has a buccal curvature, present in 55% of cases.

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Mandibular Second Premolar Root Canal Bifurcation

The mandibular second premolar has a single root with a bifurcated canal at the mid-root level.

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Mandibular Second Premolar Root Angulation

The mandibular second premolar's root has a 34-degree buccal-axial angulation.

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What is endodontics?

The branch of dentistry focused on the prevention, diagnosis, and treatment of diseases affecting the pulp and surrounding tissues.

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What are the objectives of endodontic treatment?

A tooth treated endodontically should be biologically healthy, symptom-free, and functioning without any detectable problems.

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What is the Diagnostic phase of endodontic therapy?

The initial stage where the cause of the problem is figured out and a treatment plan is made.

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What is the Preparatory phase of endodontic therapy?

The stage involving cleaning and shaping the root canals to prepare them for filling.

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What is the Obturation phase of endodontic therapy?

The final stage where the root canal system is sealed with inert material to prevent leakage.

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When is endodontic therapy indicated?

Endodontic therapy is successful for teeth with pulpal or periradicular issues.

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In what instances can endodontic therapy be indicated for teeth without infection?

Endodontic treatment might also be considered for teeth without obvious infection, like cases requiring post and core buildup, traumatic pulp exposure, or overerupted teeth.

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What are some contraindications for endodontic therapy?

While endodontics has advanced, some conditions can still hinder treatment, especially in the case of insufficient periodontal support, extensive tooth fractures, or resorption.

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Straight Line Access (SLA)

A preparation that allows a straight, unobstructed path from the occlusal surface to the apex of the root canal.

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Unobstructed Access to Canal Orifices

Ensuring enough tooth structure is removed to allow instruments to enter the canal orifice easily without interference.

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Direct Access to Apical Foramen

Removing enough tooth structure to allow endodontic instruments to reach the apical foramen directly.

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Extension for Filling Techniques

Extending the preparation to accommodate instruments used in filling techniques, especially those with vertical thrust.

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Complete Authority over Instrument

Maintaining complete control over the direction of the instrument during root canal preparation.

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Removal of Caries and Defective Restorations

Removing caries and defective restorations to eliminate bacteria, discolored tooth structure, and potential saliva leakage.

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Toilet of the Cavity

Thorough removal of all caries, debris, and necrotic material from the chamber before beginning root canal preparation.

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Control of Root Canal Instrument

The two factors that control the direction of the instrument in the canal.

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Maxillary First Molar: Mesiobuccal Root Canals

The mesiobuccal root of a maxillary first molar typically has two canals, MB1 and MB2, found in either Class II or Class III configurations. This occurs in 96% of cases.

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Maxillary First Molar: Distobuccal Root Canal

The distobuccal root of a maxillary first molar usually has a single canal in a Class I configuration.

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Maxillary First Molar: Palatal Root Canal

The palatal root of a maxillary first molar typically has a single canal in a Class I configuration.

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Maxillary First Molar: Access Cavity for Four Canals

The access cavity for a maxillary first molar with four root canals takes a trapezoidal shape.

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Maxillary First Molar: Access Cavity for Three Canals

The access cavity for a maxillary first molar with three root canals takes a triangular shape, with the base on the buccal side and the apex pointing palatally.

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Mandibular First Molar: Mesial Root Canals

The mesial root of a mandibular first molar is typically broad in the buccolingual direction and contains two root canals: mesiobuccal and mesiolingual.

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Mandibular First Molar: Distal Root Canals

The distal root of a mandibular first molar usually contains a single canal. However, in approximately 30% of cases, there may be an additional canal, creating two canals: distobuccal and distolingual.

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Mandibular First Molar: Access Cavity Shape

The access cavity for a mandibular first molar with three root canals is triangular, while for those with four root canals, it's trapezoidal in shape.

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Perforation at the mesial-cervical

When the bur is placed too far to the mesial, a perforation may occur on the mesial-cervical side of the tooth due to its tilted position.

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Missed second distal canal

A common error in mandibular molars is to overlook the extra canal, leading to a missed opportunity for proper cleaning and filling.

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Ledge Formation in Mandibular Molars

This occurs when the initial access cavity is not properly shaped, causing uneven access and a 'shelf' for debris to accumulate.

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Perforation of the curved distal root

When the curved distal root is not recognized, a perforation can easily occur due to the lack of awareness of its shape.

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Overextended preparation undermining enamel walls

Overextending the preparation can weaken the enamel walls, making the tooth more prone to fracture.

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Study Notes

Definition of Endodontics

  • Endodontics is the art and science of preventing, diagnosing, and treating pulp and periradicular diseases.

Objectives of Endodontic Treatment

  • Endodontic treatment aims to make the affected tooth biologically acceptable, symptom-free, and functioning without any diagnosable pathosis.

Phases of Endodontic Therapy

  • Endodontic treatment involves three phases:
    • Diagnostic phase: Identifying the cause of the disease and developing a treatment plan.
    • Preparatory phase: Removing pulp chamber contents and shaping root canals to accommodate a three-dimensional filling.
    • Obturation phase: Filling the root canal system with an inert material to ensure a fluid-tight seal.

Contraindications for Endodontic Therapy

  • Modern endodontics can often address conditions previously considered contraindications. However, some conditions require careful consideration:
    • Insufficient periodontal support: Endodontic treatment is planned to maintain retention.
    • Vertical root fracture: Extraction may be the only solution for single-rooted teeth.
    • Extensive internal or external resorption or large perforations: Surgical intervention may be needed.
    • Non-restorable teeth: If treatment cannot restore functionality, extraction is often necessary.
    • Teeth with unsuitable root canals for instrumentation (e.g., calcified canals): Apical surgery or extraction is the recommended resolution
    • Systemic diseases contraindicating surgical endodontics: Certain systemic conditions may prevent surgical intervention.

Macroscopic Anatomy of Pulp Space

  • The pulp space is the internal area of a tooth containing the pulp. The hard tissue surrounding the pulp space varies in configuration and shape.
  • Anatomy includes the coronal pulp (Pulp chamber and pulp horns) and radicular pulp (Root canals).
  • Specific features such as pulp chamber roof, floor, walls, pulp horns, and root canals, including anatomical apex and apical foramen.
  • Types of root canal systems (e.g., class I, class II, class III) are described graphically with associated features (number of canals, orifices, and foramina).

Tooth Morphology and Pulp Space Considerations

  • Detailed descriptions of the maxillary central incisor, lateral incisor, canine, first premolar, second premolar, first molar, and second molar are included in the document.
  • The macroscopic anatomy and tooth morphology are described for each tooth.
  • Features included in the description are a labial view (mesiodistally), proximal view (labiolingually), cross-sections, average length, root canal configuration, and outline form of access cavities.

Endodontic Cavity Preparation

  • The process involves two basic steps: coronal preparation (access cavity) and radicular preparation.
  • Access cavity preparation has the following key aspects: Outline form, convenience form, removal of carious dentin/defective restoration, and toilet of the cavity.
  • Factors such as the size and shape of the pulp chamber and the curvature of the root canals influence access cavity preparation.
  • Errors in access cavity preparation are described, with specific instances in anterior teeth and premolars and molars in both maxillary and mandibular arches

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Description

Test your knowledge of endodontic therapy with this quiz. It covers phases of treatment, indications, and specific anatomical details related to root canals. Perfect for dental students and professionals looking to refresh their understanding of endodontics.

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