Dental Dentin Quiz
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Questions and Answers

What characterizes arrested caries involving dentin?

  • Absence of secondary dentin formation
  • Complete obliteration of all dentinal tubules
  • Marked brown pigmentation of dentin (correct)
  • Presence of large cavities with retained food
  • What is sclerotic dentin primarily known for?

  • Decreased hardness and density
  • Formation of large cavities due to food retention
  • Increased sensitivity of the pulp
  • Enhanced protection of the pulp against irritation (correct)
  • What occurs when further irritation affects the dentin?

  • Reversal of the sclerotic process
  • Formation of a Calcific Barrier (correct)
  • Dissolution of peritubular dentin
  • Increased permeability of tubules
  • What is a notable consequence of sclerosis in dentin?

    <p>Obliteration of peripheral dentinal tubules</p> Signup and view all the answers

    How does the dentin respond to irritation with regard to Tome's fibers?

    <p>They undergo mineralization and deposit peritubular dentin</p> Signup and view all the answers

    What is the required condition of the tooth before performing direct pulp capping?

    <p>It must be asymptomatic and vital.</p> Signup and view all the answers

    Which of the following is NOT a favorable condition for direct pulp capping?

    <p>Spontaneous pain before the procedure.</p> Signup and view all the answers

    What is the purpose of provisional restoration after pulp capping?

    <p>To allow healing and monitor the tooth for 6-12 weeks.</p> Signup and view all the answers

    Which step of the procedure involves managing the site of pulp exposure?

    <p>Direct pulp capping.</p> Signup and view all the answers

    What type of restoration is recommended for teeth with pulp exposure that shows signs of vitality?

    <p>Direct pulp capping.</p> Signup and view all the answers

    Which condition is critical for the prognosis of pulp capping when an exposure occurs?

    <p>A completely dry operative field.</p> Signup and view all the answers

    What approach is taken when the pulp exposure is extensive and cannot ideally be capped?

    <p>Step-wise excavation is preferred.</p> Signup and view all the answers

    What is the first action in the management of deep dentin caries with a potential pulp exposure?

    <p>Assessment of symptomatic response.</p> Signup and view all the answers

    What is one of the criteria for success in dental treatment as mentioned?

    <p>Radiographic evidences of reparative dentine formation</p> Signup and view all the answers

    Which statement accurately describes the management of extensive active caries in multiple teeth?

    <p>Infected dentin is removed and temporary restorations are placed.</p> Signup and view all the answers

    Which of the following is NOT a part of the criteria for dental treatment success?

    <p>Patient exhibits ongoing discomfort</p> Signup and view all the answers

    What is the role of calcium hydroxide in dental treatments as mentioned?

    <p>Stimulates tertiary dentin formation</p> Signup and view all the answers

    What does the procedure of treating multiple teeth with caries aim to achieve?

    <p>Stop the progress of caries in multiple teeth</p> Signup and view all the answers

    Why is annual recall significant in dental treatment success criteria?

    <p>It ensures ongoing assessment of tooth health.</p> Signup and view all the answers

    What is one benefit of treating multiple teeth with extensive caries at once?

    <p>It enables more teeth to remain serviceable.</p> Signup and view all the answers

    What is a sign of treatment success according to the criteria provided?

    <p>Formulation of reparative dentine</p> Signup and view all the answers

    Which zone is characterized by being soft, lighter in color, non-sensitive, and infected?

    <p>Zone 1: Infected</p> Signup and view all the answers

    What is the characteristic of Zone 3?

    <p>Dead and un-re-mineralizable</p> Signup and view all the answers

    What describes Zone 4?

    <p>Affected and sub-transparent</p> Signup and view all the answers

    In the context of cavity preparation, selective removal to firm dentin is recommended for which type of lesions?

    <p>Shallow or moderately deep lesions</p> Signup and view all the answers

    What is indicated by dentin that deforms when an instrument is pressed into it?

    <p>It is soft dentin</p> Signup and view all the answers

    What characteristic indicates that Zone 5 is normal?

    <p>It has intact collagen matrix</p> Signup and view all the answers

    Which statement is true about Zone 2?

    <p>It is turbid and collagen is irreversibly denatured</p> Signup and view all the answers

    When excavating for a restoration, what is the purpose of reaching hard dentin?

    <p>To seal the margin and increase the longevity of the restoration</p> Signup and view all the answers

    What is always recommended to be used with amalgam restorations?

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

    What type of material is required as a base for metallic final restorations in moderately deep cavities?

    <p>Reinforced or resin modified GI material</p> Signup and view all the answers

    What technique might be used in moderately deep cavities for direct composite restorations?

    <p>Sandwich technique</p> Signup and view all the answers

    Which of the following is NOT a reason for using a layer of flowable composite under packable composites?

    <p>To provide additional color matching</p> Signup and view all the answers

    What dimension is particularly relevant when considering the location of cavity margins in relation to the central fissure?

    <p>Distance to cusp tip</p> Signup and view all the answers

    In cases of deep cavities, what kind of material might be used for the base under direct composites?

    <p>Resin-based base</p> Signup and view all the answers

    What depth range is specifically noted for moderate cavities requiring additional restorative measures?

    <p>2-4 mm</p> Signup and view all the answers

    For effective function, which one of the following stresses must be considered when placing cavity margins?

    <p>Functional and non-functional stresses</p> Signup and view all the answers

    What is a major drawback of using Biodentin?

    <p>It relies mainly on micromechanical bonding.</p> Signup and view all the answers

    What does TheraCal LC not require for its setting process?

    <p>The presence of water.</p> Signup and view all the answers

    What is one of the advantages of TheraCal LC?

    <p>It shows lower solubility than other materials.</p> Signup and view all the answers

    How can the need for a specific liner or base be determined?

    <p>By the thickness of remaining dentin.</p> Signup and view all the answers

    What is one of the drawbacks of TheraCal LC?

    <p>It has lower bioactive potential due to resin components.</p> Signup and view all the answers

    Which of the following factors influences the selection of a liner or base?

    <p>Adhesive properties of restorative material.</p> Signup and view all the answers

    What characteristic makes TheraCal LC facilitate the placement of final restoration?

    <p>Its fast setting time.</p> Signup and view all the answers

    What is a necessary condition for applying adhesive materials?

    <p>They should always be applied directly.</p> Signup and view all the answers

    Study Notes

    Conservative Management of Residual Caries

    • Complete caries removal is necessary to eliminate all bacterial traces of carious dentin.
    • If pulp exposure occurs, endodontic treatment is required.
    • Partial caries removal differentiates between affected and infected dentin (using a caries detector dye).
    • Chemo-mechanical caries removal (e.g., Carisolv, ozone, enzymes, laser cutting) is employed.
    • Indirect pulp capping is used if pulp is exposed.
    • Direct pulp capping can be used as well and depends on indication.

    Caries Removal Techniques

    • Avoid burs with sharp edges for pulpal and axial walls.
    • Employ low-speed round burs for caries removal.
    • Do not leave undermined enamel occlusally.
    • Do not flatten pulpal or axial walls of a tooth during caries removal.
    • Remove only the infected carious material, preserving the rounded or concave shape of the remaining wall that surrounds the caries removal depression.
    • Remove residual caries from the DEJ (dentinoenamel junction) or enamel wall.

    Differentiation Between Acute and Chronic Caries

    • Acute caries involves multiple teeth and shows a lighter color.
    • Chronic caries is slow-developing and displays a dark brown or leathery appearance.
    • Caseous consistency is a feature of acute caries, making excavation challenging.
    • Sensitivity is often higher in acute caries.

    Arresting Caries

    • Arrested caries presents stationary or static conditions without progression.
    • Sclerotic dentin, a hard, dark discoloration of the tooth, is a sign of arrested caries.
    • Sclerosis of the dentinal tubules and secondary dentin formations are commonly associated with arrested caries.

    Sclerotic Dentin

    • The dentin hardens, becomes denser, less sensitive and more protective toward the pulp.
    • Mineralization occurs around the peritubular dentin.
    • The ends of Tomes fibers transform into a calcified barrier or calcific barrier.

    Direct Pulp Capping

    • Successful direct pulp capping is more likely when the tooth is asymptomatic before the procedure, the exposure is 0.5 mm or less, there is reduced hemorrhage, the procedure is atraumatic and the tooth is not desiccated.

    Caries Control Techniques

    • Extensive active caries in many teeth can be addressed in one visit through removal of infected dentin and temporary restorations for each tooth.

    Removing Undermined Enamel and Caries

    • Demineralized enamel appears opaque and chalky, whereas carious dentin appears soft, mushy, gummy, leathery, or sticky.
    • Removing undermined enamel and carious dentin at the Dentin-Enamel Junction (DEJ) is crucial.

    Pulp Capping Materials

    • Calcium hydroxide is capable of stimulating tertiary dentin formation, but it's susceptible to moisture and resorbs over time.
    • Mineral trioxide aggregate (MTA) material has biocompatibility and induces calcium phosphate formation at the interface of the pulp and periodontium.
    • Biodentine, a calcium silicate-based material, creates homogeneous dentin and is bioactive, with an easy handling profile and short setting time.

    Pulp Capping Criteria

    • Vital pulp preservation and absence of symptoms are ideal criteria for successful pulp capping.
    • Absence of periapical changes on radiographic examination, with radiographic evidence of reparative dentin formation.
    • Periodic follow-ups are necessary to monitor the patient's condition.

    Liners and Bases

    • Liners and bases depend on dentin thickness, restorative type (metallic or non-metallic) and adhesive properties.
    • They're applied at the pulpal floor close to the pulp for maximum effectiveness.

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    Description

    This quiz explores key concepts related to dentin and how it responds to caries and irritation. It covers the characteristics of arrested caries, sclerotic dentin, and the responses of dentin to further irritation. Test your knowledge on this vital aspect of dental health.

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