Temporary Crowns in Dentistry
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Questions and Answers

What is the purpose of tapering a tooth before placing a crown?

  • To increase the strength of the tooth structure
  • To ensure the crown fits properly (correct)
  • To prevent tooth decay in the surrounding area
  • To reduce the tooth size and enhance aesthetics

    • What type of impression is made of the prepared tooth for a crown?

  • Positive reproduction
  • Direct impression
  • Functional impression
  • Negative reproduction (correct)

    • What is the role of the finish line in tooth preparation for a crown?

  • It provides a guide for shaping the temporary restoration (correct)
  • It is where the tooth begins to decay
  • It marks the end of enamel removal
  • It indicates the level of the gum line

    • How long does it typically take to make a permanent crown for a tooth?

    <p>Two separate appointments</p> Signup and view all the answers

    What procedure may be required if a tooth is too broken down before placing a crown?

    <p>Post and core buildup</p> Signup and view all the answers

    What is the primary purpose of contouring and crimping pliers in crown preparation?

    <p>To bend cervical margins for a snug fit</p> Signup and view all the answers

    What is the key component of Zinc Oxide and Eugenol temporary cement that gives it a sedative effect on the pulp?

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

    How should the powder and liquid components of the temporary cement be combined?

    <p>By mixing them on a parchment mixing pad or cool glass slab</p> Signup and view all the answers

    What effect does adding water during the manufacturing of Zinc Oxide have?

    <p>Reduces the shelf life</p> Signup and view all the answers

    What is the recommended mixing time for Zinc Oxide and Eugenol temporary cement?

    <p>8 minutes</p> Signup and view all the answers

    What is the mixing medium used for temporary crowns?

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

    What is the duration for which TEMPBOND is expected to last?

    <p>6 months</p> Signup and view all the answers

    Which item is NOT part of the armamentarium for temporary crown preparation?

    <p>Bite block</p> Signup and view all the answers

    When preparing a temporary crown, what should be done after inscribing the trim line?

    <p>Trim the excess and smooth the margins.</p> Signup and view all the answers

    Which type of TEMPBOND allows for single-dose mixing?

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

    Why is it important for a patient to return for a permanent crown after using a temporary crown?

    <p>To avoid potential recurrent decay.</p> Signup and view all the answers

    What should the ball burnisher primarily be used for in temporary crown preparation?

    <p>Smoothing the inner surface of the crown</p> Signup and view all the answers

    What is the purpose of crimping the margin of the temporary crown?

    <p>To ensure a tight fit on the tooth.</p> Signup and view all the answers

    What sound indicates that a temporary crown is fitting snugly into place?

    <p>A snapping sound</p> Signup and view all the answers

    Which of the following steps is NOT part of the temporary crown preparation process?

    <p>Mixing the permanent cement</p> Signup and view all the answers

    During cementation, what is the purpose of placing cotton rolls in the buccal and lingual areas?

    <p>To maintain dry conditions</p> Signup and view all the answers

    What should be done to excess cement after cementation of the crown?

    <p>Remove it carefully with an explorer or scaler</p> Signup and view all the answers

    What must be checked with the use of articulating paper after seating the temporary crown?

    <p>The occlusion and contact points</p> Signup and view all the answers

    What is the primary purpose of placing a temporary crown?

    <p>To maintain function and reduce sensitivity until the permanent crown is placed</p> Signup and view all the answers

    Which type of temporary crown is known for its ease of adjustment due to malleability?

    <p>Aluminum crown</p> Signup and view all the answers

    What is a major advantage of using aluminum crowns?

    <p>They can be easily contoured and burnished</p> Signup and view all the answers

    What limitation of aluminum crowns should be considered during treatment?

    <p>They are aesthetically unsuitable for visible teeth</p> Signup and view all the answers

    During the crown fitting procedure, what is the maximum occluso-cervical height the crown should extend below the free gingival margins?

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

    What material is commonly used to cover cavity medications in the crown preparation process?

    <p>Dycals (CaOH)</p> Signup and view all the answers

    Which of the following is NOT a type of temporary crown mentioned?

    <p>Ceramic crown</p> Signup and view all the answers

    What must the dentist ensure when selecting a temporary crown for a tooth?

    <p>It fits both the circumference and mesio-distal dimensions of the tooth</p> Signup and view all the answers

    Study Notes

    Temporary Crowns

    • Temporary crowns are used when a tooth requires a permanent crown but needs to be protected in the meantime.
    • The dentist may need to build up the tooth with filling material if a large portion of the tooth has been broken down, making it taller before preparing it for the crown.
    • When preparing a tooth for a crown, the dentist reduces the size of the tooth and shapes it in a specific taper, ensuring the crown fits properly.
    • The finish line, also known as the gingival line or CEJ, marks where the tooth preparation ends.
    • The dentist takes an impression of the prepared tooth to create a model used for fabricating the permanent crown.
    • A temporary crown is placed over the prepared tooth until the permanent crown is ready.
    • The temporary crown protects the tooth, avoids sensitivity, and maintains function and aesthetics.
    • Temporary crowns are also used for primary teeth.

    Types of Temporary Crowns

    • Custom-constructed crowns: Made specifically for the patient's tooth.
    • Pre-formed acrylic crowns: Ready-made acrylic crowns that are adjusted to fit the tooth.
    • Pre-formed metal crowns: Thin metal or aluminum crowns, commonly used on premolars and molars.

    Aluminum Crowns

    • Used most commonly on premolars and molars.
    • Advantages include resistance to wear, strength, malleability.
    • Can be contoured and burnished without wrinkling.
    • The chief disadvantage is its softness, making it prone to wear quickly.

    Placement of Preformed Aluminum Crowns

    • Step I: The dentist prepares the tooth, reducing its circumference and height, removes decay, and places cavity medications.
    • Step II: The dentist selects the proper crown, ensuring it fits the tooth's circumference and mesio-distal dimensions.
    • Step III: The dentist adjusts the occluso-cervical height of the crown to ensure it does not extend more than 2mm below the free gingival margin. The crown is then trimmed and smoothed.
    • Step IV: The dentist uses zinc oxide and eugenol (ZOE) temporary cement to secure the crown. The cement provides a sedative effect on the pulp and is mixed on a parchment mixing pad or a cool glass slab.
    • Step V: The dentist places the cement on the crown, seats the crown, and removes excess cement.

    Patient Instructions

    • Patients should chew and eat with the temporary crown as they would a natural tooth.
    • The crown will last approximately six months due to the weak luting cement.
    • Patients should brush and care for the temporary crown as they would a natural tooth.
    • The crown should be replaced if it falls off or becomes loose.

    Evaluation Criteria for Temporary Crown Placement

    • Crown Selection: The correct crown size and shape.
    • Crown Trimming: Smooth, well-trimmed edges.
    • Crimping and Contouring: Properly crimped and contoured margins.
    • Snug Fitting: The crown fits snugly and securely on the prepared tooth.
    • Contact with Adjacent Teeth: The temporary crown contacts the adjacent teeth.
    • Smooth Surfaces: Smooth surfaces free of voids or rough edges.
    • Excess Cement Removal: All excess cement is removed.
    • Occlusion: The crown contacts the opposing teeth correctly.

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    Related Documents

    Temporary Crowns PDF - DHY8150 Dental Materials

    Description

    Explore the essential role of temporary crowns in dental procedures. This quiz covers their purpose, preparation process, and the types of temporary crowns available. Ideal for dental students and practitioners seeking to enhance their understanding of this crucial aspect of restorative dentistry.

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