Preparation for Inlays and Onlays
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Questions and Answers

What is the main aim of tooth preparation for inlays and onlays?

  • To create deep undercuts in the cavity walls
  • To remove as much tooth tissue as possible
  • To speed up the process of indirect restoration
  • To give an adequate amount of protection to the tooth (correct)
  • Why should the preparation of opposing cavity walls be cut to avoid undercuts?

  • To add complexity to the process
  • To make the restoration process faster
  • To ensure optimum retention from the cavity shape (correct)
  • To reduce the strength of the final restoration
  • What type of cavity shape is recommended for inlays and onlays completed with all-ceramic material?

  • Irregular shape
  • Highly undercut shape
  • Parallel walls shape
  • Slightly under-tapered shape (correct)
  • Why must the preparation shape have parallel walls for indirect restorations using gold material?

    <p>To gain retention from the cavity shape</p> Signup and view all the answers

    What is the purpose of a provisional restoration made using materials like ProTemp?

    <p>To protect the tooth from sensitivity and bacterial contamination</p> Signup and view all the answers

    At which appointment during the process are putty and wash impressions taken of the prepared tooth?

    <p>During the first appointment</p> Signup and view all the answers

    What is the recommended range for occlusal reduction during tooth preparation?

    <p>0.5mm-2mm</p> Signup and view all the answers

    What angle should the bur be held at to create a functional occlusal bevel on the occlusal loading cusp of molar teeth?

    <p>45 degrees</p> Signup and view all the answers

    Which type of bur is preferred for creating a functional occlusal bevel on molar teeth?

    <p>High-speed diamond fissure bur</p> Signup and view all the answers

    Which cusp should be considered when creating a functional occlusal bevel on mandibular teeth?

    <p>Buccal cusp</p> Signup and view all the answers

    What is the most convenient shape of bur for preparing buccal, lingual, and proximal reduction of the tooth?

    <p>High-speed tapered diamond bur</p> Signup and view all the answers

    What approach can be taken to eliminate undercuts from the preparation during inlay preparation?

    <p>Creating divergent cavity needed by removing tooth tissue</p> Signup and view all the answers

    Study Notes

    Preparation for Inlays and Onlays

    • The goal of tooth preparation is to preserve more tooth tissue while providing adequate protection, compared to a crown preparation.

    Tooth Preparation

    • Start with occlusal reduction, ranging from 0.5mm-2mm depending on the restorative material used.
    • Use a high-speed diamond fissure bur, following the inclination of the cusps and grooves to preserve tooth tissue.
    • Create a functional occlusal bevel on the occlusal loading cusp of molar teeth, holding the bur at a 45o angle to the occlusal surface.

    Reduction of Cavity Walls

    • Prepare opposing cavity walls to avoid undercuts, ensuring optimum retention from the cavity shape for the indirect restoration.
    • For all-ceramic restorations, cavity shapes can be slightly over-tapered, as most retention comes from the cement lute.
    • For gold restorations, prepare parallel cavity walls, as most retention comes from the cavity shape.

    Appointment Process

    • The process typically involves two appointments: preparation at the first visit, and cementation at the second.
    • Take a putty and wash impression of the prepared tooth at the first visit, to be sent to the laboratory for fabrication.
    • Create a provisional restoration using material like ProTemp to protect the tooth and maintain aesthetics.

    Converting a Class II Restoration

    • When preparing an inlay, the existing Class II restoration is removed, and the cavity is converted by eliminating undercuts.
    • This can be done by either blocking undercuts with an adhesive restorative material or removing tooth tissue to create a divergent cavity.

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    Description

    Learn about the tooth preparation process for inlays and onlays, focusing on preserving tooth tissue and providing adequate protection. Understand how to cut opposing cavity walls to avoid undercuts for optimal retention of indirect restorations.

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