Dental Instruments for Fixed Prosthodontics
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Dental Instruments for Fixed Prosthodontics

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Questions and Answers

Which of the following instruments are classified as cutting instruments?

  • Scalers (correct)
  • Mirrors
  • Explorers
  • Amalgam condensers

    • What materials are commonly used in the construction of hand instruments?

  • Ceramic
  • Aluminum
  • Plastic
  • Carbon steel (correct)

    • Which component is NOT part of the basic design of hand instruments?

  • Shank
  • Grip (correct)
  • Hand
  • Blade

    • What defines a rotary cutting instrument?

    <p>It is held and operated by a removable hand piece</p> Signup and view all the answers

    Which type of hand piece is classified by its shape?

    <p>Straight hand piece</p> Signup and view all the answers

    Which type of instruments are designed for cutting in fixed prosthodontics?

    <p>Hand cutting instruments</p> Signup and view all the answers

    What is the primary function of cutting instruments in dentistry?

    <p>To cut, file, grind, plane, or smoothen dental structures</p> Signup and view all the answers

    Which of the following is NOT classified as a hand cutting instrument?

    <p>Dental lasers</p> Signup and view all the answers

    Which of these instruments is an example of a hand cutting instrument?

    <p>Straight chisel</p> Signup and view all the answers

    What distinguishes powered (rotary) cutting instruments from hand cutting instruments?

    <p>Rotary instruments are more precise and faster.</p> Signup and view all the answers

    Which of the following dental instruments is used primarily for excavating dental caries?

    <p>Angle former</p> Signup and view all the answers

    What is a primary characteristic of laser equipment in dentistry?

    <p>It employs light energy to cut or ablate tissues.</p> Signup and view all the answers

    Which type of cutting instrument includes tools like enamel hatchets and gingival marginal trimmers?

    <p>Hand cutting instruments</p> Signup and view all the answers

    What is the power source classification for a contra angle handpiece?

    <p>Air turbine</p> Signup and view all the answers

    How is the rotational speed of an instrument measured?

    <p>Revolutions per minute (rpm)</p> Signup and view all the answers

    What classification is assigned to speeds above 200,000 rpm?

    <p>Ultrahigh speeds</p> Signup and view all the answers

    Which of the following is NOT a common design element of rotary cutting instruments?

    <p>O-ring</p> Signup and view all the answers

    Which type of shank design is characterized by adaptability to various handpieces?

    <p>Latch-type shank</p> Signup and view all the answers

    What materials are commonly used for dental burs?

    <p>Steel and carbide</p> Signup and view all the answers

    How are abrasive instruments often classified?

    <p>By material and size</p> Signup and view all the answers

    What is the primary benefit of using diamond instruments?

    <p>Durability and sharpness of cutting edge</p> Signup and view all the answers

    Which of the following shapes is NOT recognized for rotary cutting instruments?

    <p>Flat blade</p> Signup and view all the answers

    What comprises the design of a diamond instrument?

    <p>Metal blank, diamond powder, and metallic bonding material</p> Signup and view all the answers

    What distinguishes mounted type dental rotary instruments from demounted type instruments?

    <p>Mounted types are attached to their working points.</p> Signup and view all the answers

    Which abrasive material is known for removing hard tooth structures through continuous air-driven action?

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

    What is the primary mechanism of cutting used by burs?

    <p>Shearing action</p> Signup and view all the answers

    Which option correctly describes the use of lasers in dental treatment?

    <p>They are used for treatment of soft tissue and modifying hard tooth structure.</p> Signup and view all the answers

    What is a key disadvantage of using abrasive equipment in a clinical setting?

    <p>They complicate visibility during procedures.</p> Signup and view all the answers

    Which type of abrasive instruments are made by pressing a uniform mixture around a roughened shank end?

    <p>Molded abrasive instruments</p> Signup and view all the answers

    What distinguishes diamonds in cutting efficiency compared to carbide burs?

    <p>Diamonds provide rough surfaces and irregular finishes.</p> Signup and view all the answers

    What type of backing is commonly used in coated abrasive instruments?

    <p>Flexible rubber backing</p> Signup and view all the answers

    What is a primary application of dental abrasive equipment?

    <p>Stain removal</p> Signup and view all the answers

    Which of the following best describes coated abrasive instruments?

    <p>A layer of abrasive is cemented to a flexible backing.</p> Signup and view all the answers

    Study Notes

    Dental Instruments

    • Dental instruments are tools used in fixed prosthodontics to modify dental structures
    • Cutting instruments cut, file, grind, plane, or smoothen dental structuresc
    • Non-cutting instruments are used for tasks like condensation, examination, and exploration
    • Hand cutting instruments include excavators, chisels, knives, files, scalers, and carvers
    • Hand non-cutting instruments include amalgam condensers, mirrors, probes, and explorers
    • Hand instruments are light in weight and made from carbon steel, stainless steel, or carbide
    • Rotary cutting instruments are held and operated by a removable shank called a handpiece
    • Handpieces are classified as straight, contra-angle, and based on their power source (air turbine or electric motor)
    • Rotary instruments are categorized based on speed: low (below 12,000 rpm), medium (12,000-200,000 rpm), and high (above 200,000 rpm)
    • Rotary cutting instruments consist of a head, neck, and shank
    • There are three main shank designs: straight shank, latch-type shank, and grip-type shank
    • Head design is further categorized into abrasive instruments and dental burs
    • Dental burs are cutting instruments with bladed cutting heads, made from steel or carbide
    • Dental burs are classified by size (head diameter in tenths of a millimeter) and shape (round, inverted cone, taper fissure, and end cutting)
    • Abrasive instruments use small, angular particles of a hard substance embedded in a softer matrix material
    • Abrasive instruments are classified as diamond instruments and other abrasives
    • Diamond instruments consist of a metal blank, powder diamond abrasive, and metallic bonding material
    • Diamond instruments are classified by size and shape: rounded end wheel, flame shape, fine taper, taper stone with flat end, and taper stone with round end
    • Other abrasive instruments can be either molded or coated: molded instruments use a mixture of abrasive particles and matrix, while coated instruments have a layer of abrasive cemented to a flexible backing
    • Dental rotary instruments are supplied as mounted (with mandrel attached) or demounted (requiring a separate mandrel)
    • Abrasive instruments work by abrading or wearing, while dental burs cut by shearing (primarily from the sides)
    • Diamond instruments are more efficient but produce rough surfaces, while carbide burs cut more slowly but create smoother finishes
    • Laser equipment provides high-intensity light beams for soft and hard tissue modification
    • Abrasive equipment uses aluminum oxide to rapidly remove hard tooth structures
    • Clinical problems with abrasive equipment include lack of tactile sense, difficulty determining cutting progress, interference with visibility, and potential for inhalation
    • Abrasive equipment applications include stain removal, pit and fissure de-pridment prior to sealing, and micro-mechanical roughening

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    Dental Instruments PDF

    Description

    Explore the essential dental instruments used in fixed prosthodontics, focusing on both cutting and non-cutting tools. Learn about hand instruments, rotary cutting instruments, and their classifications. This quiz will enhance your understanding of the tools vital for modifying dental structures.

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