Complete Denture Construction Steps
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Questions and Answers

What is the temperature of the boiling water used in the process?

  • 80 C
  • 110 C
  • 100 C (correct)
  • 90 C

    • What is the purpose of applying wax solvent with hot water?

  • To inject acrylic resin
  • To remove all traces of wax (correct)
  • To apply separating medium
  • To pack the mold

    • What is the purpose of creating small retentive pot holes on the artificial teeth?

  • To prevent passage of water from gypsum to resin
  • To increase the attachment between teeth and denture base (correct)
  • To facilitate separation of flasks
  • To decrease the attachment between teeth and denture base

    • Why is separating medium applied to all surfaces except teeth?

    <p>To minimize passage of monomer to stone</p> Signup and view all the answers

    What is the advantage of injection molding technique over compression molding technique?

    <p>Higher impact strength</p> Signup and view all the answers

    What is the disadvantage of injection molding technique?

    <p>More expensive equipment</p> Signup and view all the answers

    What is the purpose of wax contouring in complete denture construction?

    <p>To reproduce natural tissue contour</p> Signup and view all the answers

    What is the purpose of heating the flask in a microwave oven?

    <p>To soften the wax</p> Signup and view all the answers

    What is the next step after investing the denture in the complete denture processing sequence?

    <p>Boil out (wax elimination)</p> Signup and view all the answers

    What is the final step in the injection molding technique?

    <p>Injecting acrylic resin into the mold</p> Signup and view all the answers

    What is the function of the strip of wax placed from the gingival third of the teeth to the peripheral border?

    <p>To prevent cheek and lip biting</p> Signup and view all the answers

    What is the purpose of festooning in complete denture construction?

    <p>To enhance retention and stability</p> Signup and view all the answers

    What is the purpose of remounting in complete denture construction?

    <p>To ensure proper fit and occlusion of the denture</p> Signup and view all the answers

    What is the purpose of finishing and polishing in complete denture construction?

    <p>To ensure a smooth, glossy surface for the denture</p> Signup and view all the answers

    What is the purpose of curing in complete denture processing?

    <p>To polymerize the acrylic resin</p> Signup and view all the answers

    What is the purpose of remounting the stone casts on the articulator?

    <p>To remove occlusal errors during processing</p> Signup and view all the answers

    What is the result of contraction of monomer during polymerization?

    <p>Porosity in the denture base</p> Signup and view all the answers

    What is the effect of small voids or pores within the acrylic resin denture base?

    <p>It makes the denture weaker and difficult to clean</p> Signup and view all the answers

    What is the purpose of making new maxillo-mandibular relation records?

    <p>To establish the correct vertical dimension</p> Signup and view all the answers

    What is the term for the appearance of small particles of stone on the surface of the denture?

    <p>Sandy appearance</p> Signup and view all the answers

    What is the result of errors in processing during denture fabrication?

    <p>All of the above</p> Signup and view all the answers

    What is the term for the small voids or pores within the acrylic resin denture base?

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

    What is the purpose of finishing and polishing the denture?

    <p>To remove any flash of acrylic resin</p> Signup and view all the answers

    What is the ratio of heat cure acrylic resin polymer to monomer by volume?

    <p>3:1</p> Signup and view all the answers

    What is the characteristic of the mixture in stage II (STRINGY STAGE)?

    <p>The monomer attacks the surfaces of individual polymer beads</p> Signup and view all the answers

    What is the purpose of placing a piece of wet cellophane over the resin before assembling the flask?

    <p>To allow the flask to be reopened for inspection and adding or removing resin</p> Signup and view all the answers

    At what stage is the mixture packed into the mold?

    <p>DOUGH STAGE</p> Signup and view all the answers

    What is the pressure at which the flask is closed?

    <p>Around 3000 psi</p> Signup and view all the answers

    What is removed from the flask after it is opened carefully?

    <p>The excess resin</p> Signup and view all the answers

    Why is the press secured with positive pressure?

    <p>To ensure the metal edges of the flask are in complete contact</p> Signup and view all the answers

    What is the final stage of the process?

    <p>The process is repeated until there is no more appreciable flash</p> Signup and view all the answers

    What is a common cause of gaseous porosity in dentures?

    <p>Excessive monomer in mix</p> Signup and view all the answers

    What is a common cause of granular porosity in dentures?

    <p>Excessive polymer</p> Signup and view all the answers

    What is a common cause of tooth movements during denture fabrication?

    <p>Using plaster instead of stone</p> Signup and view all the answers

    What is a common cause of denture base and teeth breakage during deflasking?

    <p>Using a hammer to tap the denture out of the flask</p> Signup and view all the answers

    What is a common cause of fractured or cracked teeth during denture fabrication?

    <p>Packing of resin in the rubbery stage</p> Signup and view all the answers

    What is a common cause of crazing of acrylic resin?

    <p>Stress induced by contraction of resin around the tooth</p> Signup and view all the answers

    What is a common cause of bleaching of acrylic resin?

    <p>Contamination of the acrylic resin with acrylic solvents</p> Signup and view all the answers

    What is a common cause of sandy appearance of the denture?

    <p>Too much delay in curing after packing</p> Signup and view all the answers

    Study Notes

    Complete Denture Construction

    • The process of complete denture construction involves both clinical and laboratory steps.

    Steps of Complete Denture Construction

    • Clinical steps:
      • Wax contouring (festooning)
      • Flasking (investing the denture)
      • Boil out (wax elimination)
      • Packing of acrylic resin
      • Curing
      • Deflasking of denture
      • Remounting
      • Finishing and polishing
    • Laboratory steps:
      • Wax contouring (festooning)
      • Flasking (investing the denture)
      • Boil out (wax elimination)
      • Packing of acrylic resin
      • Curing
      • Deflasking of denture
      • Remounting
      • Finishing and polishing

    Wax Contouring (Festooning)

    • The process of carving the denture base to simulate the contour of the natural tissues that are being replaced by the denture.
    • Purpose:
      • To reproduce natural tissue contour
      • To enhance retention and stability
      • To refine wax-up having self-cleansing contours
      • To enhance esthetics and support for the lips and cheeks
      • To prevent cheek and lip biting

    Flasking (Investing the Denture)

    • The process of investing the denture in a flask.
    • The flask is placed into boiling water (100°C) for 5 minutes to remove the wax.
    • The wax denture is removed from the mold as one piece.

    Boil Out (Wax Elimination)

    • The process of removing the wax from the mold using boiling water.
    • The wax is eliminated, and the mold is washed with hot water to remove any remaining wax.

    Packing of Acrylic Resin

    • The process of packing the acrylic resin into the mold.
    • The resin is mixed according to the manufacturer's ratio and is packed into the mold in the dough stage.
    • A piece of wet cellophane is placed over the resin before the flask is assembled to allow for inspection and addition or removal of resin.

    Curing

    • The process of polymerizing the acrylic resin.
    • The flask is placed in a press and subjected to pressure (around 3000 psi) to ensure that the resin is properly polymerized.

    Deflasking of Denture

    • The process of removing the denture from the flask.
    • The excess acrylic resin is trimmed, and the metal edges of the flask are ensured to be in complete contact.

    Remounting

    • The process of repositioning the stone casts on the mounting plaster, which is attached to the articulator.
    • The purpose is to re-establish the occlusal vertical dimension and make any necessary adjustments.

    Finishing and Polishing

    • The process of removing any flash or excess material from the denture.
    • Any dental stone on the surface of the denture is removed, and the denture is polished to a high shine.

    Processing Errors

    • Porosity:
      • Causes: contraction, gaseous, or granular porosity
      • Consequences: difficult to clean, esthetically objectionable, and weak
    • Tooth movements:
      • Causes: using plaster instead of stone, incomplete closure of flask, excessive rapid pressure during trial closure, or over packing of the mold
    • Denture base and teeth breakage during deflasking:
      • Causes: poor removal of stone cap, using a hammer to tap denture out of the flask
    • Fractured or cracked teeth:
      • Causes: packing resin in rubbery stage, setting teeth directly on stone cast, or excessive pressure during packing
    • Crazing of acrylic resin:
      • Causes: stress induced by contraction of resin around the tooth, use of solvents to remove wax from the mold
    • Bleaching of acrylic resin:
      • Causes: contamination of acrylic resin with acrylic solvents, under-cured acrylic resin due to incorrect time and temperature of curing
    • Color streaks:
      • Causes: improper mixing of monomer and polymer, contamination of resin mix with hands, or adding resin material in layers during trial packing
    • Sandy appearance:
      • Causes: too much delay in curing, evaporation of monomer, or insufficient monomer in the mix
    • Stone adhering to the surface of the denture:
      • Causes: insufficient separating medium on the mold, application of separating medium contaminated with stone, or incomplete elimination of wax
    • Space between the teeth and resin base:
      • Causes: delayed curing, application of separating medium on teeth

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    Description

    This quiz covers the clinical and laboratory steps involved in the construction of complete dentures, useful for prosthodontics students and professionals.

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