Complete Denture Anatomy Quiz
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Questions and Answers

What is the primary objective in the fabrication of a complete denture?

  • To ensure maximum retention without considering anatomy
  • To provide function, anatomy, and aesthetics while preserving underlying structures (correct)
  • To improve aesthetics only
  • To focus solely on comfort

    • Relief areas are designed to carry the maximum load without any trauma.

    False

    Name the three groups into which landmarks of an edentulous jaw are categorized.

    Limiting structures, supporting structures, relief areas

    The areas on a denture that primarily bear load are called _______.

    <p>supporting structures</p> Signup and view all the answers

    What can happen if a denture encroaches on limiting structures?

    <p>Decreased retention and soreness</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Limiting structures = Guide optimal extension of the denture Supporting structures = Load-bearing areas of the denture Relief areas = Fragile structures under thin mucosa Displacement = Movement of the prosthesis away from the basal tissue</p> Signup and view all the answers

    Supporting structures concentrate the load applied to the areas of a complete denture.

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

    What is the consequence of failing to cover areas up to the limiting structure?

    <p>Decreased retention, stability, and support</p> Signup and view all the answers

    What is one of the functions of the posterior palatal seal?

    <p>Aids in retention</p> Signup and view all the answers

    The distal end of the denture should extend into the hamular notches.

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

    What are the primary stress bearing areas for complete dentures?

    <p>Posterior part of the palate and posterolateral part of the residual alveolar ridge.</p> Signup and view all the answers

    The _____ is situated behind the central incisors and is an exit point for nasopalatine nerves and vessels.

    <p>incisive papilla</p> Signup and view all the answers

    Which relief area is NOT associated with complete dentures?

    <p>Gingival margin</p> Signup and view all the answers

    The palatal rugae area is classified as a primary stress-bearing area.

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

    Which structure requires greater clearance on the buccal flange of the denture?

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

    How far should the denture extend posterior to the vibrating line?

    <p>1-2 mm</p> Signup and view all the answers

    Match the following areas with their classification:

    <p>Posterior part of the palate = Primary stress bearing area Palatal rugae area = Secondary stress bearing area Maxillary tuberosity = Secondary stress bearing area Incisive papilla = Relief area</p> Signup and view all the answers

    The labial frenum contains active muscle fibers.

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

    What is the primary purpose of the labial notch in denture design?

    <p>To avoid interference and achieve peripheral seal around the frenum</p> Signup and view all the answers

    The __________ extends from the buccal frenum anteriorly to the hamular notch posteriorly.

    <p>buccal sulcus</p> Signup and view all the answers

    Match the following anatomical landmarks with their descriptions:

    <p>Labial frenum = Fibrous band covered by mucous membrane Buccal vestibule = Bounded by the teeth, gingiva, and lips Hamular notch = One of the limiting structures for dentures Posterior palatal seal area = Area designed for achieving peripheral seal</p> Signup and view all the answers

    What determines the size of the buccal vestibule?

    <p>Contraction of the buccinator muscle</p> Signup and view all the answers

    The labial sulcus divides into compartments left and right by the buccal frenum.

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

    What is the role of the labial and buccal frena in denture design?

    <p>To provide proper fit and movement clearance for the denture</p> Signup and view all the answers

    What is the importance of the retromolar pad in mandibular dentures?

    <p>It forms the posterior seal of the mandibular denture.</p> Signup and view all the answers

    The alveololingual sulcus includes a region that extends from the retromylohyoid curtain to the premylohyoid fossa.

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

    What anatomical landmark provides a valuable undercut area important for retention in dentures?

    <p>Retromylohyoid curtain</p> Signup and view all the answers

    The __________ is a ligamentous band attached to both the pterygoid hamulus and the mylohyoid line of the mandible.

    <p>pterygomandibular raphe</p> Signup and view all the answers

    Match the following regions of the alveololingual sulcus with their descriptions:

    <p>Anterior = From lingual frenum to mylohyoid ridge Middle = From the premylohyoid fossa to distal mylohyoid region Posterior = From the end of the mylohyoid ridge to the retromylohyoid curtain</p> Signup and view all the answers

    Which area is considered a primary stress bearing area for dentures?

    <p>Buccal shelf area</p> Signup and view all the answers

    The mental foramen is located on the internal surface of the mandible in the premolar region.

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

    What anatomical feature serves as an attachment for the mylohyoid muscle?

    <p>Mylohyoid ridge</p> Signup and view all the answers

    The __________ slope is considered a secondary stress bearing area for dentures.

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

    Which of the following is NOT a relief area in dental prosthetics?

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

    Match the following stress bearing areas with their category:

    <p>Buccal shelf area = Primary stress bearing area Residual alveolar ridge = Secondary stress bearing area Lingual slopes = Secondary stress bearing area Mental foramen = Relief area</p> Signup and view all the answers

    The width of the buccal shelf area decreases as the alveolar resorption continues.

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

    Name one landmark that should be relieved to avoid trauma by the denture base.

    <p>Mylohyoid ridge</p> Signup and view all the answers

    Study Notes

    Complete Denture Anatomy

    • The edentulous ridge in the maxilla and mandible are important for designing complete dentures.
    • The objective of a complete denture is to restore lost teeth and their surrounding structures functionally, anatomically, and aesthetically without damaging supporting structures.
    • Edentulous jaw landmarks are classified as limiting structures, supporting structures, and relief areas.

    Limiting Structures Maxilla

    • Labial & Buccal Frenum: Fibrous bands covered by mucous membrane.
      • Labial Frenum: Extends from the labial aspect of the residual ridge to the lip. A passive frenum without active muscle fibers. Requires a v-shaped notch (labial notch) that is narrow but deep enough to avoid interference.
      • Buccal Frenum: Attached to the levator anguli oris, orbicularis oris, and buccinator muscles. Requires greater clearance on the buccal flange (shallower and wider) than the labial frenum.
    • Labial & Buccal Vestibule (Sulcus): The labial sulcus is bounded by teeth, gingiva, the residual alveolar ridge, and the lips. It extends from one side of the buccal frenum to the other, divided into left and right compartments by the labial frenum. The buccal sulcus extends from the buccal frenum anteriorly to the hamular notch posteriorly. Its size depends on the contraction of the buccinator muscle.
    • Posterior Palatal Seal Area (Post-Dam): Aids in retention, prevents food accumulation, compensates for polymerization shrinkage, and reduces gag reflexes by preventing gaps between the denture base and soft palate during movement.
      • The distal end of the denture must cover the tuberosities, extend into the hamular notches, and end 1-2mm posterior to the vibrating line.

    Supporting Structures Maxilla

    • Primary Stress-Bearing Areas: Posterior part of the palate, posterolateral part of the residual alveolar ridge.
    • Secondary Stress-Bearing Areas: Palatal rugae area, maxillary tuberosity.

    Relief Areas Maxilla

    • Incisive Papilla: Midline structure behind the central incisors. Exit point for the nasopalatine nerves and vessels. Requires relief to avoid nerve compression, necrosis in the distribution area, and anterior palate paresthesia.
    • Mid-Palatine Raphe: Extends from the incisive papilla to the distal end of the hard palate. Divided into three parts:
      • Anterior Part: From lingual frenum to the mylohyoid ridge, the shallowest part of the lingual flange.
      • Middle Region: From the premylohyoid fossa to the distal end of the mylohyoid region.
      • Posterior Portion: From the end of the mylohyoid ridge to the retromylohyoid curtain. Provides a valuable undercut area for retention. Overextension causes soreness and instability.

    Limiting Structures Mandible

    • Alveololingual Sulcus:
      • Anterior Part: From the lingual frenum to the mylohyoid ridge (shallowest portion of the lingual flange)
      • Middle Region: From the premylohyoid fossa to the distal end of the mylohyoid region.
      • Posterior Portion: From the end of the mylohyoid ridge to the retromylohyoid curtain.
    • Retromolar Pad: Pear-shaped triangular soft pad of tissue at the distal end of the lower ridge. Forms the posterior seal of the mandibular denture. The denture base should extend to 2/3 of the retromolar pad triangle.
    • Pterygomandibular Raphe: A ligamentous band of the buccopharyngeal fascia attached superiorly to the pterygoid hamulus of the medial pterygoid plate and inferiorly to the posterior end of the mylohyoid line of the mandible.

    Supporting Structures Mandible

    • Primary Stress-Bearing Area: Buccal shelf area
    • Secondary Stress-Bearing Area: Residual alveolar ridge

    Relief Areas Mandible

    • Mylohyoid Ridge: Attachment for the mylohyoid muscle. Lies along the lingual surface of the mandible. Located close to the inferior border of the mandible anteriorly and near the residual ridge posteriorly. Covered by thin mucosa; requires relief to prevent trauma. The lingual flange should extend past the mylohyoid ridge but not into the undercut.
    • Mental Foramen: Lies on the external surface of the mandible between the 1st and 2nd premolar region.
    • Genial Tubercle: A small protuberance located on the lingual aspect of the mandible, above the mylohyoid ridge.
    • Torus Mandibularis: A bony growth on the lingual aspect of the mandible, usually in the premolar region. Requires relief.

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    Anatomy of the Denture Bearing Areas PDF

    Description

    Test your knowledge on complete denture anatomy with this quiz. Learn about the important structures of the edentulous ridge in the maxilla and mandible, as well as the classification of jaw landmarks. Enhance your understanding of designing complete dentures for optimal function and aesthetics.

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