Dental Impression Techniques
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Dental Impression Techniques

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Questions and Answers

What is the recommended storage position for a cast after pouring?

  • Tray side down (correct)
  • Flat on a dry surface
  • Open side up
  • Inclined at a 45-degree angle

    • Which of the following factors is NOT evaluated during the quality check of a diagnostic cast?

  • Voids and nodules
  • Proper articulation
  • Color consistency (correct)
  • Surface detail

    • What device is used to achieve accurate spatial orientation of the maxillary cast?

  • Centric relation interocclusal record
  • Articulator
  • Facebow (correct)
  • Protrusive record

    • Which of the following techniques is used to analyze occlusal contacts throughout mandibular movements?

    <p>Evaluating anterior guidance</p> Signup and view all the answers

    When should casts be separated after pouring for optimal outcomes?

    <p>One hour after pouring</p> Signup and view all the answers

    What does maximum intercuspation (MI) refer to in occlusal relationships?

    <p>The position of the jaws when the cusps interdigitate maximally</p> Signup and view all the answers

    During cast evaluation, which condition indicates a potential need for rejection?

    <p>Voids or nodules present</p> Signup and view all the answers

    Which record is essential for mandibular cast articulation within an articulator?

    <p>Centric relation record</p> Signup and view all the answers

    What is a key characteristic of a small nonadjustable articulator?

    <p>Leads to restorations with occlusal interferences</p> Signup and view all the answers

    Which articulator design is considered anatomically 'correct'?

    <p>Arcon design</p> Signup and view all the answers

    What is an advantage of using semiadjustable articulators?

    <p>They reduce the need for clinical adjustments and are time-efficient</p> Signup and view all the answers

    What does the progressive side shift in a semiadjustable articulator simulate?

    <p>Lateral movement of the mandible</p> Signup and view all the answers

    Which feature distinguishes nonarcon articulators from arcon ones?

    <p>Their upper and lower members are rigidly attached</p> Signup and view all the answers

    What is a critical purpose of interocclusal records in dental prosthetics?

    <p>To transfer the relationship between upper and lower dental arches to the articulator</p> Signup and view all the answers

    In which scenario would small nonadjustable articulators likely lead to issues?

    <p>When conducting detailed analysis of occlusal relationships</p> Signup and view all the answers

    What adjustment does the immediate side shift replicate in a semiadjustable articulator?

    <p>The initial lateral movement of the condyle</p> Signup and view all the answers

    What is a key purpose of diagnostic casts in fixed prosthodontics?

    <p>To facilitate comprehensive examination of tooth relationships</p> Signup and view all the answers

    When evaluating occlusocervical dimension in edentulous spaces, what is primarily assessed?

    <p>The height from the occlusal plane to the crest of the ridge</p> Signup and view all the answers

    Which of the following is NOT a factor to consider when assessing abutment teeth?

    <p>Surface color of the teeth</p> Signup and view all the answers

    What aspect does occlusal analysis primarily focus on?

    <p>Identifying potential interferences in occlusion</p> Signup and view all the answers

    In diagnostic wax-up procedures, what is the main benefit?

    <p>To visualize and evaluate proposed treatment outcomes</p> Signup and view all the answers

    Which principle is essential when considering anterior guidance?

    <p>Establishing a harmonious occlusal relationship</p> Signup and view all the answers

    What is the significance of spatial relationships in diagnostic casts?

    <p>They help assess interactions with adjacent and opposing teeth</p> Signup and view all the answers

    When selecting an articulator, which factor is most important?

    <p>Its ability to mimic the patient's dynamic occlusal relationships</p> Signup and view all the answers

    Study Notes

    Material Application

    • Load tray and wipe material into occlusal crevices.

    Tray Seating

    • Insert tray and remind patient to relax cheek muscles.

    Removal

    • Remove quickly 2-3 minutes after gelation.

    Evaluating Alginate Impression

    • Smooth surface
    • Rounded periphery
    • No oral cavity debris

    Disinfection

    • Spray with glutaraldehyde
    • Place in a sealed bag for 10 minutes

    Timing

    • Pour within 15 minutes of removal for accuracy

    Stone Selection

    • Use vacuum-mixed ADA type IV or V stone.

    Cast Storage and Separation

    • Storage Position: Tray side down
    • Environment: Covered with wet paper in humidor
    • Duration: 1 hour
    • Separation Time: 1 hour after pouring

    Diagnostic Cast Quality Evaluation

    • Accuracy Check
      • Examine for voids, nodules, and proper articulation.
    • Surface Detail
      • Ensure adequate reproduction of dental structures.

    Repeat if Necessary

    • Discard questionable impressions and casts.
    • Repeat the process.

    Transferring Casts to Articulators

    • Use a facebow to transfer the maxillary cast
    • This ensures accurate spatial orientation.

    Centric Relation Record

    • Utilize a centric relation interocclusal record for mandibular cast articulation

    Condylar Element Setting

    • Set condylar elements using protrusive and excursive interocclusal records.

    Analyzing Occlusal Relationships

    • Centric Relation
      • The position of the mandible in relation to the maxilla where the condyles are in their most upward, backward, and unstrained position within the glenoid fossae.
    • Maximum Intercuspation
      • The occlusal relationship where the cusps of the upper and lower teeth interdigitate maximally when the jaws are closed in their habitual position.
    • Mandibular Movements
      • Analyze occlusal contacts throughout the range of mandibular movements.

    Occlusal Plane Analysis

    • Anterior Guidance
      • Evaluate anterior guidance and its influence on posterior disclusion.
    • Group Function
      • Its an occlusal arrangement where multiple posterior teeth on the working side (the side towards which the jaw moves during lateral excursion) come into contact simultaneously during lateral jaw movements.

    Articulator Selection for Dental Prostheses

    • Articulators are mechanical devices that simulate mandibular movement.
    • They are crucial for analyzing functional relationships in dental prosthetics.
    • Proper articulator selection can significantly impact treatment outcomes and efficiency.

    Types of Articulators

    • Small Nonadjustable
      • Limited capacity to reproduce mandibular movement.
      • Can lead to occlusal discrepancies.
    • Semiadjustable
      • Practical for routine fixed prostheses.
      • Provides necessary diagnostic information with minimal adjustments.
    • Fully Adjustable
      • Wide range of positions.
      • Can follow patient's border movements accurately.

    Small Nonadjustable Articulators

    • Limited Accuracy
      • Cannot reproduce full range of mandibular movement.
    • Occlusal Discrepancies
      • May lead to restorations with occlusal interferences.
    • Hinge Closure Issues
      • Distance between hinge and tooth is less than in patients.

    Semiadjustable Articulators

    • Practical Approach
      • Suitable for most routine fixed prostheses.
    • Minimal Adjustments
      • Reduces need for clinical adjustments during treatment.
    • Anatomical Accuracy
      • Size similar to anatomic structures they represent.
    • Time-Efficient
      • Does not require excessive time or expertise to use.

    Arcon vs Nonarcon Designs

    • Arcon Design
      • Condylar spheres on lower component.
      • Anatomically "correct" design.
    • Nonarcon Design
      • Popular in complete denture prosthodontics.
      • Rigidly attached upper and lower members.
    • Movement Simulation
      • Arcon easier to understand.
      • Nonarcon movements are "backwards".

    Semiadjustable Articulator Adjustments

    • Condylar Inclination
      • Adjusts to mimic patient's condylar path.
    • Progressive Side Shift
      • Simulates lateral movement of the mandible.
    • Immediate Side Shift
      • Replicates initial lateral movement of the condyle.

    Interocclusal Records

    • To transform the relation between the upper & lower dental arch from the patient mouth to the articulator.

    Diagnostic Casts

    • A dental diagnostic cast, also known as a study model or diagnostic model, is a three-dimensional replica of a patient's teeth and surrounding oral structures. It is made from a dental impression using materials like dental stone or plaster.

    Diagnostic Casts in Fixed Prosthodontics

    • Diagnostic casts are crucial in fixed prosthodontic treatment planning.
    • They allow for comprehensive examination of static and dynamic tooth relationships.
    • These casts provide insights not easily observable intraorally
    • They are essential for accurate diagnosis and treatment planning.

    Evaluating Edentulous Spaces

    • Occlusocervical Dimension
      • Measure the occlusocervical dimension of edentulous spaces.
      • This is crucial for prosthesis planning.
    • Spatial Relationships
      • Assess spatial relationships with adjacent and opposing teeth.
      • Consider implications for prosthesis design
    • Soft Tissue Contours
      • Evaluate soft tissue contours in edentulous areas.
      • This affects emergence profile planning.

    Assessing Abutment Teeth

    • Alignment
      • Evaluate the relative alignment of proposed abutment teeth.
      • Consider impact on prosthesis design.
    • Angulation
      • Assess angulation of abutment teeth.
      • This affects path of insertion and retention.
    • Tooth Position
      • Analyze subtle changes in individual tooth position.
      • Note any drifting or rotation.
    • Structural Integrity
      • Examine structural integrity of abutment teeth.
      • Consider need for additional restorative work.

    Diagnostic Procedures

    • Tooth Preparation Simulation
      • Practice tooth preparations on duplicate casts.
      • Refine techniques before intraoral procedure.
    • Diagnostic Wax-up
      • Perform diagnostic wax-up procedures.
      • Visualize and evaluate proposed treatment outcomes.
    • Occlusal Analysis
      • Conduct detailed occlusal analysis.
      • Identify potential interferences and harmonize occlusion.

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    Related Documents

    Diagnostic Casts and Related Procedures PDF

    Description

    This quiz covers the essential techniques and best practices for making high-quality dental impressions. It includes steps for material application, tray seating, impression evaluation, and disinfection, ensuring the accuracy and quality of diagnostic casts. Test your knowledge on handling the alginate impression process and quality evaluation.

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