Andrews' Six Keys to Normal Occlusion Lecture 7 Quiz
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Questions and Answers

Which of the following is NOT one of Andrews' six keys to normal occlusion?

  • Correct crown angulation (tip)
  • Flat curve of Spee (0.0 - 2.5 mm) (correct)
  • No rotations
  • Correct crown inclination (torque)

    • What is the key interarch relationship described by Andrews as part of the six keys to normal occlusion?

  • The distal surface of the distal marginal ridge of the upper first permanent molar contacts and occludes with the mesial surface of the mesial marginal ridge of the lower second molar (correct)
  • The mesio-buccal cusp of the upper first permanent molar falls within the groove between the mesial and middle cusps of the lower first permanent molar
  • The mesio-lingual cusp of the upper first molar seats in the central fossa of the lower first
  • Maxillary Canine has a cusp-embrasure relationship with Mandibular Canine & 1st Premolar

    • Which characteristic is NOT identified as one of the six keys to normal occlusion?

  • Correct tooth size
  • Correct interdental spacing (correct)
  • Tight contact points
  • Correct tooth angulation

    • According to Andrews, what should be the range of the flat curve of Spee as a key to normal occlusion?

    <p>0.0 - 2.5 mm</p> Signup and view all the answers

    Which set of teeth should have a cusp-embrasure relationship as per Andrews' six keys to normal occlusion?

    <p>Maxillary Canine and Mandibular Canine &amp; 1st Premolar</p> Signup and view all the answers

    What type of crown inclinations are part of Andrews' six keys to normal occlusion?

    <p>Correct crown inclination (torque)</p> Signup and view all the answers

    What does the term 'Crown angulation (tip)' refer to?

    <p>The angulation of the long axis of the crown, not the entire tooth</p> Signup and view all the answers

    What does a deep curve of Spee result in?

    <p>A more contained area for the upper teeth</p> Signup and view all the answers

    In which direction does the lower jaw's growth sometimes exceed that of the upper jaw?

    <p>Downward and forward</p> Signup and view all the answers

    What is the main function of the Facial Axis of molar crowns?

    <p>Identifying the dominant vertical groove on the buccal surface</p> Signup and view all the answers

    What should be corrected with jackets or crowns, to avoid closing spaces at the expense of good occlusion?

    <p>Serious tooth-size discrepancies</p> Signup and view all the answers

    What is the average inter-incisal crown angle?

    <p>$174^{ ext{o}}$</p> Signup and view all the answers

    What does a rotated molar do in terms of space occupancy?

    <p>Occupies more space than normal</p> Signup and view all the answers

    What does 'Tight Contacts' in dentistry refer to?

    <p>Contact points without spaces between teeth</p> Signup and view all the answers

    'Curve of Spee' ranges from which type of surface to a slight concave surface?

    <p>Flat plane to flat plane</p> Signup and view all the answers

    What causes crowded lower anterior teeth and/or a deeper overbite and deeper curve of Spee?

    <p>Lower jaw's growth downward and forward exceeding that of upper jaw's growth</p> Signup and view all the answers

    Study Notes

    Andrews' Six Keys to Normal Occlusion

    • One of the six keys is not the "Curve of Wilson"
    • The key interarch relationship is the "Cusp-embrasure relationship"
    • The characteristic "Tooth color" is not identified as one of the six keys

    Curve of Spee

    • The range of the flat curve of Spee should be 0.5 to 1.5 mm
    • A deep curve of Spee results in a decreased overbite

    Crown Angulation and Inclination

    • The term "Crown angulation (tip)" refers to the mesial-distal angulation of the crown
    • Andrews' six keys to normal occlusion include crown inclinations of 10-15 degrees for anterior teeth and 15-20 degrees for posterior teeth

    Jaw Growth and Development

    • The lower jaw's growth sometimes exceeds that of the upper jaw in the anterior direction

    Molar Crowns

    • The main function of the Facial Axis of molar crowns is to guide the mandible into a centric relation

    Occlusion and Space Management

    • Inadequate crown contours should be corrected with jackets or crowns to avoid closing spaces at the expense of good occlusion
    • The average inter-incisal crown angle is 130-135 degrees

    Space Occupancy

    • A rotated molar occupies more space than a normal molar

    Tight Contacts

    • "Tight Contacts" in dentistry refer to the tight proximal contacts between teeth

    Curve of Spee Characteristics

    • The Curve of Spee ranges from a flat surface to a slight concave surface

    Causes of Crowded Lower Anterior Teeth

    • Crowded lower anterior teeth and/or a deeper overbite and deeper curve of Spee are caused by excessive growth of the mandible

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