6 keys to normal occlusion

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21 Terms

1
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The six keys

  1. Molar relationship

  2. Crown Angulation

  3. Crown Inclination

  4. Rotations

  5. Spaces

  6. Occlusal plane

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Molar relationship

Distal surface of the distobuccal cusp of the upper first permanent molar

occludes with the mesial surface of the mesiobuccal cusp of the lower second molar

<p>occludes with the <strong>mesial</strong> surface of the <strong>mesiobuccal</strong> cusp of the <strong>lower second molar</strong></p>
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Molar relationship

Better opportunity for normal occlusion

The closer the distal surface of the distobuccal cusp of the upper first permanent molar approaches the mesial surfaces of the mesiobuccal cusp of the lower second molar

<p>The closer the <strong>distal</strong> surface of the <strong>distobuccal</strong> cusp of the upper first permanent molar approaches the <strong>mesial</strong> surfaces of the <strong>mesiobuccal</strong> cusp of the lower second molar</p>
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Crown angulation (tip)

Distal than incisal

gingival portion of the long axes of all crowns was more…

5
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<p><strong>Crown angulation (tip)</strong></p><p>Degree of crown tip</p>

Crown angulation (tip)

Degree of crown tip

angle between the long axis of the crown and a line bearing 90 degress from the occlusal plane

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Crown angulation (tip)

Plus reading

gingival portion of the long axis of all crown is distal to the incisal portion

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Crown angulation (tip)

Minus reading

gingival portion of the long axis of the crown is mesial to the incisal portion

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Crown angulation (tip)

Normal occlusion

dependent upon proper distal crown tip, especially of the upper anterior teeth since they have the longest crowns

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Crown angulation (tip)

Degree tip of incisiors

determines the amount of mesiodistal space they consume and, therefore, has a considerable effect on posterior occlusion as well as anterior esthetics.

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<p><strong>Crown inclination</strong></p><p>Plus reading</p>

Crown inclination

Plus reading

the gingival portion of the tangent line (or of the crown) is lingual to the incisal portion

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<p><strong>Crown inclination</strong></p><p>Minus reading</p>

Crown inclination

Minus reading

the gingival portion of the tangent line is labial to the incisal portion

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Crown inclination

Anterior Crown

upper and lower anterior crown inclinations are intricately complementary and significantly affect overbite and posterior occlusion

  • positive upper anterior crown inclination

<p>upper and lower anterior crown inclinations are intricately complementary and significantly affect overbite and posterior occlusion</p><ul><li><p>positive upper anterior crown inclination</p></li></ul><p></p>
13
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Crown inclination

Posterior crown (upper)

minus crown inclination existed in each crown from the upper canine through the upper second premolar

<p><strong>minus</strong> crown inclination existed in each crown from the upper canine through the upper second premolar</p>
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Crown inclination

Posterior Crown (lower)

progressively greater “minus” crown inclination existed from the lower canines through the lower second molars

<p>progressively greater “minus” crown inclination existed from the lower canines through the lower second molars</p>
15
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Tip and torque

Anterior portion of an upper rectangular arch

lingually torqued, a proportional amount of mesial tip of the anterior crowns occurs

<p>lingually torqued, a proportional amount of mesial tip of the anterior crowns occurs </p>
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Rotations

teeth should be free of undesirable rotations

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Tight contacts

contact points should be tight (no spaces)

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Occlusal plane

Planes of occlusion

flat to slight curves of spee

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Occlusal plane

Intercuspation of teeth

best when the plane of occlusion is relatively flat

<p>best when the plane of occlusion is relatively flat</p>
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Occlusal plane

Deep curve of spee

more contained area for the upper teeth, making normal occlusion impossible

<p>more contained area for the upper teeth, making normal occlusion impossible</p>
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Occlusal plane

reverse curve of Spee

extreme form of overtreatment, allowing excessive space for each tooth to be intercuspally placed

<p>extreme form of overtreatment, allowing excessive space for each tooth to be intercuspally placed</p>