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8/10/2019 Occulsal Morphology Determinants
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INTRODUCTION TO OCCLUSION
CUSP HEIGHT DETERMINANTS
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CUSP HEIGHT
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VERTICAL DETERMINANTS
ANGLE OF EMINENTIA
GRADUAL EMINENTIASLOPE REQUIRES SHORTCUSPS
STEEP EMINENTIA SLOPEPERMITS LONGER CUSPS
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VERTICAL DETERMINATS
VERTICAL OVERLAP (OVERBITE)
DEEP ANTERIOR OVERBITEPERMITS LONGER CUSPS
MINIMUM ANTERIOR OVERBITEREQUIRES SHORTER CUSPS
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VERTICAL DETERMINANTS HORIZONTAL
OVERLAP
(OVERJET) PRONOUNCED ANTERIOR
OVERJET REQUIRES SHORTERCUSPS
MINIMUM ANTERIOR OVERJET
PERMITS LONGER CUSPS
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VERTICAL DETERMINANTS
IMMEDIATE SIDE-SHIFT
EXCESSIVE IMMEDIATE SIDE-SHIFT REQUIRES SHORT CUSPS
GRADUAL IMMEDIATE SIDE-SHIFT PERMITS LONGER CUSPS
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SHORT CUSPS MAY BE INCREASED IN LENGTH BYINCREASING THE EFFECTS OF ANTERIOR GUIDANCE
REDUCING OVERJET
INCREASING OVERBITE
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INCISAL GUIDANCE
Can be increased
Has > influence on cusps
Further from power source
Has > proprioception
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INTRODUCTION TO OCCLUSION
TYPES OF OCCLUSION
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TYPES OF OCCLUSION
BILATERALLY BALANCED
UNILATERALLY BALANCED (GROUP FUNCTION)
MUTUALLY PROTECTED (CANINE GUIDANCE)
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BILATERAL BALANCEDOCCLUSION
USED PRIMARILY IN REMOVABLEPROSTHETICS
A MAXIMUM NUMBER OF TEETH SHOULDCONTACT IN ALL EXCURSIVE MOVEMENTS
USEFULL TO PREVENT TIPPING OFDENTURES
WILL CAUSE EXCESSIVE WEAR TO NATURALTEETH
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Maximal IntercuspationView
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Protrusive View
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Right Working View
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Left Working View
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UNILATERALLY BALANCEDOCCLUSION
Group Function
Elimination of all contacts on the non-
working side More than one tooth on the working side is
in contact during lateral excursions
Distributes the occlusal load ACTIVATES/TRIGGERS MORE MUSCLE FIBERS
(**not a good thing)
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UNILATERAL BALANCED
OCCLUSION/ Group Function
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Anterior Guidance
Canine Guidance aka. Cuspid Rise
Anterior teeth bear all the load in excursivemovements of the mandible.
Posterior teeth are discluded in all excursive
movements
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MUTUALLY PROTECTEDOCCLUSION
Anterior teeth protect the posterior teeth inall excursive movements of the mandible.(Working, Non-working, Protrusive, etc.)
Posterior teeth protect the anterior teeth in
the Maximal Intercuspal Position (MIP)
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MUTALLY PROTECTED
OCCLUSION
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WHY USE ANTERIORGUIDED OCCLUSION?
FORCE IS MORE FAVORABLY PLACED ON TEETH
CLASS THREE LEVER IS THE LEAST EFFICIENT ANDTHUS LESS FORCE PLACED ON THE ANTERIORTEETH
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POSTERIOR VS ANTERIOR
OCCLUSAL FORCE
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LEVER TYPES
CLASS I LEVER SIMILAR TO A CROWBARPOWER FULCRUM WORK
CLASS II LEVER SIMILAR TO A WHEELBARROW
FULCRUM WORK POWER
CLASS III LEVERSIMILAR TO A DRAWBRIDGE
FULCRUM POWER WORK
CONDYLE MUSCLE ANTERIOR TEETH
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Lever Class I: Crowbar
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Lever Class I
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Lever Class I: MostPowerful
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Lever Class II:WheelBarrow
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Lever Class III: Chopsticks
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CRITERIA FOR OPTIMUMOCCLUSION
5 Criteria
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1. Stable contacts are established between theteeth when the condyles are in their mostanterior, superior, middle-most position.(MIP=CR)
2 An anterior g idance that is in harmon
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2. An anterior guidance that is in harmony
with the border movements of the
envelope of function
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3. Disclusion of all posterior teeth in theprotrusive movement
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4. Disclusion of all posterior teeth on the
Non-Working Side
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5. Disclusion of all posterior teeth on the
Working Side
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In Review
Cusp height determinants
Types of Occlusal Schemes
Lever Classifications
Optimal Occlusion Principles