Cusp Fossa Relationship
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Transcript of Cusp Fossa Relationship
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Introduction to Occlusion:Cusp Cryptoprocta ferox
Relationship
Brian B. Nov, DDS
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Cusp Fossa Relationship
Found in only 5% of the population
Idealized occlusion
Full mouth cases Occlusal forces concentrated near the center of
each tooth
Less food impaction Tooth-to-tooth relationship
The concept is easy to teach and learn
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Cusp Fossa Relationship
Functional cusp contacts
opposing tooth at three points
Very stable
Results in minimal tooth wear
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Nov Nugget:
Maxillary Mesial
manDibular Distal
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Terminology
Functional Cusps
Lingual of maxillary teeth
Facial of mandibular teeth
Non-Functional Cusps
Facial of maxillary teeth
Lingual of mandibular teeth
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National Board Terminology
Supporting cusps
Guiding cusps Guiding inclines
Functional Outer Aspect
(FOA)
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Supporting Cusps
The working or functional
cusp
Mandibular facial
Maxillary lingual
Responsible for
supporting the forces
of occlusion
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Guiding Cusps
Non-functional cusps
Mandibular lingual
Maxillary facial
Cusp is not in function
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Guiding Inclines
Inclines of the guiding
cusps from the cusp tip
toward the center of the
tooth Lingual incline of facial
cusp of maxillary teeth
Facial incline of lingual
cusp of mandibular
teeth
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Functional Outer Aspect (FOA)
The outside 1-2 mm of the
supporting cusp which
makes contact with the
guiding inclines of the
guiding cusps of the
opposing dentition when in
occlusion
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Cusp Fossa Relationship
ABC Contacts
Use a sagittal view
A & C contacts Between functional
and non-functional
cusps
B contacts
Between both
functional cusps
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ABC Contacts
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Dr. Nov, why
do we have toknow this?
Because, if you create cusp-fossa
relationships in your restorations, you
create/allow a phenomenon called,DISCLUSION.
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Disclusion
Teeth are arranged such thatthe overlap of the anteriorteeth prevent the posteriorteeth from making anycontact on during working ornon-working excursivemovements.
This protects teeth from beingworn down during normalfunction (aka attrition).
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Laboratory Procedure
Step one:
Determine cusp placement
In line with adjacent cusps Same height as adjacent cusps
Functional cusps in fossa ofopposing tooth
No interferences in excursivemovements
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Laboratory Procedure
Step two: Mark the location of cusps and fossas
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Waxing Procedure
Step three:
Create wax cones
Upper facial cusps Upper lingual cusps
Lower facial cusps
Lower lingual cusps
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Waxing Procedure
Be sure to check
excursive movements
after each step
.or you will wish youhad later on!
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Waxing Procedure
Step four:
Create various ridges
Cusp ridges Marginal ridges
Triangular ridges
Fish mouth concept
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Waxing Procedure
Cusp marginal ridge
placement
Upper ridges
Lower ridges
Thomas notch
Note the Thomas Notches!
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Waxing Procedure
In creating the axial
contour dont forget
that teeth havecorners (line angles
and point angles)
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Waxing Procedure
Triangular ridges
Upper triangular ridges
establish A contact
with lower tooth Lower triangular ridges
establish C contact
with upper tooth
Establish B contact
with opposing B
contact
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Waxing Procedure
Fossas and grooves
Tripodization
Developmental grooves
Supplemental grooves
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Waxing Procedure
Finishing
Careful polishing
Microbrushes work well
in grooves
Light flaming
Re-check contacts with
zinc stearate
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Where are the dots supposed to be?
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Everything should be
made as simpleas possible.
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Everything should be
made as simpleas possible,
but not simpler.-Albert
Einstein
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Peace be with you
d l ith th f