Occlusion in FPD and IMPLANTS
Occlusion in FPD and IMPLANTS
Occlusion in FPD and IMPLANTS
FPD AND
IMPLANTS
SUBIYA
Introduction
Significance of occlusion
Terminologies
History of study of occlusion
Concepts of occlusion
CONTENT Criteria for optimum functional occlusion
S Determinants of occlusion
Occlusal adjustments
Implant Protective Occlusion
Recommended occlusion for different types of prosthesis
Conclusion
References
Introduction
• Dynamic occlusion :
“The dynamic occlusion refers to the occlusal contacts that are made whilst the mandible is
moving relative to the maxilla”
• Malocclusion :
“Any deviation from a physiologically acceptable contact between the opposing dental arches”
Or
“Any deviation from a normal occlusion”
• Pathogenic Occlusion :
“An occlusal relationship capable of producing pathologic changes in the stomatognathic
system”
History
• Gnathology
1926
Gnathology Functionalism
• Mc Collum & colleagues 1926 • Schuyler 1929
• Study of TMJ movements, their selective • Arrangements of teeth will provide the
measurements, reproduction and their use highest efficiency during all the excursions
as determinants in the diagnosis and of the mandible which are necessary to the
treatment of occlusion function of mastication
Concepts Of Occlusion
Concepts of Occlusion
Anterior protected
Not used in FPD
articulation
Canine protected
articulation
Bilaterall
y
Balanced
Occlusion
Based on the work of Von Spee &
Monson
Advantages Disadvantages
Useful in complete dentures It is not a healthy occlusion
There is cross arch and cross tooth contacts Does not normally occur
Neuromuscular disturbances
Maintains occlusion
Mutually Protected Occlusion
“An occlusal scheme in which the posterior teeth prevent excessive contact of the anterior teeth in
maximum intercuspation, and the anterior teeth disengage the posterior teeth in all mandibular
excursive movements. Alternatively, an occlusal scheme in which the anterior teeth disengage the
posterior teeth in all mandibular excursive movements, and the posterior teeth prevent excessive
contact of the anterior teeth in maximum intercuspation”
Anterior Protected Articulation
• ORGANIC OCCLUSION
• According to GPT 9 : “A form of mutually
protected articulation in which the vertical and
horizontal overlap of the anterior teeth
disengages the posterior teeth in all
mandibular excursive movements”
Canine Protected Occlusion
• CANINE GUIDED OCCLUSION
• According to GPT 9 :
“A form of mutually protected articulation in
which the vertical and horizontal overlap of the
canine teeth disengage the posterior teeth in the
excursive movements of the mandible”
Anatomical Evidence In Support Of Canine
Guided Occlusion :
1. Closure Stoppers
2. Equalizers
Criteria For Optimum Functional Occlusion
• Amount
• Direction
• Timing
Effect of the Amount of Lateral Translation
Movement on Cusp Height :
Effect of the Direction of the Lateral Translation
Movement on
Cusp Height :
Effect of the Timing of the Lateral Translation
Movement on
Cusp Height :
Horizontal Determinants Of Occlusal
Morphology
• Influence the direction of ridges and grooves
on the occlusal surfaces and the placement of
cusps
• Each centric cusp tip generates
--Mediotrusive pathway
-- Laterotrusive pathway
Effect Of Distance From The Rotating Condyle On
Ridge
And Groove Direction :
Effect Of Distance From The Midsagittal Plane On
Ridge
And Groove Direction :
Effect Of Mandibular Lateral Translation
Movement On
Ridge And Groove Direction :
• Occlusal adjustment refers to selective recontouring and
grinding of teeth in order to remove prematurities
• Indications:
1. Evidence of trauma from occlusion, by changes in
Occlusal the periodontium
Correction of
Correction of Correction of Correction of
Centric Relation
Protrusive Non-Working Working
Occlusal
Interferences Interferences Interferences
Interferences
Sequence of Occlusal Adjustment :
Grinding rule –
‘DUML’ : grind distal inclines of
upper or mesial incline of lower
teeth
Sequence of Occlusal Adjustment :
Grinding rule --
‘BULL’ : grind the buccal inclines of upper
or lingual inclines of lower
Sequence of Occlusal Adjustment :
Grinding rule –
‘MUDL’ : Grind the mesial inclines of upper
teeth or distal inclines of lower teeth
Implant protective occlusion
• Misch,1993
• Occlusal load transferred within physiologic limit
• Specifically for restoration of endosteal implants
• Provides an environment for improved clinical longevity of implants and
prosthesis
Concept
No premature occlusal contacts or interferences
Occlusal materials
Hobo S, classified osseointegrated prosthesis as
follows
Recommende • Fully bone anchored bridge
d occlusion • Free standing bridge
for different • Kennedy Class I
types of • Kennedy Class II
• Kennedy Class III
osseointegrat • Kennedy Class IV
ed prosthesis • Bridge connected to natural teeth
• Single tooth replacement
OCCLUSION FOR FULLY BONE ANCHORED
PROSTHESIS
• In centric
• Posterior osseointegrated bridge and
anterior teeth - 30 µm open contacts
• Strong bite pressure – Contact begins
• The amount of disclusion suggested is the
same as for natural dentition.
Free standing bridge
(Kennedy Class IV)