MAMTA CHETINAD Presentation1
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Transcript of MAMTA CHETINAD Presentation1
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JAW RELATIONSHIP INEDENTULOUS PATIENTS
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INTRODUCTION
In order to ensure comfort and efficiencyfrom a denture it is important to recordcorrect intermaxillary relationship bothvertically and horizontally. Therefore a varietyof techniques have been developed toproduce an accurate record and the
functional technique is most appropriate.
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ANATOMY OF TEMPROMANDIULAR JOINT
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BASIC MANDIBULAR MOVEMENTS
HINGE AXIS MOVEMENT TRANSLATIONALMOVEMENT
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MANDIBULAR POSITIONS
MI- MAXILLARY INTERCUSPATION
CR- CENTRIC RELATION
ECCENTRIC POSITIONS OR MOVEMENTS
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CENTRIC RELATION
The relation of the mandible tothe maxillae when the condyles
are in their most posterosuperior
unstrained positions in the
glenoid fossae, from which lateralmovements can be made at the
occluding vertical relation normal
for the individual. Centric relation
is a relation that can exist at anydegree of jaw separation.
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VERTICAL DIMENSION
The height of the lower third of the face
The distance between the upper and the
lower arches
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TYPES OF VERTICAL DIMENSION
Vertical dimension of
occlusion(OVD)Distance between maxillaand mandible when teethare in MI
Vertical dimension at
rest(RVD)Distance between the maxillaand mandible in physiologicalrest position
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REQUIREMENTS OF COMPLETE DENTURE OCCLUSION
1. Stability of occlusion at centric relation position and in an area forwardand lateral to it.
2. Balanced occlusal contacts bilaterally for all eccentric mandibularmovements
3. Unlocking the cusps mesiodistally to allow for gradual settling of.
4. Control of horizontal force by buccolingual cusp height reduction
according to residual ridge resistance form and interarch distance.5. Functional lever balance by favourable tooth to ridge crest position.
6. Anterior incisal clearance during all posterior masticatory function andbruxing activity.
7. Minimum occlusal contact areas for reduced pressure in communitingfood( lingual contact occlusion).
8. Cuttimg , penetrating, and shearing efficiency of occlusal surfaces.
9. Sharp ridges or cusps and generous sluice ways to shear and shred foodwith the minimum of force necessary.
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UNITS OF COMPLETE DENTURE
OCCLUSION
INCISING UNITS
WORKING OCCLUSAL UNITS, AND
BALANCING OCCLUSAL UNITS
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REQUIREMENTS OF INCISING UNITS
1. These units should be sharp in order to cut efficiently2. They should not contact during mastication.
3. They should have as flat incisal guidance as possible foresthetics and phonetics
4. They should have horizontal overlap to allow for basesetting without interference.
5. They should contact only during protrusive incisingfunction.
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THEORIES OF OCCLUSION
THE BONWILL THEORY OF OCCLUSION
(the theory of equilateral triangle)
THE CONICAL THEORY OF OCCLUSION
THE SPHERICAL THEORY OF OCCLUSION
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RECORDING CENTRIC RELATION