mamta chetinad presentation1

8/3/2019 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

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