retention and stability. what is retention? it is the ability of the denture to resist vertical...
TRANSCRIPT
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RETENTION AND STABILITY
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WHAT IS RETENTION?• IT IS THE ABILITY OF THE DENTURE TO RESIST
VERTICAL TISSUE AWAY MOVEMENT.
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WHAT IS STABILITY?• IT IS THE QUALITY OF THE DENTURE TO BE FIRM AND
STEADY, WHEN FUNCTIONAL FORCES ARE APPLIED.
(RESISTANCE TO HORIZONTAL AND ROTATIONAL FORCES).
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FACTORS AFFECTING RETENTION.
PHYSICAL.
MECHANICAL.
ANATOMICAL.
RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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1- ADHESION
• PHYSICAL ATTRACTION BETWEEN UNLIKE MOLECULES.(DENTURE-SALIVA-MUCOSA)
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2- COHESION
• PHYSICAL ATTRACTION BETWEEN SIMILAR MOLECULES.(SALIVARY MOLECULES)
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3-INTERFACIAL SURFACE TENSION(CAPILLARY ATTRACTION).
• THE ATTRACTIVE FORCES BETWEEN SURFACE MOLECULES.
• IT IS THE RESISTANCE TO SEPARATION POSSESED BY A FILM OF LIQUID BETWEEN 2 WELL ADAPTED SURFACES.
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4- ATMOSPHERIC PRESSURE
WHEN YOU SEAT THE DENTURE, AIR ESCAPES FROM UNDERNEATH THE FITTING SURFACE,
FORMING A PARTIAL VACCUUM BETWEEN THE MUCOSA AND THE DENTURE, RESULTING IN
TRAPPED REDUCED PRESSURE. ATMOSPHERIC PRESSURE IS LARGER, THUS SEATS THE DENTURE.
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5- VISCOSITY.
• THE RESISTANCE OF PART OF THE FLUID TO MOVE OVER ANOTHER.
THE GREATER THE VICOSITY THE BETTER THE RETENTION.
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6- GRAVITY.
• IS CONSIDERED RETENTIVE TO THE LOWER DENTURE, AND DISPLACING TO THE UPPER
DENTURE.
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ALL THE FACTORS
WORKING TOGETHER.
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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1-SHAPE OF POLISHED SURFACE.
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2-DENTURE FOUNDATION AREA
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3-PRESENCE OF UNDERCUTS
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4- DENTURE EXTENSION
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5- INTIMATE CONTACT
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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1-RIDGE HEIGHT
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2-SOFT PALATE ANATOMY
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3- ARCH RELATIONSHIP
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4- TONGUE SHAPE
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5- VISCOSITY OF SALIVA
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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1- RIDGE AUGMENTATION
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2- VESTIBULOPLASTY
DEEPENING OF THE
VESTIBULE TO GAIN
RIDGE HEIGHT.
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3- DENTAL IMPLANTS
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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1- ADHESIVES
• CREAMS USED AS ADHESIVE IN THE FITTING SURFACE OF THE DENTURE.
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2- MICRO SUCTION DISCS
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3- DENTAL IMPLANTS
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PHYSICAL.
MECHANICAL.
ANATOMICAL.RETENTIVE AIDS.
SURGICAL.
PSYCHOLOGICAL.
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SOME PATIENTS HAVE THE
NEUROMUSCULAR AND PSYCOLOGICAL
ABILITY, TO COPE AND USE THE
DENTURE.
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STABILITY
RETENTION.
BALANCED OCCLUSION.
HEIGHT OF OCCLUSAL PLANE.
POSITION OF POSTERIOR TEETH.
PROPER RELEIF.RIDGE FORM.PALATAL VAULT.WIDTH OF
OCCLUSAL SURFACE.SHAPE AND SIZE OF
THE TONGUE.SHAPE OF THE
POLISHED SURFACE.
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RETENTION.
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FOR A DENTURE TO BE STABLE IT SHOULD BE RETENTIVE FIRST.!!!!!!!
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BALANCED OCCLUSION.
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HEIGHT OF OCCLUSAL
PLANE.
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WHICH IS MORE STABLE!!!!!!!!!!!
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THE FURTHER AWAY THE OCCLUSAL PLANE , FROM THE RIDGE, THE LESS THE STABILITY.
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POSITION OF POSTERIOR TEETH.
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PLACING THE POSTERIOR TEETH SLIGHTLY LINGUAL TO THE CREST OF THE RIDGE, THE MORE STABLE. THE FORCES FALLING ON THE TEETH BECOMES MORE CENTRALISED.THIS IS KNOWN AS
“LEVER BALANCE”.
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INCLINED PLANE ACTION
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PROPER RELEIF.
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FIRST ROCKING THEN
MIDLINE FRACTURE.
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RIDGE FORM.
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PALATAL VAULT.
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V- SHAPED PALATE HELPS RESIST LATERAL LOADS.
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WIDTH OF OCCLUSAL SURFACE.
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THE OCCLUSAL WIDTH IS LESS
THAN THE NATURAL,
THUS DECREASING
THE AMOUNT OF LOAD
FALLING ON THE DENTURE.
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SHAPE AND SIZE OF THE TONGUE.
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LARGE AND MEDIUM SIZED TONGUES HELP STBILIZE THE LOWER
DENTURE.
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SHAPE OF THE POLISHED SURFACE.
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THE CHEEK AND THE TONGUE
SEAT THE DENTURES IN
PLACE.