Concepts of rpi / dental technician training

concepts of RPI system andconcepts of RPI system and
Indirect retainersIndirect retainers
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com
www.indiandentalacademy.comwww.indiandentalacademy.com

CONTENTSCONTENTS
 IntroductionIntroduction
 IBar philosophyIBar philosophy
RPI systemRPI system
 RPA systemRPA system
 ConclusionConclusion
 BibliographyBibliography

 RESTREST ::
a projection or attachment, usually ona projection or attachment, usually on
the side of anthe side of an
 REST SEATREST SEAT ::
the prepared recess in a tooth orthe prepared recess in a tooth or
restoration created to receive the occlusal,restoration created to receive the occlusal,
incisal, cingulum, or lingual restincisal, cingulum, or lingual rest

CONCEPTS OF RPI SYSTEMCONCEPTS OF RPI SYSTEM

 DISTAL EXTENSION RPDDISTAL EXTENSION RPD
 SUPPORTED BY REMAINING TEETHSUPPORTED BY REMAINING TEETH
AND SOFT TISSUESAND SOFT TISSUES
 FORCES EVENLY DISTRIBUTEDFORCES EVENLY DISTRIBUTED
WITHOUT OVERLOADING TEETH ORWITHOUT OVERLOADING TEETH OR
SOFT TISSUES.SOFT TISSUES.

 INCREASED RISK OF EARLY TOOTHINCREASED RISK OF EARLY TOOTH
LOSS OF ABUTMENTS OF DISTALLOSS OF ABUTMENTS OF DISTAL
EXTENSION CASES.EXTENSION CASES.
 1.OVERLOADING1.OVERLOADING
 2.PERIODONTAL DISEASES.2.PERIODONTAL DISEASES.

 KRATOCHVIL 1963-I BAR PHILOSOPHY.KRATOCHVIL 1963-I BAR PHILOSOPHY.
 THIS CLASP DESIGN MINIMIZEDTHIS CLASP DESIGN MINIMIZED
TORQUING FORCES AND DIRECTEDTORQUING FORCES AND DIRECTED
OCCLUSAL LOADS PARALLEL TO THEOCCLUSAL LOADS PARALLEL TO THE
LONG AXIS OF ABUTMENT.LONG AXIS OF ABUTMENT.

 COMPONENTS:COMPONENTS:
 1.MESIAL REST1.MESIAL REST
 2.I –BAR RETAINER2.I –BAR RETAINER
 3.DISTAL PROXIMAL PLATE.3.DISTAL PROXIMAL PLATE.

 MESIAL REST:MESIAL REST:

 I-BAR RETAINER:I-BAR RETAINER:

 DISTAL PROXIMAL PLATE-LONGDISTAL PROXIMAL PLATE-LONG
DISTAL GUIDING PLANE THATDISTAL GUIDING PLANE THAT
EXTENDS IN TO THE TOOTH TISSUEEXTENDS IN TO THE TOOTH TISSUE
JUNCTION:JUNCTION:

 1.REST:1.REST:
 MESIAL REST.MESIAL REST.
 VERTICAL SUPPORTVERTICAL SUPPORT
 GOOD ADAPTATIONGOOD ADAPTATION
 SUFFICIENT BULKSUFFICIENT BULK

 PREMOLAR-PREMOLAR-
MARGINAL ANDMARGINAL AND
TRIANGULARTRIANGULAR
RIDGESRIDGES
 MOLARS-EXTENDSMOLARS-EXTENDS
TO CENTRALTO CENTRAL
FOSSA.FOSSA.
 ROUNDED,ROUNDED,
 BALL AND SOCKETBALL AND SOCKET
MOVEMENT.MOVEMENT.

 REASONS FOR MESIAL REST:REASONS FOR MESIAL REST:

 GUIDING PLANE.GUIDING PLANE.
 PROXIMAL PLATE-PROXIMAL PLATE-
MARGINAL RIDGE TOMARGINAL RIDGE TO
TOOTH TISSUETOOTH TISSUE
JUNCTION ANDJUNCTION AND
EXTENDS ON TOEXTENDS ON TO
ATTACHED GINGIVAATTACHED GINGIVA
FOR 2MM.FOR 2MM.
 PROXIMAL PLATES:PROXIMAL PLATES:

 HELPS IN:HELPS IN:
 STABILISATION.STABILISATION.
 IMPROVES RETENTIVEIMPROVES RETENTIVE
CHARACTERISTICS-BY LIMITING PATHCHARACTERISTICS-BY LIMITING PATH
OF INSERTION OR REMOVALOF INSERTION OR REMOVAL

 PROTECTS TOOTH TISSUE JUNCTIONPROTECTS TOOTH TISSUE JUNCTION
BY REDUCING FOOD IMPACTION.BY REDUCING FOOD IMPACTION.
 PROVIDES RECIPROCATION DURINGPROVIDES RECIPROCATION DURING
INSERTION AND REMOVAL.INSERTION AND REMOVAL.
 DISTRIBUTES OCCLUSAL FORCESDISTRIBUTES OCCLUSAL FORCES
THROUGH OUT THE ARCH.THROUGH OUT THE ARCH.

 LONG ANDLONG AND
TAPERINGTAPERING
 HALF ROUNDHALF ROUND
 0.010 inch0.010 inch
UNDERCUT.UNDERCUT.
 I-BAR RETENTIVEI-BAR RETENTIVE
ELEMENT:ELEMENT:

 HEIGHT OF MESIOHEIGHT OF MESIO
DISTAL CONTOURDISTAL CONTOUR
OR MESIAL TO IT.OR MESIAL TO IT.
4MM

 ADVANTAGES:ADVANTAGES:
 FOOD ACCUMULATION MINIMIZEDFOOD ACCUMULATION MINIMIZED
 APPROACH ARM DOES NOT CONTACTAPPROACH ARM DOES NOT CONTACT
ABUTMENT TEETH SO LATERALABUTMENT TEETH SO LATERAL
FORCERS ARE MINIMIZED.FORCERS ARE MINIMIZED.

 DISADVANTAGES:DISADVANTAGES:
 LESS HORIZONTAL STABILIZATIONLESS HORIZONTAL STABILIZATION
 LESS RETENTION.LESS RETENTION.

 DESIGN VARIATIONS:DESIGN VARIATIONS:

 RPI SYSTEM:RPI SYSTEM:
 KROLKROL
 OPPOSED EXTENSIVE TOOTHOPPOSED EXTENSIVE TOOTH
PREPARATIONPREPARATION

 LAID EMPHASIS ON STRESS CONTROLLAID EMPHASIS ON STRESS CONTROL
AND MINIMAL HARD AND SOFT TISSUEAND MINIMAL HARD AND SOFT TISSUE
COVERAGE.COVERAGE.
 CONCEPT INTENDED TO MINIMIZECONCEPT INTENDED TO MINIMIZE
PLAQUE ACCUMULATION.PLAQUE ACCUMULATION.

 REST:REST:

PROXIMAL PLATE:PROXIMAL PLATE:
 GUIDING PLANE-GUIDING PLANE-
MARGINAL RIDGEMARGINAL RIDGE
TO JUNCTION OFTO JUNCTION OF
MIDDLE ANDMIDDLE AND
GINGIVAL THIRD.(2-GINGIVAL THIRD.(2-
3MM)3MM)
 RELEIF AT TOOTHRELEIF AT TOOTH
TISSUE JUNCTION.TISSUE JUNCTION.

 PROXIMAL PLATEPROXIMAL PLATE
+MINOR+MINOR
CONNECTOR-CONNECTOR-
STRABILIZATIONSTRABILIZATION
AND RECIPROCALAND RECIPROCAL
ACTION.ACTION.
 MINOR CONNECTOR:MINOR CONNECTOR:

 IBAR+REST+PROXIMIBAR+REST+PROXIM
ALAL
PLATE=STABILIZATIOPLATE=STABILIZATIO
N THROUGHN THROUGH
ENCIRCLEMENT.ENCIRCLEMENT.
 I BAR:I BAR:

I ApproachI Approach

II ApproachII Approach

III ApproachIII Approach

RPA SYSTEMRPA SYSTEM

 BibliographyBibliography
 1.MC CRACKEN’S REMOVABLE PARTIAL1.MC CRACKEN’S REMOVABLE PARTIAL
PROSTHODONTICSPROSTHODONTICS
11TH EDITION.11TH EDITION.
 2.STEWART’S CLINICAL REMOVABLE PARTIAL2.STEWART’S CLINICAL REMOVABLE PARTIAL
PROSTHODONTICSPROSTHODONTICS
3RD EDITION.3RD EDITION.
 3.REMOVABLE DENTURE PROSTHODONTICS –A.A3.REMOVABLE DENTURE PROSTHODONTICS –A.A
GRANT /W.JOHNSON 2ND EDITION.GRANT /W.JOHNSON 2ND EDITION.
 4.A COLOUR ATLAS OF REMOVABLE PARTIAL DENTURES4.A COLOUR ATLAS OF REMOVABLE PARTIAL DENTURES
J.C.DAVENPORT,R.M.BASKERJ.C.DAVENPORT,R.M.BASKER
 5.REMOVABLE PARTIAL PROSTHODONTICS-DR SYBILLE5.REMOVABLE PARTIAL PROSTHODONTICS-DR SYBILLE
K LECHNER,PROFESSOR A ROY MAC GREGOR.K LECHNER,PROFESSOR A ROY MAC GREGOR.

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