Concepts of rpi / dental technician training

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Concepts of rpi / dental technician training

  1. 1. 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
  2. 2. CONTENTSCONTENTS  IntroductionIntroduction  IBar philosophyIBar philosophy RPI systemRPI system  RPA systemRPA system  ConclusionConclusion  BibliographyBibliography www.indiandentalacademy.comwww.indiandentalacademy.com
  3. 3.  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 www.indiandentalacademy.comwww.indiandentalacademy.com
  4. 4. CONCEPTS OF RPI SYSTEMCONCEPTS OF RPI SYSTEM www.indiandentalacademy.comwww.indiandentalacademy.com
  5. 5.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  6. 6.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  7. 7.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  8. 8.  COMPONENTS:COMPONENTS:  1.MESIAL REST1.MESIAL REST  2.I –BAR RETAINER2.I –BAR RETAINER  3.DISTAL PROXIMAL PLATE.3.DISTAL PROXIMAL PLATE. www.indiandentalacademy.comwww.indiandentalacademy.com
  9. 9.  MESIAL REST:MESIAL REST: www.indiandentalacademy.comwww.indiandentalacademy.com
  10. 10.  I-BAR RETAINER:I-BAR RETAINER: www.indiandentalacademy.comwww.indiandentalacademy.com
  11. 11.  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: www.indiandentalacademy.comwww.indiandentalacademy.com
  12. 12.  COMPONENTS:COMPONENTS:  1.REST:1.REST:  MESIAL REST.MESIAL REST.  VERTICAL SUPPORTVERTICAL SUPPORT  GOOD ADAPTATIONGOOD ADAPTATION  SUFFICIENT BULKSUFFICIENT BULK www.indiandentalacademy.comwww.indiandentalacademy.com
  13. 13. www.indiandentalacademy.comwww.indiandentalacademy.com
  14. 14.  PREMOLAR-PREMOLAR- MARGINAL ANDMARGINAL AND TRIANGULARTRIANGULAR RIDGESRIDGES  MOLARS-EXTENDSMOLARS-EXTENDS TO CENTRALTO CENTRAL FOSSA.FOSSA.  ROUNDED,ROUNDED,  BALL AND SOCKETBALL AND SOCKET MOVEMENT.MOVEMENT. www.indiandentalacademy.comwww.indiandentalacademy.com
  15. 15.  REASONS FOR MESIAL REST:REASONS FOR MESIAL REST: www.indiandentalacademy.comwww.indiandentalacademy.com
  16. 16. www.indiandentalacademy.comwww.indiandentalacademy.com
  17. 17.  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: www.indiandentalacademy.comwww.indiandentalacademy.com
  18. 18.  HELPS IN:HELPS IN:  STABILISATION.STABILISATION.  IMPROVES RETENTIVEIMPROVES RETENTIVE CHARACTERISTICS-BY LIMITING PATHCHARACTERISTICS-BY LIMITING PATH OF INSERTION OR REMOVALOF INSERTION OR REMOVAL www.indiandentalacademy.comwww.indiandentalacademy.com
  19. 19.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  20. 20.  LONG ANDLONG AND TAPERINGTAPERING  HALF ROUNDHALF ROUND  0.010 inch0.010 inch UNDERCUT.UNDERCUT.  I-BAR RETENTIVEI-BAR RETENTIVE ELEMENT:ELEMENT: www.indiandentalacademy.comwww.indiandentalacademy.com
  21. 21.  HEIGHT OF MESIOHEIGHT OF MESIO DISTAL CONTOURDISTAL CONTOUR OR MESIAL TO IT.OR MESIAL TO IT. 4MM www.indiandentalacademy.comwww.indiandentalacademy.com
  22. 22.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  23. 23.  DISADVANTAGES:DISADVANTAGES:  LESS HORIZONTAL STABILIZATIONLESS HORIZONTAL STABILIZATION  LESS RETENTION.LESS RETENTION. www.indiandentalacademy.comwww.indiandentalacademy.com
  24. 24.  DESIGN VARIATIONS:DESIGN VARIATIONS: www.indiandentalacademy.comwww.indiandentalacademy.com
  25. 25.  RPI SYSTEM:RPI SYSTEM:  KROLKROL  OPPOSED EXTENSIVE TOOTHOPPOSED EXTENSIVE TOOTH PREPARATIONPREPARATION www.indiandentalacademy.comwww.indiandentalacademy.com
  26. 26.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  27. 27.  COMPONENTS:COMPONENTS: www.indiandentalacademy.comwww.indiandentalacademy.com
  28. 28.  REST:REST: www.indiandentalacademy.comwww.indiandentalacademy.com
  29. 29. 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. www.indiandentalacademy.comwww.indiandentalacademy.com
  30. 30. www.indiandentalacademy.comwww.indiandentalacademy.com
  31. 31.  PROXIMAL PLATEPROXIMAL PLATE +MINOR+MINOR CONNECTOR-CONNECTOR- STRABILIZATIONSTRABILIZATION AND RECIPROCALAND RECIPROCAL ACTION.ACTION.  MINOR CONNECTOR:MINOR CONNECTOR: www.indiandentalacademy.comwww.indiandentalacademy.com
  32. 32.  IBAR+REST+PROXIMIBAR+REST+PROXIM ALAL PLATE=STABILIZATIOPLATE=STABILIZATIO N THROUGHN THROUGH ENCIRCLEMENT.ENCIRCLEMENT.  I BAR:I BAR: www.indiandentalacademy.comwww.indiandentalacademy.com
  33. 33. I ApproachI Approach www.indiandentalacademy.comwww.indiandentalacademy.com
  34. 34. II ApproachII Approach www.indiandentalacademy.comwww.indiandentalacademy.com
  35. 35. III ApproachIII Approach www.indiandentalacademy.comwww.indiandentalacademy.com
  36. 36. RPA SYSTEMRPA SYSTEM www.indiandentalacademy.comwww.indiandentalacademy.com
  37. 37.  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. www.indiandentalacademy.comwww.indiandentalacademy.com
  38. 38. For more details please visit www.indiandentalacademy.com www.indiandentalacademy.comwww.indiandentalacademy.com

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