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Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
Failure in removable part denture my ppt
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Failure in removable part denture my ppt

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  • Good technique pays of. It is a saying tht has not only to be hanged on the wall but also praticed in day yo day life.The failures in removale partial denture can occur at anytime during the course of the fabrication.hence both the dentist as well as the technician have to be carefull in planning and executing a successful partial denture
  • The guiding planes are formed so as to faciliate the easy removal and insertion of the prosthesisThe guiding planes has to be maxium 2-4mm in hegthIf the guiding planes are not fabricated properly then the path of inserton and removal will be hamperedThe guiding planes also help in stablizing the abutments against lateral destructive forces
  • A flexibile major connector will cause damage to both the hard and soft tissue.It will also cause force concentration on a indivuila toothLead to ridge resoprtionThe major connector has to be kept free from the gingival margins 6mm in the maxilliary3mm in the mandibular
  • Transcript

    • 1. GOODMORNING
    • 2. DR ZARIR
    • 3. CONTENTS1. Introduction2. Failures in diagnosis and treatment planning3. Failures in mouth preparation4. Failures in framework design5. Failures in laboratory procedures6. Failure in support for denture bases7. Failures in occlusion8. Failure in patient-dentist relationship9. Conclusion10. Bibliography
    • 4. Failure of removable partial dentures is due toinadequate1. Diagnosis and treatment planning2. Mouth preparation procedures3. Design of framework4. Laboratory procedures5. Support for denture bases6. Occlusion7. Patient-dentist relationshipRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 5. Making RPD’s using a 2 appointment system: one for diagnosisdefinitive impressions, mouth preparation procedures andsecond for insertion of partial denture.FAILURE IN DIAGNOSIS AND TREATMENTPLANNINGA.ERROR:-1. IMPROPER DIAGNOSISRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 6. SOLUTION:-1ST appointment:- make an assessment of the patient,diagnosis, take radiographs and make primary impression2nd appointment:- make mouth preparations and impressionsfor definitive casts and jaw relation can also re carried out.3rd appointment:- try in of the metal frameworkprosthesis.4th appointment to deliver the denture and adjust the occlusion.Give the patient instructions essential to successful function andmaintenance of the denture5th mandatory follow upRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 7. Failure to a the analyze set ofdiagnostic casts for each patient.B.ERROR:-SOLUTION:-1.After only an intraoral examination, a patientmay appear to have a simple problem when, infact, the situation is very complicated.2. Always make diagnostic casts and evaluate themthoroughly before committing to treatmentRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 8. C. ERROR:-Failing to remove debris and plaque from the teeth beforeimpression is madeRoutinely clean the teethwith a lubricatingprophylactic paste beforemaking an impression,In cases of extensive calculusdeposition oral prophylaxishas to be carried outSOLUTION:-Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 9. 2) SurveyingFailure to use a surveyor duringtreatment planningSOLUTIONIt is the responsibility of thedentist to survey and draw thedesign on the diagnostic castbefore sending it to the labRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 10. FAILURES IN MOUTH PREPARATION PROCEDURES1) Improper guide plane preparations:Stewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 11. 2) Improper height of contour: Improper positioning of theretentive clasp arm andreciprocal clasp arm Retention and Stability ofthe prosthesis affected.
    • 12. 3) Rest and Rest SeatPreparation:Movement of theabutment tooth or slidingof the prosthesisThe forces transmittedfrom the prosthesis toabutment teeth wouldoccur against the inclinedplane.Stewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 13.  Occlusal rest Preparation in a multi-surface Amalgam Restoration.-Amalgam tends to flow when placedunder constant pressure or even excesspreparation.
    • 14. ERROR:-SOLUTION:-Dentist failing to tripod thedesigned diagnostic castWhen the dentist designs the castit has to be tripoded so that the labtechnician can easily duplicate thedesign.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261FAILURES IN DESIGN OF FRAMEWORK1.Tripoding
    • 15. 2. Design transfer to master cast:1. The design has to be outlined on therefractory cast with minimum pressure.2. The cast must not be abradedduring the transfer of the design3. The position of individual clasptips is most important in thedesign transferStewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 16. 3) Incorrectly locatedRPD components: Incorrectly locatedmajor connectorStewart’s Clinical Removable Partial Prosthodontics. 4th edition1. Flexible major connector2. Impinging on thegingival margins3. Failure to provide relief whereis crosses the gingival margins
    • 17.  Incorrect use of claspdesignsUse of clasps that are toobroad in tooth coverage andhave too little considerationfor esthetics
    • 18. 4) Beading of the cast: Tissue blanching andinflammation orulceration seen when thebeading on the cast donetoo deepStewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 19. 5) Block out: Improper seatingof the framework:--Block out if not doneproperly permittingrigid part of theframework to beplaced in undercuts.Stewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 20.  Framework that doesnot contact thetooth:-Block out wax addedabove the height ofcontour line or on theguiding planes and notremoved during shapingof wax.Stewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 21. 6) Contouring of the block out wax:1. Done with blockout instrument properly positioned,excess wax is carefully removed.2. The blockout instruments can be electrically heatedor warmed over a flameStewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 22. 7) Relief:.Stewart’s Clinical Removable Partial Prosthodontics. 4th editionERROR:- Metal framework impinges onthe soft tissueSOLUTION:-1. The thickness of the relief wax has to beadequate2. The wax must not be separated andlifted up from the cast during duplication.
    • 23. 1) Poor cast-formingprocedures:Cast is inaccurate: not a truereproduction of the anatomy of themouth.
    • 24. 2) Duplication:1. Block out and relief waxmelted by reversiblehydrocolloid.2. Mold damaged duringremoval of the mastercast.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 25. 3) Refractory cast:ERROR: Abraded refractorycastSOLUTION:-1.Surface treatmentof the cast has to be carried out.2. The cast must not be retrieveduntil it is completely set.3. The refractory cast is thentrimmed on a dry cast trimmer.Stewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 26. 4) Waxing:ERRORS:- patterns separate fromthe refractory cast.SOLUTION:-1. The plastic patterns have to beglued properly to the designoutline on the refractory cast2. Mixture of acetone and plasticpattern scraps mixed to wateryconsistency ( TACKY LIQUID)3. The liquid has to be applied in avery thin layerStewart’s Clinical Removable Partial Prosthodontics. 4th edition
    • 27. 5) Failure of technician tofollow the design andwritten instructions:Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part I.J Prosthet dent; 2001;86(3); 251-261
    • 28. 6) SpruingERROR:-1. Attaching the sprue lead to athin section of waxed frameworkSOLUTION:- Alwayssprue to the bulkiest portionof the patternRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 29. Small particles of investment in the casting:--Sprue leads joined to main sprue on waxpattern improperly.-Sprue hole was enlarged by cutting withknife, leaving roughened surface for metalto flow over.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 30.  Metal spilled when casting:--Sprue hole is too small for Bulk of metal.-Sprue leads broken during investingprocedureRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIJ Prosthet dent; 2001;86(3); 251-261
    • 31.  Internal mold deformations:--Constriction in the sprue lead Porosity in casting:--Improper spruing procedure Pattern failed to casting:--Pattern separated from crucible former duringinvestmentRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 32. 7) Investing:If the cast is dried with teeth up,white materials would bedeposited around the teeth. This isdue to deposition of salts whichform a positive layer that cannotbe removed without scraping anddamaging the cast. Cracks in the castRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part III.J Prosthet dent; 2001;86(3); 251-261
    • 33. 8) CASTING defects:- Pitted castingIf the design is placed on the refractory cast with agraphite pencil….Contaminates…..Burn out temperature…..Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 34.  Metal nodules and rough area on castframework-Failing to use surface tension reducer correctlyon the waxed patterns would cause air trap, whenpaint on investment flows-If the surface tension, reducer is not allowed to drybefore applying the paint on investmentRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 35.  Incomplete casting and rough areas or finsin casting-W: P ratio.-If paint on investment layer is too thin.-If the paint on layer is too thick.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 36.  Porous cast frameworkIf the mold moves in thecasting machine as thecasting arm starts to spin,molten metal sometimesmay miss the sprue holeand spill outside the mold.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 37.  Incomplete casting1. If the sprue hole facesupward during burn out.2. Casting temperatureof metal….Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part II.J Prosthet dent; 2001;86(3); 251-261
    • 38.  Warpage of theFrame work1.The air pressure of thenozzle of air abrasionmachine is about 100 psi…..2.If sufficient time is notallowed for the metal to coolto room temperature in theinvestment (quenching themold)…..Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 39.  Nicks on the metalcasting1. Carelessly cutting off thesprue leads2. Using the wrong mandrelin high spread latheRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 40.  Framework is too looseCarelessly grinding theinside of claspsRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 41.  Fracture of the claspsRemoving too much metalfrom retentive clasps.An improperly taperedclasp or one that is thinor having nicks encouragesbreakage by concentratingthe strain….Electro polishing for alonger time.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 42.  Warpage of theframeworkAbrasive rubber wheels andpoints can build up heat in theframework very quickly Loose frame workPolishing removes a definitivelayer of metal.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 43.  Distorted framework1.Clasps and other parts ofthe frame work can easilycatch in the polishingwheel.2.The forceusually distorts theframework and injures theoperator.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 44.  Incomplete Casting ofthe Metal frame work1. Metal too cold when cast.2. Improper spruing.3. Gas trapped in mold.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 45. 9) Mixing and packingacrylic resin:1. Packing the acrylic materialinto the flask before allowingthem to cool down at roomtemperature2. Packing the resin into theflask before it is ready topack.3. Underfiling the mould.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 46. 10) Deflasking and polishing the removablepartial denture:1. Distorted framework2. Increase in the vertical dimension3. Warpage of framework4. Scratches on the final metal framework5. Damaged denture teethRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 47.  Distorted clasps-Using a cloth wheel that was not brokenproperly would result in damaged removable partialdenture or injure the operator.-A new cloth wheel has strings of materialprotruding from it.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 48. -The strings couldtangle in the clasp or otherparts of removable partialdenture and snaps theremovable partial denturefrom the operator’s handsthrowing it out with greatforce.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 49.  Scratches on the denture-Course pumice leaves scratches.-It would be difficult to adequately polish aroundthe necks of denture teeth with a cloth wheel or a lathemounted bristle brush without damaging the contoursof the teeth.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 50.  Dull appearance of the dentureDetergent alone would not adequately removepolishing compound from the removable partialdenture.The remaining residue would prevent theremovable partial denture from achieving the luster.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 51. 11) Fitting theframework to the castand mouth:1. Framework too retentive onthe definitive cast.2. Frame Work not fittingexactly in the mouth.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 52. 12) Finishing and polishing of framework: Polished surface is dull with fine scratches-Sequence of finishing steps not followed Major and minor connector over thinned andflexible.-Framework over thinned with abrasive stonesduring finishingRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 53.  Clasps is nicked ornotched Frameworkdistorted-Frame work caughtin lathe during finishing.Rudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 54. 13) Fitting and adjusting the removable partialdenture to mouth : Failing to evaluate the denture borders whenplaced intra-orally. Loss of retention and support. Soreness or Ulceration of soft tissue in thepatient’s mouthRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 55.  Increase in the vertical dimension ofocclusionRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 56. Warpage of the RPD-If the patient does not seat theremovable partial denture correctly, theymay warp the removable partial denture orbe injured by it
    • 57.  Inadequate ridge quality andcontour Complete extent of theresidual ridge not covered bythe denture Inadequate coverage ofbasal seat tissues Failure to record basal seattissues in supporting formFAILURE IN SUPPORT OF DENTURE BASE
    • 58. 1) Articulation:Error in articulation of the castFAILURES IN OCCLUSIONRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 59. 2) Face bow transfer: Alteration in the jawrelation1. Positioning the face bow onpatient’s face.2. Placement of the forkRudd & Rudd, A review of 243 errors possible during the fabrication of a removable partial denture: Part IIIJ Prosthet dent; 2001;86(3); 251-261
    • 60. 3. Rocking of therecord4. Trimming of therecord or metalshowing through therecord.5. Face bow transfernot done.
    • 61. 3) Correction of occlusal plane: Sensitivity of teeth or incipient caries-after enameloplasty
    • 62. 4) Selecting and arranging teeth: Unable to interdigitate artificial teeth withopposing natural dentition Insufficient space to set posterior toothreplacement Anterior replacement teeth too short forsatisfactory esthetics
    • 63.  Dentists failing to select type, shade andmold of the denture teeth to be usedresulting in unaesthetic prosthesis notaccepted by patient
    • 64. FAILURE IN PATIENT-DENTIST RELATIONSHIP Failing to make a follow up appointment forthe patient Failure of dentist to provide adequatedental health care information, including careand use of prosthesis
    • 65. 1. Rudd & Rudd, A review of 243 errors possible duringthe fabrication of a removable partial denture: Part I& . J Prosthet dent; 2001;86(3); 251-2612. Rudd & Rudd, A review of 243 errors possibleduring the fabrication of a removable partial denture:Part II & . J Prosthet dent; 2001;86(3); 262-2763. Rudd & Rudd, A review of 243 errors possibleduring the fabrication of a removable partial denture:Part III & . J Prosthet dent; 2001;86(3); 277-286
    • 66. 4. McCracken’s: Removable partial Prosthodontics. Eleventhedition 20055. Stewart’s Clinical Removable Partial Prosthodontics.fourth edition6. A clinical overview of removable prostheses:3. principlesof design for removable partial denture .Dent update2002;29.7. A clinical overview of removable prostheses:4technological consideration when designing removablepartial denture. Dent update 2003;30:7-9
    • 67. THANKYOU

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