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Parts of Removable Partial Denture by FARYAL SAEED ABDAL

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This lecture is about the Component Parts of Removable Partial Denture. I have a bit different classification of parts which makes it easy to understand and remember.

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Parts of Removable Partial Denture by FARYAL SAEED ABDAL

  1. 1. PARTS of Removable Partial Denture BY FARYAL SAEED ABDAL about parts fabricate teams services follow
  2. 2. author parts fabricate teams services follow FARYAL SAEED ABDAL Chief Dental Technologist MD (Dentistry) | BA (Mass Comm.) University Medical & Dental College University of Faisalabad Faisalabad, Pakistan
  3. 3. about parts fabricate teams services follow Support 3 Retainer 2 Connector 1 MAJOR Conn. MINOR Conn. DIRECT Rt. INDIRECT Rt. RIGID Sup. RESILINT Sup. Dent Base 4 CONVENTIONAL MODIFIED
  4. 4. about parts fabricate teams services follow REMOVABLE PARTIAL DENTURE Connector Major Minor Retainer Direct Indirect Support Rigid Resilient Denture Base Conventional Modified
  5. 5. about parts fabricate teams services follow Connectors: Connect the different parts of RPD. Major Connector: Connects the parts of prosthesis located on the one side of the arch with the other side. TYPES OF MAJOR CONNECTOR - Plate (max coverage area) - Strap (8mm+) - Bar (4mm)
  6. 6. about parts fabricate teams services follow MAJOR CONNECTOR: Connects the parts of prosthesis located on the one side of the arch with the other side. FUNCTIONS - Unification of major parts - Distribution of applied forces - Minimization of torque - Cross arch stabilization REQUIREMENTS - In Max., 6mm away from gingiva - In Man., 3mm away from gingiva - Border should be parallel to the gingival margin - Adequate rests to be provided to prevent the lateral and horizontal forces
  7. 7. about parts fabricate teams services follow MAJOR CONNECTOR: Connects the parts of prosthesis located on the one side of the arch with the other side. MAX. MAJOR CONNECT. TYPES - Single palatal bar - Single palatal plate - Antero-posterior palatal bar - Antero-posterior palatal strap - Palatal plate-type - U-shaped connector MAN. MAJOR CONNECT. TYPES - Lingual bar - Linguoplate - Sublingual bar - Double lingual bar - Cingulum bar - Labial bar - Swing-lock design
  8. 8. about parts fabricate teams services follow Connectors: Connect the different parts of RPD. Minor Connector: Connecting link between the major connector and other units of prosthesis like clasp assembly, indirect retainer and rests. TYPES OF MINOR CONNECTOR The connector which connects/joins - Direct retainer to major connector - Indirect retainer to major connector - Denture base to major connector - Acts as approach arm in bar-type clasp
  9. 9. about parts fabricate teams services follow MINOR CONNECTOR: Connecting link between the major connector and other units of prosthesis like clasp assembly, indirect retainer and rests. FUNCTIONS - Connects the major connector with other parts - Transfers the stresses to prosthesis - Transfers forces to abutments and edentulous ridge IDEAL REQUIREMENTS - Should be positioned in embrasure area - At least 5mm space between two minor connectors - Should provide space for arrangement teeth - Should facilitate the path of placement
  10. 10. about parts fabricate teams services follow Retainers: The part of PRD which is/may used for fixation, stabilization or retention. Direct Retainer: resists the dislodgement of the denture away from the residual ridge in vertical dimension. Common source of retention are ‘clasps’. TYPES OF DIRECTOR RETAINERS 1. Extracoronal (engage external contour of an abutment) - Retentive clasp arms - Attachments 2. Intracoronal (resides within the normal contours of an abutment) - Precision attachments - Semiprecision attachments
  11. 11. about parts fabricate teams services follow DIRECT RETAINER: resists the dislodgement of the denture away from the residual ridge in vertical dimension. PRINCIPLE OF CLASP ASEMBLY - Retention - Support - Stability - Reciprocation - Encirclement - Passivity CLASP PARTS - Retentive arm - Reciprocal arm - Rest - Body - Minor connector
  12. 12. about parts fabricate teams services follow DIRECT RETAINER: resists the dislodgement of the denture away from the residual ridge in vertical dimension. Clasps are of two types OCCLUSAL APPROACHING | CIRCUMFERENTIAL CLASP • Simple circlet clasp • Reverse circlet clasp • Multiple circlet clasp • Embrasure clasp • Ring clasp • Fishhook or hairpin clasp • Onlay clasp • Half and Half clasp • Back action clasp • Combination clasp GINGIVAL APPROACHING | BAR CLASP • T clasp • Modified T clasp • Y clasp • I clasp - RPI System - PRA System
  13. 13. about parts fabricate teams services follow Retainers: The part of PRD which is/may used for fixation, stabilization or retention. INDIRECT RETAINER: assist the direct retainer in preventing the displacement (of distal extension) of denture base by functioning through lever action on opposite side of fulcrum line. FORMS OF INDIRECT RETAINERS - Rests (Occlusal, Cingulum, Canine) - Bars (Cingulum, Lingual) - Linguoplate - Rugae support - Modification areas
  14. 14. about parts fabricate teams services follow INDIRECT RETAINER: assist the direct retainer in preventing the displacement (of distal extension) of denture base by functioning through lever action on opposite side of fulcrum line. FUNCTIONS - Activates the direct retainer to prevent the movement of a distal extension - Reduces the antero-posterior tilting leverage on the abutments - Contact of its minor connector with the axial tooth surface helps in providing stabilization against horizontal movement - Anterior teeth supporting indirect retainers are stabilized against lingual movement FUNCTIONS - May act as auxiliary rest to support a portion of the major connector, facilitating the stress distribution - Helps in accurate repositioning of the prosthesis during relining or rebasing - Aids in additional support and stability
  15. 15. about parts fabricate teams services follow INDIRECT RETAINER: assist the direct retainer in preventing the displacement of distal extension of denture base by functioning through lever action on opposite side of fulcrum line. EFFECTIVENESS OF INDIRECT RETAINER - Seating of occlusal rests in movement - Distance and location from fulcrum line - Rigidity - Supporting tooth effectiveness
  16. 16. about parts fabricate teams services follow Support: resistance to the movement towards the tissues. Rigid Support: component (rest) of RPD lying on the tooth (rigid) surface that provides the vertical support to the prosthesis. FUNCTION - Provides the vertical support and transmits forces to abutments - Resists the tissue-ward movement of denture - Maintains the components of RPD in their planned positions - Distributes and directs occlusal loads to the abutments - Directs the forces along the long axis of the tooth
  17. 17. about parts fabricate teams services follow Rigid Support: component (rest) of RPD lying on the tooth (rigid) surface that provides the vertical support to the prosthesis. REST TYPES - Occlusal rest - Cingulum rest (canine and incisor) - Incisal rest REST REQUIRMENTS - Enamel should be sound - Rest is supposed to be 2.5mm deep
  18. 18. about parts fabricate teams services follow Support: resistance to the movement towards the tissues. Resilient Support (Distal Extension): support obtained by bone/tissues. FACTORS EFFECTING THE SUPPORT - Contour & Quality of residual ridge - Extent of residual ridge coverage by the denture base - Type & accuracy of impression registration - Accuracy of the fit of denture base - Design of RPD framework - Total occlusal load applied
  19. 19. about parts fabricate teams services follow Denture Base: the part which rests on the saddle area and carries the artificial teeth. Conventional Denture Base: denture flanges are fully extended into the sulcus areas to cover maximum available area. FUNCTION Artificial teeth used on a denture transfer the occlusal forces to the denture base and subsequently to the natural teeth and edentulous ridge. Denture base provide the retention, stability and support.
  20. 20. about parts fabricate teams services follow Denture Base: the part which rests on the saddle area and carries the artificial teeth. Modified Denture Base: where conventional extended flanges are not suitable. Gum-fit is most common. INDICATIONS - Aesthetics - Deep undercuts - Proclined premaxilla - Bulging (labial segment or tuberosity)
  21. 21. about parts fabricate teams services follow IDEAL REQUIRMENTS - Should be rigid - Should provide vertical support - Should protect tissues and not the impinge them - Should be compatible with tissues - Should be comfortable to patient - Easily cleanable - Metal/alloy should be allergy free - Should not allow food accommodation - Should not alter natural contour - Should be inconspicuous (as possible) - Should cover as little tissues as possible
  22. 22. about parts fabricate teams services follow Initiator Patient visits the clinic for prothesis. Fabrication procedure initiated. Clinic Fabricator Lab is responsible for the fabrication of prosthesis. Lab User Prothesis is presented to the patient for use. Patient
  23. 23. about parts fabricate teams services follow Assessment Diagnostic casts are made. Initial survey is done. Mouth preparations done accordingly. Final models made. Survey/Design Final survey is done. RPD parts are designed. Refractory casts are made and design is transferred on it. Wax-up All the parts are waxed-up according the design. Pattern is invested Metal Process Metal casting done. Metal frame is finished and polished. Trail(s) Fame is trialed (tested) for proper fitting. Teeth trail also done (if needed). Final Process/Insertion Acrylic/teeth processed. Prothesis finished and polished. Inserted. Adjustments done afterwards as per need.
  24. 24. about parts fabricate teams services follow 01 02 03 IMRAN FARRUKH Principal, Professor Dept. of Prostho., UMDC, University of Faisalabad, Pakistan MUHAMMAD BILAL Assistant Professor Dept. of Prostho., UMDC, University of Faisalabad, Pakistan SABA & MADIHA Demonstrator Dept. of Prostho., UMDC, University of Faisalabad, Pakistan 04 INAM & Masood Lab Professional Dept. of Prostho., UMDC, University of Faisalabad, Pakistan
  25. 25. about parts fabricate teams services follow PG Programs M.Phil. Programs Graduate/BDS 4 years degree program BS Dental Technology 4 years degree program Auxiliary Courses Short courses Workshops Prosthodontic related workshops Dental Technician Diploma 2 years degree program
  26. 26. about parts fabricate teams services follow facebook.com /faryalsaeed gmail.com faryalsaeed twitter.com @faryalsaeed whatsapp +92 312 4027663

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