CLASSIFICATION AND COMPONTNTS OF REMOVABLE ... - …

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3 Material may contain medical images that may be disturbing to some ANDCOMPONTNTS OFREMOVABLE PARTIALDENTURES2 CLASSIFICATION OFREMOVABLE PARTIALDENTURESPARTIAL DENTURED efinitionA dental prosthesis that restores one or more but notall of the natural teeth and/or associated parts andthat is supported in part by natural teeth, dentalimplant supported crowns, abutments, or other fixedpartial dentures and /or the mucosa; usage: a partialdenture should be described as a fixed partial dentureor REMOVABLE partial denture based on the patient scapability to remove or not remove the The Academy of Prosthodontics (1999).

4 Glossary ofProsthodontic Terms (7th ed). St. Louis: PARTIAL DENTURECLASSIFICATION- kennedy CLASSIFICATION SYSTEM-CLASS I - Bilateral Posterior Edentulous AreasCLASS II - Unilateral Posterior Edentulous AreaCLASS III - Unilateral or Bilateral EdentulousArea(s) Bounded by RemainingTooth/TeethCLASS IV - Single Edentulous Area Anterior toRemaining Teeth and Crossing the MidlineNote: The U of M follows this CLASSIFICATION system and uses therules proposed by Dr. Applegate for applying the CLASSIFICATION SYSTEMRULES(Proposed by Dr. Applegate)1. CLASSIFICATION follows all mouth preparations including extractions2.

5 Edentulous areas with no teeth replacements are not considered3. Third molars are not considered unless present or being replaced4. Additional edentulous areas are modification spaces a. Anterior space - Ab. Posterior space - P5. Class I or II situations take precedence over IV situations6. A Class III situation takes precedence over a Class IV situation4 kennedy CLASS ICLASS I - Bilateral Posterior Edentulous AreasSource: Jeff Shotwell, University of Michigan, 2008 kennedy CLASS IICLASS II - Unilateral Posterior Edentulous Area Source: Jeff Shotwell, University of Michigan, 20085 CLASSIFICATION WITH MODIFICATION AREASCLASS II-PCLASS II-A-2 PSource.

6 Jeff Shotwell, University of Michigan, 2008 kennedy CLASS IIICLASS III - Unilateral or Bilateral Edentulous Area(s) bounded by Remaining Tooth/TeethUNILATERALS ource: Jeff Shotwell, University of Michigan, 20086 kennedy CLASS IIIBILATERALS ource: Jeff Shotwell, University of Michigan, 2008 kennedy CLASS IVSource: Jeff Shotwell, University of Michigan, 20087 kennedy -APPLEGATE CLASS VISource: Jeff Shotwell, University of Michigan, 2008 COMPONENTS OFREMOVABLE PARTIALDENTURES8 REMOVABLE PARTIAL DENTURECOMPONENTS- Major Connector- Minor Connector- Direct Retainer- Base- Replaced Teeth- Indirect Retainer (Class I and II RPD s only)MAJOR CONNECTORD efinition: The part of a REMOVABLE partial denture that joins thecomponents on one side of the arch to those on theopposite side.

7 The Academy of Prosthodontics (1999). Glossary ofProsthodontic Terms (7th ed). St. Louis: CONNECTORS- Lingual Bar- Labial Bar- Lingual PlateMAXILLARYMAJOR CONNECTORS- Complete (or modified) PalatalPlate- Anteroposterior Palatal Strap- Anterior Palatal Strap91. LINGUAL BAR - Six gaugehalf-pear shape approximately 4mm in height with superiorborder at least 3mm from fgm MAJOR CONNECTORS7mmThe bar is pear shaped in crosssection with the thickest partalong the inferior LINGUAL PLATE Used whenfgm to floor of mouth is less than7mm, or when anteriors are mobileand their longevity is relief wax is used to ensure that bar or plate does not contact : Jeff Shotwell, University of Michigan, 2008 Superior border is placed atthe junction of incisal andmiddle thirds.

8 MAXILLARY MAJOR CONNECTORS-Wide application to all classifications, but mostly to Cl I and Provides maximum support as plate rests on tissue (as do all maxillarymajor connectors.)- Contraindicated where tori are : Jeff Shotwell, University of Michigan, 2008 COMPLETE PALATALPLATEMODIFIED PALATALPLATEA nterior border ends in valley ofrugae not less than 6mm from fgmPosterior border must notimpinge upon movable tissue10 Used where torus precludes useof palatal plate, provided aminimum of 5mm exists betweenthe posterior aspect of thetorus and the vibrating width of 4mmMAXILLARY MAJOR CONNECTORS(MID)PALATALSTRAPUsed mainly in Cl IIIsituations width ofstrap varies to suitthe clinical PALATALSTRAPS ource.

9 Jeff Shotwell, University of Michigan, 2008 These designs arenot recommended the ones on the leftlack rigidity andtherefore do notdistribute bars on theright are too high(thick) for anterior palatalstrap in design 1. isonly used where atorus extends towithin 5mm of thevibrating MAJOR CONNECTORSS ource: Jeff Shotwell, University of Michigan, 200811 LABIAL BAR -Form and Usage: Same as the lingual bar but placed buccally(labially) due to severe lingual inclination of the remainingteethLabial BarLabial BarSource: Jeff Shotwell, University of Michigan, 2008 MINOR CONNECTOR(Unification with Rigidity)Definition.

10 The connecting link between the major connector or base of a removablepartial denture and the other units of the prosthesis, such as the claspassembly, indirect retainers, occlusal rests, or cingulum rests. The Academy ofProsthodontics (1999). Glossary of Prosthodontic Terms (7th ed). St. Louis: :- must be rigid to distribute stress between linked components- must not impinge on underlying mucosa; tissue relief (30 ga.) needed in the mandibular arch- mucosal surface is highly polished to prevent plaque accumulation12 Usage:- minor connector and restjunction must be at least thick- try to place interproximally- joins major connector at aright angle- should be located at least 5mm from other verticalcomponentsMINOR CONNECTOR -Source: Jeff Shotwell, University of Michigan, 2008 DIRECT RETAINERD efinition: That component of a REMOVABLE partialdenture used to retain and prevent dislodgment,consisting of a clasp assembly or precisionattachment.