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61 Cards in this Set
- Front
- Back
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What are the 4 functions of a RPD?
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Replace missing teeth, Replace missing periodontium, Restore Function, Preserve existing tissue (hard/soft)
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What 3 ways are the existing tissues protected/ preserved in an RPD?
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Adequately supporting occlusal forces, Minimizing movement during function, and Distribution of forces
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Define Support
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Resistance to vertical seating forces
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Define Stability
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Resistance to horizontal components of force
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Define Retention
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Resistance to vertical dislodging forces
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What components of an RPD provides support?
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Rest, Major Connectors, and Denture Base
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What components of an RPD provides Stability?
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Proximal Plates, Minor Connectors, Reciprocal Elements
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What components of an RPD provides Retention?
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Proximal Plates, Rest, and Clasp Arms
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What it Torque?
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A rotational force created on the abutment by the lever-like action of the RPD
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When an RPD must rest on tissue, how are these forces compensated for?
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Optimize tissue support, and Good RPD Design
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What is the best compensation for tissue supported RPD destructive forces?
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Optimal Tissue Support
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What are the 3 types of tissue bourn RPD’s?
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Interim, Temporary, or Transitional
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What Kennedy Class(s) would be completely tooth borne
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KIII and Short Span KIV
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What Kennedy Class(s) would be tissue-tooth borne
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KI, KII and Long Span KIV
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What are the favorable tissue characteristics for mucosa, submucosa and bone?
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Mucosa: Keratinized and Attached, Submucosa: Firmly Bound and Dense Fibrous, Bone: Cortical, Presence of Muscle Attachments, and Favorable Bone Index
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What RPD components contribute to tissue support?
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Direct: Denture Base/ Major Connector (Mx only) and indirectly minor connectors
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What are the favorable tooth characteristics for an RPD?
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Crown <1:1, absence of Periodontal disease, lamina dura present, and bone
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What RPD components contribute to tooth support?
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Direct: Rest, Indirect: Major/Minor connectors
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What are the ideal dimensions for a rest seat on a Molar and Pre-Molar? Molar
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1/4W, 1/3L and Pre-Molar: ½L and ½-1/3 Width
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What RPD components contribute to stability?
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Tooth: Proximal Plates, Minor connectors, and Clasp Arms, Tissue: Major Connectors (Mx only) and Base
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How is support and stability best provided to an RPD? Support
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By axial loading of teeth through rest. Stability: Rigid vertical components of RPD against multiple teeth
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What is the definition of a minor connector?
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Join RPD to major connector
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What are the 3 categories of a minor connector?
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1. Join indirect retainers or auxiliary rest, 2. Join clasp assemblies and 3. Join base
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What are the 4 characteristics of a minor connector that connects to a rest?
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In embrasure, 5mm part, meet major connector at 90 deg., and with rounded corners
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What 2 minor connectors join clasp assemblies?
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Proximal Plate and approach arm
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What is the ideal shape of a guide plane?
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2-3mm high, 4-5mm wide
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What 3 types of minor connectors join the denture base?
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Bead, Mesh, and open (ladder)
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What is the finish line?
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The planned junction between the frame work and the future denture base
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What are the 3 characteristics of the finish line?
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Internally 90 deg, externally <90 deg and offset
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What is the desired length of a maxillary and a mandibular denture base?
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Max: 2/3 length of edentulous area- just beyond tuberosity (as long as occlusion will allow). Mand: 2/3 Length of edentulous area
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Why is it necessary that the major connector is rigid?
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To distribute the forces of occlusion
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How far should the denture major connector be from soft tissue?
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Max: 6mm Mand: 3mm
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What are the advantages, disadvantages and use for a palatal bar?
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A: minimal tissue coverage D: Very little tissue support (uncomfortable) U: small KIII
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What are the advantages, disadvantages and use for a palatal strap?
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A: Rigidity, Comfort D: Cover more soft tissue U: KIII, small KII
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How thick is a palatal strap, and what is the opening size necessary for an a-p strap?
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8mm thick, 15x20 mm minimum
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What are the advantages, disadvantages and use for an A-P Bar?
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A: Good Rigidity, avoid tori D: Speech, less tissue support, U: Long span KIII?? Remember anterior is strap posterior is bar
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What are the advantages, disadvantages and use for a A-P Strap?
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A: Good rigidity, good tissue support D: Speech and Comfort, U: All
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What are the advantages, disadvantages and use for a Maxillary Horseshoe?
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A: avoid Tori D: rididity, speech, occlusion, U: not many, severe gagger
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What are the advantages, disadvantages and use for a Full Palate Coverage Maxillary RPD?
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A: Rigidity, Tissue Support, Retention, D: Inc. tissue coverage, comfort, speech, occlusion, U Large KI, max support needed, perio splinting
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What are the advantages, disadvantages and use for a Lingual Bar?
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A: Simple, min. tissue coverage, D: Comfort/tissue impingement, U: KI-IV
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What are the advantages, disadvantages and use for a Lingual Plate?
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A: Use w/ small space, Rigidity, splinting. D: Inc. Tissue coverage, U: KI-IV, vs Max. complete denture
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What are the advantages, disadvantages and use for a Double lingual bar?
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A: Ind. Retention, minimal tissue coverage, D: Traps food, uncomfortable, hard to make, U: KI-IV
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What are the advantages, disadvantages and use for a Labial Bar?
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A: avoid tipped teeth/ tori, D: poor rigidity, U: KI-IV through rarely
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What is an indirect retainer?
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An RPD component that is on the opposite size of the fulcrum, that assists via mechanical leverage the direct retainer in preventing dislodgement away from the tissue
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What are the 4 components to a clasp?
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Rest, Minor Connector, Retentive arm, and Reciprocal arm
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What are 4 possible reciprocal elements?
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Clasp arm, Proximal Plate, lingual plate, other minor connectors
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What are the 6 clasp assembly requirements?
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Retention, bracing (reciprocation), support, Adequate encirclement, passivity and periodontal health
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What are the 3 clasp categories?
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Infrabulge clasp(Bar) , suprabulge clasp (Circumfrential), and combination clasp
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What RPI stand for?
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R: Rest, P: Plate (Proximal), I: I bar
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What are the indications and contraindications for an I bar?
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I: Esthetics, Mid-buccal .01” undercut, KI and KII ONLY (only free end abutments) C: >2mm tissue undercut, <5mm vestibule, no undercut
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What are the indications and contraindications for a T bar?
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I: MB/DB .01” undercut, C: Less stress releasing than RPI
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What are the indications and contraindications for a modified T bar?
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I: Esthetics, almost as good as I bar, MB or DB .01” undercut C: Tissue Uc >2mm, Vestibule <5mm
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What are the 6 classes of suprabulgar clasps?
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Akers, Ring, C clasp, Basket, Onlay, and RPC
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Define Path of Insertion?
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The specific direction in which a prosthesis is placed upon abutment teeth
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What are 3 considerations to have when choosing guide plane locations?
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1.Natural guide planes present? 2. is excessive prep required? 3. is there a deviation from perpendicular to plane of occlusion?
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What are 2 common interferences to path of placement?
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Tissue Undercuts, and teeth tipped lingually
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What are 3 possible methods to create retention?
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Pressure (vacuum), Friction, mechanical interlocking
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Define Indirect Retainer?
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Component that resists rotational forces of the free end away from the tissue
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Define Reciprocation?
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The resistance to horizontal force by an ACTIVE retentive element towards an abutment tooth
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Define Reciprocal element?
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Component that counteracts the lateral force of the retentive clasp during insertion and removal
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Define Passivity
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The condition of inactivity of teeth tissue and denture assumed when not under masticatory forces
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