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L4 Components of RPD (Components (5) Rests
Dissipate vert/hori forces
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L4 Components of RPD
Components
3) Saddles
Teeth
- Number of teeth
- Size of teeth
- How many missing teeth
- Length of edentulous span
- Facial symmetry
- Occlusion
- Smaller (Reduce force to bone/tissue)
- Tongue space
- Balance
- Material
- Porcelain
- Acrylic resin
- Hybrid resin
- Metal (Gold/Co-Cr)
Flange
- Length of flange
- Resorption
- Number of replacement teeth
- Restore normal contour
- More teeth, Longer
- Less teeth, Shorter
- Gum margin
- Colour of flange
5) Rests
- Dissipate vert/hori forces
- Support (Not Resistance)
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1) Direct Retainers
Clasp
- Engage undercut providing Rentention
- Requires
- Retentive Clasp
- Reciprocal Clasp (Not for acrylic, denture /acrylic fracture) use major connector instead
- Rest
- Minor connector
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2) Indirect Retainers
- eg. Free end saddle, contralateral side clasp, prevent back from lifting up
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6) Reciprocators
- If don't have Lingual Drift will be seen due to buccal clasps
- Does not engage undercut
Function
Retention
(GUM-SI)
Guiding planes
- Path of insertion, different from COMMON path of displacement
- 2/3mm from occlusal/incisal (Suffice) + Block out undercut below
- REDUCE NUMBER OF CLASPS
- Reduce food trapped
Undercuts
Tissue
- Flanges
- Anterior Labial
- Buccal
- Tuberosity areas
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Acronyms
DISCRR (All components)
- Direct Retainer
- Indirect Retainer
- Saddle
- Connector
- Rests
- Reciprocator
I-GUMS (Retentive)
- Implants
- Guide Planes
- Undercuts
- Tissue
- Tooth (Clasps / Roaches)
- Muscular
- Saliva
BMRC (Supportive)
- Base & Flanges
- Major Connectors
- Rests
- Clasps above survey line
Retention
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Why
- Swallow / Kill
- Confidence
What
- Depends on patient's comfort
- Easily inserted / removed by patient
- Support: Occlusal force
Prevent impinging on gingival tissues
- Resistance/Retention: Falling out
text
- Bracing A-P or lateral movements
- Guide Planes: Friction against teeth
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