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Oscarrp Maximize function Minimize damage (Preparations Tooth prep …

- - - - Areas
        
        Upper: Hard Palate (Spoon)
        
        Lower: Buccal shelves (Mandibular slot denture)
    - - Stress-breaker
        
        Hinge joint in denture framework
        
        Teeth strong, ridge weak (Rigid)
        
        Teeth weak, ridge strong (stress breaker)
      - Altered cast techinque
      - Kennedy Class 1/2
        
        Distal Extension Saddle / Free End Saddle (DES/FES)
        
        Mesial rest on abutment (Prevent tipping)
    - - Rest
        
        Overlays Indications
        
        (Attrited / Partially errupt)
        
        Incisal Indications
        
        Advantage
        
        Mesial/Distal rest used for spliting
        
        Disadvantage
        
        Poor appearance
        
        Seldom used
        
        Cingulum (Anteriors) Indications
        
        When no posterior teeth present
        
        Difficult prep within enamel
        
        Inverted V shape
        
        Occlusal (Posteriors) Indications
        
        Prefered
        
        Prep
        
        Dish / Spoon floor
        
        No sharp line angles
        
        Within enamel
        
        Triangle shaped (marginal ridge)
        
        Larger better more use
        
        1/3 B/L & towards centre
        
        Floor should be like a dish, sloping down to centre
        but outside end shorter than inside end (Slide 4/9)
        
        Posterior (Occlusal surface)
        
        Anterior (Incisal; Bad or Cingulum)
      - Tooth
        
        Ranking
        
        6, 7, 3, 4/5, 1, 2
        
        7th roots fused, less divergent
        
        Ideal
        
        Multi-rooted
        
        Increased SA
        
        3rd molars are bad (Fused Short Roots)
        
        Keep root stump for overdenture abutment
        
        Abutment can carry own load + 1.5 replacement units
        
        If saddle too long, need mucosa support
        
        Any saddle 4 or more requires mucosa support
      - Clasps
        
        Some kind of support
- - - - U-shape/Horseshoe/Anterior palatal plate (Acrylic Option)
        
        Torus palatinus
        
        Only anteriors
        
        NOT KC1/2
      - Single Palatal Bar / Strap
        
        Tooth borne
        
        KC3 mod 1
        
        Bar/strap as wide as area bounded by 4 rests (> 8-10mm)
      - Anterior & Posterior bar/strap
        
        Common
        
        Less support
        
        equal or > 15mm opening between bars
        
        6-8mm bars
        
        but >8 mm straps
        
        Torus palatinus
        
        Anterior not required
        
        Avoided in KC1/2 insufficient support
      - Ring
        
        Palatal aspects of teeth & gingival margins are covered (vs A-P)
        
        Anterior teeth required
      - Plate / Full coverage (Spoon?) (Acrylic Option)
        
        A lot teeth missing
        
        Support / Direct Retention poor
    - - Lingual plate (Acrylic Option, too weak for bar)
        
        Insufficient lingual depth for bar
        
        High mouth floor Shallower
        Gingival Recession
        
        Very anterior lingual frenum
        
        Lingual tori
      - Lingual Bar (Ideal)
        
        Sufficient >8mm lingual depth
        
        3/4mm below gingival margin
        
        3/4mm thickness of lingual bar
        
        Not when ridges are very resorbed KC1
      - Sublingual bar (Rarely in SG)
        
        Lower than lingual bar
        
        When there is <6mm from gingival margin to floor
        
        >5mm of sulcus
      - Kennedy Bar / Continuous Clasp
        
        Dental Bar + Lingual Bar
        
        Need >8mm
        
        Provide IR
      - Dental bar (Rare in SG)
        
        Covers lingual aspects of Anterior teeth
        
        Sufficiently long clinical crown
        
        Adv: Frees gingiva; provides bracing and support
        
        Broader Kennedy Bar
      - Labial bar (Rare in SG)
        
        Unless teeth are so retroclined
- - - - Indirect : ARE RESTS (Indications)
        
        Kennedy 1 / 2
        
        Kennedy BIG 4
        
        Not necessary for tooth-borne RPD
        
        Fulcrum Line : Most distal abutments
        
        Class 2
        
        Yes
        
        Class 3
        
        Class 1
        
        Yes
        
        Use canine / 1st premolar
        
        Though incisors better theoretically
        
        Class 4
        
        Long span Yes
        
        Major connector IR (Palate)
      - Direct (Indications)
        
        4 eg. Kennedy 3 mod 1
        
        3 eg. Kennedy 2
        
        2 (Minimum) eg. Kennedy 1
        
        Clasps
        
        Suprabuldge (Indications)
        
        Common in tooth-bearing saddles
        
        Usually Kennedy 3 / small 4
        
        Not 1 / 2 they use mucosa borne also
        
        Circumferential
        
        Embrasure (Indications)
        
        Unmod Class 2/3
        
        Ring
        
        Hair-pin / Reverse action / Fish hook
        
        Infrabuldge
        Roach / bar
        
        I
        
        T
        
        L
        
        Y
        
        U
        
        Material (Decreasing rigidity)
        
        CoCr / Cast (0.25mm)
        
        Stainless steel / Wrought (0.5mm)
        
        Gold (0.75mm)
        
        RPI (Indications)
        
        Kennedy Class 1 & 2
        
        Tooth & Mucosa borne
        
        Lower dentures (As maxillary has palate)
        
        Only CoCr
        
        Proximal plate (Distal)
        
        I bar (Retention)
        
        Mesiobuccal or Mid buccal (reciprocate plate)
        
        To resist distal displacement
        
        Engage undercut
        
        Rest (Mesial)
        
        Guide Planes
        
        Frictional retention
        
        2-3mm long
        
        3/4 GP sucfficient
        
        more difficult in and out
        
        Extension into undercuts
        
        Oblique remove: Labial / Incisor flanges
        
        Flexible denture: No metal retainer, aesthetic
        
        (cost / hard to insert / painful when chewing)
        
        Extra: Sectional denture
        
        Extra: Swinglock system (need hygiene)
        
        Prefab
        
        Implants / Magnets