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stewart's (major connectors: indirect retention, embrasures extend…
stewart's
major connectors: indirect retention, embrasures extend lingual surfaces
max: 6mm from gingival margin, palatal bar (short Class III), palatal strap (Class II not IV), AP palatal strap (distal extension bases, ant teeth), complete palate (distal extension bases, ant teeth)
mand: 3mm form gingival margin, lingual bar (3mm), lingual plate (indirect retention)
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reciprocal element: cast clasp, lingual plate
minor connectors: direct insertion and removal, reciprocal element or approach arm for infrabulge clasp
simple circlet: tooth supported, clasp arms away from edentulous
reverse circlet: undercut buccal or lingual adjacent to edentulous, if infrabulge prohibited, distal extensions, mesial to distal
ring clasp: tipped mand molar (ML undercut), mesial rest, can use extra distal rest
wrought wire: abutment adjacent to Class I or II post edentulous, undercut MB, disal rest, bigger undercuts
infrabulge: push type retention more effective, aesthetic, I bar, mesial rest, Class I or II
if MB undercut on abutment adjacent to distal extension use wrought wire. if retentive undercut DB or midbuccal use infrabulge and if contraindications use reverse circlet
clasp config: quadrilateral (Class III), tripodal (Class II), bilat (class I, need indirect retainers)
reverse circlet (MO rest, DB undercut, distal extensions)
combination clasp: adjacent to distal extension w MB undercut, cast reciprocal element and wrought wire retentive clasp
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auxiliary rests: support for lingual plate major connectors (rests not further back than first premolars)
Class I enter at number of angles, Class II same unless mod determines path, Class III and IV single path of insertion, minor connectors govern
Class I: DB undercut use infrabulge, MB undercut use wrought wire, reciprocal (bracing arms or lingual plating), rests adjacent to edentulous spaces, 2 indirect retainers
Class II: mod present clasp teeth adjacent to edentulous space, circumferential clasps, reciprocation (bracing arms or lingual plating), rests adjacent to edentulous spaces
Class III: quad config direct retainers, rests adjacent to edentulous space
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Undercut MB and DB but soft tissues dont favour infrabulge use combination clasp (wrought wire retentive element w cast reciprocal element)
I bar: mesial rest, distal proximal plate