RPD+Design+Rules+and+Examples



//*The// //following has been provided by Dr Sutton and is also in a document above// **__ Framework Designing – simplified __** ** Steps ** : i. To pre-determine where rest seats will go based on the occlusion ** -- Remember: NO undercuts at 0 o, NO retention ** i. To conceal clasps for esthetics (ideally in gingival 1/3rd) ii. To minimize dead space under max anterior ridge tissue undercut iii. For rotation/dual path designs, etc. ****Tip for designing sequence = Black, Red, Blue, then Brown.** **Color Codes** ** Black ** = survey lines, tissue undercuts, incisor vertical overlap, proposed tooth replacement on base of cast ** Red ** = Areas to be prepared, recontoured (rest seats, guiding planes, enameloplasty), relieved, or surgery. Indicates the precise location of clasp’s retentive undercut. Use for tripod marks. ** Blue ** = outline the exact position/extent of each acrylic resin denture base. Designates the external finish line location. ** Brown ** = outline of the major and minor connectors, clasps, rest seats (if already prepared), and indirect retainers. **Prescription sequence –write these categories in this order on your prescription**
 * 1) 1. Evaluate the occlusion and base line the occlusal plane (put the casts together!)
 * 2) a. Dx mounting
 * 3) b. Consider diagnostic setup/waxing
 * 4) c. At a minimum use hand articulation or Plasterless articulator
 * 1) 2. Tilt: assess 0o tilt without analyzing rod.
 * 1) a. Then use analyzing rod to view undercuts, eliminate hard tissue interferences
 * 2) 3. Assess Undercuts with analyzing rod and 0.010 gauge
 * 3) a. Change tilt to optimize undercut
 * 1) 4. Guiding Planes
 * 2) a. Parallel to path of placement
 * 3) b. 2-3 mm in height (depending of philosophy used – Krol, Stewart, McCracken…)
 * 4) 5. __ NOW __ Tripod and Survey
 * 5) a. Tripod preferred tilt of cast and mark with red +, circled in red.
 * 6) b. Survey teeth and soft tissue down to gingiva
 * 7) c. Survey from teeth and gingiva to cast vestibule (will be blocked out)
 * 8) d. Mark incisal overlap from lingual
 * 1) Rests (Describe the tooth # and location of rest seat)
 * 2) Guiding Planes (Describe the tooth # and location)
 * 3) Retention (Describe the tooth #, type of clasp (Akers, CR, WW) and location of the retentive tip)
 * 4) Acrylic Retention (OR [open retention], Lattice, __Ladder-like__, BEADS, Mesh, RAP [reinforced acrylic pontic, BP [braided post]…)
 * 5) Major connector (Describe type of major connector)
 * 6) Minor connectors (Describe other usual or unusual features as indicated)