Partial Denture Framework Calculator

Class I and II are distal-extension cases -- the edentulous space has no tooth behind it to help support the denture base, so the base rotates under chewing load in a way a tooth-bounded (Class III or IV) space does not. This calculator assigns the stress-breaking RPI/RPA-style design to distal-extension cases specifically to reduce the torquing force that rotation transmits to the abutment tooth.

Only up to a point -- Number of clasps is calculated as Abutment teeth times 0.7, rounded, but capped at 6. Once Abutment teeth reaches roughly 9, the calculation already exceeds that ceiling, so adding further abutment teeth beyond that point no longer changes the clasp count in this calculator's output.

Major connector type is reported as the actual connector name, not a bare code, and which names are possible depends on which Arch you select: maxillary results are Palatal strap, Palatal plate, or Palatal bar, while mandibular results are Lingual plate or Lingual bar. Horseshoe, sublingual bar, and labial bar connectors exist clinically but are reserved for anatomical exceptions (a large torus, inadequate vestibular depth, or lingual undercuts) that this calculator has no input to detect, so it never recommends them automatically -- a clinician should override to one of those designs when that anatomy is present. For a bounded (Kennedy Class III/IV) maxillary case specifically, this calculator recommends Palatal strap rather than Horseshoe: a palatal strap is the properly indicated rigid connector for a bounded space with adequate remaining teeth, while Horseshoe is deliberately less rigid and reserved for a large-torus exception this calculator cannot assess from Kennedy class and missing-teeth counts alone.

This calculator recommends a lingual plate over a lingual bar once Missing teeth exceeds 4, reflecting that a lingual plate provides more horizontal stabilization and can help splint periodontally weaker teeth -- both more useful as the edentulous span (and typically the resorption) becomes more extensive, versus a simpler lingual bar for smaller spans.

No -- it applies the standard Kennedy classification and RPI/RPA clasp-design logic taught in removable prosthodontics, but a real framework still depends on a direct clinical and cast examination of undercuts, periodontal support, and path of insertion, none of which this calculator has access to.