Dental Dentures: Partial | Cosmetic Dentistry
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4.3 Kennedy Class I, Upper Arch
31
The natural result of bilateral edentulous areas posterior to the remaining teeth is two free-end saddles. Statically speaking, we are presented with the following situation: When one saddle is depressed under a functional load, a lifting force, or torsional stress, is generated on the opposite side, the axis of rotation runs through the distal rest on the same side and the end of the saddle on the opposite side.
Here, too, it is crucial to limit the magnitude of saddle displacement in a gingival direction; broad extension of the saddle, avoidance of occlusal forces on the distal third of the saddle (Fig. 31).
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4.2 Three Point Support
 28 In the case of a Kennedy Class II Mod. I, correct planning results in dental rests which form a support-triangle. Occlusal forces on the entirely tooth-supported saddle create no problems. However, the free-end saddle acts as a lever. When the saddle is depressed, the denture rotates around an axis formed by connecting the two most distal support points, or rests, one on each side of the arch. Lifting forces occur perpendicularly on the opposite side of the axis of rotation. The law of leverage applies here: Load x Load arm = Effort x Effort arm (L • I = K • k) (Fig. 28). (more…) |
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4.1 Four Point Support
 23 In cases where the edentulous spaces are adjoined by natural teeth, four point support is the result most often achieved. This is an especially favorable situation when all replacement teeth lie within the four points of support (Fig. 23). (more…) |
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4. Static Analysis
The “static analysis” must be completed after designing the base but prior to planning for the anchorage. It represents an intellectual, theoretical determination and not a structural element of the partial denture. How the denture reacts to forces placed on the various saddle constructions is what must be determined here. This information enables conclusions to be drawn as to the detailed design of the structural elements as well as indications on the limits of use for the one-piece cast denture.
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