Dental Dentures: Partial | Cosmetic Dentistry
Dental Dentures
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6.1 Dental Support Distant from the Saddle
 49 Especially in the presence of a free-end saddle, in particular for a Kennedy Class I, the lifting forces exerted by sticky foodstuffs have a detrimental effect. Special attention must be given to indirect retention in such cases. Care must be taken to insure that a lifting of the free- end saddle results in movement of the clasp arm toward the height of contour. That will occur when the dental rest is placed slightly further from the saddle than the tip of the retentive arm of the clasp (Fig. 49). (more…) |
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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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Tags: Denture Support
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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Tags: Denture Support, Statics