Dental Dentures: Partial | Cosmetic Dentistry
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7.3 Anterior Dentition Remaining in the Lower Arch, Edentulous Upper Arch
 65 The following situation is very often encountered: the upper arch is edentulous and in the lower arch only the anterior dentition remains, for example, 34 to 44. If the lower arch is not satisfactorily restored the entire masticatory process will take place in the anterior region of the mouth. This is not particularly disadvantageous for the lower arch, but in the upper arch a flabby ridge often develops. This is due to the concentrated chewing force over a smaller area with subsequent bone resorption and its replacement by connective tissue (Fig. 65). (more…) |
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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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3.2 Upper Arch Prophylaxis
 12 As in the lower arch, there are no indications for the use of a lingual plate in the upper arch. The argument often heard that the lingual plate is more easily repaired is not valid because the lingual plate itself is often responsible for the premature need to extend the prosthesis. The denture base departs at a blunt angle from the terminal tooth at the junction between tooth and saddle (Fig. 12). (more…) |
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3.1 Lower Arch Prophylaxis
 8 The best design for caries and periodontal prophylaxis would be achieved if the partial denture base had no contact with the periodontium. Lingual plates as saddle connectors are, therefore, out of the question Only the lingual bar should be used with its upper edge ending approx. 5 mm from the marginal gingiva. The partial denture design begins at this point (Fig. 8). (more…) |
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Tags: Dental Arch, Saddle