Dental Dentures: Partial | Cosmetic Dentistry
Dental Dentures
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5.2 Bracing
 36 Stabilizing or bracing elements resist forces which might displace the denture in a horizontal plane. Such elements are represented by the vertical walls of telescoping dentures or dentures with precision attachments and by the bracing section of a clasp arm. The bracing section, or shoulder, represents that part of the clasp arm positioned above the greatest diameter of the tooth or the so called height of contour. Since teeth are to a great extent spherically-shaped, the bracing section of the clasp arm virtually always lies on a sloping surface. It is, therefore, inadmissible to design a clasp unit without a dental rest (Fig. 36). (more…) |
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5.4.2 Surveying
 44 One should begin by surveying the most anterior teeth to be clasped so that a reasonably esthetic form can be achieved. The cast should be positioned such that the retentive arm of the clasp does not traverse the middle of the labial surface, but rather, lies in relatively close proximity to the free gingival margin of the directly visible teeth (Fig. 44). (more…) |
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5.4.1 Surveying
 39 The surveying procedure should reveal how far below the height of contour the retentive arm is allowed to reach, such that it lies free of tension on the tooth surface once it has passed over the greatest circumference of the tooth, and how far below the survey line the retentive arm must lie to generate the optimal amount of retention. This measurement of how far the retentive arm may extend below the height of contour is dependent upon its length and the modulus of elasticity of the particular alloy used (Fig. 39). (more…) |
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5.3 Retention
Fig. 38
The retentive elements should work to oppose all lifting forces and hold the prosthesis in place.
Lifting forces can originate in two ways:
- directly, via sticky foods and
- indirectly, via vertical forces acting on a free-end saddle on the opposite side of a rotating axis (Fig. 38).
The retention of telescoping dentures and precision attachments is generated by friction.
The retention of a clasp arm is a measure of its flexibility. The flexion required to displace the retentive arm of the clasp from its gingival position up to the height of contour provides retention
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5.1 Dental Rests
 33 The purpose of dental rests is to distribute all vertical forces directed toward the arch onto the periodontium of healthy teeth. Dental rests also aid in maintaining the space relationship between partial denture and the remaining dentition. Bar-type attachments represent rests. The gingival shoulder or the internal occlusal surface of the secondary crown represent rests lor telescoping dentures. The floor of a precision attachment is also a rest (Fig. 33). (more…) |
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