19
Partial denture base materials
Figure 19.1 Cast Vitallium removable partial denture. (Courtesy of Dentsply International.)
Figure 19.2 Removable partial denture with a metal base mounted on a cast, showing the acrylic gumwork, prosthetic teeth, and the denture clasps positioned on the abutment tooth.
Figure 19.3 Corrosion and surface tarnishing of a chromium-cobalt removable partial denture framework due to the action of a hypochlorite-containing denture cleanser.
Figure 19.4 Flexible resin partial denture. (Lucitone FRS, courtesy of Dentsply International.)
Table 19.1 Base metal casting alloys
Table 19.2 Mechanical properties of partial denture alloys
Table 19.3 Physical properties of flexible partial denture materials
A removable partial denture (RPD) is a dental prosthesis that replaces one or more teeth and the associated structures of the maxilla or mandible. The prosthesis comprises artificial teeth attached to a base that is supported through contact with the underlying oral tissues or implants and attached to abutment teeth with clasps or precision attachments. The denture base or framework may be fabricated from metal or a resin. Denture teeth are discussed in Chapter 20.
19.1 Metallic RPDs
Most dentists and prosthodontists favor the use of a metal alloy partial denture framework with acrylic resin (PMMA) “gumwork” and either resin or porcelain prosthetic teeth (Figure 19.1). The use of a metal framework ensures the rigidity of the RPD base, reducing the risk of damage from flexure of the denture to the gingival cuff surrounding the abutment teeth.
Metal partial denture frameworks are commonly cast from nickel-chromium />
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