CHAPTER 15 Impression Materials and Procedures for Removable Partial Dentures
Rigid Materials*
Metallic Oxide Paste
Metallic oxide pastes, which are rigid substances, can be used as secondary impression materials for complete dentures and for extension base edentulous ridge areas of a removable partial denture if a custom impression tray has been properly designed and attached to the removable partial denture framework (see Chapter 16).
Thermoplastic Materials*
Modeling Plastic
Some dentists still prefer to use modeling plastic as a secondary impression material to record edentulous ridges in removable partial denture fabrication. When this is done, it is generally used only as a means of building up the underside of the denture before the tissues are recorded with some secondary impression material (see Chapter 16).

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