Explains how an acrylic resin partial denture held by bent wire clasps is designed and made, covering when it is chosen, its advantages and disadvantages in a comparison table, and the key design rules for the base, clasps and rests. It then walks through the technological steps from alginate impressions and surveying to flasking, dewaxing, heat curing and finishing, with a twelve-step illustration.
Topic 62 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 4 sections, about 323 words (3 min of reading), with 14 flashcards.
In this note
Introduction
When it is chosen
Designing it
Technological steps
Introduction
The acrylic resin partial denture with wrought wire clasps is the simplest removable partial denture: a pink acrylic base carrying the teeth, held by bent wire clasps. It rests mainly on the mucosa. It is quick, cheap and easy to repair, add teeth to or reline.
When it is chosen
As an interim or immediate denture while extraction sites heal or before a definitive denture.
When the remaining teeth have a doubtful prognosis and more extractions may follow: teeth are easy to add.
For frail, elderly patients, or when cost or limited cooperation rule out a cast framework.
At least two natural teeth remain in the jaw to anchor it.
Designing it
Base extended as widely as tolerated for support and stability, but relieved from the gingival margins (at least 3–4 mm in the lower jaw where possible).
Clasps on abutments with suitable undercuts, retentive tips placed below the survey line, usually on the buccal side.
Bent wire rests, when added, stop the denture sinking onto the gingiva.
In the lower jaw the lingual flange must be thick enough not to break, which makes the denture bulkier than a metal framework.
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