58. Special retainers: precision and semi-precision attachments.
Explains what precision and semi-precision attachments are: connectors with a male patrix in the denture and a female matrix on an abutment, usually within a crown. Compares the two types by manufacture, fit, wear and cost, then sets out intracoronal, extracoronal, stud and bar groups. Also classifies attachments by the movement they allow, lists indications, contraindications, advantages and disadvantages, and notes the shared path of insertion.
Topic 58 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 6 sections, about 112 words (2 min of reading), with 13 flashcards.
In this note
Introduction
Precision and semi-precision
Where they sit
How much they let the denture move
Indications and contraindications
Advantages and disadvantages
Introduction
An attachment is a connector of two or more parts that lock together: one part (the matrix, female) is fixed to an abutment, usually inside or on a crown; the other (the patrix, male) is built into the removable denture. Attachments replace visible clasps and give precise retention and bracing.
How much they let the denture move
Rigid attachments allow no movement: for tooth-supported dentures (Kennedy Class III) and fixed connections.
Resilient attachments let the denture sink or rotate toward the mucosa under load: for free-end dentures, so the abutment isn't twisted.
Advantages and disadvantages
Every attachment in a denture must share one path of insertion. They are placed with a surveyor or milling machine, and abutments carrying attachments are often splinted.
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