1. The retaining abutments are large enough for adequate tooth reduction for the attachment female to be incorporated into a normal crown contour.
2. Strong or multiple abutments exist as the forces are directed to the retaining abutments.
3. A stable occlusal table is desired.
4. Often opposing either a full denture or a bilateral free-end removable partial denture.

Intracoronal precision attachments are normally rigid or non-resilient directing forces down the long axis of the retaining abutments. Therefore, multiple abutments are common. Intracoronal rigid attachments provide for a more stable occlusal table and removable prosthesis.

FR Attachment

The FR system for removable partial dentures is a technological revolution for what many call semi-precision or "mill-ins." A tapered, friction retained intracoronal precision attachment for removable partial dentures with a lingual arm and for segmented bridgework or non-parallel abutments in fixed bridgework. The female is actually cast against the prefabricated male for total accuracy, improved proximal wall contacts, and tremendous time and labor savings. This simple and inexpensive attachment uses a single investment technique, eliminates porcelain in the female due to the silicone male, allows for easy and accurate duplication, no soldering is needed, easy separation of male and female, and the miniature size allows for use in ‘close bite’ situations. Easy insertion because of the tapered male, improved esthetics (no metal on the occlusal), excellent retention and reduced wear account for this being one of the most popular attachments in dentistry.

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UNOR 10802

UNOR Instructions

Not available

The UNOR is a screw adjustable retention precision attachment for intracoronal use. The beveled male is adjustable so retention may be either increased or decreased, allowing for easy patient insertion and removal, thus less wear. Vertical height may also be altered for short or ‘close bite’ situations. The female may be directly cast with precious or semi-precious alloys for easy fabrication. A female ceramic former is available for creating a female in non-precious castings. The excellent external wall contact allows for guide plane stability. The male may be connected to the cast frame by acrylic resin, composite resin, or solder. The system also allows for conversion of a fixed bridge to a removable partial denture if distal abutments are lost.

UNOR 10802