Principles of Design and Fabrication in Prosthodontics by Hohmann Arnold & Hielscher Werner

Author:Hohmann, Arnold & Hielscher, Werner
Language: eng
Format: epub
Publisher: International Quintessence Publishing Group
Published: 2016-09-15T00:00:00+00:00

• Secure the horizontal and vertical position

• Enclose the body of the clasped tooth

• Present a fit that aids periodontal hygiene

• Meet the defined retentive force

Only the double-arm clasp with occlusal rest meets all of these requirements. Any modification of the double-arm clasp and any other form of clasp will fall short of the basic form to some extent when it comes to fulfilling these functions. However, 90% of all prosthetic cases can be treated with double-arm clasps.

The classic Ney clasp system with its five clasp types offers calculable retentive forces identical for all clasps if surveying is done properly. The differences lie in their functional quality, depending on which of the aforementioned requirements have priority or are to be ignored.

The double-arm clasp with occlusal rest is the standard design of cast clasp. It is also called an E-clasp, Ney No. 1, or Akers clasp (Fig 6-43 ). It is the simplest and most practicable form of clasp because it ensures adequate positional stability and offers rigid occlusal support. The design is also conducive to periodontal hygiene. Double-arm clasps fulfill all the tasks required of them. They are universally indicated; they can be used in small, bilateral undercut widths as well as for bounded or free-end dentures and in alternating partially edentulous dental arches.

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