12. “ I” Bar Retainers Design Principles A space is created between “I” bar and mucosa (it is crossing over) to prevent tissue hypertrophy (arrows). Ideally “I” bar terminates in gingival 1/3 of the tooth. An active “I” Bar requires only 0.25 mm undercut. 13.

Mar 18, 2013 · This document discusses the components and design of an I-bar removable partial denture (RPD). It begins by defining RPI, which stands for rest, plate, and I-bar clasp. It then describes the key components of an I-bar RPD including mesial rests, proximal plates, and a modified I-bar retainer called the RPI system developed by Krol.

Oct 5, 2020 · Stress releasing clasp assemblies include: The RPI is a current concept of bar clasp design that refers to the rest, proximal plate, and I-bar component parts of the clasp assembly. Distal extension abutments to engage a distobuccal (adjacent to edentulous space) undercut.

Modern removable partial denture designs anticipate and accommodate the movement of the prosthesis during function so as to minimize the torquing forces delivered to the abutment teeth. The RPI, RPA and wrought wire RPD systems are discussed. Issues addressed include indications for use and the basic principles of design for each system.

Study with Quizlet and memorize flashcards containing terms like Alternatives in prosthodontics for partially edentulous patients;, What is the biggest concern about I-Bar RPD design philosophies?, 3 Important components of I-Bar RPD: and more.

Feb 24, 2018 · This document discusses the components and design of an I-bar removable partial denture (RPD). It begins by defining RPI, which stands for rest, plate, and I-bar clasp. It then describes the key components of an I-bar RPD including mesial rests, proximal plates, and a modified I-bar retainer called the RPI system developed by Krol.

Jan 1, 1979 · The I-bar retainer is smoothly tapering, flexible, travels horizontally on attached tissue, and turns to cross the tooth-tissue junction at a right angle. The I-bar provides retention (r) near, but not directly at, its terminus.

Jun 1, 2021 · The analytical model based on mechanical laws was established to simulate I-bar clasp retention, and optimize its design. The model considered the lengths of the vertical (L 1) and horizontal (L 2) arms of the I-bar as well as the radius (r) of its half-round cross-section.

The objective of this study was to create an analytic model of I-bar clasps for computer-aided design (CAD)-RPD. Methods: The analytical model based on mechanical laws was established to simulate I-bar clasp retention, and optimize its design.

The mesial rest-I-bar concept is the most important contribution to clasp partial denture design in the last 30 to 40 years. When used with discernment in situations where it is not contraindicated, it constitutes an excellent design for extension-base removable partial dentures.