11. 6. Name the component or components which provide reciprocation in the RPI clasp assembly. RPD Design – Wrought Wire Retainers (Brudvik) Guides for its application:  If the distance from its origin when it leaves the acrylic resin base is 7mm or less use PGP wrought wire clasp gauge # 20  If the distance from its origin when it leaves the acrylic resin base is greater than10mm use PGP wrought wire clasp gauge 18  For I-bar clasp: Use PGP wrought wire clasp gauge #19, 40. 2) In kennedy class II cases … Indications for RPD - edentulous area too long to fixed prosthesis (longer than 4 units) - no posterior abutment for fixed prosthesis - excessive alveolar bone loss (esthetic problem) Fig. Other RPD designsConventional Akers design – Distal rest with a cast circumferential retainer When an occlusal force in delivered in the edentulous extension area the RPD rotates around the distal rest, the retainer engages and the tooth and is tipped distally, 33. eCollection 2020. The patient who has paid for an RPD to restore compromised function or esthetics is unable to wear the unsuccessful appliance, so it is left in a drawer, and the patient increasingly does more dental damage to the remaining natural dentition. Extension Based RPD’sPositioning the axis of rotation to idealize support in the edentulous area In this example when the rest is placed on the distal side of the abutment adjacent to the edentulous extension area the forces delivered are not vertical but almost horizontal in region just adjacent to the abutment Occlusal force Axis of rotation (rest), 15. Retentive clasps should always be between the saddle and indirect retainer ; Retentive clasps should be as close to saddle as possible, whilst the indirect retainer is as far away from saddle as possible. NLM 2015 Dec;71(Suppl 2):S306-12. Extension Based RPD’s Design and positioning of the retainer Positioning the retainer posterior to the rest produces a downward and forward movement of the retainer further into the undercut disengaging the retainer and preventing the tooth from being exposed to tipping forces, 22. Pressure is applied in the extension areas. This clasp assembly provides benefits of the RPI clasp and can be used in clinical situations where the RPI clasp is contraindicated. 13. Your time ticket will be sent to your RPI email address, 2 - 3 weeks before registration. 37. Flexible clasps 42. Designing RPD’s Planning sequence for RPD patients Diagnostic assessment and preliminary impressions Diagnostic casts mounted in centric relation Draw the ideal RPD design (on paper) Survey the study casts and determine the most advantageous position (MAP) of the designed RPD path of insertion and withdrawal Revise and finalize the RPD design, 41. doi: 10.1016/j.mjafi.2012.08.020. • Acetal resin clasps are esthetic and are available in sixteen different shades. Therefore RPD’s are displaced and move during function. Basically, this clasp assembly consists of a mesioocclusal rest with the minor connector placed into the mesiolingual embrasure, but not contacting the adjacent tooth. Clipboard, Search History, and several other advanced features are temporarily unavailable. d. Issues addressed include indications for use and the basic principles of design for each system. 2012 Jun;21(4):331-3. doi: 10.1111/j.1532-849X.2011.00823.x. Previous research papers indicate that there was a lack of data concerning the correct selection of clasps when designing RPDs. Figure 4. Types of Partial DenturesExtension base partial, 9. Types of Partial DenturesExtension base partial dentures  Position of the rests determine axis of rotation (fulcrum line)  The axis of rotation traverses through the most posterior portions of the rests adjacent to the edentulous area. Epub 2015 Jun 23. 12mm clasp on right bent beyond its proportional limit 11 . HHS The retainer will then disengage when an occlusal force is applied to the edentulous extension, 25.  |  Extension Based RPD’sPositioning the axis of rotation to provide the best support for the edentulous area Occlusal force Axis of rotation (rest) As a result little or no vertical support is obtained from edentulous area immediately distal to the abutment tooth, 16. Types of Partial DenturesTooth borne  Rests can be placed in any position as long as they direct occlusal forces along the long axis of the abutment tooth  Exception: When distal abutment is suspect  Stability, bracing and support should be maximized  Virtually all of the support derived from the abutments. Designing RPD’s Planning sequence for RPD patients Diagnostic assessment and preliminary impressions Diagnostic casts mounted in centric relation, 42. St. Louis: Mosby. stability (resistance to lateral forces), and support for all the teeth remaining in the arch  Ideally and when the occlusion permits rests should be extended into the middle of molar teeth, 6. The principle focus is directed toward extension based removable partial dentures. partial denture and the other units of the prosthesis, such as the clasp assembly, indirect retainers, occlusal rests, or cingulum rests.” The Academy of Prosthodontics (1999). Glossary of Prosthodontic Terms (7th ed).  Visit ffofr.org for hundreds of additional lectures on Complete Dentures, Implant Dentistry, Removable Partial Dentures, Esthetic Dentistry and Maxillofacial Prosthetics. The lectures are free. Our objective is to create the best and most comprehensive online programs of instruction in Prosthodontics. Try not to have movements that will force pressure on a tooth/ortho movement. c-Proximal plate contacts approximately 1 mm of the gingival portion of guiding plane. 1993 Jun;2(2):126-31. doi: 10.1111/j.1532-849x.1993.tb00394.x. USA.gov. RPD Design Philosophies RPI System (UCLA-Kratochvil) Mesial restRest Proximal plateProximal plate“I”-bar Tooth tissue junction “I” Bar, 3. Owen's Fundamentals of RPD ). The mandibular first premolar as an abutment for distal-extension removable partial dentures: a modified clasp assembly design. The circumferential-type retentive arm is easier to grasp for removal of the prosthesis. Figure 3. embrasure claps. Clinical application of removable partial dentures using thermoplastic resin-part I: definition and indication of non-metal clasp dentures. J Prosthodont. 12. © 2020 Foundation for Oral-facial Rehabilitation. Why is a circumferential clasp undesirable for a distal extension situation. 2016 Jul;25(5):411-3. doi: 10.1111/jopr.12313.  |  Ring clasp. Extension Based RPD’s Design and positioning of the retainer If the axis of rotation is placed between the retainer and the edentulous extension area, the retainer moves upward, engaging and torquing the tooth when an occlusal force is applied in the edentulous extension area. Rest, Proximal plate and I bar Rest, Proximal plate and Aker’s clasp 19. Extension Based RPD’s The rotation should be pure. Distal extension abutments to engage a distobuccal (adjacent to edentulous space) undercut. All the components of the I-bar assembly were modified significantly to fulfill Krol’s design. 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