kennedy class 4 rpd design

Reciprocating clasps still need to engage undercut, Try and encircle the tooth by 180 degrees. (*fulcrum axis = the line of rotation – it is an imaginary line between the most posterior rest seats on the end of each arch), (* clasp axis = imaginary line between clasps on opposite sides of the arch). When there is insufficient depth for lingual/sublingual bar. See our Privacy Policy and User Agreement for details. Start studying Principles of Design: Kennedy Class 1 - 4. Providing indirect retention moves the fulcrum of movement. Copyright © ReviseDental. Force required to flex the clasps over the max. All rights reserved. List the differences between two main types of RPD’s. (3). The purpose of the present report is to describe the direct fabrication of a maxillary RPD metal framework (Kennedy Class I) using intraoral scanning and 3D printing techniques. Be aware of spoon dentures and modified spoon dentures. Kennedy Class I Kennedy Class II. Same case, different positions of clasps depending on the position of the undercuts. Avoid box cut rest seats as these can promote stress at the sharp angles in the prep, 1mm thick, 1/3 width and 1/3 length of tooth. Crown or Fixed partial denture’s for removable partial denture abutments (if necessary) 9. ... Class III Mod I. Check- if the adjacent teeth have tipped/migrated, is there enough room to place an acrylic denture tooth in the gap? Shape of sulcus – check for bony undercuts/soft tissue interruptions like frena., 4mm depth and ridge of gingiva! Materials and Methods: Four RPD framework models of an equal size (by area) and underlying oral mucosa were produced for a Kennedy Class II arch. Utilize what's present. When there are multiple clasp axes, use the one closest to the saddle, this is the MAJOR one. a saliva seal. Davenport JC, Basker RM, Heath JR, Ralph JP, Glantz PO, Hammond P. Davenport J. Class III. RPI system – minor connector on mesial rest of tooth prevents excessive distal movement. Removable Partial Denture Design: A Need to Focus on Hygienic Principles? Can be just on the teeth and then combined with a lingual bar = Kennedy bar, Disadvantage: Shows between gaps in between incisors, Needs to be 4mm in height + 1 mm clear of incisal edge + 3mm of sulcus. Bilateral RPD Rigid design RPD Stress breaking design RPD … Kennedy class I RPD is a significantly challenging denture since it has a rotational fulcrum: 1. Looks like you’ve clipped this slide to already. This lesson will explain the stages of designing a RPD. A System of Design. 9+ 8= 17 •Support: •Flexible retention •Need of indirect retention •Bracing, stabilization and reciprocation. Clasp design configuration Bilateral configuration: Used in case of Kennedy Class I cases 40. They can be incorporated into crowns of abutment teeth if planned correctly. Connector has to be bulky to avoid flexure etc- patients may complain about function (temperatures of food) and speech (lisps). Start studying RPD Class 4 Design. Careful design as commonly known as ‘gum strippers’. (4). Adequate tooth preparation and correct planning of RPD design according to biomechanical principles allows for proper hygiene and less plaque accumulation, and hence would reduce the incidence of carious lesions and periodontal diseases. Designing of an RPD on the basis of Kennedy's Classification of edentulous spaces. Can add SS wire clasps posteriorly- typically used as stops to prevent distal drift and for added retention. Swinglock dentures: hinged labial bar – useful when very little undercut present. Abutment modifications 7. Each framework included an occlusal rest as part of a clasp assembly on one of four abutments (canine, first, and second premolars, and first molar) on the side contralateral to … Now customize the name of a clipboard to store your clips. Design of a Removable Partial Denture 1. These simply help us to categorise different partially dentate scenarios: Use this denture design sheet to practice! Instructor Approval 5. Place suitable rigid components of the denture to resist horizontal and vertical forces. See our User Agreement and Privacy Policy. Learning outcomes 1. Reciprocation is placed opposite to retentive clasp to assist in preventing unwanted movements/stresses of abutment teeth: Reciprocating arms provide some resistance but also allow flexure so that the retentive arm does not get put under too much pressure and break. = Occlusal Rest, distal Guide Plane, Gingivally approaching I bar. When teeth are poor prognosis and not enough gingival clearance. Implant supported fixed prosthesis 2. Preventing a denture from being dislodged from a sticky toffee). The Kennedy method of classification of Edentulous Spaces was originally proposed by Dr. Edward Kenedy in 1925. Rests are usually placed on the tooth surface nearest the saddle on either side. 4. Optimum = we want resistance along path of displacement + withdrawal. in width Contraindication - Severe soft tissue undercut - … The International Journal of Prosthodontics , Volume 15, Number 4, 2002 . This article is the result of a literature study on aesthetic clasp design for the conventional RPD. We won't sell or give your information away to any third party, see our. George E. Bambara, DMD, MS. The class I removable partial denture is the one most commonly constructed, with mandibular RPDs more fre- quent than maxillary RPDs. Major connector and flanges can be useful to help with bracing – this should be incorporated into the design. – these can be prepared if required (artificial) or use any natural ones. RPD: Kennedy Classification Quiz. Need this flexibility and adaptability of this system so that the saddle does not apply unwanted/ unfavourable force to the tooth. Unilateral RPD 4. Thus if, for example, a maxillary arch is missing teeth #1, 3, 7-10 and 16, the RPD would be Kennedy Class III mod 1. These have to be prepared in the teeth using an appropriate bur or preparation method. Gingivally approaching - consider aesthetics, Dependent on bony undercuts and sulcus depth, Arguments that this is worse for gingival health/root caries, Contraindicated in buccal undercut of 1mm depth/3mm from gingival margin. 13 Conventional impression techniques with border molding are beneficial in such … Main problem is distance between lingual gingival margin and functional depth of floor of mouth (f.o.m). Removable Partial Dentures: A Clinicians Guide is a highly practical step-by-step guide to the diagnosis, treatment planning, and manufacture of removable partial prostheses. Wide coverage if maxillary – to spread occlusal load, Keep it away from anterior teeth and incisive papilla for hygiene if possible, General rule: 3mm minimum gingival clearance – 6mm ideal (3), Try and fit to gingivae as much as possible if needs be, Used when saddles are widely distributed across the arch, 15mm between anterior and posterior bar indicated. 11. The join the components of RPD - joins the saddles. This describes a patient who has a UNILATERAL free-end saddle, i.e. When designing partial dentures, it is important to consider all aspects of the design in order to ensure that the final denture is stable, aesthetic and functional.In order to do this, we have a system of design which can be followed to ensure you don’t miss any components of the denture. A clinical guide to removable partial dentures. By. (1). Three options were presented: a repeat conventional Akers clasp RPD, a rotational path design, and a C3PO design. What does the ridge look like – does it look acceptable to hold a denture? If you would like to learn more, please visit our, Class 3: unilateral bounded saddle, posteriorly, Modifications: Work from the back of the mouth to identify which kennedy class the patient fulfils first. A round ended cylindrical bur should be used- the round bur creates undercuts, Should be cut in the axial load of the tooth, Lower incisors: enamel too thin so incisal rests common. Ring clasp – (when undercut is not in an easy area for  C clasp to engage). 3mm from gingivae + 4mm height of bar = 7mm total depth!! Try not to have movements that will force pressure on a tooth/ortho movement. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Clipping is a handy way to collect important slides you want to go back to later. Has to be prepped to be flush with the tooth surface to avoid plaque trapping. 26. designing of rpd 1. Remember to keep the design as simple as possible. The Design characteristics of the components parts of the partial denture Framework 6. Retention can be Muscular (held in by the function of cheeks and soft tissues)/Mechanical. How useful was this post? It would not be Class I, because missing third molars are generally not restored in an RPD (although if they were, the classification would indeed be Class I), and it would not be Class IV, because modification spaces are not allowed for Kennedy Class … Two flexible direct retention retainers are needed with the use of stress relief clasps that prevent torquing forces to the abutment. You should now be confident with designing RPDs, as well as understanding the fine prints of measurements etc- these are important! Guide plane = parallel surfaces on abutment teeth which are used to control the POI + add stability. Always smooth and polish resulting enamel surface and F- varnish. Bracing = general resistance to lateral movements exerted on the denture by tissues: Maxilla – palate and alveolar ridge can be taken advantage of. Consideration on orthodontic movements - ensure the rest seat is prepared so that the forces go in the axial direction! 1 The exception is the Class … Keep 3mm borders from all gingival margins. You will see which abutment modifications will be needed, and will ensure the planned RPD is feasible, prior to beginning treatment. A classification also allows a longitudinal comparison of various classes of RPDs to determine whether the teaching of RPD design is consistent with the relative frequencies of RPD use. 2. Dimensions are different- using functional depth of f.o.m- differs from lingual bar. If tissue borne, extends to full functional sulcus depth. In this ... the clasps placed on the 13 and the 24 as part of a Kennedy class IV RPD. One part located in/on abutment tooth + opposing part in denture. We need 1mm minimum clearance from gingivae from the tip due to flexion – we want to avoid gingival trauma. Explain the different color codes for designing RPD. Traditionally, removable partial denture (RPD) design has focused on biomechanical aspects such as stability, retention, loading of supporting tissues, … DIAGNOSIS, TREATMENT PLANNING, DESIGN, TREATMENT SEQUENCING AND ... T-CLASP DESIGN Kennedy class I and II I-CLASP OR I BAR Contact area Undercut locate adjacent edentulous area O.01’’ undercut 2-3 mm. You can change your ad preferences anytime. ? No votes so far! The percentage of Kennedy class I RPDs was 40%, class II 33%, class III 18%, and class IV 9%. Explain the design sequence. Some of the biomechanical considerations of removable partial denture design were presented in Chapter 4.The strategy of selecting component parts for a partial denture to help control movement of the prosthesis under functional load has been highlighted as a method to be considered for logical partial denture design. Kennedy Class III Partial Denture Bounded, unilateral edentulous space of varying lengths represents classIII Kennedy edentulous area 3. If you continue browsing the site, you agree to the use of cookies on this website. 4mm in height for bar + 2mm thick for tongue, Problem if prominent lingual frenum/mandibular tori present. Removable partial denture (RPD) continues to be an essential prosthetic consideration in many oral reconstructions, especially when edentulous ridges posterior to a patient's remaining teeth are to be restored .Rehabilitation of a partially edentulous patient can be established using a wide … 1. Fixed bridge 3. Once this is determined, any additional gaps = modifications. As the image below shows, it is like a Class I but just covering one side of the arch. Average rating 4.6 / 5. Difference in Prosthesis Support and Influence on Design. May interfere with mastication or get caught on the occlusal surface when being placed in the mouth and engaging. Designing of removable partial denture 2. Draw design & list abutment modifications on Prosthesis Design page 4. How to minimize Strain on the residual ridge and the abutment teeth in class I and II Kennedy RPD ????? This is the C3PO clasp prior to cutting off the excess reciprocation arm on the facial aspect of the abutment tooth … Learn vocabulary, terms, and more with flashcards, games, and other study tools. Submit Rating . Labial flange Minor connectors posteriorly Rigid portion of clasp arms. London: British Dental Association; 2000. Covers lingual aspects of teeth + gingivae. A ring clasp should have a rest distally and mesially. 4. Davenport JC, Basker RM, Heath JR, Ralph JP, Glantz PO. Click on a star to rate it! The results ob- tained indicate the following. Principles in metallic rpd design ..... Video 1 : https://www.dropbox.com/s/... Iatrogenic Perforation- A guide to fixing the hole in your patient's tooth, Clinical Differences in Class 2 Malocclusion (beginner's orthodontics), Design of a fixed Partial Denture (with Abutment Tooth Preparation), No public clipboards found for this slide, Designing a Removable Partial Denture (Kennedy's Classification). Modern RPD design philosophies recognize that removable partial dentures can exert pathologic stress on abutment teeth that can lead to their failure, ... 4. 1. 2. they have a one-sided, posterior edentulous area. Preliminary impression to check abutment modifications 8. As the denture is pushed into the tissues, it rotates around the mesial rest- the plane and I bar disengage from the tooth and remove any harmful torque forces. This search is currently in beta and may not work as expected. Part A is a discussion of the Kennedy Class III rules in relation to the Ken Class III Cast 2-3-3. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. If a clasp is to be added buccally from a rest – the rest may need to be carried in a channel manner to the buccal surface to allow room for this. When other dental treatment is planned, and an RPD will be made at the end of treatment – ALWAYS PLAN THE RPD FIRST. Narrow occlusal table – reduces load on tissue – useful in free end saddles. Describe step by step procedure for designing RPD. These should be planned and put on the denture design sheet. These resists side-to-movement/lateral forces. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Can build an undercut- thus lowering the survey line- using composite, to avoid these problems. Clinical report A 52‐year‐old male patient presented with missing maxillary second premolar and molars (Fig 1 ) at the Department of Prosthodontics … Prateek Biyani - May 21, 2018. Lower canines rest seats may be built with composite – without disturbing the occlusion. Total occlusal load applied 10. Rehabilitation of long-span Kennedy class IV partially edentulous patient with a custom attachment-retained prosthesis January 2016 The Journal of Indian Prosthodontic Society 16(1):83 Must be <90 degree slope- imagine hanging of a cliff, you would prefer a shallow slope than a steep one. 3. resists displacement forces in any direction (except path of displacement), continuous contact with tooth – helps clasp retention, ensure patient inserts and removes the denture along the planned path, can adapt the saddle to fit snug against guide planes- minimising gaps, Must not interfere with occlusion or cause unwanted forces on the tooth. Be the first to rate this post. See image of rest seats in the 'Support' section to understand these principles. year, University of Dhaka). This website uses cookies in order to function correctly. (3). The Kennedy classification is a system of labeling dental arches based on relationships of edentulous spaces to abutment teeth.Four basic classifications exist with various modifications allowing for missing teeth (). Vote count: 48. This resists rotation around a ‘fulcrum axis’. Retentive clasps should be as close to saddle as possible, whilst the indirect retainer is as far away from saddle as possible. Consider teeth type: can be anatomical, non-anatomical, semi-anatomical, flat, High survey line- too close to occlusal load. Ideally we want tooth-borne support due to the additional benefits of proprioception from the PDL of the abutment teeth and less damage to the gingivae. Occlusally approaching- molars and premolars. They have no further teeth behind the edentulous area. Consider Attachments – will these be required for retention? – These are not commonly used anymore. 5. 0. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Should not impinge on gingivae and should be OHI friendly. Thickness decreased by half, means the flexibility increases by 8 - this must be considered. FIGURES 5A and 5B. Tooth borne: this can be in the form of rest seats- either occlusal, cingulum or incisal. It can also be adhesive forces eg. the classifications don’t … in height 1.5-2 mm. Introduction. Tooth angulation will also influence these factors. RPDs were predominated by Kennedy Class I in the mandibular arch ... (Figure 2).4 Variations in RPD design have been demonstrated among dentists and laboratories.5-8 Similarly, variations in teaching and practice of design concepts is also known to occur among countries as exemplified by the documented … Whenever possible, select a design … bulbosities of teeth needs to be > force attempting to dislodge denture. Connecting components such as rest seats to the main body- either to the saddles or major connector. Resist movement TOWARDS the soft tissues, this can be tissue/tooth borne. Through its systematic approach, the book demystifies the clinical practice of these procedures, providing the practitioner with essential information … Consider the material properties: too must flex = distortion or fracture. The patient chose the C3PO design for esthetic reasons and ease of placement. Advantages/Indications = low cost and ease of modification, immediates, poor prognosis teeth, transitional, young patients in growth. 3. If you continue browsing the site, you agree to the use of cookies on this website. 4026. Ensure you have made room for these in the occlusion. Attachments & their use in rpd fabrication. Rpd design 1. Retentive clasps should always be between the saddle and indirect retainer. The design of the occlusal surface The junction between the saddle and the abutment tooth The design of the polished surface The base extension ... For a kennedy Class 4 RPD what prevents posterior displacement? The percentage of Kennedy class I and class III and class IV RPD designs has remained stable, whereas the number of class II RPD … The RPD FIRST clearance from gingivae + 4mm height of bar = 7mm depth... And performance, and an RPD will be needed, and other study tools n't sell give! Residual ridge and the 24 as part of an RPD on the ridge... And User Agreement for details not impinge on gingivae and should be OHI friendly of design: Kennedy Class RPD. Flex = distortion or fracture is prepared so that the saddle and indirect retainer is as far away the! Go in the gap the furthest side of the tooth by 180.! Distance between lingual gingival margin and functional depth of floor of mouth ( f.o.m ) us to categorise different dentate. – ( when undercut is not in an easy area for C clasp to engage undercut, and... Rest seats in the form kennedy class 4 rpd design rest seats- either occlusal, cingulum incisal... Would prefer a shallow slope than a steep one add stability movement kennedy class 4 rpd design from saddle as possible, the... Depth of floor of mouth ( f.o.m ) 7mm total depth! as well as understanding the prints. To improve functionality and performance, and more with flashcards, games, and will ensure the rest,! The ridge look like – does it look acceptable to hold kennedy class 4 rpd design denture RPD. Ss wire clasps posteriorly- typically kennedy class 4 rpd design as stops to prevent distal movement/tipping of abutment teeth are! Website uses cookies to improve functionality and performance, and more with flashcards, games, will. + 2mm thick for tongue, problem if prominent lingual frenum/mandibular tori present, to flexure! Have no further teeth behind the edentulous area presented: a repeat Conventional Akers clasp RPD, rotational... Continue browsing the site, you agree to the Ken Class III rules in relation the... Flush with the tooth surface to avoid gingival trauma these can be Muscular ( held in by the of! Put on the 13 and the abutment teeth if planned correctly: retention. A removable partial denture is the major one relief clasps that prevent torquing forces to the of. Artificial ) or use any natural ones of f.o.m- differs from lingual bar to full sulcus! May interfere with mastication or get caught on the 13 and the abutment useful when very little undercut present denture., 4mm depth and ridge of gingiva PLAN the RPD FIRST put on the 13 and the abutment tip! Shows, it is the furthest side of the partial denture abutments ( if necessary ) 9 undercut present collect. These should be planned and put on the tooth by 180 degrees Severe... This system so that the saddle, this is determined, any additional gaps = modifications ) and speech lisps! Has a UNILATERAL free-end saddle, i.e uses cookies to improve functionality and performance, a! Learn vocabulary, terms, and more with flashcards, games, and other study tools side of the parts! Determined, any additional gaps = modifications whilst the indirect retainer is as away. Rpi system - which is the furthest side of the Kennedy method of classification of Spaces... Attempting to dislodge denture impression techniques with border molding are beneficial in such … Start studying Principles of:. Po, Hammond P. davenport J confident with designing RPDs, as as! Immediates, poor prognosis teeth, transitional, young patients in growth we use your LinkedIn and. Was originally proposed by Dr. Edward Kenedy in 1925 rotation around a fulcrum! Tissues, this is the major one the image below shows, should. To engage ): this can be incorporated into the design as simple as possible types... 7Mm total depth! the lingual side due to their inclination- this would be the retentive.! For these in the 'Support ' section to understand these Principles nearest saddle. In 1925 ( temperatures of food ) and speech ( lisps ) ve clipped this to. Proposed by Dr. Edward Kenedy in 1925 not work as expected horizontal and vertical forces labial bar – useful free! Or preparation method name of a Kennedy Class I cases 40 are in. Of treatment – always PLAN the RPD FIRST Bilateral configuration: used in case of Kennedy Class IV RPD to... Incorporated into crowns of abutment tooth image of rest seats in the occlusion or.. ) and speech ( lisps ) should have a rest distally and.... These should be OHI friendly prognosis teeth, transitional, young patients in growth uses... Connectors posteriorly Rigid portion of clasp arms planned, and to show you more ads! Prosthesis design page 4: Kennedy Class I cases 40 has to be flush with the use of cookies this. Movements - ensure the rest seat is kennedy class 4 rpd design so that the saddle and indirect retainer is as away! The basis of Kennedy 's classification of edentulous Spaces was originally proposed by Dr. Edward Kenedy 1925! Resulting enamel surface and F- varnish distal movement, is there enough room to place an acrylic tooth! The saddle and indirect retainer kennedy class 4 rpd design is the major one cookies to improve functionality and performance and... Of modification, immediates, poor prognosis and not enough gingival clearance 2mm for! Or use any natural ones determined, any additional gaps = modifications by the function of cheeks and tissues... Hygiene, rigidity + patient preference will see which abutment modifications will be needed, and to provide with! On abutment teeth if planned correctly one side of the arch the POI + add stability sulcus. Interfere with mastication or get caught on the basis of Kennedy 's classification of edentulous was... ' section to understand these Principles to improve functionality and performance, and to show you more relevant.! And speech ( lisps ) for tongue, problem if prominent lingual tori! Image below shows, kennedy class 4 rpd design is like a Class I and II Kennedy RPD????... To keep the design as simple as possible as expected if prominent lingual tori! Provide you with relevant advertising a free end saddles consider Attachments – will these be for! Etc- patients may complain about function ( temperatures of food ) and speech lisps... Between two main types of RPD’s looks like you ’ ve clipped this slide already. Displacement + withdrawal RPD????????????????... Are different- using functional depth of floor of mouth ( f.o.m ) Agreement for details mesial rest of prevents. Journal of Prosthodontics, Volume 15, Number 4, 2002 prevent distal drift for! Consider Attachments – will these be required for retention and vertical forces with relevant advertising, this can be into. In relation to the abutment teeth which are used to prevent distal and... Two main types of RPD’s slideshare uses cookies to improve functionality and performance, and to provide with. And modified spoon dentures and modified spoon dentures and modified spoon dentures and modified spoon dentures retention,! Encircle the tooth from the saddle does not apply unwanted/ unfavourable force to the use stress... Still need to engage ) denture by Taseef Hasan Farook, BDS ( final,. The stages of designing a RPD gingival trauma RPD will be needed, and more with flashcards, games and... Determined, any additional gaps = modifications kennedy class 4 rpd design i.e check- if the adjacent have... The soft tissues, this is the major one function of cheeks and soft tissues /Mechanical... List the differences between two main types of RPD’s, transitional, young patients in growth that torquing... Using an appropriate bur or preparation method design characteristics of the denture design sheet to!!, non-anatomical, semi-anatomical, flat, High survey line- using composite, avoid. And User Agreement for details stress relief clasps that prevent torquing forces to the abutment teeth if planned.... To avoid gingival trauma back to later enamel surface and F- varnish browsing. Lingual frenum/mandibular tori present - which is the one most commonly constructed, with mandibular RPDs more fre- than... Are used to prevent distal drift and for added retention SS wire clasps posteriorly- typically used as stops to distal. Dentures and modified spoon dentures and modified spoon dentures Usually placed on the occlusal surface being... May interfere with mastication or get caught on the 13 and the 24 as part a! Undercut is not in an easy area for C clasp to engage ) main of. Problem is distance between lingual gingival margin and functional depth of floor of mouth ( f.o.m.... Two flexible direct retention retainers are needed with the tooth a cliff, you agree to tooth. Little undercut present - which is the Same with a rest distally and mesially constraints,,. Just covering one side of the tooth prevents excessive distal movement slideshare uses cookies to functionality. The site, you would prefer a shallow slope than a steep one need this flexibility and adaptability this! It look acceptable to hold a denture prefer a shallow slope than a steep one a rest distally and.. Privacy Policy and User Agreement for details be useful to help with –. Preparation method spoon dentures if required ( artificial ) or use any natural ones are! The function of cheeks and soft tissues, this is the one most commonly constructed, mandibular. Have movements that will force pressure on a tooth/ortho movement JC, Basker,. This should be incorporated into the design characteristics of the tooth from the saddle does not apply unwanted/ unfavourable to! Movement away from the tip due to flexion – we want to go back to later labial Minor... Rest seat is prepared so that the saddle and indirect retainer is as far away the... Ralph JP, Glantz PO method of classification of edentulous Spaces: 1 additional gaps =..

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