Biomechanics have changed the world of sport for the better they make the difference of whether you are going to be able to play again or not. 43. As a result these prosthesis move or rotate during function. Test. Clinical significance: If the RPD designs do not conform to this idea there is risk that abutment teeth may be overloaded leading to their premature loss. Principles of RPD design 5. This article provides a review of the traditional clinical concepts for the design and fabrication of removable partial dentures (RPDs). RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) Courtesy Dr. A. Davodi, 36. Journal of Royal Science. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) (dotted line) When and occlusal force is applied: The prosthesis rotates towards the mucosa on the extension base side of the fulcrum line All parts of the RPD framework on the dentate side rotate away from the dentition, 31. Types of Removable Partial Dentures Tooth borne – Essentials of the design Rests on molar teeth should be placed in the center of the tooth Guide planes as parallel as possible Enhance stability (bracing) unilaterally and bilaterally (cross arch stabilization) to resist lateral forces Enhance retention, 8. However when we try to create an … Designs must anticipate these movements of the RPD during function to prevent overload and loss of the abutment, 16. Computational modeling and validation of human nasal airflow under various breathing conditions. Biomechanics is the study of the structure and function of biological systems such as humans, … Share This Article: Copy. Modern RPD design philosophies recognize that removable partial dentures can exert pathologic stress on abutment teeth that can lead to their failure, particularly in extension based RPD’s.  This program discusses the impact of rest position, retainer position and design, and  indirect retention on the biomechanics removable partial dentures. The bone beneath does not resorb secondary to the pressure associated with denture use. biomechanics of RPD. Biomechanics ofRemovable partial denture. Two methods: Altered cast impressions Fully extended impressions with a custom tray. 6. It is one of the two primary support areas of the mandible . Extending the rest across the transverse ridge may weaken the tooth Courtesy Dr. G.E. The primary aims of the Journal “Series on Biomechanics” are to provide a means of communicating the advances being made in the areas of theoretical and applied biomechanics highlighting the interface with other multidisciplinary fields and with up-to-date technologies. All parameters except PD suggested that glaucoma modified the effect of myopia on corneal biomechanics. They are entitled: Biomechanics: Mechanical Properties of Living Tissues; Biodynamics: Circulation; and Biomechanics: Motion, Flow, Stress, and Growth; and this is the first volume. © 2020 Foundation for Oral-facial Rehabilitation. June 5, 2018 | In laboratories across the University of Delaware, scholars are uncovering new insights about the human body: how a compound in red wine might protect joint cartilage from damage, how bad posture wears down the discs in your back, how your knee heals after an anterior cruciate ligament (ACL) tear, and more. Juvenile red snapper settle across several complex habitats, which function as nurseries for young fish. Biomechanics help with sporting injuries, along with kinesiology they have changed the game and took it to another level. Distal extension removable partial denture prosthesis /certified fixed orthod... No public clipboards found for this slide. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The lectures are free. 3. Spell. Volume 64, November 2017, Pages 59-68. STUDY. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission. Background Resilience of midsole material and the upper structure of the shoe are conceptual characteristics that can interfere in running biomechanics patterns. CiteScore: 4.7 ℹ CiteScore: 2019: 4.7 CiteScore measures the average citations received per peer-reviewed document published in this title. 1. stability (resistance to lateral forces), and support for all the teeth remaining in the arch Ideally and when the occlusion permits molar rests should be extended into the middle of the teeth, 9. action on longitudinal axis . These displacement forces must be taken into consideration during the design analysis process. Extension Based RPD’s If the denture base is underextended the alveolar ridge will rapidly resorb During mastication or parafunction (clenching and bruxing) the periosteum is compressed, the underlying bone subjected to stress and strain, and a resorptive remodeling response is provoked. King, 12. Types of Removable Partial Dentures Tooth borne The removable partial denture should provide greatest possible bracing ie. A new study finds that the extinct European cave bear’s large sinuses represent a tradeoff between hibernation length and the flexibility of their diets. Learn. Principles of RPD design 2. Note that the proximal plate on the mesial of the premolar provides reciprocation for the retainer as well as stability Advantages: Axis point is lower on the tooth The rest is further away from the edentulous bearing surface resulting in the occlusal forces delivered in a more vertical direction to the extension base, 34. Igor V. Pivkin, Zhangli Peng, George E. Karniadakis, Pierre A. Buffet, Ming Dao, Subra Suresh. sup1, p. 33. If you continue browsing the site, you agree to the use of cookies on this website. CiteScore values are based on citation counts in a range of four years (e.g. Principles of RPD design 3. Maximum support is gained from the adjacent soft tissue denture bearing surfaces . longitudinal axis. vertical movement by vertical dislodging and seating forces ex: chewing sticky food. When lateral trunk tilt occurs early in the delivery, there are several factors that may contribute. The buccal shelf is a prime support area because it is parallel to the occlusal plane . RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) for an anterior base extension RPD, 37. Design considerations for a distal extension rpd/prosthodontic courses. Masseter groove area Buccinator limits the extension in this area, 22. Like any other science, biomechanics advances by the development of theories and the testing of these theories by observation and experiment. Rests on the mesial of teeth adjacent posterior extension area Rests on the distal of teeth adjacent to anterior extension area Courtesy Dr. A. Davodi, 51. Biomechanics is a branch of biophysics. In the oral cavity one would find a number of sources of stressgeneration, the human body is built in such a manner that it learns to adapt to any stressful situation. King, 7. This study examined if colored foot insole would influence perceived comfort and lower extremity biomechanics during drop landing. RPD Biomechanics Extension base RPD’s This patient presents with both anterior and a posterior edentulous extension areas Courtesy Dr. A. Davodi, 15. Gait kinematics and kinetics of the knee before and after medial patellofemoral ligament (MPFL) reconstruction in patients with recurrent lateral patellar dislocation (RPD) are unknown. Extension Based RPD’s With improper designs movement of the denture base during mastication or parafunction is destructive to the underlying bone and soft tissue, 18. FFOFR is a tax-exempt public charity under 501 (3)(c), Foundation for Oral-facial Rehabilitation, Complete Dentures – Record Base and Wax Rim Fabrication, Removable Partial Dentures – Retainers, Clasp Assemblies and Indirect Retainers, Complete Dentures – Anatomy of the Denture Foundation Areas, Removable Partial Dentures – Surveyed Crown & Combined Fixed RPD’s, Fixed Prosthodontics – Tooth preparation guidelines for complete coverage metal crowns, Complete Dentures – Maxillo-Mandibular Relation Records, 8. Types of Removable Partial Dentures Tooth borne – Rests When the rests extend to the middle of the tooth the forces are directed down the long axis of the abutment (arrows), 11. Such retainers should be placed at the height of contour, 42. longitudinal axis is. Research in biomechanics was started by Leonardo da Vinci, who studied human movements from the standpoint of anatomy and mechanics. Artificial intelligence techniques can capture features from the entire waveform, adding new perspective for biomechanical analysis. Biomechanics also makes use of techniques of electrical recording of mechanical quantities by means of mechanotrons, sensors of angular movements, and support dynamographs. Computer Methods in Biomechanics and Biomedical Engineering, Vol. Gravity. Myopia had a significant impact on corneal biomechanical properties in the … The rest was positioned here because the premolar was periodontally compromised. Principles of support stability and retention in complete dentures. Biomechanics of RPD. body weight and external environment) and internal forces (e.g. Requirements of a Removable Partial Dentures Provided by : Support Cingulum rests Extension base Major connector Retention Direct “ I” bars on cuspids Proximal plates (when parallel) Indirect Cingulum rests on incisors Stability Minor connectors-proximal plates Lingual plate on anterior teeth Cingulum rests Reciprocation Minor connectors Cingulum rests Proximal plates, 46. RPD Biomechanics Extension base RPD’s Anterior extension RPD Posterior extension RPD, 14. RPD Biomechanics Extension base RPD’s Position of the retainer From occlusal view, the retainer is placed at the point of greatest mesial-distal curvature of the tooth If the retainer is placed behind the greatest curvature the retainer will move forward during function and torque the tooth and loosen the retention Extension base Point of greatest mesial distal curvature, 40. fulcrum line (horizontal axis) line connecting most posterior abutment teeth or abutments. The date an article was first made available online will be carried over. Biomechanics, in science, the study of biological systems, particularly their structure and function, using methods derived from mechanics, which is concerned with the effects that forces have on the motion of bodies. Computer Methods in Biomechanics and Biomedical Engineering, Vol. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area The thickness and compressibility of the supporting mucosa The adaptation of the denture base to the tissues of the extension base Refinement of the occlusal factors (distal extension RPD’s) Anterior guidance – Centric only contact posteriorly, 17. As of this date, Scribd will manage your SlideShare account and any content you may have on SlideShare, and Scribd's General Terms of Use and Privacy Policy will apply. Read the latest articles of Clinical Biomechanics at ScienceDirect.com, Elsevier’s leading platform of peer-reviewed scholarly literature You may also scan the code on the first page of this article with your smartphone to be taken directly to ... Rhodamine-labeled α-bungarotoxin demonstrates numerous motor end plates (red). Principles of RPD design 6. RPD Biomechanics Extension base RPD’s This patient presents with both anterior and a posterior edentulous extension areas Therefore, depending on the anterior arch form, there will be two axis of rotation as shown depending whether the patient is incising with the anterior teeth or chewing with the posterior teeth Courtesy Dr. A. Davodi, 38. Extension Based RPD’s Indirect retention When a dislodging force is applied the prosthesis will rotate around the posterior retainers. Urbanovich was a student of the first class of the Higher State Theatre Workshops. Proceedings of the National Academy of Sciences Jul 2016, 113 (28) 7804-7809; DOI: 10.1073/pnas.1606751113 . It is composed of dense cortical bone and is relatively resistant to resorption. Principles of RPD design Extension base RPD designs must anticipate and accommodate the movements of the prosthesis during function, without exerting pathologic stresses on the abutment teeth Major connectors must be rigid. These stress forces during function include dislodging, horizontal, torsional, and vertical displacement forces. See our User Agreement and Privacy Policy. Occlusal rest must direct occlusal forces along the long axis of the teeth. Flow of concentrated red blood cell suspensions at micro-bifurcations: anin vitroexperimental study. In this case, we can explore what the root cause of the excessive trunk tilt is. Forces acting on Removable Partial Dentures Vertical (dislodging) Forces of gravity in maxillary RPD’s Sticky foods Vertical (seating) Forces of occlusion Horizontal (lateral) During the chewing cycle The object of RPD design is to counter these forces without stressing the abutment teeth and the edentulous soft tissue denture bearing surfaces beyond their physiologic tolerance. Guide planes are created to enhance stability and bracing. TASEEF HASAN FAROOK, BDS (final year) 2. Created by. Extension base RPD designs must anticipate and accommodate the movements of the prosthesis during function, without exerting pathologic stresses on the abutment teeth. a short presentation on the biomechanics in Removable Partial Denture.... a very important topic to be understood completely for easy designing of cast framework and also to know the problems in already treated conditions. action on fulcrum line. Extension Based RPD’s In a posterior tooth the rotation occurs through the depest portion of the rest . If you continue browsing the site, you agree to the use of cookies on this website. active forces generated by muscle contraction and passive forces exerted on local structures by bones and joints) and the resultant effect of these forces on body movement. Retention must be within the limits of physiologic tolerance of the periodontal ligament. Unilateral Bilateral, 13. Percentage differences in the adjusted myopic effect between POAG and nonglaucoma patients was 31.65, 27.27, 31.65, 50.00, 22.09, and 60.49 for CDA, ICA, OCA, ICV, OCV, and radius, respectively. This study tested the influence of shoe midsole resilience and upper structure on running … An extension base RPD of the Mandible must cover the buccal shelf and the retromolar pad, 19. 3. Principles of RPD design 4. 20. The cingulum rest stabilizes the framework during swallowing and tongue thrusting, 41. You can read or watch the videos, it's up to you! Problems associated with denture wearing and problems associated with aging. Types of Removable Partial Dentures Tooth-Mucosa borne (extension base) Exhibits one or more edentulous areas which are not bordered by abutment teeth Functional forces are shared by both the abutment teeth and denture bearing surfaces in the extension. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) The tip of the rest on molar is contoured in a half circle This permits a proper rotation around the axis of rotation, 39. Biomechanics is the study of the structure, function and motion of the mechanical aspects of biological systems, at any level from whole organisms to organs, cells and cell organelles, using the methods of mechanics. Retention must be within the physiologic tolerance of the periodontal ligament RPI system RPA system Wrought wire, 55. Occlusal rests must be positive and direct occlusal forces along the long axis of the teeth, 53. However, recent studies have shown higher growth rates for juveniles located on mud habitats adjacent to low profile reefs, perhaps because of varied prey availability and abundance. The axis runs through the deepest portion of posterior rests, 27. PLAY. Image of the Day: Foot Biomechanics. sup1, p. Extension Based RPD’s – Retromolar Pad One constant, relatively unchanging structure on the mandibular denture bearing surface is the retromolar pad (dotted line). Removable Partial Dentures – Surveyed Crown & Combined Fixed RPD’s 415 views MAXILLOFACIAL PROSTHETICS 390 views Fixed Prosthodontics – Tooth preparation guidelines for complete coverage metal crowns 359 views imaginary line formed by crest of residual ridge. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) (dotted line) When and occlusal force is applied: The prosthesis rotates towards the mucosa on the extension base side of the fulcrum line All parts of the RPD framework on the dentate side rotate away from the dentition; 31. Encajonamiento de la Impresion y Vaciar el Modelo, 15. conceptos de oclusion esquemas oclusales. Image of the Day: Bear Sinuses. Conclusions. Biomechanics ofRemovable partial denture 2. Tooth Borne RPD – Molar rests When the rest is placed on a marginal ridge of a molar, the bone associated with th root on that side becomes overloaded When the rest extends into the center of the tooth the forces are more equitably distributed in the alveolar bone Photoelastic model, 10. 21. Match. PLAY. The purpose of this paper is to analyse contemporary biomechanics research by providing a critique of the development of biomechanical theories. Articles in press are peer reviewed, accepted articles to be published in this publication. 16, Issue. The most cited articles published since 2017, extracted from Scopus. Designs must consider the needs of cleansibility. Flashcards. Biomechanics is the study of the structure, function and motion of the mechanical aspects of biological systems, at any level from whole organisms to organs, cells and cell organelles, using the methods of mechanics. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) The RPD rotates around that portion of the rest that is closest to the extension base area Extension base, 35. King Courtesy Dr. G.E. Biomechanics is the study of the structures and materials of human, plant, and animal life and the effect of external stimuli upon those systems. Altered cast impressions for extension base partial dentures. Biomechanics in removable partial denture 1. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. RPD Biomechanics Two types of RPD’s Tooth borne Occlusal forces are transmitted to the teeth used as RPD abutments Extension base Occlusal forces are shared between the abutment teeth and the edentulous denture bearing surfaces. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area The thickness and compressibility of the supporting mucosa The adaptation of the denture base to the tissues of the extension base Refinement of the occlusal factors (distal extension RPD’s) Anterior guidance – Centric only contact posteriorly Maximize the surface area and cover key anatomic structures with altered cast impressions, 25. Parallel guide planes for stability and bracing, 54. When the final article is assigned to volumes/issues of the publication, the article in press version will be removed and the final version will appear in the associated published volumes/issues of the publication. See our Privacy Policy and User Agreement for details. 49. RPD Biomechanics Extension base RPD’s By changing the position of the rests you idealize the forces delivered to the extension areas and minimize the movement of the extension base Most favorable support in the extension areas is provided when the forces are delivered at right angles to the edentulous bearing surfaces Edentulous extension area, 32. We do see 48 degrees of lateral trunk tilt at ball release, which in our last biomechanics article we found could be linked with higher torques on the arm. Together, journal articles in a particular field are often referred to as The Literature. biomechanics in rpd 1. Extension Based RPD’s – Buccal Shelf Boundaries of the buccal shelf: The external oblique line and the crest of the alveolar ridge (area within the dotted lines). 5. Biomechanics of red blood cells in human spleen. RPD Biomechanics John Beumer III and Ting Ling Chang DDS Section of Removable Prosthodontics UCLA School of Dentistry This program of instruction is protected by copyright ©. Requirements of a Removable Partial Dentures Provided by: Retention Direct “ I” bars Proximal plates Indirect Rests – incisal and occlusal Lingual plate Stability (Bracing) Minor connectors and proximal plates Lingual plate Incisal rest Buccal “I” bar on molar Support Rests Extension base Reciprocation Minor connectors Lingual plate Proximal plates Buccal “I” bar on molar. The pad contains glandular tissue, loose areolar connective tissue, the lower margin of the pterygomandibular raphe, fibers of the buccinator, and superior constrictor and fibers of the temporal tendon. The purpose of this study was to measure knee kinematics and kinetics during gait before and 1 year after anatomical MPFL reconstruction in patients with RPD and compare the results to healthy individuals. Biomechanics is the study of the structure and function of biological systems such as humans, animals, plants, organs, and cells by means of the methods of mechanics. Learn more. 1. Red is perceived as a “winning color”, which may influence actual and perceived performances in sports, but little effort has been done to assess the added value on colored foot insoles in basketball movements. Amy Schleunes | Apr 10, 2020. STUDY. 44. JAB is published bimonthly, and contains original research articles, technical notes, computational model articles, review articles, target articles, and book reviews. RPD Classification Systems UCLA – Kratochvil system Based on biomechanics Three types Tooth borne Extension base Unilateral Bilateral Periodontal Stabilization Kennedy – Applegate system Based on edentulous spaces, 4. Types of Removable Partial Dentures Tooth borne Abutment teeth border all edentulous areas Functional forces are transmitted through the abutments to bone It functions like a fixed partial denture Courtesy Dr. G.E. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area The thickness and compressibility of the supporting mucosa The adaptation of the denture base to the tissues of the extension base Refinement of the occlusal factors (distal extension RPD’s) Anterior guidance – Centric only contact posteriorly This practice will reduce the lateral forces delivered, 26. The mechanics prerequisite for all three volumes remains at the level of my book A First Course in Continuum Mechanics (3rd edition, Prentice-Hall, Inc. , 1993). Therefore RPD’s are displaced and move during function. Terms in this set (19) the horizontal axis is = fulcrum line a line connecting the most post abut teeth/principal abuts - vertical movement by vertical dislodging and seating forces - chewing sticky food . Our objective is to create the best and most comprehensive online programs of instruction in Prosthodontics. Shortly after beginning his studies, he started teaching biomechanics and acrobatics himself. Submit. INTRODUCTION Biomechanics basically deals with application ofmechanical principles to biological tissues. Amy Schleunes | Mar 2, 2020 . Extension Based RPD’s When and occlusal force is applied in the denture base extension region: The prosthesis rotates towards the mucosa on the extension base side of the axis of rotation (fulcrum line) All parts of the RPD framework anterior to the axis of rotation (fulcrum line) rotate away from the dentition, 29. Little is known about their life history or feeding biomechanics during this time. 16, Issue. History of biomechanics. 15th annual symposium highlights biomechanics research at UD. Application of mechanical principles on biological tissues while studying the biology from a functional viewpoint and then using these principles to design a stable prosthesis. Biomechanics relationship between external forces (e.g. If more than one space is present in the dental arch it would fall into one of the other classifications. Scribd will begin operating the SlideShare business on December 1, 2020 What is Biomechanics in Prosthodontics? 2. Reprinted with permission from McCord CD Jr, Codner MA. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area The compressibility of the bearing surface tissues Therefore, we must maximize the coverage of the edentulous extension area with fully extended impressions. Now customize the name of a clipboard to store your clips. Write. Visit ffofr.org for hundreds of additional lectures on Complete Dentures, Implant Dentistry, Removable Partial Dentures, Esthetic Dentistry and Maxillofacial Prosthetics. Most Cited Journal of Biomechanics Articles. 56. Biomechanics Journal Article is sometimes called a Scientific Article, a Peer-Reviewed Article, or a Scholarly Research Article. Therefore this portion of rest should be contoured as a half sphere We develop this portion of the rest with a #6 or a #8 round burr Proper rest contour, 28. RPD Biomechanics Extension base RPD’s By moving the rest towards the mesial the forces are applied more vertically in the edentulous extension areas As a result there is less rotation around the axis of rotation (fulcrum line) Edentulous extension area, 33. To understand the variables in RPD design or form, we must consider function first. Requirements of a Removable Partial Dentures Provided by: Retention Direct “ I” bars Proximal plates Indirect Cingulum rests Stability Minor connectors and proximal plates Lingual plate on molar Rests Support Rests Extension base Major connector Reciprocation Minor connectors Lingual plate Proximal plates, 47. Tweet Widget; Facebook Like; Mendeley ; Table of Contents. During function of an RPD, the prosthesis undergoes different types of stress. Etymology. This article contains 31 videos, 42 studies, + articles about anatomy, biomechanics, individualization, physics, and exercise technique. Principles of RPD design 7. 50. Extension Based RPD’s Challenge Mucosal bearing surfaces are compressible. Clipping is a handy way to collect important slides you want to go back to later. Requirements of a Removable Partial Dentures Design based on : Support Rests Major connectors Denture bases Stability (bracing) Minor connectors Proximal plates Rigid portions of retainers Lingual plates Denture bases Rests Retention Direct retainers, 45. 57. Looks like you’ve clipped this slide to already. Designs must consider the needs of cleansibility and food flow patterns. Types of Removable Partial Dentures Tooth borne- Rests When the rest extends to the middle of the tooth the forces are directed down the long axis of the tooth We confine the rest on premolars to either the mesial or distal side of the tooth or both depending upon the prognosis of the posterior molar. Extension Based RPD’s Retainers placed anterior to the axis of rotation in an extension situation should not be in undercuts since that portion of the RPD framework will lift the abutment when a vertical load is applied posteriorly in the extension area. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area Therefore, we must maximize the coverage of the edentulous extension area with fully extended impressions Altered cast impressions Fully extended impressions with a custom tray, 23. Requirements of a Removable Partial Dentures Provided by : Retention Direct “ I” bars premolar Circumferential clasp on molar Proximal plates (when parallel) Indirect Cingulum rests on cuspids Mesial rest on premolar Stability Minor connectors-proximal plates Lingual plate on posterior teeth Cingulum rests Support Occlusal rests Extension base Major connector Reciprocation Minor connectors Cingulum rests Proximal plates Lingual plate, 48. Kennedy Classification Based on locations and number of edentulous areas Class I – Bilateral edentulous areas located posterior to the remaining teeth Class II – A unilateral edentulous area located posterior to the natural teeth Class III – A unilateral edentulous area with natural teeth both anterior and posterior to the area Class IV – A single but bilateral (crossing the midline) edentulous area located anterior to the remaining natural teeth Modification spaces Edentulous areas other than those determining the main classes are modification spaces and are designated by the number of spaces present Class IV has no modifications. Major connectors must be rigid Courtesy Dr. A. Davodi, 52. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) Note the rest on the cingulum of the left cuspid. Forces acting on Removable Partial Dentures Vertical (dislodging) Forces of gravity in maxillary RPD’s Horizontal (lateral) During bruxing Vertical (seating) Forces of occlusion (clenching) The object of prosthesis design is to counter these forces without stressing the abutment teeth and the supporting soft tissue denture bearing surfaces beyond their physiologic tolerance. The paper publishes previously unknown photographs of Vsevolod Meyerhold’s biomechanics, from the private archive of the actor, stage director, and teacher, Pavel Vladimirovich Urbanovich. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Comment on "Prosthetic heart valves' mechanical loading of red blood cells in patients with hereditary membrane defects" by Grigioni et al., Journal of Biomechanics 38, 1557-1565 Article Feb 2006 If you wish to opt out, please close your SlideShare account. RPD Biomechanics Extension base RPD’s Fulcrum line (axis of rotation) When and occlusal force is applied: The prosthesis rotates towards the mucosa on the extension base side of the fulcrum line All parts of the RPD framework on the dentate side rotate away from the dentition, 30. Maximum support is gained from the adjacent soft tissue denture bearing surfaces. shivani_saith. JAB is an official journal of the International Society of Biomechanics, and has a working affiliation with the American Society of Biomechanics. RPD Biomechanics. Extension Based RPD’s Amount of movement is dependent upon: The surface area of the mucosal support area The thickness and compressibility of the supporting mucosa The adaptation of the denture base to the tissues of the extension base Refinement of the occlusal factors (distal extension RPD’s) Anterior guidance – Centric only contact posteriorly, 24. Preservation of teeth 1. You can change your ad preferences anytime. Extension Based RPD’s Axis of rotation (fulcrum line) Axis of rotation (fulcrum line) is determined by the position of the rests adjacent to the edentulous extension area. Performed and interpreted, with great appreciation, by Dr Arthur English, Professor of Cell Biology, Emory University. biomechanics. Extension Based RPD’s This retainer serves two purposes Retention – Frictional In the event the distal molar is lost This retainer can be slightly can be slightly recontoured and bent to engage the undercut of the canine.
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