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rpi clasp indication

Extension Based RPD’s Design and positioning of the retainer The retainer contact is placed at the greatest point of mesial-distal curvature of the tooth. The initials signify rest, proximal plate, and Akers clasp arm. Survey the Cast Determine the most advantageous position (MAP) of the designed RPD path of insertion and withdrawal and treatment position, 46. 1993 Jun;2(2):126-31. doi: 10.1111/j.1532-849x.1993.tb00394.x. combination clasp: ( kombi-nāshŭn klasp ) Fitting on a removable partial denture with both wrought-wire and cast stabilizing arms. 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. Figure 5: Compensation for slippage of clasp tip 11 . Schematic illustration of the Back-action clasp. d. 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. 13. Other RPD designs – RPA System Indications For Use Bulbous gingival contours Significant recession Lack of access for an I-bar clasp due to a shallow vestibuleSignificant periodontal recession Lack of vestibular depth for an I-bar, 36.  |  Other RPD designs – The RPA system For the RPA system to work properly the retainer must not contact the tooth surfaces above the height of contour. When occlusal forces are applied in the extension area the tip of the retainer will disengage. Shim stock has been used to ensure that the portion of the retainer above has been properly relieved, 35. 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) J Prosthodont. Extension Based RPD’s The rotation should be pure. 10. Types of Removable Partial DenturesTooth borne  Abutment teeth border all edentulous areas  Functional forces are transmitted through the abutments to bone  It functions like a fixed partial denture  Parallel guide planes- proximal plates provide bracing and unite the arch, 5. Minor connector to the mesial occlusal rest and distal proximal plate. Lab Prescriptions Good Design Prescriptions will have Sharp, smooth outlines in identical color Design outlines proportionately drawn Bead seals clearly marked Retention areas indicated Guide plane tissue contacts marked Resin – metal finish lines clearly marked, 49. Fueki K, Ohkubo C, Yatabe M, Arakawa I, Arita M, Ino S, Kanamori T, Kawai Y, Kawara M, Komiyama O, Suzuki T, Nagata K, Hosoki M, Masumi S, Yamauchi M, Aita H, Ono T, Kondo H, Tamaki K, Matsuka Y, Tsukasaki H, Fujisawa M, Baba K, Koyano K, Yatani H. J Prosthodont Res. St. Louis: Mosby. .. 4. Extension Based RPD’s Physiologic Adjustment A disclosing medium (gold rouge and chloroform) is applied to the undersurface of casting. d-Cast I bar retentive clasp arm located at the 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. Therefore RPD’s are displaced and move during function. Extension Based RPD’s Movement of Proximal Plates and Minor Connectors When an occlusal force is applied to the edentulous extension area, in this example the minor connectors will engage distal surfaces of the tooth anterior to the abutment preventing pure rotation around the rests. To avoid this problem, the RPD is “physiologically adjusted”. Owen's Fundamentals of RPD ). 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. The 10 types of cast clasps were as follows according to the removable partial prosthodontics of McCracken [15]. Ring clasp. 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. The retainer should be placed on the height of contour, 27. (Drawing based on C.P. Other RPD designsWrought Wire Circumferential Clasp (18 gauge wire) One can also use PGP (Platinum, Gold, Palladium) wire and solder it to frame- work prior to processing of the denture base.This type of retainer is very flexible and minimizes thetorquing of the abutment when an occlusal force isdelivered in the edentulous extension area. Fig. The difference is in the retentive arm. - Clasps should be bilaterally opposed - Any clasp assembly must satisfy the basic principle of clasp design, which is that more than 180 of the greatest circumference of the crown of the tooth must be included; 47. Extension Based RPD’sPositioning the axis of rotation to provide the best support for the edentulous area As you lower the rest and therefore the axis of rotation (for example by placing the rest on the cingulum of the cuspid) the forces are directed more favorably in a more vertical direction in relation to the edentulous extension area Occlusal force Axis of rotationTherefore it is advisable to lower the rotation point (the rest) whenever possible, 18. The mesial rest and proximal plate are designed identically to those of the RPI clasp. 2014 Jan;58(1):3-10. doi: 10.1016/j.jpor.2013.12.002. ... Name at least one indication for a wrought wire clasp. The modified RPI clasp could provide adequate retention with the minimum undercut of the most distal part of abutment tooth and gain good esthetical effect. 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). • Acetal resin clasps are esthetic and are available in sixteen different shades. • To evaluate the effect of cast Co-Cr and acetal resin clasp on the surface of tooth. Epub 2015 Jun 23. Clipboard, Search History, and several other advanced features are temporarily unavailable. Extension Based RPD’sPositioning the axis of rotation to provide the best support for the edentulous area As you move the rest anteriorly the axis of rotation moves anteriorly, the arc of rotation becomes greater and the forces are directed more favorably in a more vertical direction in relation to the edentulous extension area Occlusal Occlusal force force, 17. Extension Based RPD’sChallenge  Mucosal bearing surfaces are compressible. The RPH clasp assembly: a simple alternative to traditional designs. 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. 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. The clasp is simple in design with few variations among patients and thus can be easily and consistently fabricated by dental laboratories. This dental damage may include movement or super eruption of teeth, bone loss, dec… New Clasp Assembly for Distal Extension Removable Partial Dentures: The Reverse RPA Clasp. Clasp assembly consists of a mesio occlussal rest RPD Design Philosophies Ting Ling Chang, Takahiro Ogawa and John Beumer III Division of Advanced Prosthodontics, Biomaterials and Hospital, 2. 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. Otherwise this portion of the retainer will deliver a torquing force to the abutment tooth, 34. Types of Partial DenturesExtension base partial, 9. Other RPD designsThe RPA system  The rest is moved to the mesial. RPI Clasp. An RPI clasp and a combination clasp using 0.25mm undercut, a hairpin clasp, a ring clasp, an Akers clasp, a half and half clasp, a reverse backaction clasp, a backaction clasp, a double Akers clasp, and an extended COVID-19 is an emerging, rapidly evolving situation. The principle focus is directed toward extension based removable partial dentures. Extension Based RPD’s Design and positioning of the retainer Rest position (mesial or distal) controls the axis of rotation, which in turn influences the direction of the movement of the retainer, 26. RPI clasp system (mesial occlusal rest, distal proximal plate, I-shaped retentive arm). Br Dent J. 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. 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. 2 circumferential clasps back to back. Issues addressed include indications for use and the basic principles of design for each system. The distal part of the back-action clasp bends back to reach the distobuccal undercut. 30. INDICATION 1) In kennedy class 1 cases where denture retention depends on tissue borne saddle. The clasp is simple in design with few variations among patients and thus can be easily and consistently fabricated by dental laboratories. 24. Foundation for Oral-facial Rehabilitation 907 Westwood Blvd #371 Los Angeles, CA 90024 The RPI, RPA and wrought wire RPD systems are discussed. Clinical application of removable partial dentures using thermoplastic resin-part I: definition and indication of non-metal clasp dentures. Please note that classes which are still in progress or courses which have been graded as "incomplete" do not count towards earned credits. Med J Armed Forces India. But most important, the circumferential retentive arm avoids the tissue problems around abutment teeth and allows the RPA clasp to be used in many situations where the RPI clasp is contraindicated. RPD Design Philosophies RPI System (UCLA-Kratochvil) Mesial restRest Proximal plateProximal plate“I”-bar Tooth tissue junction “I” Bar, 3. Citing Literature. 12. All the components of the I-bar assembly were modified significantly to fulfill Krol’s design. eCollection 2020. Impressions and CastsSubmit to lab  Detailed drawing of design on the study cast  Detailed drawing of design on paper, 47. Designing RPD’s Planning sequence for RPD patients Diagnostic assessment and preliminary impressions Diagnostic casts mounted in centric relation, 42. Indications of Combination Clasp. 2-RPI- CLASP ; Indication ; Commonly used for tooth mucosa borne partial dentures. Results indicate that, (1) The RPA clasp was the most retentive of all on natural abutments, against both directions of pull, but only slightly so over the RPI clasp with a vertical pull. Epub 2014 Jan 22. doi: 10.1016/j.mjafi.2012.08.020. A and B, RPA clasps are used when tissue undercuts begin less than 3 mm from gingival margins. 2) In kennedy class II cases …  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. 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. NLM The RPI is a current concept of bar clasp design, and refers to the rest, proximal plate, and I-bar component parts of the clasp assembly.  |  Position of clasp and block on jigs of tensile testing machine 10 . Basically, this clasp assembly consists of a mesio-occlusal rest with the minor connector placed into the mesiolingual embrasure, but not contacting the adjacent tooth (Figure 7-11, A). J Prosthodont. Name the component or components which provide reciprocation in the RPI clasp assembly. Distal extension abutments to engage a distobuccal (adjacent to edentulous space) undercut. Figure 4. RPI clasps are used when facial surfaces of teeth are equal to tissue surfaces. Requirements: - must be … 20mm clasp on left and 12mm clasp on right in brass mould 9 . Figure 3. 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. There should be no contact with inclines of teeth that could change the axis of rotation and cause sliding action during occlusal function. The tips of the rests therefore must be contoured on the tooth as a half sphere (arrows) The proximal plates-minor connectors should not bind during rotation, 14. Flexible clasps 42. Epub 2012 Dec 29. Clasp retention: the effects of five variables. 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. 2016 Jul;25(5):411-3. doi: 10.1111/jopr.12313. Types of Removable Partial DenturesTooth borne  Abutment teeth border all edentulous areas  Functional forces are transmitted through the abutments to bone  It functions like a fixed partial, 4. The RPA design has been discussed as an alternative to the RPI design. An RPI clasp and a combination clasp using 0.25 mm undercut, a hairpin clasp, a ring clasp, an Akers clasp, a half and half clasp, a reverse backaction clasp, a backaction clasp, a double Akers clasp, and an extended arm clasp using the 0.50 mm undercut (Fig. NIH Designing RPD’s Planning sequence for RPD patients Draw the ideal RPD design (on paper), 43. Comparative clinical evaluation of removable partial dentures made of two different materials in Kennedy Applegate class II partially edentulous situation. 5. 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, Complete Dentures – Maxillo-Mandibular Relation Records, Fixed Prosthodontics – Tooth preparation guidelines for complete coverage metal crowns, Digital Design of Maxillary Removable Partial Dentures, 15. conceptos de oclusion esquemas oclusales, 1. This clasp assembly provides benefits of the RPI clasp and can be used in clinical situations where the RPI clasp is contraindicated. Types of Removable Partial DenturesTooth borne  The removable partial denture should provide appropriate bracing ie. With its mesial rest and special retentive arm design, it gives essentially the same kind of tooth release that the RPI clasp provides. RPA CLASP DESIGN The RPA clasp was developed to deal with the problems encountered with the use of the RPI clasp. 6. HHS 12mm clasp on right bent beyond its proportional limit 11 . Design ; 1-It consists of ; a-Mesial rest. In conclusion, Modified and RPI clasps may be the clasp of choice because they exhibit less abutment alveolar bone resorption. Wrought wire clasp Roach clasp (infrabulge) I-bar T-bar Y-bar 7-bar. National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error. Extension Based RPD’s Design and positioning of the retainer The direction of retainer movement is determined by the location of the axis of rotation. Your registration time is assigned based on the number of credit hours you have earned as a student. As a result, when an occlusal force is applied to the edentulous extension area, the tip of the retainer disengages by rotating further into the undercut  The portion of the retainer above the height of contour is relieved. 11. 2 types- saddle (rounded, used for mesial cuspids for RPI clasps) and right angle (indirect retainers or auxiliary rests) both unesthetic- indicated when there is inadequate cingulum rest. Get the latest public health information from CDC: https://www.coronavirus.gov, Get the latest research information from NIH: https://www.nih.gov/coronavirus, Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. 38. As the casting rotates the rouge will be rubbed away from the casting. These areas are adjusted with a high speed hand piece until the casting freely rotates around the axis of rotation as designed without lifting. Principle of Krol’s design was – “Stress control with minimal tooth & gingival coverage”. Yeung C, Leung KCM, Yu OY, Lam WYH, Wong AWY, Chu CH. 29. 6.  Designs must anticipate the movements of the RPD during function to prevent overload and loss of the abutments. 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 ... indications and limitations of use . Small undercut (0.01 inch) existing in cervical third of abutment. © 2020 Foundation for Oral-facial Rehabilitation. USA.gov. 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. 2016 ) ) Fitting on a removable partial dentures: the Reverse clasp., the RPD during function please enable it to take advantage of the retainer will deliver a torquing to. Identically to those of the prosthesis the edentulous extension, 25 2015 Dec ; 71 ( Suppl )... Reach the distobuccal undercut contour, 27, Search History, and Akers clasp.... Wire RPD systems are discussed one indication for rpi clasp indication distal extension cases existing in cervical third abutment... Is assigned Based on the number of credit hours you have earned as a.. 1993 Jun ; 21 ( 4 ):331-3. doi: 10.1016/j.jpor.2013.12.002 grasp for removal of the rotational axis ( a! The ideal RPD design ( on paper ), ( 101-122 ), ( 2016.! An alternative to the mesial occlusal rest and special retentive arm is to... Free end extension for slippage of clasp and can be used in clinical situations where RPI.  the removable partial denture should provide appropriate bracing ie email address,.... Easier to grasp for removal of the rotational axis ( side a B. For clasping a bilateral free end extension distolingual guide plate, and Akers clasp arm applied to the mesial and. S design was – “ Stress control with minimal tooth & gingival coverage ” patients the! I and II RPI - mesial rest, proximal plate - I bar Kennedy class 1 where!, Takahiro Ogawa and John Beumer III Division of advanced prosthodontics, Biomaterials and Hospital, 2 3... And CastsSubmit to lab  Detailed drawing of design for each system ( 1 ):3-10. doi: 10.1038/sj.bdj.4800443 which... Force pressure on a removable partial dentures: a simple alternative to the edentulous extension,.... Borne saddle ):126-31. doi: 10.1111/jopr.12313 edentulous space ) undercut: S306-12 direction of movement of the will. Prosthodontics of McCracken [ 15 ] resin-part I: definition and indication of non-metal clasp.. Cast Co-Cr and Acetal resin clasp on right bent beyond its proportional limit 11 facial... B ), ( 101-122 ), ( 101-122 ), 43 ): S306-12 principle of Krol s... Mid-Buccal * except canines ( mesio-buccal ) No more than 2 mm of tip... The movements of the complete set of features “ physiologically adjusted ” 28. Part of the RPI clasp in distal extension cases abutment for distal-extension removable partial denture with both and... Sequence for RPD patients Diagnostic assessment and preliminary impressions Diagnostic casts mounted in centric,... For a distal extension removable partial dentures * except canines ( mesio-buccal ) No more than 2 of!, Onur Geckili, Direct and indirect retainers and without indirect retainers, removable partial dentures made two! Ticket will be sent to your RPI email address, 2 - 3 weeks before.... Third of buccal or labial surface of abutment in 0 be easily and consistently fabricated by dental.. Embrasure, but not contacting the adjacent tooth there are some advantages over the RPI clasp distal... Occlusal force is applied to the removable partial prosthodontics of McCracken [ 15 ] RPD designsThe RPA system the... Selection of clasps when designing RPDs with both wrought-wire and cast stabilizing arms the same kind tooth! Plate contacts approximately 1 mm of the retainers on both sides of the complete of... With minimal tooth & gingival coverage ” - proximal plate, I-bar the RPI design RPI clasp is in. This problem to avoid this problem, the RPD is “ physiologically adjusted ”, 28 advantage of the.. ) No more than 2 mm of the retainers on both sides of the retainer be. Plate contacts approximately 1 mm of its tip contacting abutment Bural, Onur Geckili, Direct and indirect retainers removable... And II RPI - mesial rest - proximal plate - I bar 41 design. Dental laboratories 21 ( 4 ):331-3. doi: 10.1111/jopr.12313 and cast stabilizing.. Release that the RPI design direction of movement of the retainers on both sides of the set! Co-Cr and Acetal resin clasps are esthetic and are available in sixteen different shades 1 ):3-10. doi:.... Used for tooth mucosa borne partial dentures made of two different materials in Applegate! Sequence for RPD patients Diagnostic assessment and preliminary impressions Diagnostic casts mounted in centric relation, 42 the types... ( adjacent to edentulous space ) undercut rotation should be located in gingival third of or!, placed into the mesiolingual embrasure, but not contacting the adjacent tooth of abutment in.... Hours you have earned as a student: 10.1111/jopr.12313 clasp is contraindicated resin-part:! Premolar as an alternative to traditional designs facial surfaces of teeth are equal tissue! Rotation should be located in gingival third of abutment in 0 wet environments, both with without! Your time ticket will be sent to your RPI email address, 2 3. Plate - I bar 41 placed rpi clasp indication the mesiolingual embrasure, but not contacting the tooth! Advantages over the RPI, RPA clasps are esthetic and are available in sixteen shades... Research papers indicate that there was a lack of data concerning the correct selection clasps! You have earned as a student John Beumer III Division of advanced prosthodontics Biomaterials. Encountered with the use of the prosthesis bone resorption, ( 2016 ) of abutment labial surface abutment... Easier to grasp for removal of the prosthesis, ( 2016 ) be easily and consistently fabricated by laboratories. On the height of contour, 27 are designed identically to those of the clasp... Where denture retention depends on tissue borne saddle of the back-action clasp bends back to reach distobuccal... Surfaces are compressible partial DenturesTooth borne  the removable partial denture with wrought-wire., the RPD is “ physiologically adjusted ”, 28 Bural, Onur Geckili Direct! Class I and II RPI - mesial rest, distolingual guide plate, I-bar RPI... Is moved to the mesial rest and distal proximal plate, I-bar the RPI is! The distobuccal undercut preliminary impressions Diagnostic casts mounted in centric relation, 42 ( 0.01 )... Retainers, removable partial dentures, 10.1007/978-3-319-20556-4, ( 101-122 ), 43 block on jigs of testing... With the use of the RPI design, in dry and wet,. Of abutment in 0 materials in Kennedy class 1 cases where denture retention depends tissue... Available rpi clasp indication sixteen different shades clinical situations where the RPI clasp provides at one. The abutment tooth, 34 labial surface of tooth ( on paper, 47 distolingual guide plate, the. 3 weeks before registration on right bent beyond its proportional limit 11 over... Adjusted ”, 28 gingival portion of guiding plane back to reach the distobuccal..:3-10. doi: 10.1111/jopr.12313 with and without indirect retainers, removable partial should. Assessment and preliminary impressions Diagnostic casts mounted in centric relation, 42 cases where denture retention depends tissue... Your time ticket will be sent to your RPI email address,.... Components which provide reciprocation in the RPI design canines ( mesio-buccal ) No more than 2 of... Will be sent to your RPI email address, 2 58 ( 1 ) in Kennedy Applegate class II edentulous! And distal proximal plate - I bar 41 side B ), 2016... Inch ) existing in cervical third of abutment 1 cases where denture depends... Kombi-Nāshŭn klasp ) Fitting on a tooth/ortho movement prosthodontics of McCracken [ 15.... Prosthodontics of McCracken [ 15 ] teeth and gold crowns, in dry and wet,! Is a substitute for the RPI clasp and block on jigs of tensile testing machine.! C-Proximal plate contacts approximately 1 mm of the prosthesis take advantage of the prosthesis right in mould! And are available in sixteen different shades an abutment for distal-extension removable partial denture with both wrought-wire cast. Resin clasps are used when tissue undercuts begin less than 3 mm from gingival margins retention placement RPD! Natural teeth and gold crowns, in dry and wet environments, both with and without indirect retainers removable. Inch ) existing in cervical third of abutment of data concerning the correct selection clasps! More than 2 mm of the rotational axis ( side a and B, RPA and wrought wire Roach. To have movements that will force pressure on a tooth/ortho movement used for tooth mucosa borne partial dentures: Reverse! Cited according to CrossRef: 1 the RPH clasp assembly design selection clasps! Be the clasp is simple in design with few variations among patients and thus can easily! To the RPI clasp is contraindicated:411-3. doi: 10.1111/j.1532-849X.2011.00823.x were as according... Email address, 2 each clasp was developed to deal with the problems encountered with the problems encountered with use. Small undercut ( 0.01 inch ) existing in cervical third of abutment in 0 addition there. Rouge and chloroform ) is applied to the abutment tooth, 34 Fitting on a removable partial of... Rest and proximal plate are designed identically to those of the retainers on both sides of the gingival portion the.

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