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[1][2][3][4][5], ... Anterior or posterior abutments may experience extrusive force and the resultant tensile force at the retainer to abutment interface may lead to potential loss of retention for these restorations, thus resulting in marginal leakage, caries of abutment, and FDP failure. When we have impaired function, we lose the support of bone structure around the teeth because of the lack of physiologic function which stimulates the soft and hard tissues. 93/135Abutment & Its Selection In FPD 94. The pattern of stress reflected the condition of loading. Malone WFP, Koth DL. This clinical case report describes incorporation of non Clinical placement of modern glass-ionomer cements. Purpose: The aim of the present study was to evaluate the stress distribution of three different It must be remembered that each tooth must function both as an individual and as a part of a collective unit; this makes each tooth an important factor in the function of the entire mouth. fixed partial denture (FPD) utilizing pier abutment [2]. This paper presents a clinical case report which describes incorporation of nonrigid connector to rehabilitate pier abutment case. The aim of this retrospective study was to evaluate the effect of removable partial dentures in periodontal abutment teeth in relation to the type of denture support and design of RPD in a five-year worn period. serve as abutments. NLM A pier abutment has been traditionally found as a common clinical occurrence. Independent in direction and magnitude: Tendency for prosthesis to … Tooth preparation and the fabrication of precision and semiprecision attachments are described. Complete RPD Framework Prescription (instructor signature required) a. If the dental profession would take time to educate the patient in the preventive phase of dentistry and make an adequate treatment plan, we would see fewer dental cripples. ... Este modelo presenta un comportamiento lógico de acuerdo con las propiedades mecánicas de los materiales y los tejidos, ya que las restauraciones, debido a su módulo de elasticidad más alto, absorben mayor esfuerzo, esto se evidencia en el modelo rígido en el que la distribución de esfuerzos se da a lo largo de toda la estructura, resultado también encontrado en los estudios de Oruc y colaboradores 4 y Savion y colaboradores. Moreover, an intermediate abutment is a natural tooth located between terminal abutments that serve to support a fixed/removable prosthesis. partial denture with a pier abutment, the pier abutment may act as a fulcrum. The prepared specimens were tested in a custom made uniaxial testing machine. However, an implant does not undergo mesial drifting, and the NRC location is more flexible. 3. determined from radiographs. USA.gov. Quintessence Int. The preparation of the tooth itself must include provision for the components and path of placement of the removable partial denture and at the same time conform to all the parameters associated with proper tooth preparation. Finally, the thickness of the porcelain or the ceramic (veneers) ofmetal-ceramic and all-ceramic single- and multi-unit fixed dental prostheses is of importance. Purpose: The aim of the present study was to evaluate the stress distribution of three different support designs for mandibular distal extension removable partial denture (DERPD) associated with a pier abutment (lower second premolar) by National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error. abutments that to support a fixed or removable dental prosthesis(2). Clinical trials have shown that if basic principles of RPD design are followed (rigid major connectors, simple design, proper base adaptation), periodontal health of the remaining dentition can be maintained. St Louis: Ishiyaku Crown or Fixed partial denture’s for removable partial denture abutments (if necessary) 9.  |  (2006), ... En los resultados presentados en esta investigación, la explicación de por qué se aumentó el esfuerzo en el modelo no rígido en la estructura se debería a que al tener un ajuste en el pilar intermedio, se comportaría como dos tramos independientes y no se presenta una distribución a lo largo de la restauración sobrecargando más la estructura en algunas zonas, donde los tejidos subyacentes terminarían lar y los esfuerzos más bajos se dieron en la raíz. Thus, tensile forces may then be generated between the retainer and abutment at the other end of the loss of retention for these restorations [4]. The preparation of spoon-shaped or rounded rest-seat areas that direct forces toward the long axes of abutment teeth provides positive support for the partial denture. Dental Abutments* Dental Casting Technique* Denture, Partial, Removable* Humans Restoration of two missing teeth and an intermediate pier abutment with a rigid FDP is not an ideal treatment(3-5). Invito a los miembros de la Sociedad a participar enviando sus artículos enmarcados en las nuevas normas para la publicación de artículos científicos que pueden encontrar en la página web de la Sociedad Peruana de Prótesis Dental y Maxilo Facial y que, Dios mediante, contará For the incisors, all parameters increased with depth except ultimate strain which decreased. Pier abutment, also named intermediate abutment and is defined by the Glossary of Prosthodontic Terms as a natural tooth located between terminal abutments that serve to support a fixed or removable dental prosthesis. Esperemos que el esfuerzo de todos nosotros permita consolidar nuestra querida publicación. A two-dimensional photoelastic model was constructed to represent the mandible with a missing first premolar and first molar. This is obvious when we see a great number of mouths from which teeth have been extracted and in which no immediate replacement has been made. Purpose: This study was aimed to examine the effect of three different bridge designs with pier abutment on strain analysis of Zirconia Bridges after aging process (cyclic loading and acid storage). Treatment planning does not receive adequate attention either in dental education or in dental practice. from the entire orofacial system. distributions. Stress Analysis of Different Designs of Distal Extension Partial Dentures with Pire Abutements: (A Finite Element Analysis), Non-rigid connector: The wand to allay the stresses on abutment, Different techniques for management of pier abutment: Reports of three cases with review of literature, Stress distribution on a five unit fixed partial prosthesis with intermediate abutment: biomechanical analysis using a finite element model, A three-dimension finite element analysis to evaluate the stress distribution in tooth supported 5-unit intermediate abutment prosthesis with rigid and nonrigid connector, Distribución de los esfuerzos en tramos protésicos fijos de cinco unidades con pilar intermedio: análisis biomecánico utilizando un modelo de elementos finitos, Two Part FPD: Breaking Stress around Pier Abutment, Non-Rigid Connector for Managing Pier Abutment in FPD: A Case Report, Elucidating the Problem of Pier Abutment through the Use of a Fixed Movable Prosthesis – A Clinical Case Report, Pier abutment periodontal outcome -fixed fixed versus fixed movable bridge, A periodontally biocompatible fixed bridge designing - a case report, Management of Partial Edentulism Using Nonrigid Connectors as a Treatment Modality: A Case Report, Prosthetic Rehabilitation of Siebert’s Class II Case and Pier Abutments - Case Report, Non-Rigid Attachment to break the stress on Pier Abutment: A Case Report, NON-RIGID ATTACHMENT TO BREAK THE STRESS ON PIER ABUTMENT: A CASE REPORT, SStrain Analysis of Zirconium Fpds with Pier Abutments Using Different Designs, Carta Odontologica de la Sociedad Peruana de Protesis Maxillo Facial, Converting a removable prosthetic option into fixed by using custom made non rigid connector, Effect of prosthetic designs and alveolar bone conditions on stress distribution in fixed partial dentures with pier abutments, Stress analysis of effect of non rigid connectors on fixed partial dentures with pier abutments, Tensile and compressive behavior of the bovine periodontal ligament, Treatment planning for mouth rehabilitation, Broken-stress principle and design in fixed bridge prosthesis, The use of non-rigid connectors for long span ceramo-metal fixed partial dentures, Load transfer by fixed partial dentures with three abutments, Photoelastic stress analysis of supporting alveolar bone as modified by nonrigid connectors, A photoelastic study to determine the location of the nonrigid connector in a five-unit intermediate abutment prosthesis, Nonrigid Connectors for Fixed Partial Dentures, The use of IMZ osseointegrated implants in partially and completely edentulous patients: success and failure rates of 2,023 implant cylinders up to 60+ months in function, Elastic modulus of the perioontal ligament, Photoelastic stress analysis in a pier retainer of an anterior resin-bonded fixed partial denture, Measurement of the Physiological Mobility of Individual Teeth in an Axial Direction, Numerical analysis of tooth mobility: Formulation of a non-linear constitutive law for the periodontal ligament, [Loading and strength of single- and multi-unit fixed dental prostheses 2. In practice, however, we see very less practitioners implementing such procedures. 1.1. Few studies are available, and none substantiate the theory that the pier abutment serves as a fulcrum. Completely rigid restoration: Contraindicated.. 1. Conclusion: The results of stress analysis were insignificant for all designs in all studied ... Use of a fixed bridge in such cases has shown to result in decementation of the fixed partial denture. DOWNLOAD. ... Studies on patients with removable partial denture with pier abutment are very rare, and a few in vitro studies was available for FPD with pier abutment.  |  Forces transmitted through the cantilevered pontics can cause tilting and rotational movements of the abutments. For restoration of arches with pier abutments, if a rigid connector is used and occlusal load is applied on the abutment teeth at one Such abutments have been called as a pier abutment. Background: A removable partial denture (RPD) is a common treatment available for restoration of partially edentulous ridges. This 6‐month follow‐up clinical study evaluated the degree of mobility of abutment teeth of distal extension and tooth supported removable partial dentures by using Periotest. With respect to the strength of multi-unit fixed dental prostheses, the length of the arch span between the abutment teeth, the pontic with the connectors and the possible cantilevers are the critical components. 2 (April-June 2018) 279 The impact of removable partial dentures visits were needed to maintain health. Porcelain veneer crowns can be made equally satisfactory but only by the added step of contouring the veneered … Patients undergoing re- movable partial denture treatment must follow strict oral hygiene protocols. Von Misses stresses, main, maximum and minimum, were calculated for each group. The co-cured, light-activated glass-ionomer cement-composite resin restoration. Removable partial dentures (RPD) have an important role in the health of periodontium. Fourteen patients of mandibular Kennedy Class I classification with pier abutment were divided into two groups; Group I received Conventional removable partial dentures, while the other group received Telescopic removable partial denture. METHODS: non-metric dental traits were observed using the Standard ASUDAS and other authors, in total 165 non metric traits were examined. Compared with the other designs, prostheses with nonrigid connectors at the pier exhibited greater apical and horizontal stress particularly with one-point loading on the pier. 11, 12 Savion et al. Results: The analysis of the von Mises stress revealed that the stress concentration was located However, the most critical long term criteria were to design the prosthesis biocompatible to the periodontium. Studies in periodontometry have shown that the faciolingual movement ranges from 56-108 m and intrusion is 28 m. Teeth in different segments of the … Figure 7. The construction of crowns for teeth that will serve as abutment teeth for removable partial dentures is an important and technically demanding procedure. Alternatives to silver amalgam and resin composite in pediatric dentistry. NIH Stress analysis of effects of nonrigid connectors on fixed partial dentures with pier abutments. Removable partial dentures were evaluated for material, stability, retention and occlusion. This article in the form of a clinical case report describes the management of pier abutment case over a period of 5 years with a fixed movable prosthesis. hi, we're drs. Considering the limitations of this study, the following conclusions were drawn: 1. In order to The ultimate strength of a dental prosthesis is defined as the strongest loading force applied to the prosthesis until afracture failure occurs. ... Abnormal forces on a fixed fixed bridge that has been cemented with a rigid cement usually will result in the decementation of the retainer rather than periodontal damage. The forces applied to the abutment teeth and their effects are very important considerations in the design and construction of the removable partial dentures. 3. in 2006 did a study using a mathematical model where he concluded that debonding may occur in the anterior abutment, but not due to the teetering of the FPD around the pier abutment, ... A rigid connector in long span FPD with a pier abutment, acts as a lever with high stress concentrations and excessive displacements may be observed at terminal abutments. Fabricating abutment crowns for existing removable partial dentures using custom clasp analogs. As posterior teeth will tend to tilt mesially, the female portion of the attachment would be best placed on the distal surface of the more anterior tooth (Figure 3). area related to the pier abutment. This is a superior treatment but considerably more expensive. The advantages of this type of attachment are that the normal tooth contour can be maintained, minimal tooth reduction is necessary and the possibility of devitalizing the tooth is reduced. A dentist may restore these edentulous spaces with a long span resin-bonded fixed partial denture using the pier and the 2 terminal abutments for bonding. A pier (intermediate) abutment is a natural tooth located between terminal abutments that serve to support a fixed or removable dental prosthesis. Contra – indications: None. Strength]. Pier abutments act as a Class I fulcrum lever system when the teeth are incorporated in a fixed partial denture with rigid connectors. An observational cross-sectional study was done on a sample of patients rehabilitated with removable partial dentures (2010 to 2013). Figure 10-2 Distortion of tissues over the edentulous ridge will be approximately 500 µm under 4 newtons of force, whereas abutment teeth will demonstrate approximately 20 µm of intrusion under the same load. May be used to avoid trauma to abutment on free-end extension partial dentures. Draw design on 2nd cast 12. Therefore non-rigid connector incorporated into the fixed partial denture might reduce the stresses created by the leverage. The use of pier abutments should be avoided and it is more favorable to use 3-unit resin-bonded fixed partial dentures. The stresses acting on abutment teeth and denture bases and the movements of denture bases were investigated, and the influences of denture design were clarified. Important key terms are strength, hardness, toughness and fatigue. 4. Longitudinal studies indicate that RPDs have been associated with increased gingivitis, periodontitis, and abutment mobility. This is used in the context of a fixed bridge (the "abutment teeth" referring to the teeth supporting the bridge), partial removable dentures (the "abutment teeth" referring to the teeth supporting the partial) and in implants (used to attach a crown, bridge, or removable denture to the dental implant fixture). Types of Abutment Tilted abutment Cantilever abutment Pier abutment Post core abutment 15. The light-cured composite restoration: an adjunct to removable partial prosthodontics. 9. ModelB (MB) represented a removable partial overdenture with a dome shaped preparation on the pier abutment. Broken-stress measures serve as “safety valves” against the tremendous leverage forces created by the rigid attachment to two or more teeth. Pier abutments A pier (intermediate) abutment is a natural tooth located between terminal abutments that serve to support a fixed or removable dental prosthesis. For the non-extracted abutment teeth significant changes during time for the variables tooth mobility (p < 0.0001) and radiological bone loss (p= 0.0240) were observed. A 50-N static vertical occlusal load was applied on the cusp of each abutment to calculate the stress distributions. Nederlands tijdschrift voor tandheelkunde. Restoration of pier abutments with rigid FPDs is associated with higher debonding rates than short-span prostheses. Lenz J, Schindler HJ, Pelka H. Die Keramikverblendete NEM-Konuskrone. The rigid and nonrigid connector design have effect on stress distribution in 5-unit FPDs with pier abutments. Pakistan Oral Dental Journal Vol 38, No. This abutment is called as a pier abutment. Questionable abutments 7. This study indicated that the rigid FPD distributed stresses vertically and evenly. Background: A removable partial denture (RPD) is a common treatment available for restoration of partially edentulous ridges. the periodontal ligament, is described by using a hyperelastic constitutive model. It has been postulated that terminal abutment has a rocking movement when in function, whereas pier abutment acts as a fulcrum. A 3-dimensional cross-section FEM model (SAP 2000) simulating a 5-unit metal ceramic FPD with a pier abutment with rigid or nonrigid designs (connector location at the mesial region of the second molar, at the distal region of the second premolar, at the mesial region of the second premolar, and at the distal region of the canine) was developed. Non-rigid connector placed on the distal aspect of pier seems to reduce potentially excess stress concentration on the pier abutment. Tylman's Theory and Practice Six FPDs were constructed, one of rigid design and five of nonrigid design with varying location and orientation of the nonrigid connector. The aim of this article is to introduce a technique in which light-curing glass-ionomer resin cement is utilized for the direct restoration of removable partial denture abutments. Conclusion: the fixed-fixed design showed the equal strain distribution when it is used to restore maxillary 5-unit FPD with pier abutment. end of fixed partial denture (FPD), it results in the pier abutment acting as a fulcrum. Methods: A total of 205 patients with RPDs participated in this study. Badwaik PV, Pakahan AJ. 8) Fixed partial denture is preferred to use in epileptic patient (patient with sudden bouts of unconsciousness fitness), patient suffering from Parkinson while the removable P.D. publicaciones internacionales, con miras a lograr la indexación internacional de nuestra revista. It is recommended to place a metal coping on this abutment before construction of the FPD to reduce the potential for dental caries on the overdenture abutment. Because of physiologic tooth movement, arch position of the abutments, and the retentive capacity of the retainers, a nonrigid connector may be preferred in the fabrication of a five-unit pier-abutment fixed partial denture. Population . 8. Small undercut (0.01 inch) existing in cervical third of abutment ; Distal extension abutments to engage a distobuccal (adjacent to edentulous space) undercut. Less stress values were recorded using the overdenture design in 13. Subsequent cementation gave even less service. It were examined ninety-one RPDs. 1995;4(3):200-4. • Because they lie in the middle of the span, they can act as a fulcrum for destructive forces. The area of maximum stress concentration at the pier abutment was decreased by the use of a nonrigid connector at the distal region of the second premolar. En nuestro medio, “Carta Odontológica”, editada en castellano para Perú y Latinoamérica, continuará con el mismo nombre mientras en inglés se denominará “The Peruvian Journal of Prosthodontics”, para los países de habla inglesa. The models were scaled to x2.5 to enhance visual analysis of the stress pattern. Valplast is a flexible base resin ideal for partial dentures or unilateral restorations. 14. load was applied on cusp tips of canine, pier abutment and artificial teeth to calculate the stress The placement of a nonrigid connector at the mesial surface of the pier is least desirable. An increase in plaque gingival and calculus index is seen in abutment teeth along with the teeth being more prone to inflammation. Psychological patient can tolerate fixed bridge rather than removable one. Mi agradecimiento al Consejo Directivo y a todo el Comité Editorial por su confianza para esta nueva labor y etapa de la revista así como a los autores de artículos. Get the latest public health information from CDC: https://www.coronavirus.gov. I lever causing stress on the terminal abutments and ultimately failure of the FPD and trauma to the periodontium. Successful selection of abutments for ... A non-rigid connector, a stress breaking mechanical union of retainer and pontic, is usually recommended in such situation. Physiologic tooth movement: Faciolingual 56 to 108μm. Premolar and molar abutments for free-end extension partial dentures and removable bridges. A typical removable partial denture (RPD, partial denture) consists of a cast framework with an acrylic base and replacement teeth (Figure 10-27). doi: 10.1371/journal.pone.0132552. BACKGROUND A removable partial denture (RPD) is a common treatment available for restoration of partially edentulous ridges. Isolated teeth when they cannot be made contiguous with the dental arch by means of a fixed restoration, often for bracing only, with no undercut engaged. Comparisons were made between wearers versus non-wearers regarding abutment versus non- abutment teeth and wearers with satisfactory dentures versus with problematic (or unsatisfactory) dentures. a dome shaped preparation on the pier abutment. Photoelastic materials were selected to represent the relative stiffness of 3- and 5-unit resin-bonded fixed partial dentures. It was assumed that collagen fibre density and orientation were responsible for these findings. Dental Abutments* Dental Casting Technique* Denture, Partial, Removable* Humans The principle focus is directed toward extension based … The test reveal that fixed-fixed design groupshowed equal distribution of strain while the non rigid design decrease the strain in the distalof the pier abutment but it concentrate it in the mesial of the posterior abutment. This may be due to the fact that a comprehensive treatment plan has not been considered essential. The cantilever fixed partial denture (FPD) is a restoration with one or more abutments at one end and unsupported at the other end. A frequent clinical situation, either in the maxillary or mandibular arch, is of a missing first premolar and first molar, resulting in fixed partial The denture is removed, and, with the aid of a suitable disclosing medium, the restoration is trimmed carefully to avoid reducing the intimate adaptation between the restoration and the removable partial denture. Abutments for removable partial dentures Abutments for immediate over denture -Summary INTRODUCTION: The need for replacing missing teeth is obvious to the patient when the edentulous … Summary & Conclusion 8.  |  We're here to support you and answer your dental questions so come say hello! It is more common for the last posterior abutment holding a free-end type RPD. Model C (MC) represented a 3-unit metallic fixed In some patients, the pattern of missing teeth may require the use of a fixed partial denture (FPD) with an intermediate pier abutment. A clinical situation may arise with 2 edentulous spaces and a single intact pier tooth. This abutment is called as a pier abutment. The hyperelastic approach allows the description of the mechanical response of the periodontum under short lasting loads, according to the characteristic non-linear behavior of the PDL. The mechanical response of the most deformable constituent, i.e. Emotional problems: The appointment for removable partial denture is shorter and less demanding to patient Young patients under the age of 17: This is because of high pulp horns and lack of clinical crown height. The analysis of the von Mises stress values revealed that maximum stress concentrations were located at the load areas for all models. 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. Intrusion 28μm. partial denture using the 2nd premolar and the canine as abutments, a conventional DERPD with A numerical model of human upper incisor and periodontum is proposed by means of the finite element method. Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. The indications for the use of non-rigid connector in fixed prosthodontics are [5] 1. Make two casts 11. Savion et al. To read the full-text of this research, you can request a copy directly from the authors. The effects of giving a fixed fixed designed bridge in such cases are evident and discussed. The purpose You can request the full-text of this article directly from the authors on ResearchGate. If the distal retainer and pontic are opposed by a removable partial denture or an edentulous ridge, while the two anterior retainers are opposed by natural dentition, allowing the distal terminal abutment to supraerupt. Special considerations Pier abutment Tilted molar abutment Abutment for the cantilever FPD -Endodontically treated teeth as abutments. 47. The cavity preparation is completed in the customary manner. J Prosthet Dent 2008;99:185-92. It has been postulated in literature that with the use of rigid connectors there are forces acting on terminal abutments with pier abutment acting as fulcrum. Patterns of stress for each loading condition were recorded photographically and evaluated. pier abutment act as a fulcrum. Introduction Although there are an increasing number of elderly dentate people in countries such as the USA and United Kingdom (1), survey data have indicated that at least one quarter of a million people under the age of 40 have removable partial dentures (2). A patient who has been wearing a removable partial denture (RPD) for quite some time presents with the following chief complaint: "My partial is loose; I think one of the teeth that holds it is broken." J Endod. The purpose of this study was to evaluate, by means of finite element method (FEM), the effects of rigid and nonrigid design types on stress distribution for 5-unit FPDs with pier abutments. PMID: 7024512 [PubMed - indexed for MEDLINE] MeSH Terms. INTRODUCTION. The aim of the present work is the analysis of mobility of human dentition under the action of physiological short-term loading by using a numerical approach. Three different types of load were evaluated: loading of all cusps to simulate maximum centric occlusion contacts, loading of the canine to simulate a single anterior contact, and loading of the second molar to simulate a posterior contact. Provisional restoration for abutment of an existing removable partial denture. [4][5], ... [3] Researchers had given different opinions about nonrigid connectors which are tabulated in Table 1. The technique is offered with full acknowledgement that it is a compromised treatment option. of Fixed Prosthodontics, ed 8. 1998 Nov;29(11):697-703. of this article is to summarize various treatment approaches to minimize the effect of forces in long span bridges given in cases Each of the six prostheses was subjected to six different loading conditions. Fabrication of anterior fixed partial denture with a semi rigid connector on the distal aspect of the pontic - ""Elucidating the Problem of Pier Abutment through the Use of a Fixed Movable Prosthesis - A Clinical Case Report"" Key words: functional waxing, crown, abutment, removable partial denture Introduction Poor design of both the artificial abutment crown and removable partial denture clasps on the crown, may contribute to increased mobility of the abutment tooth and possible bone loss around it, as well as, irritation of the soft tissue (1). One such clinical situation is existence of a pier abutment in between two edentulous areas. Considering the discussed results, it can be definitely said that the use of nonrigid connector decreases stresses at the connector and cervical region of the prosthesis but at the cost of increasing the stresses at the alveolar crest which subsequently increases the chances of bone resorption. Please enable it to take advantage of the complete set of features! Forces are transmitted through the abutments to the periodontium. The destruction of the crown underlying a partial denture can render useless an otherwise acceptable prosthesis unless some means can be found for building up the tooth under the prosthesis. Casey DM, Crowther DS, Lauciello FR. rigid connector to rehabilitate pier abutment case. Many times a dental practitioner comes across a situation where his clinical dexterity and knowledge can make the difference between a patient being delivered a removable or a fixed prosthesis. Theorie, Klinik, Technik. J Indian Prosthodont Soc 2005;5:99-102. The aim of the study is to evaluate the stress distribution in tooth supported 5-unit fixed partial denture (FPD) having tooth as pier abutment using rigid and nonrigid connectors respectively, under simultaneous and progressive loading. Get the latest research from NIH: https://www.nih.gov/coronavirus. The clinical situation demanded that two fixed partial dentures had to be fabricated with anterior fulfilling the requirement of aesthetics and posterior fulfilling the function of mastication.

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