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Journal articles on the topic 'Prostheses'
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1
Jones, L. E. "Prosthetic limb use in Australia 1981-1985 under the Free Limb Scheme." Prosthetics and Orthotics International 13, no. 2 (August 1989): 76–81. http://dx.doi.org/10.3109/03093648909078216.
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A study has been made of data on 19,421 prosthetic limbs prescribed for 12,143 Australians under the Free Limb Scheme in the years 1981–1985. These prostheses consisted of 18,119 legs and 1,302 arms. The mean age of the lower limb prosthesis user was 52.8 and the upper limb prosthesis user 31.3 years. Males outnumbered females by 3 to 1 in the upper limb prosthesis users, and 2.8 to 1 with lower limb prosthesis users. Below-knee prostheses, patellar-tendon-bearing and thigh-lacing prostheses, made up 58.7% of all prostheses prescribed in the time span. Below-elbow prostheses were the commonest upper limb prostheses with children being the most frequent users. Comparisons with other studies of large number of prosthesis users show an older mean age in Australia and more below-knee prosthesis users than in American studies.
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Nurisusilawati, Isnaini, and Muhammad Yusro. "Prosthesis Mapping and Forecasting as a Direction of Innovation in Prosthesis Product Development." OPSI 14, no. 1 (June 24, 2021): 30. http://dx.doi.org/10.31315/opsi.v14i1.4579.
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The objective of this study is to make a need assessment in the form of identifying trends in the need for prostheses and mapping the priority types of prostheses developed at Dr. R. Soeharso Orthopedic Public Hospital, Surakarta as a reference for innovation in the development of prosthesis products at Dr. R. Soeharso Orthopedic Public Hospital, Surakarta. The method used was descriptive analysis and moving average forecasting of historical data on the use of prostheses. From the results of the descriptive analysis, it was found that the most common types of the prosthesis were under the knee prostheses and the types of prostheses that mostly used imported components were finger prostheses and prostheses that have been developed locally which were lower and upper knee prostheses and also Syme. The results of the prediction of the number of prostheses showed a stable trend and tended to increase slightly with the MAD error rate of 2.375 and MSE of 10.378 and MAPE of 36%. With this accuracy, the results of the forecasting can be used as a reference for the hospital to make supplies of prosthesis components in the next period so that the time for making prostheses can be shortened. Meanwhile, for the development of the direction of innovation, recommendations for the type of prosthesis that is a priority to be developed at Dr. R. Soeharso Orthopedic Public Hospital, Surakarta is an innovation of under-knee and finger prostheses by implementing low-cost product designs.
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Martin, Angela D., Colin L. W. Driscoll, Christopher P. Wood, and Joel P. Felmlee. "Safety Evaluation of Titanium Middle Ear Prostheses at 3.0 Tesla." Otolaryngology–Head and Neck Surgery 132, no. 4 (April 2005): 537–42. http://dx.doi.org/10.1016/j.otohns.2004.12.003.
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OBJECTIVE: To assess the magnetic resonance imaging (MRI) safety of titanium middle ear prostheses at 3.0 tesla (T). STUDY DESIGN AND SETTING: Titanium middle ear prostheses from 3 commercial vendors were examined for magnetic field interactions at 3 T. Initially, ex vivo studies were performed to test for rotational motion and forward displacement (translational motion) of the prostheses in a static magnetic field. If movement was observed during this screening study, then the prosthesis was tested to determine the translational or rotational force acting upon the prosthesis. In addition to testing for prosthesis displacement, temperature changes of the prostheses were measured to assess for radiofrequency heating during imaging. RESULTS: Twenty-one of the 24 titanium prostheses tested revealed no movement when tested in the 3 T static magnetic field. Three prostheses revealed minimal movement during the screening study. A translational force test (string test) was performed upon these 3 prostheses, and the measured angle of displacement was used to determine the force. This calculated force acting upon each prosthesis was essentially zero. Therefore, we conclude that the magnetic field interaction is negligible. A positive control with a ferromagnetic stainless steel prosthesis demonstrated obvious displacement during the screening study, as well as deflection of the prosthesis by 90° in the translational force test. Last, heating of the titanium prostheses did not occur in the 7 models tested. CONCLUSIONS: Middle ear prostheses made from titanium are safe, neither deflecting nor heating during magnetic resonance examinations conducted at 3 T. EBM rating: C-1.
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Kuyper, M.-A., M. Breedijk, A. H. M. Mulders, M. W. M. Post, and A. J. H. Prevo. "Prosthetic management of children in the Netherlands with upper limb deficiencies." Prosthetics and Orthotics International 25, no. 3 (December 2001): 228–34. http://dx.doi.org/10.1080/03093640108726606.
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The aim of the study was to assess which children with congenital and acquired upper limb deficiencies were fitted with prostheses, what types of prostheses were prescribed as first, second and third prostheses, at what age prostheses were first prescribed and how long the children wore their prostheses.The design was a retrospective chart review at De Hoogstraat Rehabilitation Centre, Utrecht (The Netherlands). Medical files of all patients with congenital or acquired upper limb deficiencies who visited the outpatient clinic between 1972 and 1996 were reviewed, collecting data on patient characteristics, prosthesis prescription and use of prostheses.The group included 224 children, of whom 206 (92%) had congenital deficiencies. Of all children with unilateral congenital deficiencies, 54% had been fitted with prostheses, against 3% of all children with bilateral congenital deficiencies and 67% of all children with acquired deficiencies. In the congenital group, it was children with transverse defects of one-third or two-thirds of the forearm who had most frequently had prostheses fitted (85% of the children). Most of the children with unilateral congenital deficiencies had received passive prostheses as their first prostheses (80 of the 90 prescribed prostheses); children with acquired defects usually had active prostheses (8 of the 12 prescribed prostheses). Body-powered prostheses were most commonly prescribed as the second type of prosthesis.In the group of 119 children who had been seen before the age of 4 years and had been followed for at least three years, 63 had been fitted with one or more prostheses at a mean age of 2.6 (SD 2.5) years. Of the 46 children with congenital defects, 30 had been fitted with prostheses, and at the age of 12, two-thirds of them still used their prostheses (63%, 19/30).“De Hoogstraat” rehabilitation centre uses a restrained prosthesis prescription policy, depending on the type of deficiency and the expected functional benefits. Data on prosthesis use are encouraging, although a follow-up study is required to determine the functional outcome for prosthesis users and non-users.
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Kim, Jaewon, and Du-Hyeong Lee. "Influence of the Postcuring Process on Dimensional Accuracy and Seating of 3D-Printed Polymeric Fixed Prostheses." BioMed Research International 2020 (November 13, 2020): 1–7. http://dx.doi.org/10.1155/2020/2150182.
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The postcuring process is essential for 3-dimensional (3D) printing of photopolymer-based dental prostheses. However, the deformation of prostheses resulting from the postcuring process has not been fully investigated. The purpose of this study was to evaluate the effects of different postcuring methods on the fit and dimensional accuracy of 3D-printed full-arch polymeric fixed prostheses. A study stone model with four prosthetic implant abutments was prepared. A full-arch fixed dental prosthesis was designed, and the design was transferred to dental computer-aided manufacturing (CAM) software in which supports were designed to the surface of the prosthesis design for 3D printing. Using a biocompatible photopolymer and a stereolithography apparatus 3D printer, polymeric prostheses were produced ( N = 21 ). In postcuring, the printed prostheses were polymerized in three different ways: the prosthesis alone, the prosthesis with supports, or the prosthesis on a stone model. Geometric accuracy of 3D-printed prostheses, marginal gap, internal gap, and intermolar distance was evaluated using microscopy and digital techniques. Kruskal-Wallis and Mann-Whitney U tests with Bonferroni correction were used for the comparison of results among groups ( α = 0.05 ). In general, the mean marginal and internal gaps of cured prostheses were the smallest when the printed prostheses were cured with seating on the stone model ( P < 0.05 ). With regard to the adaptation accuracy, the presence of supports during the postcuring process did not make a significant difference. Error in the intermolar distance was significantly smaller in the model seating condition than in the other conditions ( P < 0.001 ). Seating 3D-printed prosthesis on the stone model reduces adverse deformation in the postcuring process, thereby enabling the fabrication of prostheses with favorable adaptation.
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Rout, S. N. "Lightweight prostheses for bilateral below-elbow amputees." Prosthetics and Orthotics International 17, no. 2 (August 1993): 126–29. http://dx.doi.org/10.3109/03093649309164368.
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In view of the anticipated activity of the patient and working environment, lightweight prostheses were designed for an adult female, bilateral below-elbow (BE) amputee at NIRTAR to provide the greatest degree of function. The prostheses were fabricated using lightweight materials and new techniques. Depending on the stump length there were two different types of lightweight prostheses designed and successfully used, (1) an endoskeletal BE prosthesis and (2) an exoskeletal BE prosthesis. After periodic follow-up and evaluation the function of the prostheses was found to be most satisfactory. By reducing the weight considerably compared to other available alternatives, it is more likely that the amputee will make use of the prostheses to efficiently perform various activities. The new prosthesis designs may counteract the high rejection rate of old conventional ones and the principle may be applied to the fabrication of all BE prostheses.
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SAGERMAN, S. D., J. G. SEILER, L. L. FLEMING, and E. LOCKERMAN. "Silicone Rubber Distal Ulnar Replacement Arthroplasty." Journal of Hand Surgery 17, no. 6 (December 1992): 689–93. http://dx.doi.org/10.1016/0266-7681(92)90202-d.
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We retrospectively reviewed 42 patients who underwent resection of the distal ulna with implantation of a silicone rubber ulnar head prosthesis (45 wrists). Two prostheses were used: the original Swanson prosthesis, and a prosthesis of our own design. Follow-up X-rays showed migration or breakage of 63% of the prostheses. No statistically significant correlation existed between the quality of functional outcome and the integrity of the prostheses. There was no significant difference between pre-operative and post-operative range of motion for the entire group or between patients with broken or intact prostheses. Histological confirmation of silicone synovitis was documented in one patient who required implant removal. We suggest that destabilization and breakage of prostheses result from fatigue failure secondary to the torque generated at the distal radio-ulnar joint during repeated pronation and supination. Use of a silicone rubber ulnar head prosthesis following distal ulna resection is not recommended.
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Leow, M. E. L., W. K. M. Ng, B. P. Pereira, A. K. Kour, and R. W. H. Pro. "Metamerism in aesthetic prostheses under three standard illuminants — TL84, D65 and F." Prosthetics and Orthotics International 23, no. 2 (August 1999): 174–80. http://dx.doi.org/10.3109/03093649909071630.
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This study looks at the effect of metamerism in colour-matching and the assessment of multi-layered silicone rubber finger prostheses. The aim was to identify the choice of illuminants for colour matching the prostheses that would give rise to the least metameric effect between the prostheses and the human skin or the best colour match. The prostheses were prepared and colour matched to a fair-skinned subject under 3 reference illuminants — TL84, D65, F and a combination of illuminants — TL84, D65 and F. The prostheses were then measured for colour using a spectrophotometer based on the CIE indices L∗ a∗, b∗ with each prosthesis assessed separately against the subject's index finger under the reference illuminants-TL84, D65 and F. The prostheses were also assessed by a panel of 50 observers and scored according to colour-match. Colour differences between the skin and prosthesis were measured in the illuminant under which the prostheses were prepared and then under the other reference illuminants. A relationship was obtained between the measured mean colour difference, δE∗, and the mean visual assessment score for each prosthesis. This paper points out the concerns related to the optical phenomenon of metamerism with the colour pigments used. This can affect the colour match of the prosthesis as perceived by the patient. The findings seem to suggest that this metameric colour difference can be minimised if the prosthesis is matched under a combination of lights, which were found to give the best-perceived match.
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Arias de la Torre, Jorge, Olga Martínez, Kayla Smith, Miquel Pons-Cabrafiga, Daniel Prieto-Alhambra, Jose Valderas, Vicente Martin, et al. "PP70 Identification Of Prostheses With Worse Than Expected Outcomes." International Journal of Technology Assessment in Health Care 35, S1 (2019): 51. http://dx.doi.org/10.1017/s0266462319002198.
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IntroductionMonitoring the effectiveness of knee and hip arthroplasties could be useful at the clinical, economic, and patient levels. In Catalonia, there is currently no systematic monitoring of the different prostheses available. The aims of this study were to propose an approach for the systematic identification of knee and hip prostheses with the highest revision rates, and to identify those with the poorest outcomes.MethodsData recorded from January 2005 to December 2016 were considered from 53 out of the 61 public hospitals in Catalonia included in the Catalonian Arthroplasty Register (RACat). Specific prostheses were classified by joint, type, fixation, and, in total hip prostheses, the bearing surface. Prostheses with the worst outcomes were identified using a three-step approach, based on previous literature: (i) screening using Poisson models; (ii) comparison of prostheses using adjusted Cox models; and (iii) consensus-based review by a panel of orthopedic surgeons to detect possible sources of bias. After this process, selected prostheses were provisionally labeled as having the poorest outcomes. This process will be repeated periodically within the RACat to definitively classify the prostheses.ResultsAfter first two steps, ten knee prostheses and eight hip prostheses were identified. After the panel discussion (third step), one knee and one hip prosthesis were excluded from the final list. The knee prosthesis was excluded because it was a unicompartmental implant, while the hip prosthesis was excluded because it was a monoblock implant. Finally, nine knee prostheses and seven hip prostheses were provisionally identified as having the worst results relative to other available prostheses. These results await confirmation in subsequent analyses.ConclusionsThis study contributed to the current need to identify hip and knee prostheses whose outcomes might be worse than expected. This identification could have an impact at the patient, surgeon, industry, and stakeholder levels.
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Kalaignan, Parithimar, and Syed Ershad Ahmed. "Impact of mandibular resection guidance prostheses on oral health related quality of life (OHRQoL) - A prospective study." LIAQUAT MEDICAL RESEARCH JOURNAL 3, no. 3 (September 29, 2021): 79–85. http://dx.doi.org/10.38106/lmrj.2021.3.3-06.
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This prospective study was aimed to measure the impact of mandibular resection guidance prostheses on oral health-related quality of life (OHRQol). A total of 35 patients with mandibulectomy defects were included. All the patients were rehabilitated with mandibular resection guidance prostheses respectively. These patients were subjected for assessment of OHRQol. The assessment was done by using OHIP-Edent-19 and a novel scale—maxillofacial prosthesis performance scale (MFPPS). The assessment was done on all the patients at two weeks and three months of prosthesis function. The scores of OHIP-Edent, and MFPPS for mandibular resection guidance prostheses after two weeks were 33.20and 18.74 respectively. The scores of OHIP-Edent and MFPPS for mandibular resection guidance prostheses prostheses at three months were 27.71and 15.20 respectively. These findings show significant improvements of prosthesis in terms of functional, physical, psychological and social parameters after long-term follow-up (3 months).
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Zuniga, Jorge. "3D Printed Antibacterial Prostheses." Applied Sciences 8, no. 9 (September 14, 2018): 1651. http://dx.doi.org/10.3390/app8091651.
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The purpose of the current investigation was two-fold: (i) to describe the development of 3D printed prostheses using antibacterial filaments and (ii) to verify the antibacterial properties of the 3D printed prostheses. Three-dimensional printed finger prostheses were manufactured using PLACTIVETM antibacterial 3D printing filaments. Two adults with left index finger amputations at the proximal phalanx were fitted with a customized 3D printed finger prosthesis manufactured with an antibacterial filament. The manual gross dexterity was assessed during the Box and Block Test. Patient satisfaction was assessed using the Quebec User Evaluation of Satisfaction with assistive Technology (QUEST 2.0). Bacterial analysis of the 3D printed prostheses was performed by two independent laboratories against Staphylococcus aureus and Escherichia coli (ISO 22196). Two customized 3D printed partial finger prostheses were manufactured using a 3D printed antibacterial filament. The bacterial analysis showed that PLACTIVETM with 1% antibacterial nanoparticles additives was up to 99.99% effective against Staphylococcus aureus and Escherichia coli. The manual gross dexterity assessed was improved after using the 3D printed partial finger prosthesis. The research subjects indicated that they were “quite satisfied” to “very satisfied” with the 3D printed partial finger prosthesis. The present investigation showed that the antibacterial 3D printed filament can be used for the development of functional and effective antibacterial finger prostheses.
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Yung, M. "Titanium prosthesis with malleus notch: a study of its ‘user-friendliness’." Journal of Laryngology & Otology 121, no. 10 (February 26, 2007): 938–42. http://dx.doi.org/10.1017/s0022215107005944.
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‘User-friendliness’ is an important factor in the choice of ossicular prosthesis. The current titanium prostheses have a flat, open head plate and are designed to sit under the tympanic membrane. Previously, the author had designed titanium prostheses with a malleus notch extension at the head plate. The present study aimed to assess whether these customised prostheses were user-friendly, compared with conventional prostheses.Fourteen surgeons were recruited to examine the user-friendliness of several ossicular prostheses. They performed ossiculoplasties on temporal bones and rated the user-friendliness of the malleus notch prosthesis against that of some of the more popular conventional ossicular prostheses.For malleus-stapes assembly, eight out of 13 surgeons preferred the malleus notch prosthesis to the Düsseldorf and Goldenberg designs. For malleus-footplate assembly, six out of 10 surgeons preferred the malleus notch prosthesis to the Düsseldorf and Richards designs. Most of the surgeons stated that the reconstruction was more stable using the malleus notch prosthesis.
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Joyce, T. J., and A. Unsworth. "NeuFlex metacarpophalangeal prostheses tested in vitro." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 219, no. 2 (February 1, 2005): 105–10. http://dx.doi.org/10.1243/095441105x9192.
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This paper describes the testing of three single-piece silicone NeuFlex metacarpophalan-geal prostheses in a finger function simulator and describes the resulting modes of prosthesis failure. In all cases, failure was due to imminent fracture of the prosthesis across the pivot of the central hinge section. This result is in contrast with previous in-vitro and in-vivo experience with single-piece silicone Swanson and Sutter metacarpophalangeal prostheses, which both tend to fracture at the junction of the distal stem and the hinge. In comparison with earlier in-vitro simulator tests of the Sutter metacarpophalangeal prosthesis, the NeuFlex prostheses showed a greater longevity before fracture. To date, no other reports of fracture of the NeuFlex metacarpophalangeal prosthesis have been reported, either in vitro or in vivo.
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Tizzani, A., G. Bodo, A. De Zan, P. Piana, and G. Casetta. "Urethral prostheses. An overview." Urologia Journal 62, no. 3 (June 1995): 340–46. http://dx.doi.org/10.1177/039156039506200305.
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The first report in Literature dealing with an endourethral prosthesis in the treatment of recurrent bulbar strictures dates back to 1988. Since then other prostheses with different design and materials have been proposed. The Urolume by A.M.S., the first ever, is used worldwide and its indications are better known due to a longer follow-up time. In 6 months epithelium covers the prosthesis and it is generally well tolerated, but some Authors do not agree with its use in the treatment of traumatic strictures. Titanium prostheses have been used in few cases. A temporary steel alloy prosthesis, the Urocoil, has been proposed recently. Not enough follow-up data are available about this and the new “thermic memory” prosthesis. The bigdegradable prosthesis, used till now only on rabbits, actually represents the new frontier in the treatment of urethral strictures.
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Nazari, Hossein, Paulo Falabella, Lan Yue, James Weiland, and Mark S. Humayun. "Retinal Prostheses." Journal of VitreoRetinal Diseases 1, no. 3 (April 20, 2017): 204–13. http://dx.doi.org/10.1177/2474126417702067.
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Artificial vision is restoring sight by electrical stimulation of the visual system at the level of retina, optic nerve, lateral geniculate body, or occipital cortex. The development of artificial vision began with occipital cortex prosthesis; however, retinal prosthesis has advanced faster in recent years. Currently, multiple efforts are focused on finding the optimal approach for restoring vision through an implantable retinal microelectrode array system. Retinal prostheses function by stimulating the inner retinal neurons that survive retinal degeneration. In these devices, the visual information, gathered by a light detector, is transformed into controlled patterns of electrical pulses, which are in turn delivered to the surviving retinal neurons by an electrode array. Retinal prostheses are classified based on where the stimulating array is implanted (ie, epiretinal, subretinal, suprachoroidal, or episcleral). Recent regulatory approval of 2 retinal prostheses has greatly escalated interest in the potential of these devices to treat blindness secondary to outer retinal degeneration. This review will focus on the technical and operational features and functional outcomes of clinically tested retinal prostheses. We will discuss the major barriers and some of the more promising solutions to improve the outcomes of restoring vision with electrical retinal stimulation.
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Toti, Paolo, Simone Marconcini, Giammarinaro Enrica, Giorgio Pedretti, Antonio Barone, and Ugo Covani. "The Influence of Prosthesis Design on the Outcomes of Tooth Implants Immediately Placed and Loaded by Means of One-Piece Titanium Machined Restoration." Journal of Oral Implantology 44, no. 2 (April 1, 2018): 87–93. http://dx.doi.org/10.1563/aaid-joi-d-17-00152.
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Our purpose was to evaluate the occurrence of complications and the degree of bone loss in a cohort of patients treated with fixed prostheses supported by immediately loaded dental implants. The primary aim was to compare partial versus full-arch fixed dental prostheses. We then tested the effect of sinus lifting. In the present retrospective cohort study, the patients had their implants restored with fixed dental prostheses supported by dental implants positioned in the posterior maxilla and mandible. When necessary, the maxillary sinuses were grafted with particulate autogenous bone. Patients were then ranked according to the following predictors: length of prosthesis, crown-to-implant ratio, number of crowns to number of implants ratio, and presence of sinus lifting. Outcomes were evaluated for up to 2 years regarding the peri-implant marginal bone loss and implant/prosthesis survival rates. Fifty-eight subjects (209 implants) were rehabilitated with 25 fixed full-arch prostheses and 33 partial fixed dental implant bridges (16 supported by implants placed in grafted sinus). The mean marginal bone loss for implants supporting partial fixed dental prostheses amounted to 0.81 mm, whereas that for implants within the group of full-arch fixed dental prostheses was 1.21 mm; the comparison of the levels in the 2 groups showed a significant difference (P = .0055). A statistically significant difference (P = .0006) was found between the bone loss around maxillary implants (1.53 mm) and the bone loss around mandibular implants (1.10 mm). Two implants and 4 prostheses failed; 2-year survival rates of partial and of full-arch fixed dental prostheses, respectively, were 94.1% and 96%. Bone loss in full-arch prostheses appeared to be higher than in that of partial prosthesis. Implant-supported prostheses in the maxillae exhibited a bone loss higher than that registered in mandibles.
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Chan, W. T. "REVIEW OF THE COMPLICATIONS IN PROSTHESIS MAKING & SERVICING." Asian Journal Of Medical Technology 2, no. 2 (August 5, 2022): 75–88. http://dx.doi.org/10.32896/ajmedtech.v2n2.75-88.
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Prostheses are intended to restore the human body's appearance and return some functions lost due to the loss of limbs. The prosthesis industry exists for this purpose, as well as the servicing of the prostheses. However, there are complications in the design and installation of prostheses, as well as servicing them. Prosthesis usage is subjected to the specific circumstances of the recipient and is dependent on medical coverage for long-term servicing. The relatively low number of cases involving prostheses compared to other medical cases and the circumstantial differences between these cases prevent in-depth and comprehensive studies of the industry, preventing the establishment of standardized best practices. Despite this, research and development of improvements for recipients' problems continue, utilizing the latest technologies to address technical complications. This article consolidates the present-day complications of prosthesis making and servicing.
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Jensen, J. Steen, and S. Heim. "Evaluation of polypropylene prostheses designed by the International Committee of the Red Cross for transtibial amputees." Prosthetics and Orthotics International 24, no. 1 (April 2000): 47–54. http://dx.doi.org/10.1080/03093640008726521.
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Thirtytwo (32) trained prosthesis users with 34 transtibial amputations, mostly due to war, were fitted with prostheses fabricated from polypropylene (PP) prosthetic components designed and manufactured by the International Committee of the Red Cross (ICRC). The patients were followed prospectively for 10 and 19 months. All but one patient had at least one other type of prosthesis to compare with. Twentyeight (28) patients were satisfied with the PP prosthesis. Among these 23 found the PP prosthesis the preferred artificial limb, and one patient found the PP limb equal to the aluminium prosthesis previously in use. In 6/28 patients having an aluminium (ALU) prostheses this was found the best, and the 1 already mentioned found it equivalent to the new technology. In only 1/20 cases having an Automated Fabrication of Mobility Aids (AFMA) prosthesis available this was found the best. One (1) doubleamputee found all three designs equal. Minor failures of the PP prostheses were encountered; in 4 cases small cracks in the hard socket; in 3 cases cracks of the cosmetic socket seam. From an overall prospect the PP technology can be recommended for transtibial prostheses.
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Hansson, E., K. Hagberg, M. Cawson, and T. H. Brodtkorb. "Patients with unilateral transfemoral amputation treated with a percutaneous osseointegrated prosthesis." Bone & Joint Journal 100-B, no. 4 (April 2018): 527–34. http://dx.doi.org/10.1302/0301-620x.100b4.bjj-2017-0968.r1.
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Aims The aim of this study was to compare the cost-effectiveness of treatment with an osseointegrated percutaneous (OI-) prosthesis and a socket-suspended (S-) prosthesis for patients with a transfemoral amputation. Patients and Methods A Markov model was developed to estimate the medical costs and changes in quality-adjusted life-years (QALYs) attributable to treatment of unilateral transfemoral amputation over a projected period of 20 years from a healthcare perspective. Data were collected alongside a prospective clinical study of 51 patients followed for two years. Results OI-prostheses had an incremental cost per QALY gained of €83 374 compared with S-prostheses. The clinical improvement seen with OI-prostheses was reflected in QALYs gained. Results were most sensitive to the utility value for both treatment arms. The impact of an annual decline in utility values of 1%, 2%, and 3%, for patients with S-prostheses resulted in a cost per QALY gained of €37 020, €24 662, and €18 952, respectively, over 20 years. Conclusion From a healthcare perspective, treatment with an OI-prosthesis results in improved quality of life at a relatively high cost compared with that for S-prosthesis. When patients treated with S-prostheses had a decline in quality of life over time, the cost per QALY gained by OI-prosthesis treatment was considerably reduced. Cite this article: Bone Joint J 2018;100-B:527–34.
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LEMOYNE, ROBERT. "ADVANCES REGARDING POWERED PROSTHESIS FOR TRANSTIBIAL AMPUTATION." Journal of Mechanics in Medicine and Biology 15, no. 01 (February 2015): 1530001. http://dx.doi.org/10.1142/s021951941530001x.
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The necessity for developing advanced prostheses are apparent in light of projections that the forecast for the number of people enduring amputation will double by the year 2050. The transtibial powered prosthesis that enables positive mechanical work about the ankle during the powered plantar flexion aspect of stance phase constitutes a paradigm shift in available transtibial prostheses. The objective of the review is to advocate the state of the art regarding the transtibial powered prosthesis. The historic origins of the prosthesis and motivations for amputation are clarified. The phases of gait and the compensatory mechanisms and asymmetries inherent with passive transtibial prostheses are described. The three general classes of transtibial prosthesis (passive, energy storage and return and powered prostheses) are defined. Subsystems that are integral to the powered prosthesis are explained, such as the series elastic actuator and control architecture. Gait analysis systems and their role for the test and evaluation of energy storage and return and powered prostheses are demonstrated. Future advanced concepts; such as the integration of titin into novel muscle models that account for force enhancement and force depression including their implications for cutting edge bio-inspired actuators are elucidated. The review accounts for the evolution of the prosthetic device with regards to the scope of transtibial amputation and assesses the current state-of-the-art.
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Arias, S. A., J. R. T. Blanco, J. V. Doretto, G. L. T. Vieira, H. P. Oliveira, and C. M. F. Rezende. "Modified cementless total coxofemoral prosthesis: development, implantation and clinical evaluation." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 65, no. 6 (December 2013): 1660–72. http://dx.doi.org/10.1590/s0102-09352013000600012.
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The aim of this study was to modify canine coxofemoral prostheses and the clinical evaluation of the implantation. Fifteen canine hips and femora of cadavers were used in order to study the surface points of modification in prostheses and develop a perforation guide. Femoral stems and acetabular components were perforated and coated with biphasic calcium phosphate layer. Twelve young adult male mongrel dogs were implanted with coxofemoral prostheses. Six were operated upon and implanted with cemented canine modular hip prostheses, establishing the control group. The remaining six were implanted with a novel design of cementless porous tricalcic phosphate-hydroxyapatite coated hip prostheses. Clinical and orthopedic performance, complications, and thigh muscular hypotrophy were assessed up to the 120th post-operatory day. After 120 days, animals with cementless prostheses had similar clinical and orthopedic performance compared to the cemented group despite the increased pain thigh hypotrophy. Animals that underwent cementless hip prosthesis evidenced more pain, compared to animals with cemented hip prosthesis that required longer recuperation time. No luxations, two fractures and two isquiatic neurapraxies were identified in the course of the study. Using both the cemented and the bioactive coated cementless model were suitable to dogs, showing clinical satisfactory results. Osseointegration and biological fixation were observed in the animals with the modified cementless hip prosthesis.
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Rahman, Md Mahbubur, Mohammad Abid, Utpalendu Biswas, and Rozina Akter. "Clinical evaluation of crown and bridge prosthesis placed in patients attended in the Bangabandhu Sheikh Mujib Medical University." Bangabandhu Sheikh Mujib Medical University Journal 15, no. 2 (January 16, 2023): 80–83. http://dx.doi.org/10.3329/bsmmuj.v15i2.60859.
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The proper diagnosis and clinical assessment are essential when dealing with the complications of fixed restorations in dental prosthesis. This cross-sectional study was carried out to evaluate clinically the crown and bridge prosthesis among the patients attending in the Department of Prosthodontics, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh. A total of 50 patients with full veneer crowns or bridges were selected. Clinical assessment for the contour of the prosthesis, nature of the contact of the prosthesis, type of occlusal contact in ICP were done. Among the study subjects, 44% and 52% of the prostheses were over-contoured buccally and lingually, respectively. The prostheses contacted with adjacent tooth mesially at occlusal one-third in 58%, middle one-third in 40% & cervical one-third in 2% cases. The prostheses contacted with adjacent tooth distally at occlusal one-third in 52%, middle one-third in 44% & nothing abnormality detected in 4%. About half of prostheses (54%) contacted with an opposite tooth at the level of central fossa whereas 40% at buccal to central fossa and only a few numbers (6%) at lingual/palatal to central fossa. The nature of proximal contact was normal in 52%, tight in 36%, and open in 12% of the prostheses. As the prostheses cemented in the patient's mouth were not up to the accepted clinical standards, so enrichment of knowledge about prosthetics are needed and responsibilities should be ensured. BSMMU J 2022; 15(2): 80-83
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Free, Rolien H., G. Jolanda Elving, Ranny van Weissenbruch, Henk J. Busscher, Henny C. vander Mei, and Frans W. J. Albers. "Biofilm Formation on Voice Prostheses: In vitro Influence of Probiotics." Annals of Otology, Rhinology & Laryngology 110, no. 10 (October 2001): 946–51. http://dx.doi.org/10.1177/000348940111001010.
Full textAbstract:
In order to determine the influence of probiotic bacteria on biofilm formation on Groningen and Provox 2 voice prostheses in an artificial throat, we grew biofilms on both types of voice prostheses and exposed them 3 times daily to a probiotic bacterial suspension. As a control, we perfused an artificial throat with phosphate-buffered saline solution. Perfusion with Lactococcus lactis 53 suspension reduced the percentage numbers of bacteria and yeasts, respectively, on the Groningen prostheses to 17% and 22% and on the Provox 2 prostheses to 19% and 45%, compared to the number of colony-forming units on the control prosthesis, which was set at 100%. A suspension of Streptococcus thermophilus b reduced the percentage numbers of bacteria and yeasts, respectively, on the Groningen prostheses to 53% and 33% and on the Provox 2 prostheses to 14% and 0%, as compared to the control prosthesis. All other probiotic strains tested caused some reduction in the percentages of bacteria or yeasts, but strong differences between the types of prostheses were observed. In conclusion, L lactis 53 and S thermophilus b strongly reduce the occurrence of yeasts and bacteria in voice prosthetic biofilms.
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Silenko, B. Y., V. M. Dvornik, and Y. I. Silenko. "CONDITIONAL TISSUE CONDITION IN PATIENTS WITH PROSTHETIC DENTISTS IN THE PROCESS OF ORTHOPEDIC TREATMENT WITH PROSTHESES MODIFIED BY NANOMATER." Ukrainian Dental Almanac, no. 4 (December 8, 2021): 20–25. http://dx.doi.org/10.31718/2409-0255.4.2021.04.
Full textAbstract:
The main cause of prosthetic stomatitis belongs to the chemical and toxic action of the residual monomer of the prosthesis base, which is a protoplasmic poison. Occurrence of prosthetic stomatitis depends not only on quality of production of prosthesis in laboratory though at non-observance of technology indicators of residual monomer can reach 2-5%, but also at individual intolerance at its minimum concentration in a prosthesis after polymerization - 0,2-0 .5%.
The aim of our study was to increase the effectiveness of orthopedic treatment of patients with prosthetic stomatitis by coating the plastic of removable prostheses with nanoscale materials.
Materials and methods. To solve this goal, we studied the condition of the tissues of the prosthetic place of patients with prosthetic stomatitis with prosthetic removable prostheses with modified plastic. Orthopedic dental treatment of 50 people was examined and performed, including 25 people (the second group, prostheses were not covered with nanoparticles) and 25 people (the third group, prostheses were covered with nanoparticles). The first control group consisted of 10 people without signs of pathology.
Prior to treatment, all patients had removable acrylic plastic dentures. The reason for seeking orthopedic care was a violation of masticatory function and the inability to use previously made prostheses due to the development of pain in the soft tissues of the prosthetic place. Complaints of pain were observed in all patients of varying intensity, impaired fixation and stabilization of the prosthesis due to swelling of the mucous membrane of the soft tissues of the prosthetic place, heartburn and dryness were observed in 90% of patients. Complaints were also about speech and aesthetic defects.
Patients of III group after two weeks of using prostheses were coated with the inner surface of the prosthesis, which is in direct contact with the mucous membrane of the prosthetic place with molecules of fullerene C60, by magnetron sputtering. For this purpose, the prostheses were removed from the patients for several days and returned after the coating with the nanomaterial, after which the observation was continued.
The results. After coating the prostheses in patients of group III with Fullerene C60, we observed the disappearance of inflammation of the mucous membrane under the prosthesis and patients noted the absence of discomfort. Рatients in II group had a negative dynamics in 80% and had diffuse inflammation of the mucous membrane under the prosthesis. Within 3 months of use, 18 patients (72%) in II group reported that they stopped using removable dentures during the day, due to unpleasant pain under the prosthesis,
and used only during meals and during conversations. In contrast to II group, patients in III group did not notice discomfort when using plate prostheses.
Conclusions. Obtained in the course of the work convincingly prove the effectiveness of the use of removable plate prostheses with nanocoating for the treatment and prevention of prosthetic stomatitis in patients. This is evidenced by the data of objective examination and the disappearance of complaints from patients.
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Mai, Hai Yen, Jae-Min Seo, Jae-Kwang Jung, and Du-Hyeong Lee. "Strategic Use of CAD-CAM Interim Restoration for the Recovery of the Vertical Dimension of Occlusion in the Posterior Partially Edentulous Jaw." Applied Sciences 10, no. 21 (October 31, 2020): 7735. http://dx.doi.org/10.3390/app10217735.
Full textAbstract:
Occlusal contact loss occasionally occurs following the placement of implant-supported fixed dental prostheses in the posterior region. This complication is caused by the change in the vertical dimension of occlusion after the recovery of mastication. The change is probably related to the prosthesis sinking phenomenon and previous mandibular dislocation. The use of interim prostheses could help re-establish the vertical dimension of occlusion. The definitive prostheses can then be accurately fabricated using digital techniques in the newly established vertical dimension. In this case report, we introduce a protocol incorporating a computer-aided design and computer-aided manufacturing (CAD-CAM) interim prosthesis and digital techniques to minimize the occurrence of unexpected initial occlusal changes in the prosthetic treatment of implant-supported prostheses in the posterior region.
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Anitua, Eduardo, Carlos Flores, Laura Piñas, and Mohammad Hamdan Alkhraisat. "Frequency of Technical Complications in Fixed Implant Prosthesis: The Effect of Prosthesis Screw Emergence Correction by Computer-Aided Design/Computer-Aided Manufacturing." Journal of Oral Implantology 44, no. 6 (December 1, 2018): 427–31. http://dx.doi.org/10.1563/aaid-joi-d-17-00229.
Full textAbstract:
Computer-aided design/computer-aided manufacturing (CAD-CAM) technology permits the angular correction of screw emergence into the prosthesis; however, there is lack of controlled clinical studies that assess the frequency of technical complications in angled screw channel restorations. This controlled clinical study was designed to assess technical incidences in angled screw channel restorations. Patients who underwent placement of implant prosthesis between November 2014 and December 2015 were screened. The patients were selected if they received a prosthesis with up to 30° correction of the prosthesis screw emergence and had at least 1 nonangulated prosthesis (screw retained). All prostheses were located completely/partially in the posterior region. The frequency of technical complications was the principal variable. A total of 52 patients with a mean age of 62 ± 10 years participated, with a total of 110 prostheses (55 in the test group and 55 in the control group). A total of 11 technical complications occurred (7 in the test group and 4 in the control group). These differences were not statistically significant. All prostheses in both groups survived the follow-up. The correction of the screw emergence into the prosthesis has not increased the risk of technical complications in CAD-CAM implant prostheses.
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Nai, Gisele Alborghetti, Denis Aloísio Lopes Medina, Cesar Alberto Talavera Martelli, Mayla Silva Cayres de Oliveira, Isadora Delfino Caldeira, Bruno Carvalho Henriques, Maria Júlia Schadeck Portelinha, et al. "Affinity of Staphylococcus aureus for prostheses colonization compared to other bacteria. An in vitro study." Research, Society and Development 10, no. 5 (May 1, 2021): e15310514701. http://dx.doi.org/10.33448/rsd-v10i5.14701.
Full textAbstract:
Staphylococcus aureus biofilms have been recognized as a leading cause of multiple infections, including implant-associated infections and chronic wounds. We evaluated the colonization capacity of two distinct textured prostheses by different bacterial strains. Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Proteus mirabilis and Enterococcus faecalis were evaluated. Initially, the hydrophobicity and biofilm formation capacity were determined. Subsequently, 20 fragments of vascular prosthesis and 20 silicone prostheses were embedded in suspensions with the microorganisms and incubated. The prostheses were then sown in culture medium and incubated for 48 hours. Petri dishes were photographed and analyzed by fractal dimension. The Kruskal-Wallis test and the Dunn test were applied for the analysis of biofilm formation. To compare the mean intensity for the type of bacteria and the type of prosthesis, a general linear model was applied. Staphylococcus aureus was the bacterium with the highest colonization density in both prostheses (p = 0.0001). E. coli showed strong adherence in the biofilm formation capacity test (p = 0.0001), however, it did not colonize either prosthesis. We demonstrated that Staphylococcus aureus has a greater affinity for vascular and silicone prostheses than other bacteria.
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Maat, Bartjan, Gerwin Smit, Dick Plettenburg, and Paul Breedveld. "Passive prosthetic hands and tools: A literature review." Prosthetics and Orthotics International 42, no. 1 (March 1, 2017): 66–74. http://dx.doi.org/10.1177/0309364617691622.
Full textAbstract:
Background: The group of passive prostheses consists of prosthetic hands and prosthetic tools. These can either be static or adjustable. Limited research and development on passive prostheses has been performed although many people use these prosthesis types. Although some publications describe passive prostheses, no recent review of the peer-reviewed literature on passive prostheses is available. Objective: Review the peer-reviewed literature on passive prostheses for replacement of the hand. Study design: Literature review. Methods: Four electronic databases were searched using a Boolean combination of relevant keywords. English-language articles relevant to the objective were selected. Results: In all, 38 papers were included in the review. Publications on passive prosthetic hands describe their users, usage, functionality, and problems in activities of daily living. Publications on prosthetic tools mostly focus on sport, recreation, and vehicle driving. Conclusion: Passive hand prostheses receive little attention in prosthetic research and literature. Yet one out of three people with a limb deficiency uses this type of prosthesis. Literature indicates that passive prostheses can be improved on pulling and grasping functions. In the literature, ambiguous names are used for different types of passive prostheses. This causes confusion. We present a new and clear classification of passive prostheses. Clinical relevance This review provides information on the users of passive prosthetic hands and tools, their usage and the functionality. Passive prostheses receive very little attention and low appreciation in literature. Passive prosthetic hands and tools show to be useful to many unilateral amputees and should receive more attention and higher acceptance.
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Park, Gang-Seok, Seong-Kyun Kim, Seong-Joo Heo, Jai-Young Koak, and Deog-Gyu Seo. "Effects of Printing Parameters on the Fit of Implant-Supported 3D Printing Resin Prosthetics." Materials 12, no. 16 (August 9, 2019): 2533. http://dx.doi.org/10.3390/ma12162533.
Full textAbstract:
The purpose of the study was to investigate the influence of 3D printing parameters on fit and internal gap of 3D printed resin dental prosthesis. The dental model was simulated and fabricated for three-unit prostheses with two implants. One hundred prostheses were 3D printed with two-layer thicknesses for five build orientations using a resin (NextDent C&B; 3D systems, Soesterberg, The Netherlands) and ten prostheses were manufactured with a milling resin as control. The prostheses were seated and scanned with micro-CT (computerized tomography). Internal gap volume (IGV) was calculated from 3D reconstructed micro-CT data. IGV, marginal fit, and lengths of internal gaps were measured, and the values were analyzed statistically. For the 3D printed prostheses, IGV was smaller at 45°, 60°, and 90° compared to other build orientations. The marginal fit evaluated by absolute marginal discrepancy was smaller than other build orientations at 45° and 60°. IGV was smaller at 50 µm layer thickness than at 100 µm layer thickness, but the marginal fit was smaller at 100 µm layer thickness than at 50 µm layer thickness. The 3D printed prosthesis had smaller internal gap than the milled prosthesis. The marginal fit of the 3D printed resin prosthesis was clinically acceptable, and build orientation of 45° and 60° would be recommended when considering fit and internal gap.
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Crone, Norma. "A Comparison of Myo-Electric and Standard Prostheses — A Case Study of a Pre-School Aged Congenital Amputee." Canadian Journal of Occupational Therapy 53, no. 4 (October 1986): 217–22. http://dx.doi.org/10.1177/000841748605300407.
Full textAbstract:
The major advantages of early fitting with a standard prosthesis, are related to future acceptance, skilled use, and functional use of the prosthesis. Increasingly more parents of juvenile amputees are requesting myo-electric prostheses for their children. This study explored the areas of acceptance and adjustment, skill level, and functional use of a myo-electric prosthesis compared to a standard prosthesis with a child selected from the Juvenile Amputee Clinic list at the Alberta Children's Hospital in Calgary, Alberta, Acceptance and adjustment were measured by the Prosthetic Adjustment Scale and by parent interviews: Skill level and functional use of the prostheses were measured by simple instruments devised by the writer. Differences in skill level, acceptance, and functional use between the standard and the myo-electric prostheses were outlined and discussed. This study lends support to the idea of early myo-electric fitting.
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DOPPEN, P., M. SOLOMONS, and S. KRITZINGER. "Osseointegrated Finger Prostheses." Journal of Hand Surgery (European Volume) 34, no. 1 (December 17, 2008): 29–34. http://dx.doi.org/10.1177/1753193408093807.
Full textAbstract:
Amputation of a digit can lead to functional and psychological problems and patients can benefit from digital prostheses. Unfortunately, standard prostheses are often unstable, particularly when fitted over short amputation stumps. Prosthesis fixation by osseointegration is widely used in oral and extraoral applications and may help avoid the problem of instability. This paper reports the results of four patients with five finger amputations who were treated with osseointegrated implants to attach finger prostheses. One implant failed to osseointegrate and the procedure was abandoned. Three patients were successfully treated to completion of three finger prostheses and are extremely satisfied with their outcomes, both cosmetically and functionally, with osseoperception reported by all three patients.
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Kijkusol, D. "Simplified, low cost below-knee prosthesis." Prosthetics and Orthotics International 10, no. 2 (August 1986): 96–98. http://dx.doi.org/10.3109/03093648609164507.
Full textAbstract:
Problems are encountered in using standard prostheses in developing countries, especially when the prostheses need repair and the amputees cannot come back to the workshop. Very simple, low cost and durable prostheses can solve this problem. The solution described has worked well with villagers in some rural areas of Thailand, where the inexpensive prosthesis permits walking bare-foot and through water and mud.
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Leow, Eng-Lye, Anam-Kueh Kour, Barry P. Pereira, and Robert W. H. Pho. "COLOUR-MATCHING IN HAND AND FINGER PROSTHESES: THE ASIAN PERSPECTIVE." Hand Surgery 01, no. 01 (January 1996): 37–43. http://dx.doi.org/10.1142/s0218810496000099.
Full textAbstract:
The wide range of skin tones in the Asian population presents a challenge when colour-matching hand and finger prostheses. It requires that the prostheses be custom-made to better match the wide variations. We have developed a finger and hand prosthesis using a multi-layered moulding technique incorporating a colour-matching procedure capable of reproducing the colour tones and life-like appearance of the skin. Between 1990–1994, we have fitted these prostheses to a total of 109 patients. In evaluating the colour-match of their prostheses, 84% of the patients fitted with hand prostheses and 78% of those fitted with finger prostheses had a good to excellent match. This paper discusses some of the challenges we face in colour-matching hand and finger prostheses in the Asian population.
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Shin, Kristina, Kaoru Leung, Fred Han, and Jiao Jiao. "Thermal and moisture control performance of different mastectomy bras and external breast prostheses." Textile Research Journal 90, no. 7-8 (October 22, 2019): 824–37. http://dx.doi.org/10.1177/0040517519881815.
Full textAbstract:
This paper introduces a project involving a thermoregulation performance experiment design to evaluate the different responses of research subjects to a range of mastectomy bras and external breast prostheses. A set of newly designed heat-reduction mastectomy bras and prostheses were mix-matched with a set of conventional mastectomy bras and prostheses for the experiment. Four combinations of mastectomy bras and external breast prostheses were used: (a) Com A: conventional mastectomy bra and conventional prosthesis; (b) Com B: conventional mastectomy bra and heat-reduction prosthesis; (c) Com C: heat-reduction mastectomy bra and conventional prosthesis; and (d) Com D: heat-reduction mastectomy bra and heat-reduction prosthesis. Nine healthy male subjects (mean age: 31.9 ± 5.9 y and mean under-bust circumference: 35.3 ± 2.8 in) participated in this study in lieu of women who had undergone surgery for double mastectomy and were too self-conscious to expose their scars for sensor attachment. Eight sets of temperature and humidity sensors were placed between the surface of the skin and the prostheses and bra to measure the changes in both temperature and humidity data in a microclimate environment while the participants performed physical activity. The results showed that Com D demonstrated better thermal and moisture control, resulting in lower body temperature and lower humidity increment throughout the entire experiment. The study proved that the heat-reduction mastectomy bra and external breast prosthesis were effective in releasing the trapped heat and perspiration underneath the bra, and thus would provide a positive impact on clothing comfort and wearing experience for women who had undergone mastectomies.
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Fouly, Mohamed, and Tarek Khairy. "The performance of the supra-annular Top-Hat aortic valves compared to the standard Carbomedics valves." Egyptian Cardiothoracic Surgeon 4, no. 3 (May 1, 2022): 46–50. http://dx.doi.org/10.35810/ects.v4i3.226.
Full textAbstract:
Background: The CarboMedics Top-Hat aortic valve prosthesis was designed to be implanted in a supra-annular position. This study aimed to compare the hemodynamic performance of the Top-Hat aortic prostheses versus the standard CarboMedics aortic valve prostheses.
Methods: The study included 98 patients who had aortic valve replacement and were divided into two groups. Group A included 60 patients who had standard aortic valve prostheses, and Group B included 38 patients who had the Top-Hat aortic prostheses. The study endpoints were hospital outcomes, the effective orifice area, and the pressure gradient during a one-year follow-up.
Results: There was no significant difference in the baseline echocardiographic data and risk factors between the groups. The patients who had Top-Hat aortic prosthesis were younger, with a mean age of 47.5 (44-55) years, and those who had the standard prosthesis were 53.5 (48-56) years old (P= 0.02). The cardiopulmonary bypass time was significantly less in the Top-Hat prosthesis group with an average of 78 min (75- 81) compared to 88 min (84- 95) in the other group (P ˂0.001). The effective orifice surface area was significantly larger in the group with Top-Hat prosthesis; 0.9 mm/m2 (0.88- 0.92) compared to 0.84 mm/m 2 (0.79- 0.87) for the standard aortic valve prosthesis group (P ˂0.001). The pressure gradient over the aortic valve decreased significantly postoperatively (coefficient -1.98 (-2.21- -1.75); P˂0.001). Patients with Top-Hat valves had significantly lower gradient (coefficient: -4.22 (-6.61- -1.82); P= 0.001), while age had no effect on the pressure gradient (coefficient: 0.1 ( -0.07- 0.27); P= 0.25).
Conclusion: The Top-Hat CarboMedics prostheses could be superior to the standard CarboMedics aortic valve prosthesis regarding the effective orifice area and pressure gradient over the valve.
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Borisova, Eleonora, Nelli Mashkova, Aleksandr Spesivets, and Haidar Yagmurov. "RESULTS OF CLINICAL EVALUATION OF THE CONDITION OF REMOVABLE DENTURES FROM THERMOPLASTS." Actual problems in dentistry 18, no. 3 (November 23, 2022): 139–43. http://dx.doi.org/10.18481/2077-7566-2022-18-3-139-143.
Full textAbstract:
Subject. The results of a clinical examination of patients with complete and partial absence of teeth, who were made prostheses from thermoplastic material, as well as the adaptation of patients who comply and do not comply with the recommendations for hygienic care to prostheses for three months, are considered.
The aim is to assess the condition of thermoplastic prostheses and patient satisfaction with them after three weeks and three months of their use according to clinical examination data and using a subjective scaling test.
Methodology. Under observation were 43 patients with complete and partial absence of teeth, who were made prostheses from thermoplastic material "Belflex", produced by the Russian manufacturer "Vladmiva". A visual clinical assessment of the used prosthesis was carried out after three weeks and after 3 months in patients who fully complied with the doctor's hygienic recommendations for caring for prostheses, and for those who refused to comply with them.
Results. In the first group of patients who fully complied with the recommendations of an orthopedist, during a clinical examination, there were no violations of the integrity of the prostheses and discoloration both after 3 weeks and after 3 months. In the second group of patients, three months later, during a visual examination of the prosthesis, there were violations of the integrity, colors of the prosthesis base, numerous scratches on the surface, roughness, especially in the area of connection of artificial teeth with the prosthesis base. Changed parameters of the test of adaptation to orthopedic structures in all 20 patients.
Conclusions. The duration of their service life depends on the correct hygienic care of patients for removable orthopedic structures made of thermoplastics.
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Srimaneepong, Viritpon, Artak Heboyan, Azeem Ul Yaqin Syed, Hai Anh Trinh, Pokpong Amornvit, and Dinesh Rokaya. "Recent Advances in Myoelectric Control for Finger Prostheses for Multiple Finger Loss." Applied Sciences 11, no. 10 (May 14, 2021): 4464. http://dx.doi.org/10.3390/app11104464.
Full textAbstract:
The loss of one or multiple fingers can lead to psychological problems as well as functional impairment. Various options exist for replacement and restoration after hand or finger loss. Prosthetic hand or finger prostheses improve esthetic outcomes and the quality of life for patients. Myoelectrically controlled hand prostheses have been used to attempt to produce different movements. The available articles (original research articles and review articles) on myoelectrically controlled finger/hand prostheses from January 1922 to February 2021 in English were reviewed using MEDLINE/PubMed, Web of Science, and ScienceDirect resources. The articles were searched using the keywords “finger/hand loss”, “finger prosthesis”, “myoelectric control”, and “prostheses” and relevant articles were selected. Myoelectric or electromyography (EMG) signals are read by myoelectrodes and the signals are amplified, from which the muscle’s naturally generated electricity can be measured. The control of the myoelectric (prosthetic) hands or fingers is important for artificial hand or finger movement; however, the precise control of prosthetic hands or fingers remains a problem. Rehabilitation after multiple finger loss is challenging. Implants in finger prostheses after multiple finger loss offer better finger prosthesis retention. This article presents an overview of myoelectric control regarding finger prosthesis for patients with finger implants following multiple finger loss.
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Neto, Rui, António Costa-Ferreira, Nuno Leal, Margarida Machado, and Ana Reis. "An engineering-based approach for design and fabrication of a customized nasal prosthesis." Prosthetics and Orthotics International 39, no. 5 (June 4, 2014): 422–28. http://dx.doi.org/10.1177/0309364614535232.
Full textAbstract:
Background and aim: Facial defects (from neoplasms, trauma, etc.) can be functionally and emotionally devastating. A non-invasive treatment for these defects is the application of external prostheses. Conventionally, these prostheses are fabricated by an anaplastologist through a manual procedure, which is an expensive and time-consuming approach. Current advances in computational and engineering tools report an improvement in design and manufacturing of silicone prostheses. This demand motivated this study that aims to develop a methodology for fabricating customized nasal prostheses. Technique: In this study, an 80-year-old woman with a total defect of the nose is considered as case-study. The proposed methodology entails six tasks: (a) data acquisition, (b) three-dimensional reconstruction, (c) prosthesis design, (d) moulds fabrication, (e) prosthesis manufacturing and (f) final fittings. Discussion: The presented approach showed encouraging outcomes since it saves time, reduces costs and allows the achievement of prosthesis with the minimum contact and discomfort to the patient, disclosing excellent aesthetic and functional results. Clinical relevance Custom-made nasal prostheses with minimum contact and discomfort for the patient can be achieved using an engineering approach based on digital technologies and additive manufacturing that is cost-effective and less time-consuming than the manual procedure.
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Sjöberg, Lis, Helen Lindner, and Liselotte Hermansson. "Long-term results of early myoelectric prosthesis fittings: A prospective case-control study." Prosthetics and Orthotics International 42, no. 5 (September 14, 2017): 527–33. http://dx.doi.org/10.1177/0309364617729922.
Full textAbstract:
Background: Different recommendations exist regarding what age is best for first-time fitting of myoelectric hand prostheses in children. Objectives: To compare prosthetic skill, prosthetic use and risk for rejection over time between children fitted with myoelectric hand prostheses before or after 2½ years of age. Study design: Prospective case-control design. Methods: The cases were nine children fitted with myoelectric hand prostheses before the age of 2½ years, whereas the controls were 27 children who were fitted with myoelectric hand prostheses after the age of 2½ years. The Skills Index Ranking Scale was used to classify prosthetic skill, and prosthetic use was categorised based on wearing time and pattern. Independent samples tests were used to compare data between groups. To estimate and compare the risk of prosthesis rejection between groups and over time, survival analysis was used. Results: Cases showed prosthetic skill early, but controls had caught up by the age of 3½ years. Cases had a significant ( p = 0.046) decrease in prosthetic use at the age of 9 years. In the long term, cases had a higher percentage of prosthesis rejection. Conclusions: Considering young children’s development of prosthetic skill and prosthetic use over time, this study shows no additional advantages from fitting a myoelectric hand prosthesis before 2½ years of age. Clinical relevance Children may be fitted with myoelectric hand prostheses to assist in daily tasks and to prevent future over-use problems. Most children fitted with myoelectric hand prostheses before 4 years of age become regular users. No advantages of fitting myoelectric hand prostheses before 2½ years of age were observed.
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Kara, Recep. "Telescopic double crowns in prosthodontics." International Journal of Dental Research 8, no. 2 (July 24, 2021): 17. http://dx.doi.org/10.14419/ijdr.v8i2.31531.
Full textAbstract:
The purpose of this article is to classify the types of telescopic prostheses that protect natural teeth as an alternative to traditional removable prostheses, and to explain their advantages, disadvantages, indications and clinical significance in order to minimize the problems of removable dentures. Telescopic prostheses consist of an inner (primary) crown permanently cemented to an abutment and an outer (secondary) crown attached to the prosthesis. Primary crowns protect the abutment from bruises and thermal irritation, and also provide retention and stabilization of the secondary crown. The secondary crown combines the primary crown with the prosthesis to form a telescopic unit, providing prosthetic retention and stability.
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Jiří, Podlaha, and Schwanhaeuser Kräuff. "Experimental Assessment of a New Type of Vascular Prostheses with Adiponectin (Adipograft Ra 1Vk 7/350) on Sheep." Acta Veterinaria 64, no. 4 (December 1, 2014): 426–37. http://dx.doi.org/10.2478/acve-2014-0040.
Full textAbstract:
Abstract Despite medical advancements, the development of an ideal vascular prosthesis still poses a great challenge. In this study the researchers tried to test and verify the characteristics of a new type of vascular prosthesis, using adiponectin (Adipograft Ra 1vk 7/350) developed at the Knitting Research Institute, a.s. Brno. Two types of vascular prostheses (12 with adiponectin and 6 as a control without adiponectin) were implanted in nine healthy 4-year-old Merino sheep. The implantation site was the common carotid artery and the length of the implant was 10 cm. We applied the theory of the protected coagulum, whereby all sheep received antibiotics as a prophylactic measure. A Doppler U.S. was performed before finishing each operation, in order to verify the patency of the prostheses. Each animal was followed up during the whole study and the prostheses were extirpated on days 30 and 100 (1 and 3 months). It was observed that all prostheses coated with adiponectin showed patency after extirpation. The lumen implants were of a consistent thickness of 7 mm. Histological study of the implanted prostheses confirmed a quick, high quality, healing. Experimental vascular prostheses coated with adiponectin appeared to be successful in clinical practice. The researchers think that Adipograft Ra 1vk 7/350 can be a turning point in the development of vascular prostheses, due to its patency and quick healing.
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Leow, M. E. L., A. K. Kour, T. J. J. Inglis, G. Kumarasinghe, and R. W. H. Pho. "Fungal colonisation in digital silicone rubber prostheses." Prosthetics and Orthotics International 21, no. 3 (December 1997): 195–98. http://dx.doi.org/10.3109/03093649709164556.
Full textAbstract:
The fungal discolouration of silicone rubber prostheses is reported in four cases. In two of the cases, the discolouration was caused by the fungus Candida tropicalis. In the other two cases, two different fungal organisms, namely Trichoderma sp. and Scedosporium prolificans were incriminated. The non-porous silicone rubber layers create an enclosed environment in the suction cup of the prosthesis and preclude ventilation at the prosthesis-stump interface. The moisture as a result of sweat and body warmth in the stump assists fungal growth. Residual salts from the sweat, sebum from sebaceous glands and the residues from petroleum jelly (VaselineTM) applied to facilitate donning, can adhere to the surfaces of the prosthesis and provide the nutrients for fungal growth. Prolonged continuous usages of the prosthesis, the presence of sweaty palms in the users, donning the prosthesis during manual physical activities which induce perspiration, washing of hands with the prosthesis on and warm humid climatic conditions have been identified as factors predisposing the prosthesis to fungal colonisation. The fungal growth caused a black discolouration and marred the aesthetic quality of the prostheses. As a preventative measure, daily immersion of the prostheses in denture cleaner such as benzalkonium chloride, or water at 60°C for 15 minutes, or decontamination with 70% alcohol is recommended. Prior cleaning to remove organic matter before decontamination is emphasised.
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Jung, Seung Wook, Yi-Qin Fan, and Chunui Lee. "Digital Workflow for Edentulous Patients with Implant-Supported Fixed Prostheses: A Fully Digital Technique." Dentistry Journal 10, no. 9 (September 15, 2022): 174. http://dx.doi.org/10.3390/dj10090174.
Full textAbstract:
Dentists have made prostheses using traditional methods, which are inconvenient and time-consuming. It includes functional impression taking, plaster model production, wax rim production, intermaxillary relationship and occlusal plane setting, artificial tooth arrangement, denture polymerization, polishing, etc. To make prostheses in this way, the patient has to visit the dentist several times, and it takes a long time for them to receive treatment. In addition, the potential for errors associated with the denture-manufacturing process and the use of denture materials has always existed. However, the recent use of digital technology in dentistry has made it possible to create digital prostheses. Several techniques for the immediate loading of implants with a fixed prostheses in edentulous patients have been developed. However, these techniques are partially digital techniques that include laboratory work for prosthesis fabrication. This article aimed to describe a fully digital technique for implant-supported fixed prostheses. It includes intra-oral scanning of edentulous patients, implant placement planning, and final prosthesis fabrication. This technique facilitates a simple and more efficient immediate restoration after implant placement without using stone casts.
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Pustovaya, I. V., M. A. Engibaryan, P. V. Svetitskiy, I. V. Aedinova, V. L. Volkova, N. A. Chertova, Yu V. Ulianova, and M. V. Bauzhadze. "Orthopedic treatment in cancer patients with maxillofacial pathology." South Russian Journal of Cancer 2, no. 2 (June 20, 2021): 22–33. http://dx.doi.org/10.37748/2686-9039-2021-2-2-3.
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Relevance. Staged orthopedic treatment was used to improve the quality of life of patients who underwent radical maxillofacial surgeries for cancer.Patients and methods. 197 patients receiving treatment for maxillofacial cancer were observed at the Department of head and neck tumors, National Medical Research Centre for Oncology of the Ministry of Health of Russia, in 1998- 2018. All patients underwent radical surgical treatment resulting in postoperative defects of the upper jaw, soft tissues of the zygomatic- buccal-orbital region, nose, or auricle.Results. Removable obturator prostheses with various supporting and retaining elements were made for 159 (80.7 %) patients. Individual facial prostheses were made for 38 (19.3 %) patients: 17 (44.7 %) – external orbital prostheses, 14 (36.8 %) – external nasal prostheses, 6 (15.8 %) – external zygomatic- buccal-orbital prostheses, 1 (2.7 %) – external auricle prosthesis. Combined prostheses were made for 4 patients– removable upper jaw obturator and nose prosthe[1]sis; removable upper jaw obturator and eye prosthesis. Combined prostheses were fixed to each other using magnets. The results of maxillofacial prosthetics were evaluated according to the aesthetic requirements of the patients and their quality of life. Maxillofacial prostheses allowed a complete restoration of chewing, swallowing, and speaking, restored facial deformation, and improved the appearance of patients.Conclusions. Timely and comprehensive orthopedic treatment of patients with postoperative maxillofacial defects after radical surgeries for malignant tumors takes the main place in the complex of rehabilitation measures. Early elimination of extensive defects is aimed at maximum restoration of oral dysfunctions and appearance preservation. The apparent advantages of maxillofacial prostheses involve improvement of social adaptation and the quality of life of patients, which promotes complete rehabilitation and a return to socially useful activities.
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Podlaha, Jiří, Martin Dvořák, Věra Žižková, Rudolf Dvořák, Radovan Kabeš, Miroslav Jelínek, and Karel Veselý. "Experimental Assessment of a New Type of Carbon-Coated ARTECOR® Vascular Prosthesis in Sheep." Acta Veterinaria Brno 78, no. 1 (2009): 115–20. http://dx.doi.org/10.2754/avb200978010115.
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The aim of the study was to test and verify the characteristics of a new type of carbon-coated ARTECOR® vascular prosthesis developed at the Knitting Research Institute, a.s. Brno. Eight healthy Merino sheep, aged between 2 and 3 years, were implanted four types (A, B, C with diamond-like carbon (DLC) coating and D as a control without DLC) of vascular prostheses. The site of implantation was the common carotid artery; the length of the implant was 7 cm. All sheep received antibiotics prophylactically in accordance with the theory of the so-called “protected coagulum”. Doppler ultrasound examination was performed before finishing the operation to verify the patency of each prosthesis. During the study period the animals were closely observed. Prostheses were extirpated on day +/- 100 in 6 sheep and on day 182 in 2 sheep. Type B prosthesis showed better results according to its postoperative patency. The implant lumen was constantly 7 mm, whereas the use of other types resulted in lumen narrowing. Type B prosthesis has a deposition of DLC coating of a thickness of 20 nm with a high content of sp3 bonds (more diamond-like ones). The experimental type B of prosthesis ARTECOR® appears to be the most successful of the tested prostheses (at the end of the study all B-type prostheses remained patent). This prosthesis appears to better satisfy the rheologic characteristics for healing.
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KANDA, Akimitsu, Jiro KAWAMURA, Kazuyoshi NISHIHARA, and Kenji KOYAMA. "SIMULATED PROSTHESIS FOR EVALUATING NEW PROSTHESES." Biomechanisms 10 (1990): 239–46. http://dx.doi.org/10.3951/biomechanisms.10.239.
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Fraser, C. M. "An evaluation of the use made of cosmetic and functional prostheses by unilateral upper limb amputees." Prosthetics and Orthotics International 22, no. 3 (December 1998): 216–23. http://dx.doi.org/10.3109/03093649809164486.
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There is currenty a distinction drawn between a prosthesis considered to be provided for purely cosmetic reasons and a functional prosthesis provided to enable the amputee to achieve basic hand function. Using video analysis the study reported in this paper demonstrates that for non-manipulative actions cosmetic prostheses are actively used in the performance of everyday tasks as frequently evidence for a cosmetic prosthesis to be presented to an amputee as a realistic initial prosthesis and not as the option of last resort if a functional prosthesis is rejected. It is also recommended that training is provided in the use of cosmetic prostheses in two-handed tasks.
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Gilg, Magdalena M., Christine Wibmer, Marko Bergovec, Robert J. Grimer, and Andreas Leithner. "When Do Orthopaedic Oncologists Consider the Implantation of Expandable Prostheses in Bone Sarcoma Patients?" Sarcoma 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/3504075.
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Introduction. Indications discussed for the implantation of expandable prostheses in bone sarcoma patients are unclear. This survey aimed to analyse common practice with this implant type in orthopaedic oncology. Methods. A web-based survey was sent to 98 orthopaedic oncology surgeons. Factors reported in literature to influence the decision on the implantation of a growing prosthesis were covered in individual questions and three case scenarios. Results. The completion rate of the survey was 45% (n = 44). Twenty-seven of 44 surgeons (61%) had implanted between 1 and 15 expandable prostheses within three years. The minimum median patient age was 6.5 years, and 3–5 cm of predicted growth deficit was the minimum before implanting a growing prosthesis. One-third of surgeons do not use growth calculation methods. Two out of three surgeons would rather not implant a growing prosthesis in children with metastatic disease. Conclusions. Our survey confirmed the literature with 3-4 cm as the minimum estimated growth deficit. The minimum age for the implantation of a growing prosthesis is approx. 6.6 years, and therefore the patients are younger than those reported in previous publications. One-quarter of orthopaedic surgeons do not use growing prostheses at all. It remains unclear whether growing prostheses are indicated in patients with metastatic disease.
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Dieval, Florence, Foued Khoffi, Riaz Mir, Walid Chaouch, Didier Le Nouen, Nabil Chakfe, and Bernard Durand. "Long-Term Biostability of Pet Vascular Prostheses." International Journal of Polymer Science 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/646578.
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PET Vascular prostheses are susceptible to physical modification and chemical degradation leading sometimes to global deterioration and rupture of the product. To understand the mechanisms of degradation, we studied 6 vascular prostheses that were explanted due to medical complications. We characterized their level of degradation by comparing them with a virgin prosthesis and carried out physicochemical and mechanical analyses. Results showed an important reduction of the fabric’s mechanical properties in specific areas. Moreover, PET taken from these areas exhibited structural anomalies and was highly degraded even in virgin prostheses. These results suggest that vascular prostheses have weak areas prior to implantation and that these areas are much more prone to in vivo degradation by human metabolism. Manufacturing process could be responsible for these weaknesses as well as designing of the compound. Therefore, we suggest that a more controlled manufacturing process could lead to a vascular prosthesis with enhanced lifespan.
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Kytö, Ville, Elina Ahtela, Jussi Sipilä, Päivi Rautava, and Jarmo Gunn. "Mechanical versus biological valve prosthesis for surgical aortic valve replacement in patients with infective endocarditis." Interactive CardioVascular and Thoracic Surgery 29, no. 3 (May 23, 2019): 386–92. http://dx.doi.org/10.1093/icvts/ivz122.
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Abstract OBJECTIVES The optimal choice of valve prosthesis in surgical aortic valve replacement for infective endocarditis (IE) is controversial. We studied outcomes after mechanical versus biological prosthetic valve surgical aortic valve replacement in IE patients. METHODS All patients with native-valve IE aged 16–70 years undergoing mechanical or biological surgical aortic valve replacement in Finland, between 2004 and 2014, were retrospectively studied (n = 213). Outcomes were all-cause mortality, ischaemic stroke, major bleeding and aortic valve reoperation at 1 year and 5 years. Results were adjusted for baseline features (age, sex, comorbidity burden, atrial fibrillation, valvular stenosis, concomitant coronary artery bypass grafting, extension, urgency, year and centre of operation). Median follow-up was 5 years. RESULTS The 5-year mortality rate was 19.0% with mechanical prostheses and 34.8% with biological prostheses [hazard ratio (HR) 0.47, 95% confidence interval (CI) 0.23–0.92; P = 0.03]. Ischaemic stroke rates were 8.3% with mechanical prostheses and 16.8% with biological prostheses at 5 years (HR 0.21, CI 0.06–0.79; P = 0.01). Results were comparable in patients aged 16–59 and 60–70 years (interaction P = 0.84). Major bleeding within 5 years was similar between mechanical (11.3%) and biological valve (13.4%) groups (P = 0.95) with comparable rates of both gastrointestinal and intracranial bleeds. Reoperation rates at 5 years were 5.0% for mechanical prostheses and 9.2% for biological prostheses (P = 0.14). The 1-year ischaemic stroke rate was lower with mechanical prostheses (3.6% vs 11.6%, P =0.03), whereas mortality, major bleeding and reoperation rates were similar between groups. CONCLUSIONS The use of mechanical aortic valve is associated with lower mid-term mortality compared to biological prosthesis in patients with native-valve IE aged ≤70 years. Our results do not support the routine choice of a biological aortic valve prosthesis in this patient group.