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1.
Arq. bras. med. vet. zootec. (Online) ; 73(3): 711-720, May-June 2021. tab, graf
Article in English | ID: biblio-1278355

ABSTRACT

This study aimed to evaluate the productive performance, dry matter intake, apparent digestibility and ingestive behavior of feedlot calves fed corn silage from the feed out face of trench silos with different types of sealing. The animals were divided into three treatments with four repetitions: Conventional seal - double-sided polyethylene of 110µm thickness; Double-sided seal - double-sided polyethylene of 200µm thickness; and Double seal - composed of double face polyethylene with a thickness of 80µm superimposed on a polyamide translucent vacuum film with a thickness of 20µm. The use of double face sealing provided 12.63% increase in average daily gain and improved food conversion by 0.62 percentage points. The apparent digestibility of the diet with double-face sealing system silage was 4.30% higher than the diet with double-face sealing silage and 11.00% higher than the diet with conventional sealing silage. It is recommended to use the double face sealing with 200µm polyethylene and double face sealing with 80µm thick polyethylene on top of a 20µm thick polyamide translucent vacuum film.(AU)


Objetivou-se avaliar o desempenho produtivo, o consumo de matéria seca, a digestibilidade aparente e o comportamento ingestivo de novilhos confinados, alimentados com silagem de milho da porção inicial de silos do tipo trincheira, conservada sob distintos tipos de vedação. Os animais foram divididos em três tratamentos, com quatro repetições: vedação convencional - polietileno tipo dupla face, com espessura de 110µm; vedação dupla face - polietileno tipo dupla face, com espessura de 200µm; e dupla vedação - polietileno tipo dupla face, com espessura de 80µm sobreposto a um filme vácuo translúcido de poliamida, com espessura de 20µm. O uso da vedação dupla face proporcionou incremento de 12,63% no ganho de peso médio diário e melhorou em 0,62 ponto percentual a conversão alimentar. A digestibilidade aparente da dieta com silagem do sistema de vedação dupla face foi 4,30% superior em relação à dieta com silagem da dupla vedação e 11,00% superior à dieta com silagem da vedação convencional. Recomenda-se a utilização tanto da vedação dupla face com polietileno de 200µm quanto da dupla vedação com polietileno tipo dupla face, com espessura de 80µm, sobreposto a um filme vácuo translúcido de poliamida com espessura de 20µm.(AU)


Subject(s)
Animals , Male , Cattle , Silage/analysis , Weight Gain , Polyethylene , Eating , Food Storage/methods , Food Packaging/methods
2.
Ciencia Tecnología y Salud ; 8(2): 260-268, 2021. il 27 c
Article in Spanish | LILACS-Express | LILACS, LIGCSA, DIGIUSAC | ID: biblio-1353264

ABSTRACT

La contaminación por microplásticos (MPs) de tamaño menor a 5 mm ha tomado relevancia en los últimos años debido a su impacto en los ecosistemas. En Guatemala, se carece de información relacionada con MPs, por lo que este estudio tuvo como objetivo evaluar la abundancia y características de MPs en cuatro playas del Pacífico de Guatemala, Ocós, Tulate, Sipacate y Las Lisas. Se colectaron muestras de arena en mayo y octubre de 2019. Los MPs se aislaron y se clasificaron por forma, y el tipo de polímero se identificó a través de un equipo de espectroscopia infrarroja con transformada de Fourier (ATR-FTIR). La abundancia expresada en MPs/m2 en mayo fue de 25.6, 5.6, 0.8 y 0 MPs/m2 para Tulate, Las Lisas, Ocós y Sipacate; mientras que en octubre fue de 59.6, 23.2, 17.6 y 17.6 MPs/m2 en Tulate, Ocós, Las Lisas y Sipacate. Fragmentos, foam, pellets y láminas fueron las formas predominantes de MPs que se encontraron en las playas. El análisis por ATR-FTIR muestra que los principales polímeros identificados en las playas son polietileno, poliestireno y polipropileno. Los resultados de este estudio indican que las playas del Pacífico de Guatemala están contaminadas por MPs de diferentes tipos de polímeros. Además, estos resultados ofrecen información importante a los responsables de la toma de decisiones sobre la eliminación y el manejo de la basura plástica marina.


Microplastics < 5 mm (MPs) pollution has gained relevance in the last years because of its impact on the ecosystems. In Guatemala, information related to MPS as an environmental stressor is lacking, that is why this study aimed to assess the abundance and characteristics of MPS in four beaches to the Pacific Ocean of Guatemala, Ocós, Tulate, Sipacate, and Las Lisas. Sand samples were collected in May and October 2019. MPs were isolated and classified by shape and the type of polymer was identified by using Attenuated Total Reflec-tion-Fourier Transform Infrared Spectroscopy (ATR-FTIR). The abundance expressed in MPs/m2 in May was 25.6, 5.6, 0.8 and 0 MPs/m2 in Tulate, Las Lisas, Ocós, and Sipacate; whereas in October was 59.6, 23.2, 17.6, and 17.6 M Ps /m2 in Tulate, Las Lisas, Ocós and Sipacate. Fragments, foam, pellets, and film were the predominant shapes found on the beaches. The ATR-FTIR analysis indicates that the main polymers identified in the beaches are polyethylene, polystyrene, and polypropylene. The results of this study indicate that the Pacific Beaches of Guatemala are contaminated by MPs of different types of polymers. These results offer important information to decision makers about disposal and management of marine plastic litter.


Subject(s)
Bathing Beaches , Environmental Pollution/analysis , Microplastics/analysis , Polypropylenes/analysis , Polystyrenes/analysis , Pacific Ocean , Polyethylene/analysis , Microplastics/adverse effects , Guatemala
3.
Rev. bras. ortop ; 55(5): 597-604, Sept.-Oct. 2020. tab, graf
Article in English | LILACS | ID: biblio-1144213

ABSTRACT

Abstract Objective This study aims to compare the in vitro wear rate of crosslinked, high molecular weight polyethylene coupled to 36-mm diameter ceramic heads and 32-mm diameter metal heads. Methods Ceramic-on-polyethylene (36 mm) and metal-on-polyethylene (32 mm) tribological pairs were submitted to biomechanical tests in a simulator to determine the wear rate after 15 × 106 cycles. Results A statistically significant difference (p= 0.0005) was detected when comparing the wear rate of assemblies with metallic heads (average wear: 14.12 mg/MC) and ceramic heads (average wear: 7.46 mg/MC). Conclusion The present study demonstrated the lower wear rate in prosthetic assemblies using 36-mm crosslinked ceramic-on-polyethylene tribological pairs compared to 32-mm crosslinked metal-on-polyethylene assemblies. This finding demonstrates the effectiveness of ceramic-on-polyethylene tribological pairs, even with large diameter heads.


Resumo Objetivo: O objetivo do presente estudo foi comparar, in vitro, a taxa de desgaste do polietileno de alto peso molecular reticulado acoplado a cabeças cerâmicas de 36 mm de diâmetro e acoplado a cabeças metálicas de 32 mm de diâmetro. Métodos: Foram realizados ensaios biomecânicos em simulador de desgaste para os pares tribológicos cerâmica-poli (36 mm) e metal-poli (32 mm) a fim de verificar a taxa de desgaste após em 15 × 106 ciclos. Resultados: Na comparação entre as medidas de taxa de desgaste dos conjuntos com cabeças metálicas (média:14,12 mg/MC) e cerâmicas (média:7,46 mg/MC) houve diferença estatitsticamente significativa (p= 0,0005). Conclusão: O presente estudo demonstrou menor taxa de desgaste em conjuntos protéticos que utilizaram o par tribológico cerâmica-polietileno reticulado de 36 mm em comparação aos conjuntos com metal-polietileno reticulado de 32 mm. Tal achado demonstra a eficácia do par tribológico cerâmica-poli, mesmo com a utilização de cabeças de grande diâmetro.


Subject(s)
Prosthesis Design , Weights and Measures , In Vitro Techniques , Ceramics , Arthroplasty, Replacement, Hip , Polyethylene , Hip
5.
Article in English | WPRIM | ID: wpr-785314

ABSTRACT

BACKGROUND: Because of its efficacy and safety, polyethylene glycol (PEG) is generally used to prepare for colonoscopy. However, the side effects of PEG, including nausea, vomiting, abdominal discomfort, pain, and general weakness, tend to decrease patient compliance and satisfaction. The aim of this study is to investigate the efficacy and safety of PEG with 0.1 mg ramosetron on colonoscopy patients who had difficulty taking PEG due to side effects or large volume.METHODS: From January to August in 2012, 28 patients who visited Yeungnam University hospital for a colonoscopy were prospectively enrolled. All enrolled patients were previous history underwent colonoscopy using PEG only in our hospital. The efficacy and safety of ramosetron were assessed through the use of a questionnaire, and compared previous bowel preparation.RESULTS: Compared to previous examination, the patients using the ramosetron reported less nausea, vomiting, abdominal discomfort, and abdominal pain, as well as a higher degree of compliance and satisfaction of the patient. There were no side effects reported with the use of ramosetron. However, overall bowel preparation quality was not better than the previous examination.CONCLUSION: In case of the use of ramosetron in combination with PEG for bowel preparation, patients experienced a higher rate of compliance and tolerance. Looking forward, ramosetron may become an option of pretreatment for bowel preparation.


Subject(s)
Abdominal Pain , Colonoscopy , Compliance , Humans , Nausea , Patient Compliance , Polyethylene Glycols , Polyethylene , Prospective Studies , Vomiting
6.
Article in English | WPRIM | ID: wpr-763590

ABSTRACT

BACKGROUND: The isolated liner and head exchange procedure has been an established treatment method for polyethylene wear and osteolysis when the acetabular component remains well fixed. In this study, the mid-term results of this procedure were evaluated retrospectively. METHODS: Among the consecutive patients operated on from September 1995, two patients (three hips) were excluded because of inadequate follow-up, and the results of remaining 34 patients (34 hips) were evaluated. There were 20 men and 14 women with a mean age of 49 years. A conventional polyethylene liner was used in 26 cases and a highly cross-linked polyethylene liner was used in eight cases. In three cases, the liner was cemented in a metal shell because a compatible liner could not be used. RESULTS: After a follow-up of 5 to 20.2 years, re-revision surgery was necessary in 10 cases (29.4%): in eight for wear and osteolysis at 55 to 101 months after liner exchange and in two for acetabular loosening at 1 and 1.5 years after liner exchange. Re-revision surgery included all component revision (four cases), cup revision (four cases), and liner exchange (two cases). In all re-revision cases, a conventional polyethylene liner was used initially. There was no failure in the cases in which a highly cross-linked polyethylene liner was used. CONCLUSIONS: The results of this study suggest that isolated acetabular liner exchange is a reasonable option for wear and osteolysis when the metal shell is well fixed. More promising long-term results are expected with the use of highly cross-linked polyethylene liners.


Subject(s)
Acetabulum , Bone Screws , Female , Follow-Up Studies , Fracture Fixation , Head , Humans , Humerus , Male , Methods , Osteolysis , Polyethylene , Retrospective Studies
7.
Article in English | WPRIM | ID: wpr-762866

ABSTRACT

BACKGROUND: The endoscopic transnasal approach is widely used for reconstructing the medial orbital wall by filling it with a silicone sheet or Merocel, but this technique has the disadvantage of retaining the packing for a long time. To overcome this drawback, a method of positioning an absorbable plate in the orbit has been introduced, but there is a risk of defect recurrence after the plate is absorbed. Here, the authors report the results of a novel surgical technique of placing a nonabsorbable titanium mesh with porous polyethylene into the orbit through the endoscopic transnasal approach. METHODS: Fourteen patients underwent surgery using the endoscopic transnasal approach. Preoperative computed tomography (CT) was used to calculate the size of the bone defect due to the fracture, and the titanium mesh was designed to be shorter than the anteroposterior length of the defect and longer than its height. The titanium mesh was inserted into the orbit under an endoscopic view. The authors then confirmed that the titanium mesh supported the orbital contents by pressing the eyeball and finished the operation. Immediately after surgery, CT results were evaluated. RESULTS: Postoperative CT scans confirmed that the titanium mesh was well-inserted and in the correct position. All patients were discharged without any complications. CONCLUSIONS: We obtained satisfactory results by inserting a titanium mesh with porous polyethylene into the orbit via the transnasal approach endoscopically.


Subject(s)
Endoscopy , Humans , Methods , Orbit , Polyethylene , Recurrence , Silicon , Silicones , Titanium , Tomography, X-Ray Computed
8.
Article in English | WPRIM | ID: wpr-762770

ABSTRACT

BACKGROUND: The conventional surgical method for reconstructing orbital floor fractures involves restoration of orbital continuity by covering an onlay with a thin material under the periorbital region. However, in large orbital floor fractures, the implant after inserting is often dislocated, leading to malposition. This study aimed to propose a novel implanting method and compare it with existing methods. METHODS: Among patients who underwent surgery for large orbital floor fractures, 24 who underwent the conventional onlay implanting method were compared with 21 who underwent the novel γ implanting method that two implant sheets were stacked and bent to resemble the shape of the Greek alphabet γ. When inserting a γ-shaped implant, the posterior ledge of the orbital floor was placed between the two sheets and the bottom sheet was impacted onto the posterior wall of the maxilla to play a fixative role while the top sheet was placed above the residual orbital floor to support orbital contents. Wilcoxon signed-rank test and Mann-Whitney U test were used for data analyses. RESULTS: Compared to the conventional onlay method, the gamma method resulted in better restoration of orbital contents, better improvement of enophthalmos, and fewer revision surgeries. CONCLUSION: Achieving good surgical outcomes for extended orbital floor fractures is known to be difficult. However, better surgical outcomes could be obtained by using the novel implantation method of impacting a γ-shaped porous polyethylene posteriorly.


Subject(s)
Enophthalmos , Humans , Inlays , Maxilla , Methods , Orbit , Orbital Fractures , Orbital Implants , Polyethylene , Statistics as Topic
9.
Biosci. j. (Online) ; 34(5): 1392-1401, sept./oct. 2018.
Article in English | LILACS | ID: biblio-967333

ABSTRACT

The objective of this study was to identify the scientific evidences regarding biofilm formation prevention on hip prosthesis biomaterials. It's an integrative review that aims to answer the following question: what are the scientific evidences regarding biofilm formation prevention on hip prosthesis biomaterials? The search was performed on PubMed portal and on databases: Web of Science, Embase, Cochrane, CINAHL and LILACS. Primary studies about the topic published online up until November 2017 in English, Spanish and Portuguese are included. Among 16 primary studies, 81.25% were in vitro experimental studies, in which polyethylene showed a higher biofilm formation than metallic biomaterials and polymethylmethacrylate. Among clinical studies, Staphylococcus epidermidis and Staphylococcus aureus were isolated in most of joint prosthesis components. New acylase-containing polyurethane coatings, silver-zirconium carbonitride films, bioactive gentamicin, biodegradable gentamicin-hydroxyapatite, vancomycin, titanium-silicon-carbonoxygen-nitrogen films and cross-linked polyethylene combined with vitamin E and a poly(2-methacryloyloxyethyl phosphorylcholine) layer were developed to prevent biofilm formation. Moreover, cobalt-chromium (Co-Cr) ions inhibited bacterial growth, and cobalt-chromium particles reduced biofilm development. The biomaterials that presented properties against biofilm formation were: bioactive gentamicin, biodegradable gentamicin-hydroxyapatite, vancomycin, acylasecontaining polyurethane, cross-linked polyethylene combined with vitamin E-blended and a poly(2-methacryloyloxyethyl phosphorylcholine) layer, silver-zirconium carbonitride films and titanium-silicon-carbon-oxygen-nitrogen films. Moreover, the Co-Cr particles released from metallic joint prosthesis showed higher antibiofilm activity than Co-Cr ions.


O objetivo deste estudo foi identificar as evidências científicas a respeito da prevenção da formação de biofilme em biomateriais de próteses de quadril. Revisão integrativa da literatura, com vistas a responder a seguinte questão: quais são as evidências científicas a respeito da prevenção da formação de biofilme em biomateriais de próteses de quadril? Realizado no portal PubMed da National Library of Medicine e nas bases: Web of Science, Embase, Cochrane, CINAHL e LILACS. Incluíram-se estudos primários sobre a temática, publicados online até novembro de 2017 em inglês, espanhol e português. Dos 16 estudos primários analisados, 81,25% foram pesquisas experimentais in vitro; polietileno demonstrou maior contagem de unidades formadoras de colônia do que materiais metálicos e polimetilmetacrilato. Dos estudos clínicos, Staphylococcus epidermidis e Staphylococcus aureus foram isolados na maioria dos componentes das próteses articulares. Novos revestimentos constituídos de poliuretano contendo acilase, filmes de prata-carbonitreto de zircônio, gentamicina bioativa, gentamicina-hidroxiapatita biodegradável, vancomicina, filmes de titânio-silício-carbonooxigênio-nitrogênio e polietileno reticulado combinado com vitamina E e uma camada de poli (2-metacriloiloxietil fosforilcolina) foram desenvolvidos para prevenção da formação de biofilme. Além disso, íons de cobalto-cromo (Co-Cr) inibiram o crescimento bacteriano, e houve uma tendência das partículas de cobalto-cromo diminuírem o desenvolvimento de biofilmes. Os biomateriais que apresentaram propriedades que previnem a formação de biofilme foram: gentamicina bioativa, gentamicina-hidroxiapatita biodegradável, vancomicina, poliuretano contendo acilase, polietileno reticulado combinado com vitamina E e uma camada de poli (2-metacriloiloxietil fosforilcolina), filmes de prata-carbonitreto de zircônio e filmes de titânio-silício-carbono-oxigênio-nitrogênio. Além disso, partículas de Co-Cr liberadas das próteses articulares metálicas mostraram maior atividade antibiofilme que íons de Co-Cr.


Subject(s)
Biocompatible Materials , Biofilms , Arthroplasty, Replacement, Hip , Hip Prosthesis , Staphylococcus aureus , Staphylococcus epidermidis , Polyethylene
10.
Int. braz. j. urol ; 44(3): 591-599, May-June 2018. tab, graf
Article in English | LILACS | ID: biblio-954040

ABSTRACT

ABSTRACT Objective To assess the role of high-barrier plastic wrap in reducing the number and size of polyps, as well as decreasing the inflammation and allergic reactions in exstro- phy cases, and to compare the results with the application of low-barrier wrap. Materials and Methods Eight patients with bladder exstrophy-epispadias complex (BEEC) that had used a low density polyethylene (LDPE) wrap for coverage of the exposed polypoid bladder in preoperative care management were referred. The main complaint of their parents was increase in size and number of polyps. After a period of 2 months using the same wrap and observing the increasing pattern in size of polyps, these patients were recommended to use a high-barrier wrap which is made of polyvinylidene chloride (PVdC), until closure. Patients were monitored for the number and size of polyps before and after the change of barriers. The incidence of para-exstrophy skin infection/inflammation and skin allergy were assessed. Biopsies were taken from the polyps to identify histopathological characteristics of the exposed polyps. Results The high barrier wrap was applied for a mean ± SD duration of 12±2.1 months. Polyps' size and number decreased after 12 months. No allergic reaction was detected in patients after the usage of PVdC; three patients suffered from low-grade skin allergy when LDPE was applied. Also, pre-malignant changes were observed in none of the patients in histopathological examination after the application of PVdC. Conclusion Polyps' size and number and skin allergy may significantly decrease with the use of a high-barrier wrap. Certain PVdC wraps with more integrity and less evaporative permeability may be more "exstrophy-friendly".


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Polyps/therapy , Preoperative Care/methods , Bladder Exstrophy/surgery , Polyethylene/therapeutic use , Polyps/pathology , Reference Values , Skin Diseases/prevention & control , Time Factors , Biopsy , Preoperative Care/instrumentation , Reproducibility of Results , Bladder Exstrophy/pathology , Epispadias/surgery , Epispadias/pathology , Treatment Outcome , Hypersensitivity/prevention & control
11.
Article in English | WPRIM | ID: wpr-788731

ABSTRACT

OBJECTIVE: The purpose of this study was to compare the cosmetic outcome and complications after cranioplasty (CP) due to three different implant materials, and analyze the mean implant survival and cumulative survival rate based on these results.METHODS: We reviewed 108 patients retrospectively who underwent CP between January 2014 and November 2016. Autologous bone (AB; 45 patients) and synthetic materials with porous polyethylene (PP; 32 patients) and custom-made 3-dimensional printed titanium mesh (CT; 31 patients) were used as implants.RESULTS: Regardless of implanted materials, more than 89.8% of the CP patients were satisfied with the cosmetic outcome. No statistically significant difference was observed among the three groups. The overall postoperative complication rates of each group were 31.1% in the AB group, 15.6% in the PP group and 3.2% in the CT group. The CT group showed lower complication rates compared with AB and PP groups (χ2-test : AB vs. PP, p=0.34; AB vs. CT, p=0.00; PP vs. CT, p=0.03). The AB and PP groups demonstrated a higher post-CP infection rate (11.1% and 6.3%) than the CT group (3.2%). However, no significant difference in the incidence of post-CP infection was observed among the three groups. The PP and CT groups demonstrated a higher mean implant survival time and cumulative survival rate than the AB group at the last follow-up (p < 0.05).CONCLUSION: In comparison with AB and PP, cranioplasty with CT shows benefits in terms of lower post-CP complication, less intraoperative bleeding loss, shorter operation time and in-hospital stay. The PP and CT groups showed higher implant survival time and cumulative survival rate compared with the AB group.


Subject(s)
Bone Resorption , Follow-Up Studies , Hemorrhage , Humans , Incidence , Polyethylene , Postoperative Complications , Reconstructive Surgical Procedures , Retrospective Studies , Survival Rate , Titanium
12.
Article in Korean | WPRIM | ID: wpr-718973

ABSTRACT

PURPOSE: To evaluate the utility of ceramic-on-polyethylene articular bearing surface when cementless total hip arthroplasty is performed in patients older than 65 years through an analysis of the minimum five-year follow-up results using the ceramic femoral head and cross-linked polyethylene liner. MATERIALS AND METHODS: From March 2010 to September 2012, 51 patients (56 hips) who were older than 65 years were enrolled in this retrospective study. The mean age at surgery was 70.9±5.1 years old. A clinical assessment was analyzed using the Harris hip score. For the radiographic assessment, the cup inclination and anteversion, stem alignment, and wear amount were measured. The postoperative complications were also determined. RESULTS: The mean Harris hip score was improved from preoperative 48 points to postoperative 87 points (p < 0.05). The mean cup inclination was 40.9°±6.4° and the mean cup anteversion was 20.3°±8.1°. The mean cup anteversion of the elevated liner-used group (16 cases) was 14.3°±7.9° and the mean cup anteversion of the neutral liner used group (40 cases) was 22.4°±9.1° (p < 0.05). The mean stem alignment angle was 0° (range, varus 4°–valgus 4°). The mean linear wear amount was 0.458±0.041 mm and the average annual linear wear rate was 0.079±0.032 mm/yr. Six cases (10.7%) of intraoperative periprosthetic femoral fractures were encountered. CONCLUSION: Based on these results, the use of a ceramic-on-polyethylene articular bearing surface in elderly patients with cementless total hip arthroplasty is beneficial. On the other hand, careful effort is needed to prevent intraoperative periprosthetic femoral fractures.


Subject(s)
Aged , Arthroplasty, Replacement, Hip , Ceramics , Femoral Fractures , Follow-Up Studies , Hand , Head , Hip , Humans , Polyethylene , Postoperative Complications , Retrospective Studies
13.
Article in Korean | WPRIM | ID: wpr-718971

ABSTRACT

PURPOSE: Many reconstruction methods have been attempted after an en-bloc resection of the proximal humerus. In particular, the introduction of reverse shoulder arthroplasty (RSA) has made a breakthrough in the functional recovery of the shoulder. Nevertheless, RSA has limitations when the humeral bone stock loss is significant. In addition, it is unclear if RSA is effective in patients showing failure with non-operative treatment of a proximal humeral tumor. MATERIALS AND METHODS: A reconstruction was performed using an overlapping allograft-RSA composite for 11 patients with a failed proximal humeral construct. Delayed RSA was performed on 6 patients with failed non-operative treatment. The pre- and postoperative Musculoskeletal Tumor Society (MSTS) score and the complications were addressed. RESULTS: Overlapping allograft-RSA composite afforded a stable construct in 11 failed proximal humeral reconstructions and the patient's chief complaints were resolved. The mean time to the union of overlapped allograft-host junction was 5.5 months. Average preoperative MSTS score of 20.3 point increased to 25.7 point, postoperatively. Four of the six patients who had RSA within 4 years from the index operation showed arm elevation of more than 90° whereas the remaining 5 patients showed some disability. The complications include one case each of dislocation and aseptic infection, which were resolved by changing the polyethylene liner and scar revision, respectively. None of the 6 patients who underwent delayed RSA after the failure of non-operative treatment showed arm elevation more than 90°. CONCLUSION: An overlapping allograft-RSA composite is a simple and reliable reconstructive modality in patients with massive bone loss. In patients with metastatic cancer necessitating a surgical resection at presentation, early conversion to RSA is recommended to secure functional recovery.


Subject(s)
Allografts , Arm , Arthroplasty , Cicatrix , Joint Dislocations , Humans , Humerus , Polyethylene , Shoulder
14.
Article in Korean | WPRIM | ID: wpr-714042

ABSTRACT

OBJECTIVE: The aim of this study was to evaluate the characteristics of the emergency medical services (EMS) response and clinical information on mass casualty chemical incidents in Korea. METHODS: This retrospective observational study analyzed the integrated data of the EMS rescue records and EMS-treated severe trauma registry from January 2012 to December 2013. Two databases were integrated using the unique accident identification number. Chemical incidents were defined by an in-depth review of the EMS rescue records according to a previous study. Mass casualty incidents were defined as more than 6 injured individuals. The rescue, EMS, and hospital variables of mass casualty chemical incidents were analyzed. RESULTS: A total of 8 mass casualty chemical incidents and 73 patients were included. The mean responded rescue vehicles and EMS vehicles were 2.4 and 3.5, respectively. The 4 incidents were an oil spill due to traffic accidents and most patients suffered minor trauma. A carbon monoxide leak caused the largest number of patients (23 people). The explosion caused by flammable polyethylene leaks showed the highest severity. In that explosion, the mortality rate was 40% and 8 patients had a disability at discharge. CONCLUSION: This study evaluated the characteristics of the EMS response and clinical information on mass casualty chemical incidents in Korea.


Subject(s)
Accidents, Traffic , Carbon Monoxide , Chemical Hazard Release , Emergency Medical Services , Explosions , Humans , Korea , Mass Casualty Incidents , Mortality , Observational Study , Petroleum Pollution , Polyethylene , Retrospective Studies
15.
Article in Korean | WPRIM | ID: wpr-716874

ABSTRACT

Polyethylene glycol (PEG) is a major component of bowel preparation solution for colonoscopy. It has been recognized as a safe and effective osmotic laxative that is rarely immunogenic. We here report a case of anaphylaxis due to PEG. A 49-year-old female came to the outpatient clinic wanting to find the cause of skin rash, nausea and respiratory difficulty after ingesting bowel evacuant solution (Clicool). She had visited local Emergency Department at the time of event and was diagnosed with anaphylaxis. We performed skin tests with components of Clicool to identify the cause of anaphylactic reactions. The result showed a positive skin response only to PEG. In contrast, skin test done in the control showed no reactions to PEG. This is the first case that revealed PEG to be an exact cause of anaphylaxis after ingesting a bowel evacuant.


Subject(s)
Ambulatory Care Facilities , Anaphylaxis , Colonoscopy , Emergency Service, Hospital , Exanthema , Female , Humans , Middle Aged , Nausea , Polyethylene Glycols , Polyethylene , Skin , Skin Tests
16.
Article in English | WPRIM | ID: wpr-715477

ABSTRACT

Polyethylene is the most common plastic and is mainly used to produce plastic bags, film and bottles. When the molten polyethylene contacts skin,it causes burns and solidifies, so it is important to remove this material properly. However, no report has been issued to date on molten polyethylene contact burns. Here, we present such a case, in which the solidified polyethylene was successfully removed using mayonnaise. A 48-year-old man was burned on the face and neck by molten polyethylene, which had been heated to 200℃. Burned regions were covered with solidified polyethylene. About 15 minutes after spreading mayonnaise on the patient's face and neck, gently rubbing of the mayonnaise into the solidified polyethylene resulted in its successful removal. Mayonnaise has several advantages as it does not evaporate or flow across surfaces like other liquids, and unlike butter does not need to be melted before use. These properties and its ability to emulsify polythene mean that it can be used for the initial treatment of hot polyethylene burns and probably to treat contact burns caused by other petrochemical products.


Subject(s)
Burns , Butter , Hot Temperature , Humans , Middle Aged , Neck , Plastics , Polyethylene
17.
Article in English | WPRIM | ID: wpr-715069

ABSTRACT

OBJECTIVES: The role of alloplastic materials in maxillofacial reconstruction is still controversial. Determining the utility of porous, high-density, polyethylene implants as a highly stable and flexible, porous alloplast, with properties such as rapid vascularization and tissue ingrowth, is crucial in cases of maxillofacial deformities and aesthetic surgery. MATERIALS AND METHODS: Thirty high-density porous polyethylene implants were implanted in 16 patients that had been referred to a private office over a three-year period. These implants were used for correcting congenital deformities, posttraumatic defects and improving the aesthetic in nasal, paranasal, malar, chin, mandibular angle, body and orbital areas. RESULTS: The outcomes of the cases in this study showed good aesthetic and functional results. The majority of patients had no signs of discomfort, rejection or exposure. Two implants suffered complications: a complicated malar implant was managed by antibiotic therapy, and an infected mandibular angle implant was removed despite antibiotic therapy. CONCLUSION: Based on the results, the Medpor implant seems to be an excellent biomaterial for correcting various facial deformities. Advantages include its versatility and relatively ideal pore size that allows for excellent soft tissue ingrowth and coverage. It is strong, flexible and easy to shape.


Subject(s)
Chin , Congenital Abnormalities , Humans , Maxillofacial Prosthesis Implantation , Polyethylene , Prefrontal Cortex , Reconstructive Surgical Procedures
18.
Article in English | WPRIM | ID: wpr-765301

ABSTRACT

OBJECTIVE: The purpose of this study was to compare the cosmetic outcome and complications after cranioplasty (CP) due to three different implant materials, and analyze the mean implant survival and cumulative survival rate based on these results. METHODS: We reviewed 108 patients retrospectively who underwent CP between January 2014 and November 2016. Autologous bone (AB; 45 patients) and synthetic materials with porous polyethylene (PP; 32 patients) and custom-made 3-dimensional printed titanium mesh (CT; 31 patients) were used as implants. RESULTS: Regardless of implanted materials, more than 89.8% of the CP patients were satisfied with the cosmetic outcome. No statistically significant difference was observed among the three groups. The overall postoperative complication rates of each group were 31.1% in the AB group, 15.6% in the PP group and 3.2% in the CT group. The CT group showed lower complication rates compared with AB and PP groups (χ2-test : AB vs. PP, p=0.34; AB vs. CT, p=0.00; PP vs. CT, p=0.03). The AB and PP groups demonstrated a higher post-CP infection rate (11.1% and 6.3%) than the CT group (3.2%). However, no significant difference in the incidence of post-CP infection was observed among the three groups. The PP and CT groups demonstrated a higher mean implant survival time and cumulative survival rate than the AB group at the last follow-up (p < 0.05). CONCLUSION: In comparison with AB and PP, cranioplasty with CT shows benefits in terms of lower post-CP complication, less intraoperative bleeding loss, shorter operation time and in-hospital stay. The PP and CT groups showed higher implant survival time and cumulative survival rate compared with the AB group.


Subject(s)
Bone Resorption , Follow-Up Studies , Hemorrhage , Humans , Incidence , Polyethylene , Postoperative Complications , Reconstructive Surgical Procedures , Retrospective Studies , Survival Rate , Titanium
19.
Article in English | WPRIM | ID: wpr-741578

ABSTRACT

With the development of computer-aided design/computer-aided manufacturing (CAD/CAM) technology, it has been possible to reconstruct the cranio-maxillofacial defect with more accurate preoperative planning, precise patient-specific implants (PSIs), and shorter operation times. The manufacturing processes include subtractive manufacturing and additive manufacturing and should be selected in consideration of the material type, available technology, post-processing, accuracy, lead time, properties, and surface quality. Materials such as titanium, polyethylene, polyetheretherketone (PEEK), hydroxyapatite (HA), poly-DL-lactic acid (PDLLA), polylactide-co-glycolide acid (PLGA), and calcium phosphate are used. Design methods for the reconstruction of cranio-maxillofacial defects include the use of a pre-operative model printed with pre-operative data, printing a cutting guide or template after virtual surgery, a model after virtual surgery printed with reconstructed data using a mirror image, and manufacturing PSIs by directly obtaining PSI data after reconstruction using a mirror image. By selecting the appropriate design method, manufacturing process, and implant material according to the case, it is possible to obtain a more accurate surgical procedure, reduced operation time, the prevention of various complications that can occur using the traditional method, and predictive results compared to the traditional method.


Subject(s)
Calcium , Durapatite , Imaging, Three-Dimensional , Methods , Polyethylene , Reconstructive Surgical Procedures , Titanium
20.
Electron. j. biotechnol ; 25: 58-63, ene. 2017. tab, graf, ilus
Article in English | LILACS | ID: biblio-1008708

ABSTRACT

Background: Sulphur-oxidizing microorganisms are widely used in the biofiltration of total reduced sulphur compounds (odorous and neurotoxic) produced by industries such as the cellulose and petrochemical industries, which include high-temperature process steps. Some hyperthermophilic microorganisms have the capability to oxidize these compounds at high temperatures (N60°C), and archaea of this group, for example, Sulfolobus metallicus, are commonly used in biofiltration technology. Results: In this study, a hyperthermophilic sulphur-oxidizing strain of archaea was isolated from a hot spring (Chillán, Chile) and designated as M1. It was identified as archaea of the genus Sulfolobus (99% homology with S. solfataricus 16S rDNA). Biofilms of this culture grown on polyethylene rings showed an elemental sulphur oxidation rate of 95.15 ± 15.39 mg S l-1 d-1, higher than the rate exhibited by the biofilm of the sulphur-oxidizing archaea S. metallicus (56.8 ± 10.91 mg l-1 d-1). Conclusions: The results suggest that the culture M1 is useful for the biofiltration of total reduced sulphur gases at high temperatures and for other biotechnological applications.


Subject(s)
Sulfides/metabolism , Archaea/metabolism , Biofilms , Oxidation-Reduction , Phylogeny , Polymerase Chain Reaction , Sulfolobus , Archaea/isolation & purification , Archaea/genetics , Polyethylene , Hot Springs/microbiology , Electrophoresis , Filtration , Extremophiles , Hot Temperature
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