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1.
Odontol. vital ; (31): 11-18, jul.-dic. 2019. tab, graf
Article in Spanish | LILACS, BBO | ID: biblio-1091422

ABSTRACT

Resumen Introducción: En la actualidad existen diversos tipos de materiales para la confección de placas bases, como procedimiento para la confección de prótesis dentales. La opción de la lámina de termoformado actualmente es de poco uso, el acrílico de autopolimerización es un material de uso diario en consulta. Objetivo: Comparar las técnicas de confección de placas bases, para determinar cuál de las dos brinda cualidades como menor tiempo de elaboración y menor deformidad. Materiales y métodos: Se seleccionaron por conveniencia 20 modelos de yeso totalmente edéntulos, a los cuales se registra tiempo de elaboración y se les aplican las mismas pruebas de laboratorio. Resultados: Las placas bases termoformadas presentan un tiempo medio de 7 minutos, mientras que las placas bases de acrílico de autopolimerización muestran un tiempo medio de 29 minutos, con base en los análisis de laboratorio la menor deformación se presenta en la placa base de acrílico de autopolimerización. Conclusión: El tiempo de elaboración de la placa base termoformable es menor, mientras que la deformación es mayor en comparación con la de la placa base de autopolimerización, y esta última a su vez, presenta mayor tiempo de elaboración que el de la placa base termoformable.


Abstract Introduction: Currently there are different types of materials for the preparation of base plates, as a procedure for the preparation of dental prostheses. The option of the thermoforming sheet, which is currently of little use, as well as, of self-curing acrylic, a material of daily use in consultation. Objective: To compare the techniques for making base plates, to determine which of the two provide qualities such as shorter processing time and less deformity. Materials and methods: 20 models of gypsum totally edentulous were selected for convenience, to which processing time is recorded and the same laboratory tests are applied. Results: The thermoformed base plates have an average time of 7 minutes, while the self-polymerized acrylic base plates have an average time of 29 minutes, based on the laboratory analysis the least deformation occurs in the acrylic base plate of autopolimerization. Conclusion: The time of preparation of the thermoformable base plate is less, while the deformation is greater compared to the base plate of self-polymerizatíon, the latter in turn, has a longer processing time than the thermoformable base plate.


Subject(s)
Acrylic Resins/therapeutic use , Dental Prosthesis/instrumentation , Polymethyl Methacrylate/therapeutic use
2.
Clinics ; 74: e346, 2019. tab, graf
Article in English | LILACS | ID: biblio-1011920

ABSTRACT

OBJECTIVES: To evaluate the safety and efficacy of a novel bone cement-injectable cannulated pedicle screw augmented with polymethylmethacrylate in osteoporotic spinal surgery. METHODS: This study included 128 patients with osteoporosis (BMD T-score −3.2±1.9; range, −5.4 to -2.5) who underwent spinal decompression and instrumentation with a polymethylmethacrylate-augmented bone cement-injectable cannulated pedicle screw. Postoperative Visual Analogue Scale scores and the Oswestry Disability Index were compared with preoperative values. Postoperative plain radiographs and computed tomography (CT) scans were performed immediately after surgery; at 1, 3, 6, and 12 months; and annually thereafter. RESULTS: The mean follow-up time was 42.4±13.4 months (range, 23 to 71 months). A total of 418 polymethylmethacrylate-augmented bone cement-injectable cannulated pedicle screws were used. Cement extravasations were detected in 27 bone cement-injectable cannulated pedicle screws (6.46%), mainly in cases of vertebral fracture, without any clinical sequela. The postoperative low back and lower limb Visual Analogue Scale scores were significantly reduced compared with the preoperative scores (<0.01), and similar results were noted for the Oswestry Disability Index score (p<0.01). No significant screw migration was noted at the final follow-up relative to immediately after surgery (p<0.01). All cases achieved successful bone fusion, and no case required revision. No infection or blood clots occurred after surgery. CONCLUSIONS: The polymethylmethacrylate-augmented bone cement-injectable cannulated pedicle screw is safe and effective for use in osteoporotic patients who require spinal instrumentation.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Postoperative Complications/etiology , Bone Cements/therapeutic use , Spinal Fractures/surgery , Polymethyl Methacrylate/therapeutic use , Cementoplasty/methods , Pedicle Screws/adverse effects , Osteoporosis/diagnostic imaging , Spinal Fusion/methods , Tomography, X-Ray Computed , Follow-Up Studies , Spinal Fractures/diagnostic imaging , Treatment Outcome , Lumbar Vertebrae/surgery , Lumbar Vertebrae/diagnostic imaging
3.
RFO UPF ; 24(3): 367-374, 2019. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1357676

ABSTRACT

Objetivo: este artigo se propõe a discutir as diferentes modalidades de tratamento de fraturas de osso frontal, demonstradas em uma série de casos clínicos. Relato de casos: três pacientes de gênero variado e com diferentes etiologias de trauma, foram submetidos à cranioplastia, devido a fraturas das corticais externa e interna do osso frontal (além de fixação de outras fraturas de face, em dois dos casos). Nessa série, são apresentados tratamentos com uso de prótese customizada de polimetilmetacrilato, idealizada sobre um protótipo, reconstrução da bossa frontal a partir de telas de titânio e ainda redução óssea com fixação por meio de placas e parafusos. Em todos os casos apresentados, os resultados estéticos e funcionais foram satisfatórios. Considerações finais: baseado no que foi discutido, entendemos que o planejamento deve ser realizado de forma individual e a decisão por qualquer técnica vai depender da gravidade e da extensão da fratura. Para tanto, é necessária uma avaliação criteriosa do caso em questão.(AU)


Objective: This study aims to discuss the different treatment modalities of frontal bone fractures presented in a series of clinical cases. Case report: Three patients of different genders and with different trauma etiologies were subjected to cranioplasty due to fractures of the external and internal cortical of the frontal bone (besides the fixation of other facial fractures, in two of the cases). This series presents treatments using a custom polymethylmethacrylate prosthesis designed on a prototype, the reconstruction of the frontal vault from titanium meshes, and bone reduction with fixation using plates and screws. In all cases presented, the aesthetic and functional results were satisfactory. Final Considerations: The study discussions allow understanding that planning should be performed individually and the decision for any technique will depend on the severity and extent of the fracture. Therefore, a careful assessment of the case in question is required.(AU)


Subject(s)
Humans , Male , Female , Adolescent , Adult , Skull Fractures/surgery , Craniotomy/methods , Frontal Bone/injuries , Skull Fractures/diagnostic imaging , Zygoma/injuries , Tomography, X-Ray Computed , Treatment Outcome , Polymethyl Methacrylate/therapeutic use , Frontal Bone/diagnostic imaging
4.
RFO UPF ; 23(1): 48-54, 15/08/2018. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-910181

ABSTRACT

Objetivo: este trabalho visa a apresentar uma série detrês casos clínicos com diferentes condutas para tratamentode fraturas de assoalho de órbita. Relato decasos: no primeiro caso, o paciente, sexo masculino,foi vítima de ferimento por arma de fogo, apresentandodiplopia, trismo e queixas estéticas. A conduta seguidafoi reconstrução do assoalho da órbita com telade titânio isolada. No segundo caso, o paciente, sexomasculino, foi vítima de acidente motociclístico, apresentandodiplopia e enoftalmo. A conduta seguida foireconstrução utilizando associação de tela de titâniocom polimetilmetacrilato (PMMA). No terceiro caso, opaciente, sexo masculino, foi vítima de acidente automobilístico,apresentando enoftalmo, diplopia e perdade projeção malar. A conduta seguida foi reconstruçãoutilizando associação da tela de titânio com PMMA.Nos três casos, os pacientes evoluíram com melhora doquadro clínico, mostrando-se satisfeitos com os resultadosestético e funcional. Considerações finais: emboraas condutas sejam diversificadas e variem entre cirurgiões,é importante o conhecimento das técnicas e dosmateriais a serem utilizados, bem como das vantagense desvantagens de cada intervenção, sendo de fundamentalimportância também a avaliação de cada casoem particular. (AU)


Objective: this study aims to present a series of three clinical cases with different approaches to the treatment of orbital floor fracture. Case reports: in the first case, the male patient was a victim of gunshot wounds, presenting diplopia, trismus, and aesthetic complaints. The treatment selected was the reconstruction of the orbital floor with an isolated titanium mesh. In the second case, the male patient was a victim of a motorcycle accident, evolving with diplopia and enophthalmos. The procedure followed was reconstruction using the association of a titanium mesh with polymethyl methacrylate (PMMA). In the third case, the male patient was the victim of an automobile accident, presenting enophthalmos, diplopia, and loss of malar projection. In this case, the reconstruction procedure was adopted using the association of a titanium mesh with PMMA. In all three cases, the patients evolved with improvement of the clinical condition, showing satisfaction with the aesthetic and functional results. Final considerations: although there are several procedures that vary among surgeons, it is important to understand the techniques and materials used, as well as the advantages and disadvantages of each intervention; it is also essential to assess each case in particular. (AU)


Subject(s)
Humans , Male , Orbital Fractures/surgery , Plastic Surgery Procedures/methods , Orbital Fractures/diagnostic imaging , Surgical Mesh , Bone Cements/therapeutic use , Tomography, X-Ray Computed , Treatment Outcome , Polymethyl Methacrylate/therapeutic use
5.
Arq. bras. med. vet. zootec. (Online) ; 69(4): 901-907, jul.-ago. 2017. ilus, tab
Article in English | LILACS, VETINDEX | ID: biblio-876682

ABSTRACT

Pelvic fractures correspond to 20 to 30 % of the fractures observed in dogs. Complete fractures, especially with bone axis deviation should be surgically treated. The mechanical study of surgical techniques is of utmost importance to assess the best way of treating these injuries. This study compared, biomechanically, the use of a dynamic compression plate (DCP) and screws (group 1) or screws and polymethylmethacrylate (PMMA) (group 2) to stabilize an iliac fracture using a static test. Sixteen canine synthetic hemi-pelvises (test specimens) with a transverse iliac osteotomy were used. After fixation with implants, a load was applied to the acetabulum until failure. Group 1 maximal compressive load was 133.9±18.60 N, displacement at yield 21.10±3.59mm and stiffness 125.22±12.25N/mm. Group 2 maximal compressive load was 183.50±27.38N, displacement at yield 16.66±5.42mm and stiffness 215.68±33.34N/mm. The stabilization with polymethylmethacrylate was stronger than dynamic compression plate since it resisted a greater load in all test specimens.(AU)


As fraturas da pelve são frequentes em cães, correspondendo a 20-30% das fraturas encontradas na espécie. A grande maioria delas é tratada cirurgicamente, principalmente aquelas que apresentam desvio ósseo. O estudo mecânico das técnicas cirúrgicas é de extrema importância para avaliação da melhor maneira de tratamento destas lesões. O objetivo deste estudo foi comparar, do ponto de vista biomecânico, a fixação das fraturas do ílio utilizando uma placa de compressão dinâmica ou parafusos associados ao polimetilmetacrilato, por meio de um teste estático. Foram utilizadas 16 hemipelves caninas de origem sintética, nas quais uma osteotomia transversa foi realizada no corpo do ílio. As fixações foram divididas em dois grupos: fixação com placa de compressão dinâmica e parafusos (grupo1) ou parafusos associados ao polimetilmetacrilato (grupo 2). Posteriormente à fixação dos implantes foi aplicada uma carga no acetábulo de cada corpo de prova até a falha. O grupo 2 apresentou força máxima de aplicação de carga a média de 133.9±18.60N, deflexão 21.10±3.59mm e rigidez 125.22±12.25N/mm. O grupo 2 apresentou força máxima de aplicação de carga a média de 183.50±27.38N, deflexão 16.66±5.42mm e rigidez 215.68±33.34N/mm. A estabilização com o polimetilmetacrilato mostrou ser mais resistente, pois resistiu a uma maior quantidade de carga em relação à placa de compressão dinâmica, em todos os corpos de prova.(AU)


Subject(s)
Animals , Dogs , Biomechanical Phenomena , Fracture Fixation, Internal/veterinary , Internal Fixators/veterinary , Pelvis/injuries , Polymethyl Methacrylate/therapeutic use , Polyurethanes , Fractures, Bone/surgery
6.
Rev. bras. cir. plást ; 32(1): 46-55, 2017. ilus, tab
Article in English, Portuguese | LILACS | ID: biblio-832676

ABSTRACT

Introdução: A craniectomia descompressiva é uma cirurgia indicada no tratamento da hipertensão intracraniana em situações graves de traumas cranioencefálicos. Esta cirurgia confere uma aparência bizarra ao paciente, como se "parte da cabeça" houvesse sido retirada. Após a regressão do edema cerebral e quando o paciente reunir boas condições clínicas, a reconstrução craniana está indicada. A reconstrução da calota craniana poderá ser realizada com osso autólogo ou com materiais aloplásticos. Este estudo objetiva apresentar a experiência do autor com reconstruções de calota craniana utilizando próteses customizadas de PMMA. Métodos: Foram selecionados 14 pacientes submetidos à craniectomia descompressiva que, após serem liberados clinicamente pela Neurocirurgia, realizaram a reconstrução da calota craniana com próteses de PMMA customizadas por prototipagem entre os anos de 2014 e 2015 e com, no mínimo, 6 meses de pós-operatório. Sinais e sintomas de síndrome do Trefinado, tomografia computadorizada e aparência estética dos pacientes foram analisadas no pré e no 6º mês pós-operatório. Resultados: Todos os pacientes apresentaram melhora sintomatológica, melhora estética e expansão cerebral após a cirurgia. Conclusão: A reconstrução da calota craniana com prótese customizada de PMMA promoveu a melhora dos sinais e sintomas e da aparência estética de todos os 14 pacientes operados. A utilização de protótipos para customizar próteses cranianas facilitou a técnica operatória e possibilitou a recuperação de um contorno craniano muito próximo da normalidade.


Introduction: Decompressive craniectomy is indicated for the treatment of intracranial hypertension in cases of serious traumatic brain injury. This surgery results in a bizarre appearance, as if "part of the head" had been. After regression of cerebral edema and when the patient is in good clinical condition, the reconstruction of the skull is indicated. Reconstruction of the skull can be performed with autologous bone or with alloplastic materials. This study sought to present the experience of the author with skull reconstructions using custom PMMA prostheses. Methods: In between 2014 and 2015, fourteen patients with previous (longer than 6 months) decompressive craniectomies were selected after Neurosurgery medical clearance and underwent skull reconstruction with customized PMMA prototyped prostheses. Signs and symptoms of syndrome of the trephined, computed tomography, and aesthetic appearance of the patients were analyzed preoperatively and at 6 months after reconstruction. Results: All patients presented with improved symptomatology, aesthetic improvement and expansion of the brain after surgery. Conclusion: Reconstruction of the skull with customized prototyped PMMA prostheses improved the signs and symptoms and the aesthetic appearance in all 14 patients of this series. The use of prototypes to customize cranial prostheses facilitates the operative technique and enables patients to develop a nearly normal cranial contour.


Subject(s)
Humans , Male , Child , Adolescent , Adult , History, 21st Century , Parietal Bone , Prostheses and Implants , Skull , Prospective Studies , Intracranial Hypertension , Polymethyl Methacrylate , Esthetics , Decompressive Craniectomy , Craniocerebral Trauma , Parietal Bone/surgery , Parietal Bone/transplantation , Skull/surgery , Intracranial Hypertension/surgery , Intracranial Hypertension/pathology , Intracranial Hypertension/therapy , Polymethyl Methacrylate/therapeutic use , Plastic Surgery Procedures , Plastic Surgery Procedures/methods , Esthetics/psychology , Decompressive Craniectomy/methods , Craniocerebral Trauma/surgery , Craniocerebral Trauma/pathology , Craniocerebral Trauma/therapy
7.
Rev. Clín. Ortod. Dent. Press ; 15(3): 33-59, jun.-jul. 2016. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-856055

ABSTRACT

Introdução: resultados estéticos na cirurgia ortognática são um dos principais objetivos dos pacientes, ortodontistas e cirurgiões. A correção da deformidade óssea maxilomandibular, geralmente, restabelece as funções do sistema estomatognático e a estética facial. No entanto, nem sempre obtém-se simetria e projeção desejada dos tecidos moles somente com a movimentação óssea. Nesse sentido, o preenchimento com o polimetilmetacrilato (PMMA) atua como coadjuvante na tentativa de se obter contornos faciais que alcancem as expectativas estéticas dos pacientes e profissionais. Objetivo: o presente artigo revisa a utilização do metilmetacrilato como material de preenchimento na região craniofacial, abordando a sua perspectiva histórica, vantagens e aspectos biológicos. As principais indicações são ilustradas com figuras e casos clínicos


Subject(s)
Orthognathic Surgery/methods , Methylmethacrylate/therapeutic use , Polymethyl Methacrylate/therapeutic use , Stomatognathic System Abnormalities/therapy
8.
An. bras. dermatol ; 91(2): 209-211, Mar.-Apr. 2016. graf
Article in English | LILACS | ID: lil-781359

ABSTRACT

Abstract The scleroderma en coup de sabre is a variant of localized scleroderma that occurs preferentially in children. The disease progresses with a proliferative and inflammatory phase and later atrophy and residual deformity, which are treated with surgical techniques such as injectable fillers, transplanted or autologous fat grafting and resection of the lesion. Among the most widely used fillers is hyaluronic acid. However, there are limitations that motivate the search for alternatives, such as polymethylmethacrylate, a permanent filler that is biocompatible, non-toxic, non-mutagenic and immunologically inert. In order to illustrate its application, a case of scleroderma en coup de sabre in a 17-year-old patient, who was treated with polymethylmethacrylate with excellent aesthetic results, is reported.


Subject(s)
Humans , Male , Adolescent , Scalp Dermatoses/drug therapy , Scleroderma, Localized/drug therapy , Antimutagenic Agents/therapeutic use , Polymethyl Methacrylate/therapeutic use , Scalp Dermatoses/pathology , Scleroderma, Localized/pathology , Reproducibility of Results , Treatment Outcome , Forehead
9.
Rev. bras. cir. plást ; 31(2): 269-272, 2016. ilus
Article in English, Portuguese | LILACS | ID: biblio-1574

ABSTRACT

Os autores apresentam o caso de uma paciente submetida 7 anos após aplicação de polimetilmetacrilato (PMMA) a um facelift com implante de prótese mentoniana, o qual evoluiu com granuloma por corpo estranho em região distante da aplicação do preenchimento. Após quase um ano de tratamento, a paciente evoluiu com resolução do caso.


The authors present the case of a patient who underwent a facelift with a chin implant 7 years after polymethylmethacrylate (PMMA) implantation, which evolved with foreign body granuloma in a region distant from the filling application. After nearly a year of treatment, the patient evolved with resolution of the granuloma.


Subject(s)
Humans , Female , Middle Aged , History, 21st Century , Prostheses and Implants , Rhytidoplasty , Giant Cells, Foreign-Body , Granuloma, Foreign-Body , Polymethyl Methacrylate , Dermal Fillers , Prostheses and Implants/standards , Rhytidoplasty/adverse effects , Rhytidoplasty/methods , Giant Cells, Foreign-Body/pathology , Granuloma, Foreign-Body/surgery , Granuloma, Foreign-Body/pathology , Granuloma, Foreign-Body/therapy , Polymethyl Methacrylate/standards , Polymethyl Methacrylate/therapeutic use , Plastic Surgery Procedures , Plastic Surgery Procedures/methods , Face , Face/surgery , Dermal Fillers/therapeutic use
10.
Rev. bras. cir. plást ; 31(2): 216-228, 2016. ilus, tab
Article in English, Portuguese | LILACS | ID: biblio-1564

ABSTRACT

INTRODUÇÃO: Pacientes que vivem com síndrome da imunodeficiência adquirida (AIDS) em uso da Terapia Antirretroviral de Alta Potência (TARV) são suscetíveis a desenvolver síndrome lipodistrófica. O preenchimento facial com polimetilmetacrilato é opção de tratamento. O objetivo é analisar o procedimento de preenchimento facial e avaliar os pacientes em relação à percepção, incômodo, revelação do diagnóstico, expectativa quanto ao preenchimento e a satisfação e impacto em suas vidas. MÉTODOS: Análise em 63 pacientes submetidos ao preenchimento facial. Foram realizados procedimentos, analisados prontuários dos pacientes e o Protocolo do Ambulatório de Lipodistrofia do Programa Municipal de doenças sexualmente transmissíveis (DST)/AIDS e Hepatites Virais de São Bernardo do Campo, atendidos no período de janeiro a julho de 2009. RESULTADOS: Todos os 63 pacientes iniciais que concordaram em participar da pesquisa permaneceram até o término deste trabalho. Apenas seis pacientes (9,5%) eram de origem de outros municípios, enquanto 57 pacientes (90,5%) eram moradores de São Bernardo. 68,2% eram homens e 100% brancos. A média das idades foi 49,7 anos. Em média, o Vírus da Imunodeficiência Humana (HIV) foi diagnosticado há 11,5 anos, com tempo médio de uso de TARV por 10 anos e tempo médio de lipoatrofia facial de 3,8 anos. A maioria fez uso de Estavudina e/ou Efavirenz. Quem ficava mais desconfortável com as alterações na face eram os próprios pacientes. 85,7% não revelaram o diagnóstico para terceiros. 100% dos pacientes ficaram satisfeitos ou muito satisfeitos com o resultado obtido. CONCLUSÃO: 100% dos pacientes ficaram satisfeitos ou muito satisfeitos com o resultado obtido. Em 100% dos casos houve um impacto favorável na vida. Não houve efeitos adversos ao procedimento cirúrgico de preenchimento.


INTRODUCTION: Patients with acquired immunodeficiency syndrome (AIDS) who use highly active antiretroviral therapy (HAART) can develop lipodystrophy syndrome, for which facial filling with polymethylmethacrylate is a treatment option. The objective is to analyze the procedure of facial filling and evaluate patients in relation to their perception, discomfort, revelation of the diagnosis to third parties, expectation concerning facial filling, and satisfaction with the treatment outcome and its impact on their lives. METHODS: Sixty-three patients who underwent facial filling were evaluated. Procedures performed between January and July 2009 were assessed, the records of the patients were analyzed, and the outpatient lipodystrophy protocol of the STD/AIDS and Viral Hepatitis Municipal Program of São Bernardo do Campo was used. RESULTS: All the 63 patients who agreed to participate in the research completed the study. Only 6 patients (9.5%) were from other municipalities, while 57 patients (90.5%) were residents of São Bernardo. Of the patients, 68.2% were men and 100% were Caucasian. The mean age of the patients was 49.7 years. Human immunodeficiency virus was diagnosed 11.5 years prior on average, with 10-year average use of HAART and 3.8-year average time of facial lipoatrophy. Most of the patients used stavudine and/or efavirenz. The patients themselves felt more uncomfortable with facial changes. Among the patients, 85.7% did not reveal the diagnosis to third parties. CONCLUSION: All of the patients were satisfied or very satisfied with the result obtained, which had a favorable impact on their lives. The filling surgical procedure had no adverse effects.


Subject(s)
Humans , Male , Middle Aged , History, 21st Century , HIV Infections , Medical Records , Acquired Immunodeficiency Syndrome , HIV , Patient Satisfaction , Stavudine , Polymethyl Methacrylate , Plastic Surgery Procedures , Evaluation Study , Antiretroviral Therapy, Highly Active , Face , Lipodystrophy , HIV Infections/surgery , HIV Infections/pathology , Medical Records/standards , Acquired Immunodeficiency Syndrome/surgery , Acquired Immunodeficiency Syndrome/complications , Patient Satisfaction/statistics & numerical data , Stavudine/therapeutic use , Polymethyl Methacrylate/therapeutic use , Plastic Surgery Procedures/methods , Antiretroviral Therapy, Highly Active/methods , Face/surgery , Lipodystrophy/surgery , Lipodystrophy/metabolism
11.
Rev. otorrinolaringol. cir. cabeza cuello ; 75(3): 251-256, dic. 2015. ilus
Article in Spanish | LILACS | ID: lil-771697

ABSTRACT

La rinomodelación es un procedimiento en el cual se utilizan materiales de relleno inyectables para modificar el perfil nasal. Han existido más de 150 rellenos dérmicos en el mercado global, pero ninguno logra reunir todas las características ideales. El polimetilmetacrilato (PMMA) ha sido utilizado en medicina por más de 50 años como relleno dérmico y ha sido aprobado por la FDA para su uso en corrección de pliegues nasolabiales. Tras la inyección de PMMA, las microesferas generan una respuesta inflamatoria a cuerpo extraño ya que no pueden ser fagocitadas por macrófagos ni por células gigantes, dado su tamaño, permaneciendo en el tejido inalteradas. El tejido de granulación y las fibras colágenas crecen en torno a las microesferas, encapsulándolas. Se considera un producto permanente ya que el PMMA no se degrada en el tiempo. La punta nasal es un área donde se pueden obtener buenos resultados con rellenos inyectables, pero debe ser tratada con pequeños volúmenes para evitar potenciales efectos adversos, principalmente el compromiso vascular de la piel. Presentamos el caso de un paciente sometido a rinoplastía no quirúrgica con inyección de PMMA (Metacrill®) en la punta nasal y su revisión quirúrgica secundaria.


Filler rhinoplasty is a procedure in which dermal fillers are used to alter the nasal profile without invasive surgery. There have been more than 150 fillers in the global market, though none of them are considered ideal. Polymethylmetacrylate (PMMA) has been used in medical practice for more than 50 years as a dermal filler and has been approved by the FDA for the correction of nasolabial folds. Once inyected, the PMMA micro spheres cause a foreign body inflammatory reaction, yet they cannot be removed by phagocytosis because of their large size, remaining unaltered in time. Granulation tissue and collagen fibers grow sorrounding and encapsulating the micro spheres. It is considered a permanent filler due to the remainance of the PMMA micro spheres in the skin. The nasal tip is an area easy to treat with fillers, though it must be managed with small volumes to avoid adverse reactions, mainly vascular compromise of the skin. We present the case of a patient who underwent a filler rhinoplasty with PMMA (Metacrill®) in the nasal tip and a subsequent secondary revision rhinoplasty.


Subject(s)
Humans , Female , Middle Aged , Rhinoplasty/methods , Nose/surgery , Polymethyl Methacrylate/therapeutic use , Dermal Fillers/therapeutic use , Treatment Outcome
12.
Rev. bras. cir. plást ; 30(4): 664-667, sep.-dec. 2015. ilus
Article in English, Portuguese | LILACS | ID: biblio-1422

ABSTRACT

O uso de implantes sintéticos para o preenchimento na face pode acarretar reações adversas. Estas podem ocorrer da má técnica ou decorrentes do produto. Entre os materiais utilizados, está o polimetilmetacrilato (PMMA) na forma de microesferas. Trata-se do relato de um caso de reação nodular na face de paciente do sexo feminino, após 15 anos do uso de implante de Artecoll®, produto composto por microesferas de colágeno bovino e PMMA. Foi tratada com laser de gás carbônico. Evidenciou-se o efeito tardio provocado da aplicação de implantes sintéticos na face como o Artecoll®, os fatores limitantes para ressecção convencional com bisturi e tesoura, e a opção da utilização do laser de CO2. Destacando-se a função ablativa e precisa na remoção do tecido comprometido, a preservação dos tecidos sadios e nobres, o grande potencial hemostático e a baixa morbidade, com menor cicatriz, edema, equimose e a rápida recuperação pós-operatória.


The use of synthetic implants as dermal facial fillers may cause adverse reactions, which may occur owing to inappropriate techniques or the intrinsic nature of the product. Polymethylmetacrylate (PMMA) microspheres is one of the materials used. This is a report of a case of nodular reaction in the face of a female patient, after 15 years of Artecoll® implant use, a product composed of microspheres of bovine collagen and PMMA. She was treated with a carbon dioxide laser. The delayed effect caused by the application of synthetic implants in the face, such as Artecoll®; the limiting factors of conventional resection with a scalpel and scissors; and the option for the use of carbon dioxide laser are outlined. Highlighted are the ablative and precise functions in the removal of compromised tissue, the preservation of healthy and noble tissues, the high hemostatic potential, and low morbidity, with smaller scars, edema, ecchymosis, and rapid postoperative recovery.


Subject(s)
Humans , Female , Middle Aged , History, 21st Century , Postoperative Complications , Surgery, Plastic , Muscular Atrophy , Polymethyl Methacrylate , Face , Facial Bones , Nasolabial Fold , Lasers , Postoperative Complications/surgery , Surgery, Plastic/methods , Muscular Atrophy/surgery , Polymethyl Methacrylate/adverse effects , Polymethyl Methacrylate/therapeutic use , Face/surgery , Facial Bones/surgery , Nasolabial Fold/surgery , Lasers/adverse effects
13.
Article in English | IMSEAR | ID: sea-154601

ABSTRACT

Recent years have been dominated by research in nano science. Dentistry is no exception and there is increased research on nanoparticles in dentistry. Complete dentures increase the carriage of Candida in healthy patients, and the proliferation of C. albicans can be associated with denture-induced stomatitis. Purpose: To evaluate the anti-Candida effect of heat cure denture base resins reinforced with Ag° in the ratio of 4:1, 3:1, 2:1 (Groups B, C, and D, respectively) to the weight of denture base resins. Materials and Methods: Ag° were synthesized by chemical reduction method, incorporated into the polymer powder according to the ratio for each group, subjected to polymerization and microbial assay was calculated for the reference C. albicans strains by agar diffusion method for the incubation period of 24 h. Results: Group D showed multifold decrease in the colony-forming units. Conclusion: The antimicrobial effect of silver could be used vividly in the denture base for immunocompromised and geriatric patients.


Subject(s)
Candida albicans/drug therapy , Candida albicans/therapy , Hot Temperature/therapeutic use , Nanoparticles/therapeutic use , Polymethyl Methacrylate/therapeutic use , /therapeutic use , /drug therapy , /therapy
14.
Pesqui. vet. bras ; 34(2): 173-178, fev. 2014. ilus
Article in Portuguese | LILACS | ID: lil-709862

ABSTRACT

Foi realizada falha segmentar com 6mm de diâmetro na região metafisária medial de tíbias de 12 coelhos, onde foi implantado uma associação de micro e macrofragmentos de matriz óssea cortical heteróloga fragmentada conservada em glicerina (98%) e polimetilmetacrilato autoclavados, para a sua reconstrução, e avaliados radiológica e macroscopicamente aos 30, 60, 90 e 120 dias. Houve adesão, em relação ao tempo, dos micro e macrocompósitos ao leito receptor, em 100% dos casos, mostrando ser biologicamente biocompatível, pois promoveram a reparação de falhas ósseas, sem sinais de infecção, migração e/ou rejeição, podendo, dessa forma, ser mais uma opção como substituto para preencher grandes defeitos ósseos.


A segmental defect of 6mm diameter was performed in the medial metaphyseal region of the tibia of 12 rabbits. For the bone defect reconstruction there was implanted a combination of micro and macro fragments of heterologous fragmented cortical bone matrix preserved in glycerin (98%) and polymethylmethacrylate, both autoclaved. Radiological and macroscopic evaluation was performed at 30, 60, 90 and 120 days. Adhesion in relation to time of the micro and macro composites to the recipient bed was observed in 100% of the cases. This showed that this implant is biologically biocompatible, since it promoted bone defects repair, with no signs of infection, migration and/or rejection. In this way, this implant can be classified as one more option of substitute to fill large bone defects.


Subject(s)
Animals , Bone Matrix , Rabbits/injuries , Polymethyl Methacrylate/therapeutic use , Tibia/injuries , Biocompatible Materials/therapeutic use , Technology, Radiologic
15.
Rev. bras. cir. plást ; 29(4): 550-556, 2014. tab, ilus
Article in English, Portuguese | LILACS | ID: biblio-849

ABSTRACT

INTRODUÇÃO: Nos estágios finais da reconstrução torácica, consequente a exéreses tumorais, são necessários procedimentos complexos e implantes. O que requer cuidados multidisciplinares, com a participação dos cirurgiões torácicos, plástico, radiologista e fisioterapeuta. O objetivo foi descrever as opções de reconstrução torácica após ressecção de neoplasia, realizado no Hospital Sarah Brasília. MÉTODO: Estudo retrospectivo de reconstrução torácica em tempo único, após excisão de tumor, fisioterapia respiratória com ventilação não invasiva e exercícios. RESULTADOS: Entre 2007 a 2012 foram operados 10 pacientes, sete homens e três mulheres; idade 10 a 31 anos; oito apresentavam tumores torácicos metastáticos (osteosarcoma, sinoviosarcoma, Fibrosarcoma epitelioide esclerosante e Rabdomiosarcoma) e dois originários da parede torácica (fibromatose e condrosarcoma). Observou-se boa evolução no pós-operatório imediato, com extubação ao final da cirurgia, retirada do dreno torácico entre 5° e 8° PO. As complicações foram: atelectasia (10%), recorrência tumoral (10%), e óbito em 3 (30%) casos . CONCLUSÃO: Foi possível a reconstrução torácica em tempo único utilizando tela de polipropileno, polimetilmetacrilato e retalhos musculares, com recuperação precoce da função pulmonar e baixo índice de complicações imediatas.


INTRODUCTION: Complex procedures and implants are required in the final stages of chest wall reconstruction after tumor excision. This process requires multidisciplinary care with participation from thoracic and plastic surgeons, a radiologist, and a physical therapist. The goal of this study was to describe the options for chest wall reconstruction after neoplasm resection at Hospital Sarah Brasilia. METHOD: A retrospective study of one-time chest wall reconstruction after tumor excision, respiratory physical therapy with noninvasive ventilation, and exercises was conducted. RESULTS: Between 2007 and 2012, 10 patients underwent surgery (seven men, three women; age range: 10-31 years); eight patients had metastatic thoracic tumors (e.g., osteosarcoma, synovial sarcoma, sclerosing epithelioid fibrosarcoma, and rhabdomyosarcoma) and two had tumors originating from the chest wall (fibromatosis and chondrosarcoma). The outcomes were good after the immediate postoperative period, with extubation occurring at the end of surgery and chest tube removal between the fifth and eighth postoperative day. Three cases (30%) involved complications of atelectasis (10%), tumor recurrence (10%), or death. CONCLUSION: One-time chest wall reconstruction using polypropylene mesh, polymethylmethacrylate, and muscle flaps was possible and was associated with early recovery of pulmonary function and a low rate of immediate complications.


Subject(s)
Humans , Male , Female , Child , Adolescent , Adult , History, 21st Century , Polypropylenes , Thoracic Neoplasms , Thoracic Surgery , Thoracoplasty , Thorax , Medical Records , Review , Polymethyl Methacrylate , Plastic Surgery Procedures , Evaluation Study , Thoracic Wall , Polypropylenes/therapeutic use , Polypropylenes/chemistry , Thoracic Neoplasms/surgery , Thoracic Neoplasms/physiopathology , Thoracic Neoplasms/therapy , Thoracic Surgery/methods , Thoracoplasty/methods , Thorax/physiology , Thorax/pathology , Medical Records/standards , Polymethyl Methacrylate/therapeutic use , Polymethyl Methacrylate/chemistry , Plastic Surgery Procedures/methods , Thoracic Wall/surgery , Thoracic Wall/physiopathology , Thoracic Wall/pathology
16.
An. bras. dermatol ; 88(4): 570-577, ago. 2013. tab, graf
Article in English | LILACS | ID: lil-686517

ABSTRACT

BACKGROUND: HIV/AIDS-Associated Lipodystrophy Syndrome includes changes in body fat distribution, with or without metabolic changes. The loss of fat from the face, called facial lipoatrophy, is one of the most stigmatizing signs of the syndrome. OBJECTIVES: To evaluate the effect of FL treatment using polymethylmethacrylate (PMMA) implants on disease progression, assessed by viral load and CD4 cell count. METHODS: This was a prospective study of 44 patients treated from July 2009 to December 2010. Male and female patients, aged over 18 years, with clinically detectable FL and who had never been treated were included in the study. PMMA implantation was done to fill atrophic areas. Laboratory tests were conducted to measure viral load and CD4 count before and after treatment. RESULTS: Of the 44 patients, 72.72% were male and 27.27% female, mean age of 44.38 years. Before treatment, 82% of patients had undetectable viral load, which increased to 88.6% after treatment, but without statistical significance (p = 0.67). CD4 count before treatment ranged from 209 to 1293, averaging 493.97. After treatment, the average increased to 548.61. The increase in CD4 count after treatment was statistically significant with p = 0.02. CONCLUSION: The treatment of FL with PMMA implants showed a statistically significant increase in CD4 count after treatment, revealing the impact of FL treatment on disease progression. Viral load before ...


FUNDAMENTOS: A Síndrome Lipodistrófica Associada ao HIV/AIDS compreende alterações na distribuição da gordura corporal, acompanhada ou não de alterações metabólicas. A perda da gordura facial, chamada lipoatrofia facial, é dos sinais mais estigmatizantes da síndrome. OBJETIVOS: Avaliar o impacto do tratamento dalipoatrofia facial com implante de polimetilmetacrilato sobre a progressão da doença, avaliada pela contagem da carga viral e a contagem de células CD4. MÉTODOS: Estudo prospectivlipoatrofia facial clinicamente detectável e sem tratamento prévio. Foi realizado implante de polimetilmetacrilato para preenchimento das áreas atróficas. Foram realizadas contagem da carga viral e células CD4 antes e após o tratamento. RESULTADOS: Dos 44 pacientes, 72,72% eram do sexo masculino e 27,27% do feminino, e idade média de 44,38 anos. Antes do tratamento, 82% dos pacientes apresentavam carga viral indetectável, que aumentou para 88,6% após o tratamento, mas sem significância estatística (p=0,67). A contagem de CD4 antes do implante variou de 209 a 1293, com média de 493,97. Após o tratamento, essa média aumentou para 548,61. O aumento do CD4 após o tratamento foi estatisticamente significativo, com p=0,02. CONCLUSÃO: O tratamento dalipoatrofia facial com implante de polimetilmetacrilato ...


Subject(s)
Adult , Female , Humans , Male , Middle Aged , HIV-Associated Lipodystrophy Syndrome/therapy , Polymethyl Methacrylate/therapeutic use , Viral Load , Biocompatible Materials/therapeutic use , Disease Progression , Face , HIV-Associated Lipodystrophy Syndrome/immunology , HIV-Associated Lipodystrophy Syndrome/virology , Prospective Studies , Prostheses and Implants , Reference Values , Statistics, Nonparametric , Treatment Outcome
17.
Rev. bras. cir. plást ; 27(3): 387-391, jul.-set. 2012. ilus
Article in English, Portuguese | LILACS | ID: lil-668137

ABSTRACT

INTRODUÇÃO: O início do tratamento da síndrome da imunodeficiência adquirida (AIDS) com a terapia antirretroviral de alta atividade (HAART), na década de 1990, aumentou, consideravelmente, a longevidade e a qualidade de vida dos portadores da doença. A redução da morbidade e da mortalidade associadas a doenças infecciosas e neoplásicas oportunistas, porém, tem sido acompanhada pelo aumento da prevalência de outras doenças, entre elas a lipodistrofia associada ao vírus da imunodeficiência humana (HIV). A lipodistrofia decorre da toxicidade de drogas utilizadas na terapia antirretroviral, sendo atribuída aos inibidores de protease e aos inibidores da transcriptase reversa análogos do nucleosídeo. Este trabalho aborda a lipoatrofia facial, que confere um aspecto de envelhecimento precoce e traz de volta o velho estigma da "facies da AIDS", podendo impactar negativamente na qualidade de vida dos portadores de HIV. MÉTODO: Neste estudo foram incluídos 41 pacientes apresentando lipoatrofia facial, que foram submetidos a preenchimento com polimetilmetacrilato (PMMA) no Hospital Universitário da Universidade Federal de Juiz de Fora (HU-UFJF) e na clínica Plastic Center, Clínica de Cirurgia Plástica em Juiz de Fora, no período entre janeiro de 2010 e fevereiro de 2012. RESULTADOS: O número de procedimentos realizados em cada paciente variou de 1 a 4, sendo respeitado um intervalo mínimo de 90 dias entre eles. A quantidade de PMMA utilizado variou de acordo com o grau e a região a serem corrigidos, ficando entre 3 ml e 18 ml por procedimento. Em todos os pacientes, o resultado obtido foi favorável esteticamente. CONCLUSÕES: Os resultados obtidos pela bioplastia com PMMA foram considerados satisfatórios pelos pacientes. O material utilizado possui alta adaptabilidade às áreas receptoras, necessitando apenas da modelagem e da quantidade adequada para que apresente bom padrão estético.


BACKGROUND: When the treatment of acquired immunodeficiency syndrome (AIDS) with highly active antiretroviral therapy (HAART) began in the 1990s, it considerably increased the life expectancy and quality of life of AIDS patients. However, the decrease in morbidity and mortality associated with opportunistic infectious and neoplastic diseases was accompanied by an increase in the prevalence of other diseases, including HIV-associated lipodystrophy. Lipodystrophy is due to the toxicity of drugs used in antiretroviral therapy, including protease inhibitors and nucleoside analog reverse transcriptase inhibitors. This article discusses the treatment of facial lipodystrophy, which confers an appearance of premature aging and brings back the old stigma of the "AIDS face," which negatively impacts the quality of life of HIV carriers. METHODS: Forty-one patients with facial lipoatrophy received filling with polymethylmethacrylate (PMMA) at the Hospital Universitário da Universidade Federal de Juiz de Fora (HU-UFJF) and at the Plastic Center Clinic, Plastic Surgery Clinic in Juiz de Fora between January 2010 and February 2012. RESULTS: Patients received 1 to 4 procedures with a minimum interval of 90 days between procedures. The amount of PMMA used ranged from 3 to 18 mL per procedure according to the degree and region to be corrected. The results were aesthetically favorable in all patients. CONCLUSIONS: The results obtained through bioplasty with PMMA are considered satisfactory by patients. The material used is highly adaptable to the receiving areas, requiring only modeling and an adequate amount in order to obtain good aesthetic results.


Subject(s)
Humans , Male , Female , Middle Aged , Aged , History, 21st Century , Surgery, Plastic , Aging , Acquired Immunodeficiency Syndrome , HIV , Polymethyl Methacrylate , Antiretroviral Therapy, Highly Active , HIV-Associated Lipodystrophy Syndrome , Drug-Related Side Effects and Adverse Reactions , Lipid Metabolism , Face , Lipodystrophy , Surgery, Plastic/methods , Aging/drug effects , Acquired Immunodeficiency Syndrome/drug therapy , Acquired Immunodeficiency Syndrome/therapy , Polymethyl Methacrylate/therapeutic use , Antiretroviral Therapy, Highly Active/methods , HIV-Associated Lipodystrophy Syndrome/surgery , HIV-Associated Lipodystrophy Syndrome/therapy , Drug-Related Side Effects and Adverse Reactions/therapy , Lipid Metabolism/physiology , Face/surgery , Lipodystrophy/surgery , Lipodystrophy/drug therapy
18.
Medwave ; 12(1)ene. 2012.
Article in Spanish | LILACS | ID: lil-714134

ABSTRACT

La cementoplastía en aplastamientos o fracturas vertebrales es un proceder que se utiliza con mayor frecuencia en la sociedad moderna, basado en la inyección percutánea de polimetil-metacrilato. El objetivo de este artículo es presentar una experiencia de nuevo abordaje en el tratamiento del dolor oncológico; en este caso por metástasis en el cuerpo vertebral de S2, a partir de un cáncer de próstata, que refería un dolor incapacitante. Creemos que el proceder fue novedoso y que existen pocos casos reportados en la bibliografía mundial sobre la sacroplastia.


The cementoplasty in squashing or vertebral fractures is an action that is utilized with high frequency in the modern society, based in the percutaneous injection of polimetil-metacrylate. The objective of this presentation is to show you an experience to a new perspective in the treatment of the cancer pain; In this case for metastasis in S2's vertebral body, from a prostate cancer, that presented a crippling pain. That is why we thought the way it was conducted was innovative and there are few cases that have been reported in the worldwide bibliography on the sacroplasty.


Subject(s)
Humans , Male , Aged , Cementoplasty , Pain Management/methods , Spinal Neoplasms/secondary , Spinal Neoplasms/therapy , Sacrum/pathology , Bone Cements/therapeutic use , Pain/etiology , Spinal Neoplasms/complications , Prostatic Neoplasms/pathology , Polymethyl Methacrylate/therapeutic use
19.
Dent. press implantol ; 5(4): 30-36, Oct.-Dec. 2011. ilus
Article in Portuguese | LILACS, BBO | ID: lil-699632

ABSTRACT

O sorriso gengival é uma queixa constante e o seu tratamento emprega desde métodos simples, como o uso da toxina botulínica, até os mais complexos, como a cirurgia ortognática. Este trabalho relata o tratamento do sorriso gengival através da biomodelação bucofacial, que cria um anteparo na região da fossa canina e evita a exposição gengival exagerada ao sorrir, devido à ação ampla do músculo elevador do orbicular da boca.


The gummy smile is a frequent complaint and its treatment ranges from simple methods, such as the use of botulinum toxin, through even the most complex, like orthognathic surgery. This paper reports the treatment of a gummy smile by lip biomodelling, which creates a buffer region in the canine fossa and prevents from excessive gingiva exposure when smiling due to the action of the large muscle originated from the orbicularis oris.


Subject(s)
Humans , Female , Adult , Esthetics, Dental , Gingiva/anatomy & histology , Polymethyl Methacrylate/therapeutic use , Smiling
20.
Rev. bras. cir. plást ; 26(3): 385-389, July-Sept. 2011. ilus
Article in English | LILACS | ID: lil-608193

ABSTRACT

INTRODUCTION: In the present study, the stability and biocompatibility of a 30 percent polymethylmethacrylate (PMMA) filling material implanted in the masseter muscle of rats were investigated according to the cytologic characteristics presented in the graft versus host reaction. METHODS: The study included 20 rats, which were divided into 4 groups: groups I, II, III, and IV corresponded to animals evaluated 7, 14, 45, and 60 days after surgery, respectively. The implant was placed in the right masseter muscle at the level of the mandibular angle. RESULTS: After 7 days, lymphoplasmacytic inflammatory infiltrates, a fibrous capsule, a large number of neutrophils, macrophages, and exudate were observed. The second group (14 days) showed granulation tissue composed of a lymphoplasmacytic inflammatory infiltrate, newly formed vessels, and a fibrous capsule. However, the second group also exhibited regeneration of the muscle fibers, and a decreased number of neutrophils and exudate. After 45 and 60 days, the inflammatory infiltrate decreased in intensity compared to the first 2 groups. CONCLUSIONS: The inflammatory reaction caused by PMMA is transient and does not compromise the function and the shape of the masseter muscle tissue, suggesting that PMMA is biocompatible.


INTRODUÇÃO: Este trabalho busca avaliar, em ratos, a estabilidade e a biocompatibilidade de um material de preenchimento à base de polimetilmetacrilato (PMMA) a 30 por cento implantado no músculo masseter, por meio do padrão, e a organização reacional no tecido receptor. MÉTODO: Foram utilizados 20 ratos, divididos em quatro grupos: grupo I, que correspondeu ao período de 7 dias de pós-operatório; grupo II, de 14 dias; grupo III, de 45 dias; e grupo IV, de 60 dias. O implante foi realizado no músculo masseter direito, na região do ângulo da mandíbula. RESULTADOS: No período de 7 dias, observou-se presença de infiltrado inflamatório linfoplasmocitário, com formação de cápsula fibrosa e presença de grande número de neutrófilos, macrófagos e formação de exsudatos. Em 14 dias, observou-se a formação de um tecido de granulação composto por infiltrado inflamatório linfoplasmocitário, vasos de neoformação e cápsula fibrosa. Porém, nesse tempo experimental, nota-se a regeneração das fibras musculares e a diminuição do número de neutrófilos e exsudatos. Após 45 dias e 60 dias, observou-se, no tecido muscular, diminuição da intensidade do infiltrado inflamatório, comparativamente aos tempos experimentais anteriores. CONCLUSÕES: A reação inflamatória provocada pelo PMMA é transitória e não compromete as funções e o contorno desse tecido muscular, o que sugere que o PMMA é biocompatível.


Subject(s)
Animals , Rats , History, 21st Century , Rats , Biocompatible Materials , Dental Implants , Muscle Fibers, Skeletal , Polymethyl Methacrylate , Inflammation , Mandible , Masseter Muscle , Neutrophils , Rats/anatomy & histology , Rats/immunology , Biocompatible Materials/analysis , Biocompatible Materials/adverse effects , Dental Implants/adverse effects , Dental Implants/veterinary , Muscle Fibers, Skeletal/pathology , Polymethyl Methacrylate/analysis , Polymethyl Methacrylate/therapeutic use , Inflammation/veterinary , Mandible/immunology , Masseter Muscle/anatomy & histology , Masseter Muscle/immunology , Neutrophils/pathology
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