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1.
J Stomatol Oral Maxillofac Surg ; 125(5S2): 101828, 2024 Oct.
Article in English | MEDLINE | ID: mdl-38508394

ABSTRACT

OBJECTIVES: The aim of this study is to presents an experimental method for surgical guide confection using an intraoral scanner to obtain a 3D model of the patient's complete denture and compare its accuracy with the conventional methodology using computed tomography. STUDY DESIGN: This prospective in-vitro study used 30 polyurethane pre-manufactured mandibles which were divided into two groups, conventional technique (group I) and a new method using intraoral scanner (group II), establishing the virtually planned position of the dental implants as a control group, considered as the gold standard for postoperative comparison. RESULTS: The difference between these methods is close to zero and not statistically significant (p > 0.05), being heigh deviation (Xh) with p:0.130 and angulation difference of dental implants between the groups (Ang) with p:0.396. CONCLUSION: The acquisition of stereolithography image of the prosthesis using an intraoral scanner has a clinically acceptable accuracy, being in agreement with the conventional method.


Subject(s)
Dental Implants , Imaging, Three-Dimensional , Mandible , Surgery, Computer-Assisted , Humans , Surgery, Computer-Assisted/methods , Surgery, Computer-Assisted/instrumentation , Prospective Studies , Dental Implants/standards , Imaging, Three-Dimensional/methods , Mandible/surgery , Mandible/diagnostic imaging , Tomography, X-Ray Computed , In Vitro Techniques , Stereolithography/standards , Dental Implantation, Endosseous/methods , Dental Implantation, Endosseous/instrumentation , Dental Implantation, Endosseous/standards , Denture, Complete
2.
Rev. Bras. Ortop. (Online) ; 57(1): 96-102, Jan.-Feb. 2022. tab, graf
Article in English | LILACS | ID: biblio-1365751

ABSTRACT

Abstract Objective The primary aim of the present study was to evaluate the long-term outcomes including survivorship of computer navigated distal femoral lateral opening wedge osteotomy (DFLOWO). The secondary aim was to identify the potential factors that may influence its survivorship. Methods A retrospective analysis of prospectively collected data for patients with lateral compartment arthritis who underwent navigated DFLOWO from December 2006 to November 2012 was performed. The International Knee Documentation Committee (IKDC) and Knee Injury and Osteoarthritis Outcome Score (KOOS) scores were analyzed for outcome measures. Conversion to arthroplasty during the follow-up was the end point. Results A total of 19 DFLOWOs were performed in 17 patients with a mean age of 46.6 ± 6.5 years formed the study cohort. The coronal alignment was corrected from a mean of 7.1° (2-11°) valgus to a mean of 2.1° (0.5°-3°) varus. The IKDC scores improved from mean of 39 preoperatively to 53 at the mean long-term follow-up of 9.1 years. The mean KOOS scores at the long-term follow-up were pain 71, symptoms 56, activities of daily living 82, sports and recreation 59, quality of life 43. Survivorship of the DFLOWO was 78.9% at a follow-up of 9.1 years. Presence of ≥ grade 2 according to the International Cartilage Repair Society (ICRS) cartilage degeneration in the medial compartment of the knee and >7° preoperative valgus deformity were strongly correlated with conversion to total knee arthroplasty (TKA) at the long-term follow-up (r= 0.66). ConclusionsComputer navigated DFLOWO has satisfactory clinical outcomes and 79% survivorship in long-term follow-up. Presence of more than ICRS ≥ grade 2 degenerative changes in the medial compartment of knee with > 7° preoperative valgus deformity negatively affects the survivorship of DFLOWO in the long-term follow-up.


Resumo Objetivo O objetivo principal do presente estudo foi avaliar os resultados a longo prazo, incluindo a sobrevivência em Osteotomia Varizante Femoral Distal com Cunha de Abertura Lateral (OVFD-CAL) utilizando navegação computadorizada. O objetivo principal do presente estudo foi avaliar os resultados a longo prazo, incluindo a sobrevivência. Métodos Foi realizada uma análise retrospectiva dos dados coletados prospectivamente de pacientes com artrite do compartimento lateral submetidos a OVFD-CAL por navegação de dezembro de 2006 a novembro de 2012. As pontuações International Knee Documentation Committee (IKDC, na sigla em inglês) e Knee Injury and Osteoarthritis Outcome Score (KOOS, na sigla em inglês) foram analisadas para medição de resultados. Conversão para artroplastia durante o acompanhamento foi o ponto final. Resultados Um total de 19 OVFD-CAL foram realizados em 17 pacientes com média de idade de 46,6 ± 6,5 anos formaram a coorte do estudo. O alinhamento coronal foi corrigido a partir de uma média de 7,1° (2-11°) de valgo para uma média de 2,1° (0,5°-3°) de varo. As pontuações do IKDC melhoraram de uma média pré-operatória de 39 para 53 no acompanhamento de médio de longo prazo de 9,1 anos. Os escores do KOOS no acompanhamento a longo prazo foram: dor 71, sintomas 56, atividades da vida diária 82, esportes e recreação 59, qualidade de vida 43. A sobrevivência do OVFD-CAL foi de 78,9% em um acompanhamento de 9,1 anos. Presença de degeneração da cartilagem segundo a Sociedade Internacional de Reparação de Cartilagem (International Cartilage Repair Society [ICRS, na sigla em inglês])≥ grau 2 no compartimento medial do joelho e deformidade pré-operatória em valgo > 7° fortemente correlacionado com a conversão para artroplastia total do joelho (ATJ) no acompanhamento a longo prazo (r - 0,66). ConclusõesA OVFD-CAL por navegação computadorizada apresentou resultados clínicos satisfatórios e sobrevida de 79% no acompanhamento a longo prazo. Presença de alterações degenerativas ICRS ≥ grau 2 no compartimento medial do joelho com > 7° de deformidade pré-operatória em valgo afeta negativamente a sobrevivência da OVFD-CAL no acompanhamento de longo prazo.


Subject(s)
Humans , Male , Female , Osteoarthritis , Osteotomy , Outcome Assessment, Health Care , Arthroplasty, Replacement, Knee , Surgery, Computer-Assisted , Knee Injuries
3.
Braz. dent. sci ; 25(4): 1-8, 2022. ilus
Article in English | LILACS, BBO - Dentistry | ID: biblio-1396074

ABSTRACT

Maxillary sinus pneumatisation pose a grave clinical challenge for implant fixed rehabilitation in posterior maxilla owing to diminished bone volume. This necessitates sinus lift and grafting which increase the duration and cost and possible surgical complications. Pterygoid implant has a greater short term osseointegration and is a proven treatment method for rehabilitation of highly resorbed posterior maxilla. To overcome the limitations of sinus grafting techniques, the current case report describes the use of flapless, tilted and pterygoid implant for restoration of partially edentulous atrophic maxilla eliminating grafting (AU).


A pneumatização do seio maxilar representa um grande desafio clínico para a reabilitação fixa por implante na região posterior da maxila devido ao volume ósseo diminuído. Isso requer elevação do seio e enxerto, fatores que aumentam a duração, o custo e as possíveis complicações cirúrgicas. O implante pterigóide tem uma osseointegração maior em curto prazo e é um método de tratamento comprovado para reabilitação de maxila posterior altamente reabsorvida. Para superar as limitações das técnicas de enxerto de seio, o relato de caso atual descreve o uso de implante sem retalho, inclinado e pterigóide para restauração de maxila atrófica parcialmente edêntula eliminando o enxerto.(AU)


Subject(s)
Humans , Middle Aged , Case Reports , Dental Implants , Jaw, Edentulous, Partially , Surgery, Computer-Assisted , Immediate Dental Implant Loading
4.
Clin. biomed. res ; 42(4): 342-347, 2022.
Article in Portuguese | LILACS | ID: biblio-1513205

ABSTRACT

Introdução: Avaliar os níveis de conhecimento, interesse e treinamento dos cirurgiões inscritos no Colégio Brasileiro dos Cirurgiões (CBC) da cidade de Porto Alegre, Rio Grande do Sul, em relação à cirurgia robótica. Métodos: Estudo transversal, baseado em informações coletadas por meio de questionário enviado via plataforma digital para potenciais participantes. O formulário continha perguntas estruturadas e autoaplicáveis, a fim de caracterizar o perfil profissional, capacitação em cirurgia minimamente invasiva, conhecimento, opinião e treinamento específico em cirurgia robótica. Resultados: Dos 146 membros inscritos no CBC na cidade de Porto Alegre, 99 (67,8%) responderam ao questionário. Houve predomínio do sexo masculino (88%) e a mediana de idade dos participantes foi de 48 anos. Os procedimentos videolaparoscópicos ou vídeo-assistidos foram maioria na rotina dos cirurgiões. Da totalidade da amostra, a maior parte (78%) já assistiu ao menos um procedimento robótico, e um terço (n = 30) já realizou algum tipo de treinamento ou simulação em cirurgia robótica. Entre os que não realizaram, dois terços pretendem se qualificar no futuro. Apenas 10% dos cirurgiões possuem certificação na área. Conclusão: A maioria dos cirurgiões respondentes inscritos no CBC em Porto Alegre tem em sua rotina predominância de procedimentos minimamente invasivos e acredita que a plataforma robótica será o futuro da cirurgia. Embora ainda não disponível na maioria dos serviços gaúchos, espera-se que o desenvolvimento de novas plataformas e a redução dos custos envolvidos na aquisição de equipamento e de capacitação do cirurgião facilitem a disseminação dessa tecnologia.


Introduction: To assess the practical knowledge, interest, and training levels of surgeons enrolled in the Brazilian College of Surgeons (CBC) of the municipality of Porto Alegre, Rio Grande do Sul, regarding robotic surgery. Methods: Cross-sectional study, based on information collected with a questionnaire sent to potential participants via digital platform. The form contained structured and self-administered questions, to characterize their professional profile, skills in minimally invasive surgery, knowledge, opinion, and specific training in robotic surgery. Results: Of the 146 members enrolled in the CBC of the municipality of Porto Alegre, 99 (67.8%) responded to the questionnaire. Most were males (88%) with a mean age of 48 years. Video-laparoscopic or video-assisted procedures were the most frequent in the participants' practice. Of the sample, most (78%) already watched at least one robotic surgery, and one third (n = 30) had already completed some sort of training or simulation course in robotic surgery. Among those who did not, two thirds intend to pursue formal training in the future. Only 10% of participating surgeons are certified in the area. Conclusion: Most responding surgeons enrolled in the CBC in Porto Alegre perform mostly minimally invasive procedures daily and believe that the robotic technology will be the future of surgery. Although not yet available in most services of the state of Rio Grande do Sul, it is expected that the development of new platforms and the reduction of costs involved in equipment acquisition and surgical training will facilitate the dissemination of this technology.


Subject(s)
Robotic Surgical Procedures/education , Surgeons , Cross-Sectional Studies , Clinical Competence , Simulation Training
5.
J Obstet Gynaecol Can ; 43(7): 879-883, 2021 07.
Article in English | MEDLINE | ID: mdl-33301954

ABSTRACT

BACKGROUND: Congenital high airway obstruction syndrome (CHAOS) involves the partial or complete obstruction of the fetal upper airways, usually caused by atresia or stenosis of the larynx or trachea. The obstruction of bronchial tree leads to lung distension, diaphragmatic eversion, and cardiac dysfunction, which can result in fetal death. CASE: A primigravid 19-year-old was diagnosed with CHAOS at 193 weeks gestation. Virtual navigation using magnetic resonance imaging (MRI) data was used to visualize the fetal airways after intrauterine endoscopic laser decompression. A perforation in the fetal larynx/trachea was identified and the diagnosis was modified to tracheal stenosis. Cesarean delivery occurred at 315 weeks using an ex utero intrapartum treatment (EXIT) procedure. The neonatology team were unable to perform intubation, suggesting a final diagnosis of tracheal atresia. The male newborn weighed 1920 g and died 1 hour later. CONCLUSION: 3D virtual bronchoscopy is a non-invasive approach to visualizing the fetal upper airways and can be used to diagnose and manage CHAOS.


Subject(s)
Airway Obstruction , Fetal Diseases , Larynx , Adult , Airway Obstruction/diagnostic imaging , Airway Obstruction/etiology , Airway Obstruction/surgery , Female , Humans , Infant, Newborn , Larynx/diagnostic imaging , Larynx/surgery , Male , Pregnancy , Trachea/diagnostic imaging , Trachea/surgery , Ultrasonography, Prenatal , Young Adult
6.
Rev. bras. cir. cardiovasc ; Rev. bras. cir. cardiovasc;33(5): 443-447, Sept.-Oct. 2018. tab, graf
Article in English | LILACS | ID: biblio-977454

ABSTRACT

Abstract Introduction: Various surgical procedures for minimally invasive cardiac surgery have been described in recent decades as alternatives to median sternotomy. Cardiopulmonary bypass via femoral arterial and venous cannulation is the foundation of these procedures. In this study, we evaluated the mid-term outcomes of femoral cannulation performed with U-suture technique in patients undergoing robotic heart surgery. Methods: A total of 216 patients underwent robotic-assisted cardiac surgery between January 2013 and April 2017. Cardiopulmonary bypass was performed via femoral artery, jugular, and femoral vein cannulation, and a Chitwood clamp was used for aortic occlusion. A total of 192 patients attended the outpatient follow-up, and femoral arterial and venous flow pattern was examined using Doppler ultrasound (DUS) in 145 patients. Results: Hospital mortality occured in 4 of the 216 (1.85%) cases, but there was no late mortality in this patient group. Postoperatively, seroma (n=9, 4.69%) and cannulation site infection (n=3, 1.56%) were managed with outpatient treatment. DUS in 145 patients revealed triphasic flow pattern in the common femoral arteries in all patients except for 2 (1.38%). These patients were determined to have asymptomatic arterial stenosis. Chronic recanalized thrombus in the common femoral vein was also detected in 2 (1.38%) patients. Conclusion: Femoral artery cannulation with the U-suture technique can be successfully performed in robotic-assisted cardiac surgery, with good mid-term results.


Subject(s)
Humans , Male , Female , Adult , Arterial Occlusive Diseases/surgery , Cardiopulmonary Bypass/methods , Robotic Surgical Procedures , Blood Flow Velocity , Cardiopulmonary Bypass/adverse effects , Follow-Up Studies , Treatment Outcome , Minimally Invasive Surgical Procedures , Femoral Artery , Femoral Vein
7.
Arch Plast Surg ; 45(3): 284-288, 2018 May.
Article in English | MEDLINE | ID: mdl-29788686

ABSTRACT

Dynamic infrared thermography (DIRT) has been used for the preoperative mapping of cutaneous perforators. This technique has shown a positive correlation with intraoperative findings. Our aim was to evaluate the accuracy of perforator mapping with DIRT and augmented reality using a portable projector. For this purpose, three volunteers had both of their anterolateral thighs assessed for the presence and location of cutaneous perforators using DIRT. The obtained image of these "hotspots" was projected back onto the thigh and the presence of Doppler signals within a 10-cm diameter from the midpoint between the lateral patella and the anterior superior iliac spine was assessed using a handheld Doppler device. Hotspots were identified in all six anterolateral thighs and were successfully projected onto the skin. The median number of perforators identified within the area of interest was 5 (range, 3-8) and the median time needed to identify them was 3.5 minutes (range, 3.3-4.0 minutes). Every hotspot was correlated to a Doppler sound signal. In conclusion, augmented reality can be a reliable method for transferring the location of perforators identified by DIRT onto the thigh, facilitating its assessment and yielding a reliable map of potential perforators for flap raising.

8.
Acta Ortop Bras ; 25(2): 103-106, 2017.
Article in English | MEDLINE | ID: mdl-28642661

ABSTRACT

OBJECTIVE: To prove the accuracy of a customized guide developed according to our method. METHODS: This customized guide was developed from a three-dimensional model of proximal femur reconstructed using computed tomography data. Based on the new technique, the position of the guide pin insertion was selected and adjusted using the reference of the anatomical femoral neck axis. The customized guide consists of a hemispheric covering designed to fit the posterior part of the femoral neck. The performance of the customized guide was tested in eight patients scheduled for total hip arthroplasty. The stability of the customized guide was assessed by orthopedic surgeons. An intraoperative image intensifier was used to assess the accuracy. RESULTS: The customized guide was stabilized with full contact and was fixed in place in all patients. The mean angular deviations in relation to the what was planned in anteroposterior and lateral hip radiographs were 0.5º ± 1.8º in valgus and 1.0º ± 2.4º in retroversion, respectively. CONCLUSION: From this pilot test, the authors suggest that the proposed technique could be applied as a customized guide to the positioning device for hip resurfacing arthroplasty with acceptable accuracy and user-friendly interface. Level of Evidence IV, Cases Series.


OBJETIVO: Comprovar a precisão de uma guia personalizada desenvolvida a partir de nosso método. MÉTODOS: Esta guia personalizada foi desenvolvida a partir do modelo tridimensional da parte proximal do fêmur reconstruída usando dados de tomografia computadorizada. Com base na nova técnica, a posição de inserção do pino da guia foi selecionada e ajustada usando a referência do eixo anatômico do colo do fêmur. A guia personalizada consiste em um revestimento hemisférico projetado para encaixar na parte posterior do colo do fêmur. O desempenho da guia personalizada foi testado em oito pacientes que seriam submetidos à artroplastia total do quadril. A estabilidade da guia personalizada foi avaliada por cirurgiões ortopedistas. Para avaliar a precisão, usou-se um intensificador de imagem intraoperatório. RESULTADOS: A guia personalizada foi estabilizada com contato total e foi fixada em todos os pacientes. Os desvios angulares médios com relação ao planejado nas radiografias anteroposteriores e laterais do quadril foram de 0,5º ± 1,8º em valgo e 1,0º ± 2,4º em retroversão, respectivamente. CONCLUSÃO: A partir deste teste piloto, os autores sugerem que a técnica proposta poderia ser aplicada como guia personalizada para o dispositivo de posicionamento para resurfacing em artroplastia de quadril com aceitável precisão e interface amigável. Nível de Evidência IV, Série de Casos .

9.
Acta ortop. bras ; Acta ortop. bras;25(2): 103-106, Mar.-Apr. 2017. tab, graf
Article in English | LILACS | ID: biblio-837747

ABSTRACT

ABSTRACT Objective: To prove the accuracy of a customized guide developed according to our method. Methods: This customized guide was developed from a three-dimensional model of proximal femur reconstructed using computed tomography data. Based on the new technique, the position of the guide pin insertion was selected and adjusted using the reference of the anatomical femoral neck axis. The customized guide consists of a hemispheric covering designed to fit the posterior part of the femoral neck. The performance of the customized guide was tested in eight patients scheduled for total hip arthroplasty. The stability of the customized guide was assessed by orthopedic surgeons. An intraoperative image intensifier was used to assess the accuracy. Results: The customized guide was stabilized with full contact and was fixed in place in all patients. The mean angular deviations in relation to the what was planned in anteroposterior and lateral hip radiographs were 0.5º ± 1.8º in valgus and 1.0º ± 2.4º in retroversion, respectively. Conclusion: From this pilot test, the authors suggest that the proposed technique could be applied as a customized guide to the positioning device for hip resurfacing arthroplasty with acceptable accuracy and user-friendly interface. Level of Evidence IV, Cases Series.


RESUMO Objetivo: Comprovar a precisão de uma guia personalizada desenvolvida a partir de nosso método. Métodos: Esta guia personalizada foi desenvolvida a partir do modelo tridimensional da parte proximal do fêmur reconstruída usando dados de tomografia computadorizada. Com base na nova técnica, a posição de inserção do pino da guia foi selecionada e ajustada usando a referência do eixo anatômico do colo do fêmur. A guia personalizada consiste em um revestimento hemisférico projetado para encaixar na parte posterior do colo do fêmur. O desempenho da guia personalizada foi testado em oito pacientes que seriam submetidos à artroplastia total do quadril. A estabilidade da guia personalizada foi avaliada por cirurgiões ortopedistas. Para avaliar a precisão, usou-se um intensificador de imagem intraoperatório. Resultados: A guia personalizada foi estabilizada com contato total e foi fixada em todos os pacientes. Os desvios angulares médios com relação ao planejado nas radiografias anteroposteriores e laterais do quadril foram de 0,5º ± 1,8º em valgo e 1,0º ± 2,4º em retroversão, respectivamente. Conclusão: A partir deste teste piloto, os autores sugerem que a técnica proposta poderia ser aplicada como guia personalizada para o dispositivo de posicionamento para resurfacing em artroplastia de quadril com aceitável precisão e interface amigável. Nível de Evidência IV, Série de Casos .

10.
Full dent. sci ; 8(31): 59-65, 2017.
Article in Portuguese | BBO - Dentistry | ID: biblio-910357

ABSTRACT

O planejamento virtual para cirurgia guiada é uma técnica que vem sendo cada vez mais utilizada na Implantodontia. Sendo assim, o objetivo desse estudo foi realizar uma revisão da literatura sobre a técnica de planejamento virtual para cirurgia guiada sem retalho em reabilitação oral com implantes osseointegráveis, de modo a fornecer informação sobre as características, vantagens e limitações dessa modalidade. Diversos estudos demonstraram a confiabilidade e vantagens da técnica quanto à precisão do planejamento, inserção dos implantes, fabricação da prótese e satisfação do paciente. No entanto, alguns autores relataram que desvios podem ocorrer quanto ao posicionamento dos implantes em relação ao planejamento virtual, o que ressalta a importância da utilização do guia cirúrgico, bem como precisão durante a execução de todas as etapas clínicas e laboratoriais. Concluiu-se que, apesar das limitações relatadas por alguns autores, o método apresenta diversas vantagens que garantem a sua previsibilidade quando indicado e executado corretamente (AU).


The virtual planning for guided surgery has been a widely used technique in Implantology. Thus, the aim of this study was to conduct a literatura review about the virtual planning for flapless guided surgery in oral rehabilitation with dental implants regarding its characteristics, advantages, and limitations. Several studies demonstrated the reliability and advantages of this approach as a consequence of accuracy during treatment planning, implants insertion, prosthesis fabrication, and patient's satisfaction. However, some authors reported deviations of implants positioning compared to the virtual planning, which highlighted the importance of using the surgical guide as well as the accuracy during all clinical and laboratorial steps. Despite of the limitations demonstrated by some authors, it was concluded that this method presents several advantages to enhance its predictability when the procedures are well indicated and performed (AU).


Subject(s)
Dental Implants , Dental Prosthesis Design/methods , Surgery, Computer-Assisted , Surgery, Computer-Assisted/instrumentation , Brazil , Tomography, X-Ray Computed/instrumentation , Mouth Rehabilitation
11.
Rio de janeiro; s.n; 2017. 135 p. ilus.
Thesis in Portuguese | BBO - Dentistry , LILACS | ID: biblio-1008772

ABSTRACT

O sucesso da cirurgia ortognática depende da técnica cirúrgica e da acurácia do planejamento. O planejamento em cirurgia ortognática tem evoluído muito nas últimas duas décadas, especialmente em relação ao desenvolvimento do planejamento cirúrgico virtual tridimensional. O objetivo deste estudo foi avaliar, através de metodologia tridimensional, a acurácia do planejamento cirúrgico virtual realizado pelo programa Dolphin Imaging®. A amostra do trabalho foi composta por 10 indivíduos, de ambos os sexos, sem crescimento, portadores de má oclusões de Classe II ou classe III, que necessitassem de cirurgia bimaxilar mais mentoplastia, para correção da deformidade, acompanhados de forma prospectiva. Todos os pacientes foram operados pela equipe de cirurgia bucomaxilofacial do Hospital Universitário Pedro Ernesto. A documentação dos pacientes era composta por tomografia computadorizada de feixe cônico (CBCT), modelos das arcadas e fotografias pré-operatórias e CBCT pós-operatória. Os planejamentos virtuais foram realizados pelo módulo cirúrgico do programa e transferidos para o momento da cirurgia, através de uma goteira interoclusal obtido por prototipagem. A acurácia foi avaliada com o uso dos programas ITK-Snap 3.6, Geomagic Qualify® 2013 e MeshValmet® 3.0. Foram feitas avaliações para a diferença entre o planejamento virtual e o obtido na cirurgia real em relação à superfície dos segmentos, com avaliação utilizando o valor de Root Mean Square (RMS) do deslocamento de cada fragmento, e em relação aos deslocamentos translacionais das regiões anatômicas de interesse, medidos através do cálculo do deslocamento tridimensional dos centroides das estruturas avaliadas. Os dados das distâncias entre superfícies, considerando o RMS, foram realizados pelo teste de Wilcoxon para uma amostra. Os dados da diferença de posicionamento entre os centroides foram calculados pelo teste t, pareado e complementados pelo método de Altman-Bland e por gráficos de Concordância-sobrevivência. Os resultados mostraram que houve diferença estatisticamente significativa em relação à avaliação da distância entre as superfícies para o posicionamento da mandíbula (p=0,013) e do mento (p=0,013) e em relação ao posicionamento dos centroides na direção transversal do ramo direito (p=0,034), quando considerado o sentido do deslocamento, e na direção vertical dos ramos direito (p=0,005) e esquerdo (p=0,025), quando não considerado o sentido do deslocamento. Em relação à medida de relevância clínica aceitável, comumente considerada de 2mm, observou-se acurácia para os segmentos da maxila, proximais (ramos) e distais (corpo) da mandíbula, mas não observou-se para o segmento do mento. Concluiu-se que o planejamento cirúrgico virtual, realizado pelo módulo cirúrgico do Dolphin Imaging®, apresenta boa acurácia para determinar o posicionamento dos segmentos da maxila, ramos e corpo mandibular, mas não pode ser considerado como tendo adequada acurácia para o posicionamento do mento sem uso de posicionador específico.


The success of orthognathic surgery depends on the surgical technique and on the accuracy of its planning. Planning in orthognathic surgery has evolved over the last two decades especially due to the development of three-dimensional virtual surgical planning. The objective of this study was to assess the accuracy of virtual surgical planning performed by the Dolphin Imaging© software through a three-dimensional methodology. The sample consisted of 10 individuals of both genders, after the growth period, with Class II or Class III malocclusions, requiring bimaxillary surgery and genioplasty. Those patients were followed up prospectively. The maxillofacial surgery staff of Pedro Ernesto University Hospital conducted all surgeries. Patient documentation consisted of preoperative cone beam computed tomography (CBCT), plaster models of upper and lower arches, photographs, and postoperative CBCT. The virtual planning were performed with the surgical module of the software. A prototyped interocclusal splint was used to transfer the digital planning to the real surgery. The accuracy was tested using the softwares ITK-Snap 3.6, Geomagic Qualify 2013© and MeshValmet 3.0. The difference between the virtual planning and actual surgery was calculated for the segments, using the root mean square (RMS) value of displacement of each individual fragment, and the translational displacements of the anatomical regions of interest (ROI) were measured through the three-dimensional displacement of the 3D centroid of each model. The data of the distances between surfaces considering RMS was analyzed by the Wilcoxon rank test. The data of differences between the centroids positions was calculated by the paired t-test and complemented by the Altman-Bland method and the Survival Agreement. The results showed that the distance between the surfaces were significantly different when considering the mandible position (p = 0.013) and the chin (p = 0.013). According to the position of the centroids it was found significant difference in the transverse direction of the right ramus (p = 0.034) when the direction of the displacement was taken into account and in the vertical direction of the right ramus (p = 0.005) and left ramus (p = 0.025) when the direction of the displacement was not considered. Considering a clinical relevance threshold of 2mm, it can be assumed that the segments of the maxilla, proximal (ramus) and distal (body) of the mandible were accurate, but the chin segment was not. It was concluded that the virtual surgical planning performed by the Dolphin Imaging© surgical module is accurate to determine the positioning of the maxilla, ramus and mandibular body segments, but can not be considered as having adequate accuracy for the positioning of the chin without the use of a specific positioner


Subject(s)
Humans , Male , Female , Adult , Young Adult , Software Validation , Computer-Aided Design , Imaging, Three-Dimensional , Surgery, Computer-Assisted , Orthognathic Surgical Procedures/methods , Malocclusion/surgery , Data Accuracy
12.
ImplantNewsPerio ; 1(7): 1310-1318, out.-nov. 2016. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: biblio-847941

ABSTRACT

Objetivo: este estudo foi idealizado com a finalidade de comparar as posições dos análogos em modelos de gesso, obtidos antes e após o procedimento cirúrgico de instalação dos implantes, em dez casos clínicos. Material e métodos: foram selecionados dez guias prototipados de maxilas edêntulas, que já haviam sido utilizados para a instalação guiada de implantes e que já estavam com as próteses instaladas. Cilindros posicionadores de análogos de minipilar foram adaptados para obtenção dos modelos de gesso pré-cirúrgicos (modelo 1). Também foram reunidos os modelos dos casos que haviam sido obtidos através da moldagem realizada em boca após a instalação dos intermediários (modelo 2). Todos foram submetidos a escaneamento a laser, e a comparação entre os modelos foi realizada virtualmente com um software específico. Os dados foram analisados estatisticamente utilizando o teste de Wilcoxon (p < 0,05). Resultados: foi encontrada uma média de desvio angular de 3,17o ± 1,78o (p=0,000). A média do desvio angular encontrada na comparação entre os dois modelos avaliados foi semelhante a desvios encontrados na literatura. Conclusão: técnicas como a da adaptação passiva devem ser utilizadas com o objetivo de compensar tais desvios e facilitar o procedimento técnico laboratorial, entregando a prótese final em menos tempo.


Objective: this study compared the positions of the analogs in plaster models obtained before and after implant placement in 10 clinical cases. Material and methods: ten CAD/CAM surgical guides for maxillary edentulous patients were selected and which had already been used for the guided implant placement and with the final prosthesis already fabricated. To generate the pre-surgical cast model (model 1), mini conical replicas were mounted on the guiding sleeves using cylinder positioners. The models obtained through an impression after the surgical procedures were also analyzed (model 2). Each plaster model was subjected to laser scanning and the comparison between models was performed in specialized software. The statistical analyses were performed using Wilcoxon test (p < 0.05). Results: a mean angular deviation of 3.17o ± 1.8o (p=0.000) was found. The average angular deviation found in the comparison between the two models evaluated was similar to deviations in the literature. Conclusion: techniques such as passive adaptation, must be used in order to compensate the deviations and improve laboratory procedures, speeding the final denture delivery in less time.


Subject(s)
Humans , Computer-Aided Design , Dental Implants , Imaging, Three-Dimensional , Surgery, Computer-Assisted , Tomography, X-Ray Computed
13.
J. health inform ; 8(supl.I): 981-988, 2016. ilus, tab
Article in Portuguese | LILACS | ID: biblio-906743

ABSTRACT

OBJETIVO: O presente trabalho busca o desenvolvimento de uma solução de tecnologia que possa auxiliar o tratamento e edição de imagens para um planejamento semiautomatizado de tratamento de dentes caninos inclusos. MÉTODOS: Para isto foi verificado no âmbito do LT3D/NUTES casos clínicos de dentes caninos inclusos e requisitos de um biomodelo para melhor apoiar o planejamento e execução do tratamento ortodôntico. De posse dos requisitos, foram feitas análises em dez softwares de modelagem tridimensional visando identificar o cumprimento das tarefas elencadas como essenciais para a simulação do tratamento supracitado. RESULTADO: Resumo da análise dos softwares contendo as combinações de funcionalidades que permitem o auxílio no planejamento do tratamento.


OBJECTIVE: This work aims to develope technology solution that makes use of image treatment and editing software tools to support a semi-automated treatment planning of impacted canine teeth. METHODS: For this purpose clinical cases of canine teeth in the LT3D / NUTES were studied and a set of requirements were defined for a biomodel to better support the planning and execution of orthodontic treatment. Based on the requirements, ten 3D design software tool were analysed to verify the fulfillment of the set of tasks (requirements) listed as essential to simulate the orthodontic treatment. RESULTS: We provide a summarized analysis of the software studied containing combinations of features that make the semi-automated treatment planning possible.


Subject(s)
Humans , Oral Surgical Procedures , Surgery, Computer-Assisted , Printing, Three-Dimensional , Congresses as Topic
14.
Coluna/Columna ; 14(3): 181-185, July-Sept. 2015. tab, graf
Article in English | LILACS | ID: lil-762974

ABSTRACT

Objectives: To evaluate the accuracy and the operative complications of implanting pedicle screws in the thoracic and lumbar spine, using computer-assisted surgery compared to the implantation technique using fluoroscopy. Methods: A retrospective study was conducted at the Hospital Universitário Cajuru PUC-PR from January 2000 to January 2009. Two groups of patients undergoing implant pedicle screws were analyzed (n=80). Group I received implant pedicle screws through fluoroscopy technique and group II, through neuronavigation technique. The accuracy of positioning of pedicle screws was evaluated using rating scales. Results: The accuracy was higher in group II, where 77.5% of the screws were correctly positioned, whereas there were only 28.5% in group I (p=0.001). There was a reduction of 95% (CI: 80-97%) in the risk of screws misplacement in group II. The average operation time was 312.2±78.1 minutes in group I and 270.3±41.4 in group II (p=0.004). Blood transfusion was needed in 28 patients in group I and 10 patients in group II (p=0.005), resulting in 64% risk reduction of blood transfusion in group II. Eight patients in group I underwent revision surgery whereas only one patient in the group II, that is, 75% of surgical revision risk reduction. Conclusion: The implantation technique of pedicle screws using neuronavigation is a more accurate method and has less operative complications compared with the technique that uses fluoroscopy.


Objetivos: Avaliar a precisão e as complicações operatórias do implante de parafusos pediculares na coluna torácica e lombar, utilizando o método de cirurgia assistida por computação comparada à técnica de implante utilizando fluoroscopia. Métodos: Um estudo retrospectivo foi realizado no Hospital Universitário Cajuru PUC/PR de janeiro de 2000 a janeiro de 2009. Dois grupos de pacientes submetidos a implante de parafusos pediculares foram analisados (n = 80). O grupo I recebeu implante de parafusos pediculares com técnica de fluoroscopia e o grupo II, com técnica de neuronavegação. A precisão dos parafusos pediculares foi avaliada utilizando-se escalas de graduação. Resultados: A precisão do posicionamento dos parafusos foi superior no grupo II, no qual 77,5% dos parafusos estavam corretamente posicionados, enquanto havia somente 28,5% no grupo I (p = 0,001). Houve 95% (IC: 80-97%) de redução do risco de mau posicionamento de parafusos no grupo II. A média de tempo cirúrgico foi de 312,2 ± 78,1 minutos no grupo I e 270,3 ± 41,4 no grupo II (p = 0,004). Houve necessidade de transfusão sanguínea em 28 pacientes do grupo I e em somente 10 no grupo II (p = 0,005), resultando em 64% de redução de risco de transfusão sanguínea no grupo II. Oito pacientes no grupo I foram submetidos à revisão da cirurgia enquanto somente um no grupo II, ou seja, 75% de redução de risco de revisão cirúrgica. Conclusão: A técnica de implante de parafusos pediculares utilizando neuronavegação é um método mais preciso e tem menor complicações operatórias quando comparada com a técnica que utiliza a fluoroscopia.


Objetivos: Evaluar la precisión y las complicaciones operatorias de la implantación de tornillos pediculares en la columna torácica y lumbar, utilizando el método de cirugía asistida por computación en comparación con la técnica de implantación mediante fluoroscopía. Métodos: Un estudio retrospectivo se llevó a cabo en el Hospital Universitário Cajuru PUC-PR desde enero de 2000 a enero de 2009. Se analizaron dos grupos de pacientes sometidos a implante de tornillos pediculares (n = 80). El grupo I ha recibido implantación de tornillos pediculares con la técnica fluoroscópica y el grupo II, con la técnica de neuronavegación. La exactitud de la colocación de los tornillos pediculares se evaluó mediante escalas de clasificación. Resultados: La precisión de la colocación de los tornillos fue mayor en el grupo II, en el que 77,5% de los tornillos fueron correctamente colocados, mientras que sólo había 28,5% en el grupo I (p = 0, 001). Hubo 95% (IC: 80-97%) de reducción en el riesgo de mala posición de tornillos en el grupo II. El tiempo quirúrgico promedio fue de 312,2 ± 78,1 minutos en el grupo I y 270,3 ± 41,4 en el grupo II (p = 0,004). Hubo necesidad de transfusión de sangre en 28 pacientes del grupo I y sólo 10 en grupo II (p = 0, 005), lo que resulta en la reducción del riesgo del 64% de las transfusiones de sangre en el grupo II. Ocho pacientes del grupo I se sometieron a cirugía de revisión, mientras que sólo un paciente en el grupo II, es decir, el 75% de reducción del riesgo de revisión quirúrgica. Conclusión: La técnica de implantación de tornillos pediculares utilizando neuronavegación es un método preciso y tiene menos complicaciones operatorias en comparación con la técnica que utiliza la fluoroscopía.


Subject(s)
Humans , Spine/surgery , Fluoroscopy , Surgery, Computer-Assisted , Pedicle Screws
15.
Acta cir. bras ; Acta cir. bras;28(9): 683-690, Sept. 2013. ilus
Article in English | LILACS | ID: lil-684444

ABSTRACT

PURPOSE: To evaluate the efficacy of associating techniques of bone grafting in the maxillary sinus with the use of a prototyped surgical guide for planning and positioning dental implants in total edentulous maxillae, rehabilitated after six months. METHODS: Eight patients consecutives with totally edentulous maxilla presenting few remaining bone in the posterior alveolar ridge, associated with pneumatization of the maxillary sinus were selected. Twenty eight Brånemark RP 10mm implants were installed in 14 maxillary sinuses. The surgical planning for the implant installation was performed with the DentalSlice software by means of a computerized tomography. The obtained images were used for building a surgical guide that, placed over the maxilla, showed the exact position for the implants installation (prototyped surgical guide). The portion of the implants that went into the maxillary sinus was covered by an autogenous bone graft. RESULTS: The patients were re-evaluated six months after the surgery and a 100% success rate was achieved. All of the implants presented no mobility or symptoms, permitting an oral rehabilitation with total fixed screw-retained prosthesis over the implants. CONCLUSION: The technique of associating implants and bone graft in the maxillary sinus aided by a prototyped guide planned on DentalSlice has showed itself efficient for positioning implants and for quantifying and locating the bone graft.


Subject(s)
Aged , Female , Humans , Male , Middle Aged , Bone Transplantation/methods , Computer-Aided Design , Dental Implants , Dental Implantation, Endosseous/methods , Maxillary Sinus/surgery , Computer Simulation , Dental Prosthesis Design , Dimensional Measurement Accuracy , Jaw, Edentulous/rehabilitation , Maxillary Sinus , Reproducibility of Results , Tomography, X-Ray Computed , Treatment Outcome
16.
Acta cir. bras. ; 28(9): 683-690, Sept. 2013. ilus
Article in English | VETINDEX | ID: vti-9034

ABSTRACT

PURPOSE: To evaluate the efficacy of associating techniques of bone grafting in the maxillary sinus with the use of a prototyped surgical guide for planning and positioning dental implants in total edentulous maxillae, rehabilitated after six months. METHODS: Eight patients consecutives with totally edentulous maxilla presenting few remaining bone in the posterior alveolar ridge, associated with pneumatization of the maxillary sinus were selected. Twenty eight Brånemark RP 10mm implants were installed in 14 maxillary sinuses. The surgical planning for the implant installation was performed with the DentalSlice software by means of a computerized tomography. The obtained images were used for building a surgical guide that, placed over the maxilla, showed the exact position for the implants installation (prototyped surgical guide). The portion of the implants that went into the maxillary sinus was covered by an autogenous bone graft. RESULTS: The patients were re-evaluated six months after the surgery and a 100% success rate was achieved. All of the implants presented no mobility or symptoms, permitting an oral rehabilitation with total fixed screw-retained prosthesis over the implants. CONCLUSION: The technique of associating implants and bone graft in the maxillary sinus aided by a prototyped guide planned on DentalSlice has showed itself efficient for positioning implants and for quantifying and locating the bone graft.(AU)


Subject(s)
Humans , Animals , Maxillofacial Prosthesis Implantation , Bone and Bones/anatomy & histology , Metal-on-Metal Joint Prostheses
17.
Periodontia ; 23(3): 53-57, 2013. tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: biblio-853521

ABSTRACT

Na tentativa de preservação dos tecidos mole e duro, a implantodontia tem optado por uma abordagem cirúrgica sem retalho (técnica flapless). Essa técnica minimamente invasiva destaca-se por suas vantagens como menor sangramento durante a cirurgia, menor tempo cirúrgico e melhor pós-operatório para o paciente. Diante disto, o objetivo desta revisão de literatura é trazer informações sobre o comportamento dos tecidos Peri-implantares nas reabilitações implantossuportadas bem como comparar as técnicas cirúrgicas com e sem retalho. Realizou-se uma busca na base de dados Pubmed/Medline e foram incluídos na revisão estudos clínicos controlados que apresentaram relevância clínica publicados no período de 2008 a 2013. De acordo com os resultados, pode-se observar que a técnica sem retalho proporciona a manutenção da mucosa peri-implantar ao redor dos implantes. Entretanto, não existe diferença significativa quanto à perda óssea entre as técnicas estudadas. Além disso, ambas apresentaram previsibilidade nos resultados do tratamento com implantes. Pode-se concluir que não existem estudos clínicos controlados em longo prazo suficientes quanto à utilização da técnica flapless, entratanto, os resultados em curto prazo sugerem que é uma técnica previsível


In an attempt to preserve the soft and hard tissues, implant dentistry has opted for a flapless surgical approach (flapless technique). This minimally invasive technique is distinguished by its advantages such as less bleeding during surgery, shorter operative time and best postoperative for the patient. Hence, the purpose of this literature review is to provide information about the behavior of the peri-implant tissues in implant restorations and to compare surgical techniques with and without flaps. A search was conducted in the database PubMed/Medline and controlled clinical trials that showed clinical relevance published in the period 2008-2013 were included in this review. According to the results, it could be observed that the flapless surgical approach provides maintenance of the peri-implant mucosa around implants. However, no significant difference in bone loss between techniques was also observed. Besides that, both techniques, with or without flaps, showed predictability in the results of implant treatment. It can be concluded that there are not enough controlled clinical studies regarding the long term use of flapless technique. However, short term results suggest that it is a predictable technique


Subject(s)
Surgery, Computer-Assisted , Surgery, Plastic , Dental Implantation , Periodontics
18.
Rev Bras Ortop ; 47(3): 359-62, 2012.
Article in English | MEDLINE | ID: mdl-27042647

ABSTRACT

OBJECTIVE: The postoperative mechanical axis in 36 cases of total knee arthroplasty using navigated and mechanical alignment systems was evaluated and compared. All the operations were performed over the same period by the same surgeon and team, who were beginners in the navigated technique and experienced in the mechanical technique. METHODS: Between 2008 and 2010, 36 total knee prostheses were performed and compared: 25 navigated and 11 mechanical procedures. Any deviation from the axis measured on the panoramic postoperative X-ray was considered positive. RESULTS: The navigated prostheses produced a mean axis deviation of 1.32 degrees and standard deviation of 1.57 degrees and the mechanical, respectively 3.18 and 2.99 degrees. There was better alignment with a tendency towards a statistical difference favoring the navigated technique. CONCLUSION: There were significantly more cases with axis deviation greater than three degrees using the mechanical technique. The navigated technique was incorporated by this team without additional complications and, even without experience of navigated surgery, the initial cases achieved better alignment than with the mechanical technique, and a significantly smaller number of outliers from the three-degree safety zone.

19.
Acta ortop. bras ; Acta ortop. bras;19(4): 184-188, 2011. ilus, graf
Article in Portuguese | LILACS | ID: lil-601824

ABSTRACT

OBJETIVO: Avaliar se a cirurgia auxiliada por navegação oferece vantagens sobre a técnica convencional, foi desenvolvido um estudo randômico, prospectivo e comparativo analisando o posicionamento do implante, alinhamento do membro, tempo de cirurgia, perda sanguínea e reabilitação funcional. MÉTODOS: Foram estudados 39 pacientes submetidos a 42 Artroplastias Totais de Joelho. No grupo 1 (n=21) a cirurgia foi navegada e no grupo 2 (n=21) convencional. Os pacientes foram avaliados com radiografia panorâmica de membros inferiores, tomografia computadorizada e pelo Knee Society Score (KSS) no pré-operatório e com três meses de pós-operatório. O tempo de cirurgia e a perda sanguínea pós-operatória também foram avaliados. RESULTADOS: O tempo de cirurgia foi maior no grupo 1. Não houve diferença significativa quanto à perda sanguínea e ao KSS. Houve maior proximidade dos três graus de rotação externa e dos cinco graus de inclinação coronal nos pacientes do grupo 2. O eixo mecânico aproximou-se mais de zero grau no grupo 1. CONCLUSÕES: A navegação promove um posicionamento individualizado dos componentes da prótese oferecendo vantagens no realinhamento do membro. O tempo cirúrgico tende a ser maior na técnica navegada, porém, não foi estatisticamente significante. Não há diferenças na perda sanguínea e na melhora do KSS. Nivel de Evidência I, estudo terapeutico.


OBJECTIVE: Aiming to evaluate whether surgery aided navigation offers any advantages over the conventional technique, a randomized, prospective, comparative study was carried out, analyzing the placement of components, alignment of the limb, surgical time, blood loss and functional rehabilitation. MATERIAL AND METHODS: We studied 39 patients submitted42 Total Knee Arthroplasties. In group 1 (n = 21) the surgery was navigated and in group 2 (n = 21) it was conventional. The patients were evaluated on panoramic radiographs of the lower limbs, CT scan and the Knee Society Score (KSS) preoperatively and three months postoperatively. Surgery time and postoperative blood loss were also evaluated. RESULTS: Surgery time was longer in group 1. There was no significant difference in blood loss and the KSS. There was a greater proximity of the three degrees of external rotation and the five degrees of tilt in the coronal in group 2. The mechanical axis was closer to zero degree in group CONCLUSIONS: Navigation promotes individualizing of the positioning of the components of the prosthesis, and offered advantages in limb realignment, compared with traditional methods. The surgerytime has a tendency to be higher in group 2, but this difference is not statistically significant. There were no differences between the groups in relation to blood loss and improvement in KSS. Level of Evidence: Level I, therapeutic studies.


Subject(s)
Humans , Arthroplasty, Replacement, Knee/methods , Knee Prosthesis , Surgery, Computer-Assisted , Brazil , Hemostasis, Surgical , Knee , Prospective Studies , Surgical Procedures, Operative
20.
Coluna/Columna ; 10(2): 106-110, 2011. ilus, tab
Article in Portuguese | LILACS | ID: lil-595881

ABSTRACT

OBJETIVO: Avaliar as vantagens da cirurgia com navegação na revisão cirúrgica de deformidades vertebrais, verificando a acurácia deste método. MÉTODO: Foram revisados cincos pacientes com deformidades vertebrais que tiveram intercorrências na primeira cirurgia. Esses pacientes foram submetidos a um estudo de tomografia computadorizada (TC) com cortes de 2mm da coluna vertebral antes da segunda cirurgia. Nos cinco pacientes submetidos a reabordagem cirúrgica procedeu-se a instrumentação posterior com auxílio da navegação. Foram 84 parafusos pediculares implantados, sendo que 33 destes parafusos foram assistidos por computação. A navegação foi empregada nos níveis da deformidade vertebral onde a anatomia apresentava-se alterada inviabilizando o correto uso dos parâmetros anatômicos para inserção de parafusos pediculares. Nos demais níveis onde era possível a correta identificação desses parâmetros anatômicos foi utilizada a técnica padrão. A TC pós-operatória foi realizada para aferição do posicionamento dos parafusos pediculares. Avaliamos os resultados obtidos no posicionamento com e sem o uso da navegação. O tempo de fluoroscopia e o tempo da cirurgia também foram comparados com o padrão ouro da literatura. RESULTADOS: Dos 33 parafusos implantados com navegação observou-se uma acurácia de 94 por cento, com uma taxa de violação pedicular de 6 por cento. CONCLUSÕES: O uso da navegação é importante nas revisões cirúrgicas das deformidades vertebrais com anatomia alterada, influenciando no bom resultado final da cirurgia.


OBJECTIVE: To evaluate the benefits of computer-assisted spine surgery in re-operations due to vertebral deformities, and verify method accuracy. METHOD: A total of five patients with vertebral deformities who had complications during prior surgery were re-operated. These patients underwent a specific Computer Tomography scan with 2mm cuts of the spine before the second surgery. In the five patients who underwent re-operation, posterior instrumentation with the aid of computer-assisted spine surgery was performed. 84 pedicle screws were implanted, and in 33 of these computer-assisted surgeries were used. The computer-assisted surgery was used at the levels of spinal deformity where anatomy was altered making correct use of anatomical parameters for insertion of pedicle screws impossible. In the remaining levels, standard technique was used where the correct identification of anatomical parameters was possible. Post-operative computed tomography was performed to measure the placement of pedicle screws. We evaluated the results in positioning with and without the use of navigation. The fluoroscopy and surgery time were also compared with the gold standard of literature. RESULTS: Of the 33 screws implanted with navigation, 94 percent accuracy was observed; with a pedicle violation rate of 6 percent.The use of navigation is an important tool for surgical revision of the vertebral deformities with altered anatomy, influencing surgery result.


OBJETIVO: Evaluar las ventajas de la cirugía con navegación en reoperación por deformidades vertebrales, verificando la precisión de este método. MÉTODO: Fueron revisados cinco pacientes con deformidades vertebrales que tuvieron complicaciones en la primera cirugía. Esos pacientes fueron sometidos a un estudio de tomografía computada (TC) con cortes de 2 mm de la columna vertebral antes de la segunda cirugía. En los 5 pacientes sometidos al reabordaje quirúrgico se procedió a instrumentación posterior con auxilio de la navegación. Fueron 84 tornillos pediculares implantados, siendo que 33 de éstos fueron asistidos por computación. La navegación fue empleada en los niveles de la deformidad vertebral en donde la anatomía se presentaba alterada impidiendo el uso correcto de los parámetros anatómicos para inserción de tornillos pediculares. En los demás niveles en donde era posible la correcta identificación de esos parámetros anatómicos se utilizó la técnica estándar. La TC postoperatoria fue realizada para medición del posicionamiento de los tornillos pediculares. Evaluamos los resultados obtenidos en el posicionamiento con y sin el uso de la navegación. El tiempo de fluoroscopía y el tiempo de la cirugía también fueron comparados con la regla áurea de la literatura. RESULTADOS: De los 33 tornillos implantados con navegación se observó una precisión de 94 por ciento, con una tasa de violación pedicular del 6 por ciento. CONCLUSIONES: El uso de la navegación es importante en la reoperación de las deformidades vertebrales con anatomía alterada, influenciando en el buen resultado de la cirugía.


Subject(s)
Humans , Bone Screws , Reoperation , Scoliosis , Surgery, Computer-Assisted
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