Browsing by Author "Vargas Díaz, Alex Patricio"

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    Caracterización de programas de formación de especialistas en cirugía maxilofacial en Estados Unidos, Canadá y Chile
    (2020) Ramírez Skinner, Hernán; Vargas Díaz, Alex Patricio; Goñi Espíldora, Ignacio; Rosa Valencia, A.
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    Cirugía reconstructiva de la articulación temporomandibular
    (2013) Ramírez Skinner, Hernán; Goñi Espíldora, Ignacio; Contreras, Rodrigo; Zúñiga R., Sergio; Vargas Díaz, Alex Patricio; Vásquez B., Mauricio; Reinoso D. Carmen; Schulz R., Rolando; Hormazábal N., Fernando; Goñi Espíldora, Ignacio
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    Cleft lip and palate surgery simulator: Open source simulation model
    (Elsevier Ltd, 2024) Teuber Lobos, Cristian Andrés; Benítez, Benito K.; Lill, Yoriko; Kiser, Laura E.; Tache, Ana; Fernández Pose, María; Campolo González, Andrés Francisco; Nalabothu, Prasad; Sharma, Neha; Thieringer, Florian M.; Vargas Díaz, Alex Patricio; Mueller, Andreas A.
    Objective: Cleft lip and palate is the most common craniofacial birth anomaly and requires surgery in the first year of life. However, craniofacial surgery training opportunities are limited. The aim of this study was to present and evaluate an open-source cleft lip and palate hybrid (casting and three-dimensional (3D) printing) simulation model which can be replicated at low cost to facilitate the teaching and training of cleft surgery anatomy and techniques. Design: The soft tissue component of the cleft surgery training model was casted using a 3D printed 5-component mold and silicone. The bony structure was designed to simulate the facial anatomy and to hold the silicone soft tissue. Setting: Two groups, one group of trainees and one group of expert surgeons, at University Hospital Basel in Switzerland and Pontifical Catholic University of Chile in Santiago, Chile, tested the cleft lip and palate simulation model. Participants completed a Likert-based face and content validity questionnaire to assess the realism of the model and its usefulness in surgical training. Results: More than 70 % of the participants agreed that the model accurately simulated human tissues found in patients with unilateral cleft lip and palate. Over 60 % of the participants also agreed that the model realistically replicated surgical procedures. In addition, 80–90 % of the participants found the model to be a useful and appropriate tool for teaching the anatomy and surgical techniques involved in performing unilateral cleft lip and palate repair. Conclusion: This open-source protocol provides a cost-effective solution for surgeons to introduce the cleft morphology and surgical techniques to trainees on a regular basis. It addresses the current financial barrier that limits access to commercially available models during the early stages of surgeon training prior to specialization in the field.
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    Desmoplastic Fibroma of the Mandible in a Pediatric Patient : A Case Report of Resection and Reconstruction With A Six-Year Follow-Up
    (2017) Ramírez Skinner, Hernán; Vargas Díaz, Alex Patricio; Solar González, Antonieta Alejandra; Foncea, C.; Astorga, P.
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    Epithelial tumors of salivary glands. Review of 286 pathology reports
    (2018) Campolo González, Andrés; Ramírez Skinner, Hernán; Vargas Díaz, Alex Patricio; León Ramírez, Augusto; Goñi Espíldora, Ignacio; Solar Gonzalez, Antonieta Alejandra
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    Hiperplasia de cóndilo mandibular: Reporte de doce casos
    (2015) Pulgar B, D.; Goñi Espíldora, Ignacio; Reinoso D, C.; Schulz R, R.; Hormazábal N, Fernando.; Vargas Díaz, Alex Patricio; Ramírez S, H.
    Introducción: La hiperplasia condilar (HC) se define como un crecimiento patológico no neoplásico que afecta tanto al tamaño como a la morfología del cóndilo mandibular. Objetivo: Evaluar la eficacia y riesgos del tratamiento quirúrgico de la HC. Material y método: Estudio descriptivo, serie de casos. Se incluyó a todos los pacientes con diagnóstico de HC tratados en el Hospital Clínico de la Pontificia Universidad Católica de Chile entre enero de 2010 y febrero de 2014. Resultados: Doce pacientes fueron operados en nuestra institución por HC. El promedio de edad fue 19,3 ± 3,4 años. La forma de presentación más frecuente fue presencia de asimetría facial. Todos los pacientes fueron estudiados con SPECT que evidenció diferencia de captación mayor a 50% ± 3,1% entre ambos cóndilos. Todos los pacientes fueron tratados con condilectomía mandibular alta del lado afectado y en 3 casos, se realizó además cirugía ortognática en el mismo tiempo para corrección de maloclusión dental. La mediana de seguimiento fue de meses 16 (5 a 54 meses). En todos los pacientes se evidenció una mejora en la oclusión dental y simetría facial, con desaparición de la disfunción articular previa. Conclusiones: La HC es una entidad de poca frecuencia. La cirugía es eficaz y segura para el tratamiento de la HC.
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    Incidencia de tromboembolismo venoso en cirugía ortognática
    (2018) Campolo González, Andrés Francisco; Rioseco Ihnen, Tomás Alonso; Goñi Espildora, Ignacio; Vargas Díaz, Alex Patricio; Ramírez Skinner, Hernán
    Introducción: El tromboembolismo venoso (TEV) es una causa importante de morbimortalidad en la población hospitalaria y quirúrgica. Esta entidad tiene mecanismos fisiopatológicos bien definidos y descritos, además, de factores de riesgo que permiten una clasificación de los pacientes según diversos modelos de valoración, los cuales permiten adoptar medidas profilácticas. En el ámbito de la cirugía maxilofacial se han descrito bajos niveles de incidencia. Sin embargo, hay evidencia bastante limitada y representa un problema de salud al cual se le ha prestado poca atención en la literatura. Objetivo: El presente estudio tiene como objetivo conocer la incidencia de tromboembolismo venoso en pacientes sometidos a cirugía ortognática. Material y Método: Se evaluaron en forma retrospectiva fichas clínicas de 86 pacientes operados de cirugía ortognática entre octubre de 2006 y enero de 2016 en el Hospital Clínico de la Pontificia Universidad Católica de Chile. Se identificaron 2 casos de tromboembolismo pulmonar, lo cual corresponde a una incidencia de 2,6%. Sin embargo, no se obtuvo un espacio muestral suficiente para lograr identificar factores de riesgo específicos en esta población. Conclusiones: A pesar de la baja incidencia de TEV en pacientes sometidos a cirugía maxilofacial, es fundamental considerar el riesgo individual del paciente y el riesgo que implica la cirugía. La prolongación del tiempo quirúrgico, la estadía hospitalaria y la inmovilización prolongada pueden determinar un riesgo mayor de desarrollar este tipo de complicación, por lo tanto, es necesario considerarla y saber prevenirla de manera adecuada.
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    Manejo del trauma maxilofacial en la atención de urgencia por no especialistas
    (2017) Campolo, Andrés; Mix Vidal, Allan George; Foncea, Camila; Ramírez Skinner, Hernán; Vargas Díaz, Alex Patricio; Goñi Espíldora, Ignacio
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    El papiro de Edwin Smith y su trascendencia médica y odontológica
    (2012) Vargas Díaz, Alex Patricio; López Campillay, Marcelo Alejandro; Lillo, Claudio; Vargas, María Josefina
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    Repair of Inferior Alveolar Nerve in Orthognathic Surgery Simulator (RIANOS): A Novel, Open-Source, Combined 3D Printed, and Ex-Vivo Chicken Sciatic Nerve Training Model
    (2024) Navia, Alfonso; Tapia Coron, Sebastián Andrés; Rojas Sepulveda, Maria Fernanda; Rojas, Francisco; Vargas Díaz, Alex Patricio; Guerra, Claudio; Cuadra, Alvaro; Searle Ferrari, Susana Valeria; Ramírez, Hernán; Teuber Lobos, Cristián Andrés
    Objective: Accidental transection of the inferior alveolar nerve (IAN) during bilateral sagittal split osteotomies (BSSO) has a reported incidence of up to 7%, determining important sensory disturbances in patients. Proper repair demands the need of microsurgical anastomosis skills. No previous training models have been described to simulate this. Therefore, we present a validated simulation model for intraoral repair of transected IAN.Methods: A CT scan of an orthognathic surgery patient was modified and a 3D model of a mandible with BSSO was printed. Chicken thigh anatomy was reviewed, and 2.5 mm sciatic nerves were dissected and mounted in the model. In order to simulate intraoral work depth, it was put inside a dental phantom or medical glove box. The model was tested by a group of experts (n = 12), simulating a transected IAN repair inside the mouth with both loupes and a double visor surgical training microscope. A survey was conducted to assess Face and Content validity.Results: The model was named RIANOS after Repair of Inferior Alveolar Nerve in Orthognathic Surgery Simulator. The printing cost of each model was approximately US$3 and the design file is open-source and available for download. All experts “Strongly Agreed” that the model was useful for training inferior alveolar nerve microsurgical repair and would consider implementing it with their residents.Conclusions: We developed a low cost, reproducible, open-source simulator for IAN injury repair training during BSSO. Face and Content validity was achieved through evaluation by a group of experts.
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    Sensitivity analysis of geometric errors in additive manufacturing medical models
    (2015) Pinto, José Miguel; Arrieta, Cristóbal; Andía Kohnenkampf, Marcelo Edgardo; Uribe Arancibia, Sergio A.; Ramos Grez, Jorge; Vargas Díaz, Alex Patricio; Irarrázaval Mena, Pablo; Tejos Núñez, Cristián Andrés
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    Simulating A Subcondylar Mandibular Fracture With Intraoral Open Reduction and Internal Fixation: A Novel Education Tool for Residents
    (Sage Publications INC, 2022) Rojas, Francisco; Tapia, Sebastián; Campolo González, Andrés Francisco; Vargas Díaz, Alex Patricio; Ramírez Skinner, Hernan Eduardo; Benítez, Benito K.; Teuber Lobos, Cristian Andrés
    Study Design Face and content validation of a surgical simulation model. Objective Open reduction and internal fixation in displaced subcondylar mandibular fractures is standard care. This requires an extraoral (eg: retromandibular, transparotideal) or intraoral approach. An intraoral approach requires further training since specialized instrumentation such as the 90° screwdriver system and endoscopes might be needed. Currently, no simulation models are available for training residents in intraoral reduction and fixation of subcondylar mandibular fractures. Therefore, we present a validated simulation model for intraoral treatment of subcondylar mandibular fractures. Methods Based on a computer tomography data set, we designed and printed a 3D model of a mandible with a unilateral subcondylar fracture. To simulate intraoral work depth, it was positioned inside a dental phantom. We tested the model by a group of experts (n = 8), simulating intraoral reduction and fixation of a unilateral subcondylar fracture, using a 90° screwdriver system, a 1.0 subcondylar plate (lambda), and 5-6 mm screws. We assessed Face and Content validity by survey. Results We provided an open-source printable fracture model. Printing costs were approximately US $10. Experts “Agreed” the model resembling the real scenario and its use for training intraoral reduction and fixation of subcondylar mandibular fractures.
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    Síndrome de Lesch-Nyhan y automutilación oral. Reporte de un caso
    (2018) Campolo González, Andrés; Vargas Díaz, Alex Patricio; Fontboté Riesco, Daniel Alejandro; Hernández, Marta
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    Sistema para obtener geometría y resistencia similares a huesos (Chile, concesión n° 53338)
    Ramos Grez, Jorge; Vargas Díaz, Alex Patricio; Bórquez Hodgson, Benjamín; Valenzuela Ramírez, Luis
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    Spontaneous remission of eosinophilic granuloma of the maxilla after incisional biopsy: a case report
    (2016) Vargas Díaz, Alex Patricio; Ramírez Skinner, Hernán; Ramírez, Pablo.; Foncea, Camila.; Venegas, Bernardo.; Astorga, Paula.
    Abstract Background Langerhans cell histiocytosis (LCH), previously known as Histiocytosis X, is an infrequent disease that congregates a wide spectrum of clinical presentations with variable systemic involvement. Unification of these diseases under only one category is based on the almost identical histopathologic features of the lesions, but the etiology and proper approach for each presentation remains controversial. The localized alternative of Langerhans cell histiocytosis (LLCH), known as Eosinophilic Granuloma (EG) of bone, is the predominant clinical presentation of LCH. The maxilla is involved in 1 % of the head and neck region cases, representing an uncommon condition in this area. Case Presentation In this clinical case report, it is described a case of a 16-year-old male patient with an asymptomatic osteolytic lesion at first upper left molar apical level, a finding detected on control radiographic images was reported as “Monostotic Eosinophilic granuloma of the maxillary bone”, which was later confirmed through an incisional biopsy. A surgical excision was initially planned, but finally it was not performed due to a spontaneous healing of the lesion after the incisional biopsy. Conclusions The presented case supports a conservative approach in the management of solitary EG of maxillary and mandibular bone lesions and even supports an expectant attitude in the course of treatment given the possibility of a spontaneous regression after the biopsy, especially in small lesions.Abstract Background Langerhans cell histiocytosis (LCH), previously known as Histiocytosis X, is an infrequent disease that congregates a wide spectrum of clinical presentations with variable systemic involvement. Unification of these diseases under only one category is based on the almost identical histopathologic features of the lesions, but the etiology and proper approach for each presentation remains controversial. The localized alternative of Langerhans cell histiocytosis (LLCH), known as Eosinophilic Granuloma (EG) of bone, is the predominant clinical presentation of LCH. The maxilla is involved in 1 % of the head and neck region cases, representing an uncommon condition in this area. Case Presentation In this clinical case report, it is described a case of a 16-year-old male patient with an asymptomatic osteolytic lesion at first upper left molar apical level, a finding detected on control radiographic images was reported as “Monostotic Eosinophilic granuloma of the maxillary bone”, which was later confirmed through an incisional biopsy. A surgical excision was initially planned, but finally it was not performed due to a spontaneous healing of the lesion after the incisional biopsy. Conclusions The presented case supports a conservative approach in the management of solitary EG of maxillary and mandibular bone lesions and even supports an expectant attitude in the course of treatment given the possibility of a spontaneous regression after the biopsy, especially in small lesions.Abstract Background Langerhans cell histiocytosis (LCH), previously known as Histiocytosis X, is an infrequent disease that congregates a wide spectrum of clinical presentations with variable systemic involvement. Unification of these diseases under only one category is based on the almost identical histopathologic features of the lesions, but the etiology and proper approach for each presentation remains controversial. The localized alternative of Langerhans cell histiocytosis (LLCH), known as Eosinophilic Granuloma (EG) of bone, is the predominant clinical presentation of LCH. The maxilla is involved in 1 % of the head and neck region cases, representing an uncommon condition in this area. Case Presentation In this clinical case report, it is described a case of a 16-year-old male patient with an asymptomatic osteolytic lesion at first upper left molar apical level, a finding detected on control radiographic images was reported as “Monostotic Eosinophilic granuloma of the maxillary bone”, which was later confirmed through an incisional biopsy. A surgical excision was initially planned, but finally it was not performed due to a spontaneous healing of the lesion after the incisional biopsy. Conclusions The presented case supports a conservative approach in the management of solitary EG of maxillary and mandibular bone lesions and even supports an expectant attitude in the course of treatment given the possibility of a spontaneous regression after the biopsy, especially in small lesions.Abstract Background Langerhans cell histiocytosis (LCH), previously known as Histiocytosis X, is an infrequent disease that congregates a wide spectrum of clinical presentations with variable systemic involvement. Unification of these diseases under only one category is based on the almost identical histopathologic features of the lesions, but the etiology and proper approach for each presentation remains controversial. The localized alternative of Langerhans cell histiocytosis (LLCH), known as Eosinophilic Granuloma (EG) of bone, is the predominant clinical presentation of LCH. The maxilla is involved in 1 % of the head and neck region cases, representing an uncommon condition in this area. Case Presentation In this clinical case report, it is described a case of a 16-year-old male patient with an asymptomatic osteolytic lesion at first upper left molar apical level, a finding detected on control radiographic images was reported as “Monostotic Eosinophilic granuloma of the maxillary bone”, which was later confirmed through an incisional biopsy. A surgical excision was initially planned, but finally it was not performed due to a spontaneous healing of the lesion after the incisional biopsy. Conclusions The presented case supports a conservative approach in the management of solitary EG of maxillary and mandibular bone lesions and even supports an expectant attitude in the course of treatment given the possibility of a spontaneous regression after the biopsy, especially in small lesions.