Browsing by Author "Rojas, Francisco"

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    Malakoplakia mimicking a locally advanced colorectal neoplasm
    (2021) Irarrazaval-Mainguyague, Maria J.; Cabreras, Manuel; Oksenberg, Sebastian; Pulgar, Maria A.; Rojas, Francisco; Alvarez, Manuel; Quezada-Diaz, Felipe F.
    Malakoplakia is a rare disease. Clinical presentation is non-specific, making its diagnosis an incidental finding on histopathological analysis. The aim of this case report is to describe a patient diagnosed with colon, renal and soft tissue malacoplakia mimicking a locally advanced colorectal cancer. A 75-year-old man was admitted due to intense abdominal pain. No relevant findings at the physical examination. Computed tomography showed parietal thickening of the descending colon with left kidney, iliopsoasmuscle and retroperitoneum involvement. An elevated blood serum creatinine, elevated glycated hemoglobin and urinary infection were detected. Surgery was decided for suspicious symptomatic colonic neoplasm. Left segmental colectomy with left partial nephrectomy and retroperitoneal soft tissue resection was performed. Pathology report was compatible with malakoplakia. Malakoplakia is a rare disease and may affect multiple organs. Because there are no clinical-specific findings, diagnosis is usually made with histopathological study of the surgical specimen.
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    Modelo de desarrollo del conocimiento matemático desde el Saber y Hacer del pueblo mapuche
    (2021) Huencho, Anahí ; Chandía, Eugenio ; Rojas, Francisco ; Williamson, Guillermo
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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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    SANTIAGO – VILLARRICA – BARCELONA: THE STATISTICAL INVESTIGATIVE CYCLE IN PRIMARY EDUCATION TEACHER TRAINING
    (International Association for Statistical Education, 2021) Ubilla, Francisca M.; Vásquez Ortiz, Claudia; Rojas, Francisco; Gorgorio, Núria
    We consider the ability to complete an investigative cycle as an indicator of the robustness of students’ statistical knowledge. From this standpoint, we analyzed the written reports of primary education student teachers when they developed an investigative cycle in a Chilean and a Spanish university. In their development of the stages of the cycle we observed characteristics common to the centers (for example, summary research questions and conclusions that are a simple concatenation of results), and differential features (the data collection tools and techniques, among others). Armed with knowledge of how future teachers approach and understand an investigative cycle, we are able to contribute ideas that influence their training, building bridges between what they learn and what they should teach
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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.