Page 1. 23 Revista CES Odontología Vol. 18 - No. 1 2005 Resúmenes de InvestigaciónResúmenes de In... more Page 1. 23 Revista CES Odontología Vol. 18 - No. 1 2005 Resúmenes de InvestigaciónResúmenes de Investigación Asociación del genotipo de la il-1b +3953 en pacientes con y sin enfermedad periodontal cronica. medellín 2004 estudio de casos y controles ...
Objectives: Biomechanical evaluation of mandibular transport distraction osteogenesis (MTDO) devi... more Objectives: Biomechanical evaluation of mandibular transport distraction osteogenesis (MTDO) devices is critical for assessing their mechanical soundness. This study examines strength, stiffness, and stability of an MTDO device under a physiological load with different numbers and positions of cortical screws. We hypothesized that the MTDO device is functional and biomechanically stable under physiological parameters. Methods: A three dimensional geometric model of the MTDO device was used to create a finite element model (FEM) including material mechanical properties, three dimensional solid elements, boundary conditions at the screw holes, and a 200 N force to simulate a reduced human bite force one month after surgery. The mechanical strength, stiffness and stability of the MTDO device for different numbers and positions of the fixation screws was evaluated using FEM Cosmos/M software to obtain stresses, vertical deformation, and strain patterns that were validated with lab resul...
Electronic system for the acquisition, processing and storage of bite force data Introduction and... more Electronic system for the acquisition, processing and storage of bite force data Introduction and Objetive: This study describes the design and construction of an electronic system for a bite force sensor data acquisition, (Gnathodynamometer, GIB), that had been previously developed with the aim of storing human oclusal force data. The subjects are identified by their name and a 4 digit
Objetivo: Aplicar un sistema piloto de tele-radiología en la ciudad de Medellín con software de a... more Objetivo: Aplicar un sistema piloto de tele-radiología en la ciudad de Medellín con software de acceso remoto que permita la comunicación e interpretación a distancia de imágenes biomédicas. Materiales y métodos: Se utilizaron imágenes de estudios de resonancia magnética y tomografía computadorizada almacenados en formato DICOM. Los datos se transmitieron en una red punto a punto mediante líneas de red digital de servicios integrados (RDSI) entre dos centros de diagnóstico radiológico. El sistema se llevó a cabo bajo arquitectura PC basada en Intel x86 con sistema operativo Windows® 2000. Resultados: Para la lectura y visualización local de imágenes almacenadas en formato DICOM, se desarrolló una aplicación en Java con funciones que permiten su manipulación y la opción de exportar a otros formatos como JPEG, TIFF y BMP. Conclusiones: El sistema permitió en modalidades como tomografía computadorizada (TC) e imagen por resonancia magnética (RM) un diagnóstico e interpretación remota c...
Objective: To implement a teleradiology pilot system in Medellín city using software for remote a... more Objective: To implement a teleradiology pilot system in Medellín city using software for remote access, this allows the communication and interpretation of biomedical images at distance. Materials and methods: Images from different magnetic resonance and computed tomography studies stored in DICOM format were used. Data were transmitted in a point-to-point network using an integrated services digital network (ISDN) line between two radiological diagnostic centers. The system was developed under PC Intel's x86 architecture, with Windows® 2000 as the operating system. Results: In order to read and visualize images stored in DICOM format, a Java application with functions that allow their manipulation and the option to export them to other formats such as JPEG, TIFF and BMP was developed. Conclusion: The system allows a clinically reliable diagnostic and remote interpretation for modalities such as computed tomography (CT) and magnetic resonance (MR) images, with acceptable respons...
The aim of this study was to develop a three-dimensional finite element model of the mandible, in... more The aim of this study was to develop a three-dimensional finite element model of the mandible, including its TMJ. The model consisted of 7942 nodes and 41,010 elements, which were obtained from a convergence test, done to minimize the result error. It included cancellous and cortical bone, periodontal ligament, masticatory muscles (masseters, temporalis, lateral and internal pterygoids), teeth and the articular disk. All characteristics such as dental, mandibular, and muscle geometry were obtained from a computerized tomography (CT) of a living person. CT sections were scanned and digitized with a CAD software program. After images were adequately assembled, a vertical tracing was done which allowed the definition of a three-dimensional mesh. Modeling of teeth was carried out independently and the periodontal ligament was later included, limiting the alveolar area. Muscles were modeled based on flat-scale photographs and total muscle force was distributed in multiple vectors. The ar...
ABSTRACT Objectives: Bone transport distraction is a surgical procedure in which a portion of bon... more ABSTRACT Objectives: Bone transport distraction is a surgical procedure in which a portion of bone is moved between two bony edges while regenerated bone bridges the gap. Previous studies have focused upon either the procedure itself or the minimum period of consolidation. Few studies have focused on the microstructure of the regenerated bone. The objective of this work is to quantify the differences in microstructure of the regenerated cortical bone compared to the pre-existing control bone. Methods: Five adult male American foxhound dogs were affixed with a novel bone transport distraction device on the buccal aspect of the mandible while the contralateral side was used as control. After a 6-week consolidation period, the animals were sacrificed and cylindrical cortical samples were taken from the buccal and lingual aspects of both the regenerate and the control bone. An ultrasonic wave test was used to determine direction of maximum stiffness, then the specimens were cut in half perpendicular to that direction for histological analysis and evaluation using BIOQUANT software. Results: Photomicrographic observations show significant differences in the microstructure not only between the regenerate and control cortical bone, but also between buccal and lingual positions in the regenerate cortical bone. The lingual aspect of the regenerate bone has more mature osteons of greater diameter than the buccal. Whereas the lingual aspect of the regenerate more closely resembles the control, the buccal aspect of the regenerate contains few osteons but many osteocytes, usually associated with woven bone. Conclusion: There are several differences in microstructure between regenerate and control cortical bone that suggest an incomplete mineralization of the new tissue, although given a longer consolidation period, it is probable that the regenerate cortical bone would eventually become comparable to the native bone. Supported by grants 3R43DE017259 and 5R42DE15437 from the NIH/NIDCR
Page 1. 23 Revista CES Odontología Vol. 18 - No. 1 2005 Resúmenes de InvestigaciónResúmenes de In... more Page 1. 23 Revista CES Odontología Vol. 18 - No. 1 2005 Resúmenes de InvestigaciónResúmenes de Investigación Asociación del genotipo de la il-1b +3953 en pacientes con y sin enfermedad periodontal cronica. medellín 2004 estudio de casos y controles ...
Objectives: Biomechanical evaluation of mandibular transport distraction osteogenesis (MTDO) devi... more Objectives: Biomechanical evaluation of mandibular transport distraction osteogenesis (MTDO) devices is critical for assessing their mechanical soundness. This study examines strength, stiffness, and stability of an MTDO device under a physiological load with different numbers and positions of cortical screws. We hypothesized that the MTDO device is functional and biomechanically stable under physiological parameters. Methods: A three dimensional geometric model of the MTDO device was used to create a finite element model (FEM) including material mechanical properties, three dimensional solid elements, boundary conditions at the screw holes, and a 200 N force to simulate a reduced human bite force one month after surgery. The mechanical strength, stiffness and stability of the MTDO device for different numbers and positions of the fixation screws was evaluated using FEM Cosmos/M software to obtain stresses, vertical deformation, and strain patterns that were validated with lab resul...
Electronic system for the acquisition, processing and storage of bite force data Introduction and... more Electronic system for the acquisition, processing and storage of bite force data Introduction and Objetive: This study describes the design and construction of an electronic system for a bite force sensor data acquisition, (Gnathodynamometer, GIB), that had been previously developed with the aim of storing human oclusal force data. The subjects are identified by their name and a 4 digit
Objetivo: Aplicar un sistema piloto de tele-radiología en la ciudad de Medellín con software de a... more Objetivo: Aplicar un sistema piloto de tele-radiología en la ciudad de Medellín con software de acceso remoto que permita la comunicación e interpretación a distancia de imágenes biomédicas. Materiales y métodos: Se utilizaron imágenes de estudios de resonancia magnética y tomografía computadorizada almacenados en formato DICOM. Los datos se transmitieron en una red punto a punto mediante líneas de red digital de servicios integrados (RDSI) entre dos centros de diagnóstico radiológico. El sistema se llevó a cabo bajo arquitectura PC basada en Intel x86 con sistema operativo Windows® 2000. Resultados: Para la lectura y visualización local de imágenes almacenadas en formato DICOM, se desarrolló una aplicación en Java con funciones que permiten su manipulación y la opción de exportar a otros formatos como JPEG, TIFF y BMP. Conclusiones: El sistema permitió en modalidades como tomografía computadorizada (TC) e imagen por resonancia magnética (RM) un diagnóstico e interpretación remota c...
Objective: To implement a teleradiology pilot system in Medellín city using software for remote a... more Objective: To implement a teleradiology pilot system in Medellín city using software for remote access, this allows the communication and interpretation of biomedical images at distance. Materials and methods: Images from different magnetic resonance and computed tomography studies stored in DICOM format were used. Data were transmitted in a point-to-point network using an integrated services digital network (ISDN) line between two radiological diagnostic centers. The system was developed under PC Intel's x86 architecture, with Windows® 2000 as the operating system. Results: In order to read and visualize images stored in DICOM format, a Java application with functions that allow their manipulation and the option to export them to other formats such as JPEG, TIFF and BMP was developed. Conclusion: The system allows a clinically reliable diagnostic and remote interpretation for modalities such as computed tomography (CT) and magnetic resonance (MR) images, with acceptable respons...
The aim of this study was to develop a three-dimensional finite element model of the mandible, in... more The aim of this study was to develop a three-dimensional finite element model of the mandible, including its TMJ. The model consisted of 7942 nodes and 41,010 elements, which were obtained from a convergence test, done to minimize the result error. It included cancellous and cortical bone, periodontal ligament, masticatory muscles (masseters, temporalis, lateral and internal pterygoids), teeth and the articular disk. All characteristics such as dental, mandibular, and muscle geometry were obtained from a computerized tomography (CT) of a living person. CT sections were scanned and digitized with a CAD software program. After images were adequately assembled, a vertical tracing was done which allowed the definition of a three-dimensional mesh. Modeling of teeth was carried out independently and the periodontal ligament was later included, limiting the alveolar area. Muscles were modeled based on flat-scale photographs and total muscle force was distributed in multiple vectors. The ar...
ABSTRACT Objectives: Bone transport distraction is a surgical procedure in which a portion of bon... more ABSTRACT Objectives: Bone transport distraction is a surgical procedure in which a portion of bone is moved between two bony edges while regenerated bone bridges the gap. Previous studies have focused upon either the procedure itself or the minimum period of consolidation. Few studies have focused on the microstructure of the regenerated bone. The objective of this work is to quantify the differences in microstructure of the regenerated cortical bone compared to the pre-existing control bone. Methods: Five adult male American foxhound dogs were affixed with a novel bone transport distraction device on the buccal aspect of the mandible while the contralateral side was used as control. After a 6-week consolidation period, the animals were sacrificed and cylindrical cortical samples were taken from the buccal and lingual aspects of both the regenerate and the control bone. An ultrasonic wave test was used to determine direction of maximum stiffness, then the specimens were cut in half perpendicular to that direction for histological analysis and evaluation using BIOQUANT software. Results: Photomicrographic observations show significant differences in the microstructure not only between the regenerate and control cortical bone, but also between buccal and lingual positions in the regenerate cortical bone. The lingual aspect of the regenerate bone has more mature osteons of greater diameter than the buccal. Whereas the lingual aspect of the regenerate more closely resembles the control, the buccal aspect of the regenerate contains few osteons but many osteocytes, usually associated with woven bone. Conclusion: There are several differences in microstructure between regenerate and control cortical bone that suggest an incomplete mineralization of the new tissue, although given a longer consolidation period, it is probable that the regenerate cortical bone would eventually become comparable to the native bone. Supported by grants 3R43DE017259 and 5R42DE15437 from the NIH/NIDCR
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