Examinando por Autor "Isaza, J.F."
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Ítem Are maximum bite forces of subjects 7 to 17 years of age related to malocclusion?(Allen Press Inc., 2016-05-01) Roldán, S.I.; Restrepo, L.G.; Isaza, J.F.; Vélez, L.G.; Buschang, P.H.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)Objective: To determine the effects of occlusion on maximum bite force of growing subjects. Materials and Methods: Incisor and first molar bite force of children and adolescents was evaluated. Four cohorts were measured annually for 3 years, starting at approximately 7, 9, 12, and 15 years of age, respectively. The initial sample included 182 females and 198 males; there were 130 subjects with normal occlusion, 111 with Class I malocclusion, and 139 with Class II malocclusion. Multilevel analyses were performed to model the growth changes and compare groups. Results: Maximum bite force increased significantly (P < .05) over time. Incisal forces peaked at 14.3 and 15.3 years of age for females and males, respectively. Maximum molar bite force peaked at 16 years for both males and females. Subjects with normal occlusion had significantly higher bite force than subjects with malocclusion. Maximum molar bite force exhibited a significant testing effect, with forces increasing 2.6 kg each year that the tests were repeated. Conclusions: Malocclusion has a detrimental effect on bite force. Changes in maximum bite force are also due to age, sex, and repeated testing.Ítem Are maximum bite forces of subjects 7 to 17 years of age related to malocclusion?(Allen Press Inc., 2016-05-01) Roldán, S.I.; Restrepo, L.G.; Isaza, J.F.; Vélez, L.G.; Buschang, P.H.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)Objective: To determine the effects of occlusion on maximum bite force of growing subjects. Materials and Methods: Incisor and first molar bite force of children and adolescents was evaluated. Four cohorts were measured annually for 3 years, starting at approximately 7, 9, 12, and 15 years of age, respectively. The initial sample included 182 females and 198 males; there were 130 subjects with normal occlusion, 111 with Class I malocclusion, and 139 with Class II malocclusion. Multilevel analyses were performed to model the growth changes and compare groups. Results: Maximum bite force increased significantly (P < .05) over time. Incisal forces peaked at 14.3 and 15.3 years of age for females and males, respectively. Maximum molar bite force peaked at 16 years for both males and females. Subjects with normal occlusion had significantly higher bite force than subjects with malocclusion. Maximum molar bite force exhibited a significant testing effect, with forces increasing 2.6 kg each year that the tests were repeated. Conclusions: Malocclusion has a detrimental effect on bite force. Changes in maximum bite force are also due to age, sex, and repeated testing.Ítem Diseño y manufactura de un implante personalizado de cráneo(SPRINGER, 2013-01-01) Isaza, J.F.; Correa, S.; Franco, J.M.; Torres, C.; Bedoya, B.This paper describes the methodology used to design a custom-made cranial implant for a 26 year-old patient, who suffered a lesion in the left frontoparietal region of the skull caused by a fibrous dysplasia. The design of the implant was carried out from the 3D reconstruction of the skull of the patient, obtained by a CT- Scan, using Rapid Form 2006. Once the preliminary design was obtained, 3D models of the injured region of the skull and implant were fabricated in a Rapid Prototyping (RP) machine using the Fused Deposition Modeling Technology (FDM) with the purpose of making a functional and dimensional validation of the implant. Subsequently, the implant was fabricated in titanium alloy (Ti6Al4V). With the methodology, the prosthesis was successfully implanted. The surgical time decreased by 50%, compared with the same type of surgery in which standard commercial implants and titanium meshes are used; due, principally, to the need of implementing trial and error procedures, which intend to achieve a good fit of the implant increasing the risk of the patient. Finally, the aesthetic appearance of the patient was recovered, allowing the patient to safely perform daily activities. © 2013 Springer.Ítem Diseño y manufactura de un implante personalizado de cráneo(SPRINGER, 2013-01-01) Isaza, J.F.; Correa, S.; Franco, J.M.; Torres, C.; Bedoya, B.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)This paper describes the methodology used to design a custom-made cranial implant for a 26 year-old patient, who suffered a lesion in the left frontoparietal region of the skull caused by a fibrous dysplasia. The design of the implant was carried out from the 3D reconstruction of the skull of the patient, obtained by a CT- Scan, using Rapid Form 2006. Once the preliminary design was obtained, 3D models of the injured region of the skull and implant were fabricated in a Rapid Prototyping (RP) machine using the Fused Deposition Modeling Technology (FDM) with the purpose of making a functional and dimensional validation of the implant. Subsequently, the implant was fabricated in titanium alloy (Ti6Al4V). With the methodology, the prosthesis was successfully implanted. The surgical time decreased by 50%, compared with the same type of surgery in which standard commercial implants and titanium meshes are used; due, principally, to the need of implementing trial and error procedures, which intend to achieve a good fit of the implant increasing the risk of the patient. Finally, the aesthetic appearance of the patient was recovered, allowing the patient to safely perform daily activities. © 2013 Springer.Ítem Ejecución de un sistema piloto de tele-radiología en Medellín, Colombia(Corporacion Editora Medica del Valle, 2006-01-01) García, A.; Isaza, J.F.; Zapata, U.; Roldán, S.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)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 ×86 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 response times. © 2006 Corporación Editora Médica del Valle.Ítem Resistance of teeth restored with prefabricated posts to maximum intercuspidation loads, mastication and bruxism(Editorial Ciencias Medicas, 2013-01-01) Vélez, S.C.; Isaza, J.F.; Gaviria, A.S.; Naranjo, M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)Objective: using the finite element method, determine the resistance of teeth restored with prefabricated posts to maximum static intercuspidation loads, cyclical mastication loads and bruxism, and analyze the effect of periodontal loss on resistance by restorations. Methods: using the finite element method, an in vitro study was conducted of teeth with periodontal loss rehabilitated with prefabricated glass fiber, carbon and titanium posts. Reconstruction of the teeth was based on tomographic images from a periodontically healthy patient. Results: it was shown that rehabilitations did not tend to yield to static loads, irrespective of post material or the degree of periodontal loss. For bruxism and 4 mm periodontal loss, dentin durability was 60 000 cycles, irrespective of post material. For mastication loads and a healthy periodont, dentin failure occurs at 100 000 cycles with titanium posts, 200 000 cycles with carbon fiber posts, and 1 100 000 cycles with glass fiber posts. For 2 mm periodontal loss, dentin durability decreased to 4 000 cycles with titanium posts, 5 000 cycles with carbon fiber posts, and 7 000 cycles with glass fiber posts. For 4 mm periodontal loss, dentin durability is estimated at 1 000 cycles, irrespective of post material. Conclusions: restorations with glass fiber, carbon and titanium prefabricated posts do not yield to maximum static intercuspidation loads, irrespective of the degree of periodontal loss. Prefabricated posts exhibit endless resistance to cyclic loads. Dentin is the structure most severely affected by such events. © 2013 1995, Editorial Ciencias médicas.Ítem Resistance of teeth restored with prefabricated posts to maximum intercuspidation loads, mastication and bruxism(Editorial Ciencias Medicas, 2013-01-01) Vélez, S.C.; Isaza, J.F.; Gaviria, A.S.; Naranjo, M.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)Objective: using the finite element method, determine the resistance of teeth restored with prefabricated posts to maximum static intercuspidation loads, cyclical mastication loads and bruxism, and analyze the effect of periodontal loss on resistance by restorations. Methods: using the finite element method, an in vitro study was conducted of teeth with periodontal loss rehabilitated with prefabricated glass fiber, carbon and titanium posts. Reconstruction of the teeth was based on tomographic images from a periodontically healthy patient. Results: it was shown that rehabilitations did not tend to yield to static loads, irrespective of post material or the degree of periodontal loss. For bruxism and 4 mm periodontal loss, dentin durability was 60 000 cycles, irrespective of post material. For mastication loads and a healthy periodont, dentin failure occurs at 100 000 cycles with titanium posts, 200 000 cycles with carbon fiber posts, and 1 100 000 cycles with glass fiber posts. For 2 mm periodontal loss, dentin durability decreased to 4 000 cycles with titanium posts, 5 000 cycles with carbon fiber posts, and 7 000 cycles with glass fiber posts. For 4 mm periodontal loss, dentin durability is estimated at 1 000 cycles, irrespective of post material. Conclusions: restorations with glass fiber, carbon and titanium prefabricated posts do not yield to maximum static intercuspidation loads, irrespective of the degree of periodontal loss. Prefabricated posts exhibit endless resistance to cyclic loads. Dentin is the structure most severely affected by such events. © 2013 1995, Editorial Ciencias médicas.