Examinando por Autor "Olate, S."
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Ítem Acceso Abierto Electrical stimulation in the bone repair of defects created in rabbit skulls [Estimulación Eléctrica en la Reparación Ósea de Defectos Creados en Cráneos de Conejos](Universidad de la Frontera, 2015) Silva, C.; Olate, S.; Pozzer, L.; Muñoz, M.; Cantín, M.; Uribe, F.; de Albergaría-Barbosa, J.R.Electrical stimulation has been used in different conditions for tissue regeneration. The aim of this study was to analyze the tissue response of defects created in rabbit skulls to electrical stimulation. Two groups were formed, each with 9 New Zealand rabbits; two 5 mm defects were made, one in each parietal, with one being randomly filled with autogenous bone extracted as particles and the other maintained only with blood clotting. The rabbits were euthanized at 8 weeks and 15 weeks to then study the samples collected histologically. In the 8-week analysis bone formation was observed in the defects in the test and control filled with bone graft, whereas the defects with clotting presented a very early stage of bone formation with abundant connective tissue. At 15 weeks an advanced stage of bone regeneration was identified in the defects with bone graft, whereas no significant differences were found in the electrically stimulated defects. In conclusion, electrical stimulus does not alter the sequence of bone formation; new studies could help establish patterns and influences of the stimulus on bone regeneration. © 2015, International Journal of Morphology. All rights reserved.Ítem Acceso Abierto Fotografía 2D en el diagnóstico de asimetrías faciales [2D photography in facial asymmetry diagnosis](Universidad de la Frontera, 2015) Olate, S.; Cantín, M.; Vásquez, B.; Muñoz, M.; de Moraes M.The aim of this research was to find the relation between facial asymmetry and loss of continuity in median line of maxillary and mandibular teeth. A descriptive study was carried out in 18 subjects with facial asymmetry with surgical indication and observed at the Division of Oral and Maxillofacial Surgery of the Universidad de La Frontera. In all of them the grade of facial asymmetry and the relation in median line of the maxillary and mandibular teeth was evaluated using the t student test considering p value < 0.05; all the evaluations were executed using 2D photography of the face and tooth obtained with standardized conditions. In all the subjects we observed dental asymmetry with almost 7 mm from the median line; statistical relations between dental asymmetry and facial asymmetry. It is concluded that in subjects asking for dental asymmetry treatment a facial evaluation is necessary in view of the relation with skeletal facial deformity. © 2015, Universidad de la Frontera. All rights reserved.Ítem Acceso Abierto Generation of 3D tooth models based on three-dimensional scanning to study the morphology of permanent teeth [Generación de modelos de diente 3D basados en escaneo tridimensional para el estudio morfológico de dientes permanentes](Universidad de la Frontera, 2015) Cantín, M.; Muñoz, M.; Olate, S.The dental student should have thorough knowledge of the dental morphology and develop adequate manual skill to reproduce any part of the tooth, thus maintaining the perfect correlation with associated structures. Computers are becoming an integral part of dental education and dental practice, especially for the acquisition of information in three dimensions and the production of solid objects from computer models. The aim was to present educational material that would allow the dental student to learn to easily identify the morphologic characteristics of permanent teeth, using new technological tools. In order to do this, healthy permanent teeth were scanning by NextEngine™ 3D Scanner HD using the MultiDrive. A 360° scan in macro range was chosen in each case. The number of scans for this family was 16, due to surface irregularities that require readings from a greater number of angles. Volumes of external structures of the scanned tooth were generated and stored in *.STL files. Virtual models were transferred in to programs used for producing physical prototypes that faithfully reproduce anatomy of interest using ReplicatorG software and MBot Grid II 3D printer. 3D virtual and printed macro models of permanent teeth were obtained. This models allows an excellent visualization of the morphological characteristics of permanent teeth. 3D virtual and printed teeth, derived from real tooth, are intended to be a valuable learning tool that can be used in addition to or instead of extracted teeth and they are anticipated to represent an improvement over plastic teeth. © 2015, Universidad de la Frontera. All rights reserved.Ítem Acceso Abierto Mandibular condyle repair after partial condylectomy in patients with active condylar hyperplasia [Reparación de cóndilos mandibulares después de condilectomía parcial por hiperplasia condilar activa](Universidad de la Frontera, 2015) Olate, S.; Cantín, M.; Palmieri, C.; Alister, J.P.; Muñoz, M.; de Moraes, M.The different aspects of unilateral condylar hyperplasia have been studied and continue to be controversial; nevertheless, treatment based on condylectomy has been established as part of the working protocol. The aim of this investigation was to identify the bone repair observed in surgically treated condyles after 1 year using cone beam computed tomography (CBCT). Nine subjects were included in this study (6 female and 3 male) with an average age of 18.5 years. They had been diagnosed with active unilateral condylar hyperplasia using SPECT, clinical follow-up of progressive facial asymmetry and CBCT. Patients underwent exclusive condylectomy surgery with a piezoelectric system without disc replacement, orthognatic surgery or any other type of adjunct surgical procedure. Later, they were treated orthodontically for dental compensation or as preparation for orthognatic surgery. A CBCT was performed in the first postoperative month and after 1 year from the surgery to analyze variables. The CBCT at 1 month showed a clear and distinct slice of the condyle without defects or irregularities; the distance from the condylar remnant to the articular fossa reached 8.5 mm in the most extreme case. After 1 year, condylar bone remodeling was observed, with areas of lateral and superior curvature and characteristics of normal condyles, with cortical bone present and a maximum distance of 4.5 mm from the condylar fossa. In conclusion, condylar repair and remodeling can be obtained in these types of surgeries and the morphology of resected condyles after 1 year is quite close to normal macroscopic anatomy. © 2015, Universidad de la Frontera. All rights reserved.Ítem Acceso Abierto Nasal deformity in subjects with class III facial deformities [Deformidad nasal en sujetos con deformidad facial clase III](Universidad de la Frontera, 2015) Olate, S.; Cantín, M.; Muñoz, M.; Alister, J.P.; Vásquez, B.; Chaves Netto, H.Dentofacial deformities present some shades and variations that determine the inclusion of different anatomical components as part of the disease; the aim of this study was to ascertain the nasal characteristics in patients with a Class III dentofacial deformity. A descriptive study was conducted on 20 patients diagnosed with a Class III facial deformity and a surgical indication; frontal and lateral as well as CT images were taken to analyze variables of nasal morphology and deformities associated with the nasal bridge, tip and septum. The results showed that the nasal angles are outside normal parameters and that the basal width of the nose is approximately 3 mm smaller than the intercanthal width; 45% of the subjects have lateral deviations, 50% bridge deformity and 80% septum deviation. It is concluded that there are nasal deformities in subjects with a Class III facial deformity and that this component must be carefully evaluated in the preoperative stage. © 2015, Universidad de la Frontera. All rights reserved.