Browsing by Author "Carrillo Vaca, David Gerardo"

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    Relación entre anomalías en el complejo cráneo-cérvico-mandibular, disfunción temporomandibular y oclusión
    (Universidad de Cuenca, 2016) Bravo Torres, Wilson Daniel; Carrillo Vaca, David Gerardo; Trujillo Jaramillo, María Cristina
    Cráneo cervico mandibular complex has different degrees of mobility because it is placed above the upper and lower cervical spine which has independent movements one from another. This complex should work in harmony or “orthostatic stability” in order to avoid stressful movements which may hurt ligaments, muscles, and capsule from temporomandibular joint. There is the hypothesis that a wrong position of the mentioned complex can produce changes in dental occlusion, and also temporomandibular disorders, because of simultaneous activation of masticatory muscles, the consequence is changes in mandible, and hyoid bone. Recent evidence refuses that hypothesis because the human body has propioceptors to maintain an orthostatic stability from the complex's asymmetries, and avoid further damage.
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    Revisión sistemática de impresiones digitales Intraorales
    (2019) Carrillo Vaca, David Gerardo; Astudillo Ortiz, Jaime Leonardo
    Statement of the problem: Intraoral digital impressions may vary in precision and trueness (accuracy) between scanners, this issue needs to be studied. Objective: Analyze, and compare the characteristics of accuracy (precision and trueness) of intraoral digital impressions. Methods: A Medline/Pubmed and Cochcrane search was performed to identify relevant articles about precision and trueness in digital impressions. The search was limited to articles that describe the superimposition of STL files gained from a pattern for fixed partial prosthesis with an intraoral scanner. The articles were determined from the PICOS system recommended by the PRISMA guidelines. Results: Three studies accomplished the eligibility criteria. The scanners included, and their results respectively were: Bluecam: 12.7±2.6 um / 17.5±1.8 um, Omnicam: 12.5±3.7 um / 13.8±1.4 um. Carestream 3500: 0.014 mm / 13±1, Zfx Intrascan: 0.033 mm / 30±10-45, Bluecam: 0.029 mm / 22.5±25-30, Omnicam: 0.031 mm / 30±32.5-27.5, True definition: 0.011 mm / 10±2.5-7.5. E4D dentist: 97.6±109.2 um / 114.2±80.7 um, Fastscan: 26.0±24.4 um / 45.2±29.8 um, iTero: 25.8±22.5 um / 52.1±38.8 um, Trios: 13.0±12.1 / 49.7±36.6 um, Zfx Intrascan: 132.3±124.4 um / 89.4±64.2 um. The studies evaluated the precision and trueness from the superimposition of STL images they manage the results in microns, only one study managed the results in millimeters. Conclusions and implications: The superimposition demonstrated different values according to each scanner, scanners with better performance were: in precision Bluecam, Carestream 3500, Trios. While in trueness were: Omnicam, True Definition, Fastscan.