COMPARATIVE ANALYSIS BETWEEN 3D-PRINTED MODELS DESIGNED WITH GENERIC AND DENTAL-SPECIFIC SOFTWARE

Con la gran demanda en el mercado de nuevos softwares dentales, se ha visto la necesidad de realizar un estudio de precisión para aplicaciones en odontología digital, para lo cual no existe un estudio comparativo, y existe un desconocimiento generalizado respecto a sus aplicaciones. El propósito de este estudio fue investigar las diferencias de precisión entre las impresiones digitales obtenidas utilizando el software genérico G-CAD (CAD general) y D CAD (CAD dental). Nuestra hipótesis es que no existe una diferencia significativa entre el software para uso dental específico y general. Métodos: Se digitalizó un tipodonto con un escáner intraoral y los modelos obtenidos se exportaron en formato STL a cuatro softwares diferentes (Autodesk MeshMixer 3.5, Exocad Dental, Blender for dental e InLAB). Los archivos STL obtenidos por cada software se materializaron mediante una impresora 3D. Los modelos impresos fueron escaneados y exportados en archivos STL, con los que se formaron seis pares de grupos. Los grupos se compararon utilizando el software de análisis (3D Geomagic Control X) superponiéndolos en el orden de alineación inicial y utilizando el método de mejor ajuste. Resultados: No hubo diferencias significativas entre los cuatro tipos de software analizados; sin embargo, el grupo 4, compuesto por la combinación de D-CAD (Blender–InLAB), obtuvo el promedio más alto (−0,0324 DE = 0,0456), con una mayor precisión en comparación con el grupo con menor promedio (grupo 5, compuesto por la combinación de los modelos Meshmixer y Blender), un software genérico y un software específico (0,1024 DE = 0,0819). Conclusión: Aunque no se encontró evidencia de diferencias significativas con respecto a la precisión de los modelos 3D producidos por G-CAD y D-CAD, las combinaciones de grupos donde estaba presente un software de diseño dental específico mostraron una mayor precisión (precisión y veracidad) además evidenció una mayor tolerancia en los grupos utilizando D-CAD.With the great demand in the market for new dental software, it has become necessary to carry out a study of precision for digital dentistry applications, for which there is no comparative study, and there is a general lack of knowledge regarding its applications. The purpose of this study was to investigate the differences in accuracy between digital impressions obtained using the generic software G-CAD (general CAD) and D CAD (dental CAD). Our hypothesis is that there is no significant difference between the software for specific and general dental use. Methods: A typodont was digitized with an intraoral scanner and the models obtained were exported in STL format to four different software programs (Autodesk MeshMixer 3.5, Exocad Dental, Blender for dental and InLAB). The STL files obtained by each software were materialized using a 3D printer. The printed models were scanned and exported into STL files, from which six pairs of groups were formed. The groups were compared using the analysis software (3D Geomagic Control X) by superimposing them in the initial alignment order and using the best fit method. Results: There were no significant differences between the four types of software analyzed; however, group 4, composed of the combination of D-CAD (Blender-InLAB), obtained the highest average (-0.0324 SD = 0.0456), with a higher accuracy compared to the group with the lowest average (group 5, composed of the combination of the Meshmixer and Blender models), a generic software and a specific software (0.1024 SD = 0.0819). Conclusion: Although no evidence of significant differences was found with regard to the accuracy of the 3D models produced by G-CAD and D-CAD, the combinations of groups where specific dental design software was present showed greater accuracy (precision and accuracy) and also showed greater tolerance in the groups using D-CAD.0000-0003-0555-357

Radiological Society of North America (RSNA) 3D printing Special Interest Group (SIG): Guidelines for medical 3D printing and appropriateness for clinical scenarios

Este número da revista Cadernos de Estudos Sociais estava em organização quando fomos colhidos pela morte do sociólogo Ernesto Laclau. Seu falecimento em 13 de abril de 2014 surpreendeu a todos, e particularmente ao editor Joanildo Burity, que foi seu orientando de doutorado na University of Essex, Inglaterra, e que recentemente o trouxe à Fundação Joaquim Nabuco para uma palestra, permitindo que muitos pudessem dialogar com um dos grandes intelectuais latinoamericanos contemporâneos. Assim, buscamos fazer uma homenagem ao sociólogo argentino publicando uma entrevista inédita concedida durante a sua passagem pelo Recife, em 2013, encerrando essa revista com uma sessão especial sobre a sua trajetória

Radiological Society of North America (RSNA) 3D printing Special Interest Group (SIG): guidelines for medical 3D printing and appropriateness for clinical scenarios

Abstract Medical three-dimensional (3D) printing has expanded dramatically over the past three decades with growth in both facility adoption and the variety of medical applications. Consideration for each step required to create accurate 3D printed models from medical imaging data impacts patient care and management. In this paper, a writing group representing the Radiological Society of North America Special Interest Group on 3D Printing (SIG) provides recommendations that have been vetted and voted on by the SIG active membership. This body of work includes appropriate clinical use of anatomic models 3D printed for diagnostic use in the care of patients with specific medical conditions. The recommendations provide guidance for approaches and tools in medical 3D printing, from image acquisition, segmentation of the desired anatomy intended for 3D printing, creation of a 3D-printable model, and post-processing of 3D printed anatomic models for patient care.https://deepblue.lib.umich.edu/bitstream/2027.42/146524/1/41205_2018_Article_30.pd

Development of a computer-aided design software for dental splint in orthognathic surgery

In the orthognathic surgery, dental splints are important and necessary to help the surgeon reposition the maxilla or mandible. However, the traditional methods of manual design of dental splints are difficult and time-consuming. The research on computer-aided design software for dental splints is rarely reported. Our purpose is to develop a novel special software named EasySplint to design the dental splints conveniently and efficiently. The design can be divided into two steps, which are the generation of initial splint base and the Boolean operation between it and the maxilla-mandibular model. The initial splint base is formed by ruled surfaces reconstructed using the manually picked points. Then, a method to accomplish Boolean operation based on the distance filed of two meshes is proposed. The interference elimination can be conducted on the basis of marching cubes algorithm and Boolean operation. The accuracy of the dental splint can be guaranteed since the original mesh is utilized to form the result surface. Using EasySplint, the dental splints can be designed in about 10 minutes and saved as a stereo lithography (STL) file for 3D printing in clinical applications. Three phantom experiments were conducted and the efficiency of our method was demonstrated.10 pages, 10 figures, 1 table, 18 referencesstatus: publishe