title: Passivity of conventional and CAD/CAM fabricated implant frameworks.
abstract: The objective of this research was to evaluate the passivity by measuring the passive fit and strain development of frameworks screwed on abutments, made by CAD/CAM technology, and to compare these parts with samples manufactured by conventional casting. Using CAD/CAM technology, four samples were made from zirconia (Zircad) and four samples were manufactured from cobalt-chrome (CoCrcad). The control groups were four specimens of cobalt-chrome, made by one-piece casting (CoCrci), with a total of 12 frameworks. To evaluate the passive fit, the vertical misfit at the abutment-framework interface was measured with scanning electron microscopy (250×) when only one screw was tightened. The mean strain in these frameworks was analyzed by photoelasticity test. A significant difference in the passive fit was observed between the control and sample groups. CoCrcad exhibited the best value of passive fit (48.76±13.45 µm) and CoCrci the worst (187.55±103.63 µm); Zircad presented an intermediate value (103.81±43.15 µm). When compared to the other groups, CoCrci showed the highest average stress around the implants (17.19±7.22 kPa). It was concluded that CAD/CAM-fabricated frameworks exhibited better passivity compared with conventionally fabricated frameworks. CAD/CAM-fabricated Co-Cr frameworks may exhibit better passive fit compared with CAD/CAM-fabricated zirconia frameworks. Even so, similar levels of stress were achieved for CAD/CAM-fabricated frameworks.
authors.affiliation: Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil.
authors.forename: Gabriela Monteiro
authors.initials: GM
authors.lastname: de Araújo
authors.affiliation: Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil.
authors.forename: Danilo Gonzaga Bernardo
authors.initials: DG
authors.lastname: de França
authors.affiliation: Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil.
authors.forename: João Paulo
authors.initials: JP
authors.lastname: Silva Neto
authors.affiliation: Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil.
authors.forename: Gustavo Augusto Seabra
authors.initials: GA
authors.lastname: Barbosa
mesh_terms: D017076:Computer-Aided Design; D000044:Dental Abutments; D015921:Dental Implants; D008855:Microscopy, Electron, Scanning; D011474:Prosthesis Design
chemical_list: D015921:Dental Implants