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  • Title: The CAD/CAM Compound Prosthesis: Digital Workflow for Fabricating Cement-Retained Zirconia Prosthesis Over Screw-Retained Milled Titanium Bars.
    Author: Faeghinejad M, Proussaefs P, AlHelal A, Lozada J.
    Journal: Int J Periodontics Restorative Dent; 2019; 39(1):39-47. PubMed ID: 30543725.
    Abstract:
    The computer-assisted design/computer-assisted manufactured compound prosthesis involves designing and milling a cement-retained prosthesis over milled titanium bars. In the presented clinical case report, a diagnostic wax pattern was made to assess esthetics, contours, and occlusion. A total of eight maxillary root-form implants were restored by following the combined prosthesis design concept. The mandibular arch was restored with a screw-retained implant-supported zirconia fixed prosthesis. A milled polymethyl methacrylate (PMMA) maxillary interim prosthesis was fabricated to intraorally confirm the diagnostic wax pattern. The interim PMMA prosthesis was then scanned, and three screw-retained titanium milled bars were designed that provided the substructure of the definitive restoration. A cement-retained milled zirconia prosthesis was then designed and fabricated. The zirconia prosthesis provided the superstructure of the definitive complete-arch restoration. After confirming esthetics, phonetics, occlusion, and accessibility for oral hygiene, the superstructure was cemented with temporary cement to enable retrievability.
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