53. CAD/CAM technology in fixed partial dentures fabrication.
Covers how a fixed bridge framework is designed on screen and then milled or printed, following the workflow from intraoral or cast scanning through design, manufacture, sintering and veneering to try-in and cementation. It includes a table comparing zirconia, lithium disilicate, cobalt-chromium, titanium and PMMA with their uses, a step-by-step workflow table, design points on connector size and preparation, and a table setting out advantages and limits of the technique.
Topic 53 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 5 sections, about 96 words (2 min of reading), with 13 flashcards.
In this note
Introduction
Workflow
Materials for CAD/CAM bridges
Design points
Advantages and limits
Introduction
CAD/CAM technology lets a whole bridge framework be designed on screen and milled or printed by machine. It is used for crowns, bridges, implant abutments and partial-denture frameworks, from single units to long-span bridges.
Design points
Connector size matters even more than in metal: ceramic frameworks need much taller and wider connectors. The software warns when the minimum is not met.
Pontic and retainer support: frameworks give even support to the veneer, with no unsupported porcelain.
Preparations: rounded, smooth, with clear margins the scanner can read; no sharp edges the burs can't follow.
Cement space is set digitally.
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