Veneer, inlay, onlay, overlay, crown, bridge anterior Rapid milling, Direct composite reparation, Mechanical properties Lithium Disilicate and Zirconia-Reinforced Lithium SilicatesĬlinical experience, Esthetics, Wide range shade, TranslucidityĬlinical experience (e.max), Esthetic, Mechanical strength, Wide range shade, Translucidity The purpose of this article is to offer a quick, summary overview of these constantly evolving materials, which today propose diverse restoration methods to the clinician.įeldspathic and Leucite-Reinforced Ceramic The CAD/CAM chairside system represents only the production process, while the clinical outcome of the restoration is mainly influenced by the type of material chosen to carry out the restoration and the way in which it is managed. Each category offers mechanical and physical features and unique indications for specific clinical applications. ĬAD/CAM materials for chairside production can be classified according to the composition of the materials ( Table 1). Benefits are easy intraoral repair with light-cured restoratives and a faster production rate since firing is not needed. Recently CAD/CAM resin composite and hybrid ceramic materials have been introduced. Indeed, digital anatomical modeling allows having minimal thicknesses avoiding the main mechanical complication of “bi-layer” systems (i.e., the chipping of coating ceramics). In chairside technology, the use of monolithic materials is preferred. Nevertheless, a post-milling crystallization is mandatory to access the final shade and the proper mechanical strength. Some of the aforementioned materials could be found in a pre-crystallized stage in order to guarantee rapid milling. Examples of these microstructures are leucite, lithium disilicate glass-ceramics, and zirconia. Then, the need for superior mechanical properties induced the development of new materials that could extend the indications of CAD/CAM restorations (onlays, crown). Feldspathic ceramics were modified in order to be used for small occlusal inlays. įor the first 15 years or so, the feldspathic ceramics (Vita Mark I, Vita Zahnfabrick, Bad Sackingen, Germany) was the only one available for CEREC. Nowadays, the main chairside systems (e.g., PlanScan, Carestream, or CEREC) are using a “full-digital workflow”, which can produce different prosthetic devices such as inlays/onlays, veneers, endo-crowns, bridge crowns, and implant abutments, to name some. The first generation of CAD/CAM machinery appeared in the market in the 1980s, and it was only able to design and produce ceramic indents. Restoration production is designed using subtractive manufacturing processes, which require milling the desired restoration starting from a block of material.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |