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As the impression material is very similar to the casting material to be used, it requires the incorporation of a separating medium (e.g. sodium alginate) to aid in separating the cast from the impression. If a special tray is to be used, impression plaster requires 1–1.5mm spacing for adequate thickness. Advantages: [2] Hydrophilic
Between the direct and indirect, the direct digital impression technique was statistically more accurate, they showed significantly better inter-proximal contact. [6] The entire process proved to be more time efficient for both the dentist and patient in comparison with conventional methods or taking impressions with silicone impressions and ...
They are used in prosthodontics (to make dentures), orthodontics, restorative dentistry, dental implantology and oral and maxillofacial surgery. [3]: 136–137 Because patients' soft-tissue undercuts may be shallow or deep, impression materials vary in their rigidity in order to obtain an accurate impression.
CAD-CAM (aka Computer Aided Design-Computer Aided Manufacture) is a fabrication method which aids the production of dental restorations e.g. crowns, bridges, inlays and onlays. It is possible for these indirect restorations to be provided in one visit. [25] This works by first taking an intra-oral scan to produce a 3D virtual impression.
Crowns are used to improve the strength or appearance of teeth and to halt deterioration. While beneficial to dental health, the procedure and materials can be costly. The most common method of crowning a tooth involves taking a dental impression of a tooth prepared by a dentist, then fabricating the crown outside of the mouth. The crown can ...
Longer time in the dental chair may test the patience of children, making the procedure more difficult for the dentist. Due to the longer time involved, the fee charged by a dentist for a composite restoration may be higher than for an amalgam restoration. [18] Costs: Composite restoration cases generally have limited insurance coverage.
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