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Stock trays must meet various requirements in order to obtain a satisfactory impression. A good stock tray will: Be rigid enough to endure the force of the dental impression material being positioned in the mouth. Flexure of the tray under force would cause the tray to be distorted, so when the impression tray is removed the impression would be ...
Acrylics are used in the fabrication of dentures, artificial teeth, impression trays, maxillofacial / orthodontic appliances and temporary (provisional) restorations. They cannot be used as tooth filling materials because they can lead to pulpitis and periodontitis , as they may generate heat and acids during setting, and in addition they shrink.
Charles Stent (1807–1885) was a 19th-century English dentist notable for his advances in the field of denture making.. In 1847, English dentist Edwin Truman (1819–1905) introduced gutta-percha as a material for making dental impressions; however, this was unsatisfactory for several reasons, including its tendency to distort upon removal from the patient's mouth, and to shrink upon cooling.
Structure of dental inlays and onlays In dentistry, inlays and onlays are used to fill cavities, [ 1 ] and then cemented in place in the tooth . This is an alternative to a direct restoration , made out of composite, amalgam or glass ionomer , that is built up within the mouth.
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It is also used in other contexts where an impression similar to a dental impression is needed, such as in audiology (to take ear impressions for fitting custom hearing protection or hearing aids [2]) or in industrial applications (such as to aid in the inspection of interior features of machined parts, for example, internal grooves inside ...
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