dental stone


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dental stone

A hemihydrate of gypsum divided into four classes according to the qualities resulting from differing methods of preparation. It is used in dentistry in the preparation of models and study casts.
See also: stone
Medical Dictionary, © 2009 Farlex and Partners

den·tal stone

(dentăl stōn)
Alpha form of calcium sulfate semihydrate with physical properties superior to those of the beta form (dental plaster); consists of cleavage fragments and crystals in the form of rods and prisms and is thereby denser than the beta form; can form a dense stonelike material when mixed with water; used to pour models (casts) of dental structures.
Medical Dictionary for the Dental Professions © Farlex 2012
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Type III dental stone was used by specialist (83%) and type II by 88% general dental practitioners.
Secondary impression was made with addition silicon and poured in type 5 dental stone. Design was transferred on to the obtained cast.
Water powder ratio plays its role as an important factor in the quality of gypsum materials12,13 many experiments have been done to improve mechanical properties of dental stone and they have main concerned towards the decrease of gauging water requirement.14,19
All the selected samples were initially subjected to oral prophylaxis, impressions were made with Alginate and casts were poured immediately with dental stone. The maxillary and mandibular models thus obtained were inspected and those with voids, cracks, fractures or irregularities were discarded.
Duplicate the trial denture in reversible hydrocolloid and pour the impression in dental stone. Make a clear template of the stone cast using a 0.3-mm thermoplastic sheet (Fig:1).
Border moulding was done with green stick or low fusing compound (DPI company, Mumbai, India) and secondary impression was made with monophase silicone impression material (Aquail, Dentsply, Germany) (Fig 5) Master cast was poured with Dental stone (Neelkanth Minecham, Rajasthan, India.) following beading and boxing of the border molded maxillary and mandibular special trays.
Impression was, then poured in type IV dental stone and the cast was obtained and removable dies were prepared.
Primary impressions of both the maxillary and mandibular edentulous arches were made using imprezzion compound (Azian acry1atez, Mumbai, India) and primary casts were poured with dental stone (Ctone P1azter, Nee1kanth Minechem, Rajazthan, India).
Rugae pattern was recorded by adding Addition silicone over impression material as it has high tear strength and better accuracy, optimum pressure was applied to make an impression of the upper dental arch for all the subjects and the impressions were then poured with Type 3 dental stone.
The implants copings were repositioned into the impression and cast was fabricated using dental stone (Fig 2B).
After taking detailed history and clinical examination an impression of each patient was recorded in alginate impression material and models were poured in dental stone. Measurements were done on dental casts for anterior open bite in millimeters (mm) with vernier caliper having least count of 0.01 mm.
Alginate impressions were taken for upper and lower arch, Casts were poured using dental stone over which appliance was fabricated by adapting 0.9mm stainless steel wire over the palate extending from molars on either side (upper first permanent molars).