Setting and hygroscopic expansion of investments
نویسندگان
چکیده
منابع مشابه
[Hygroscopic expansion of some casting investments].
CREDIT is generally given to Taggart1 for introducing the cast gold inlay to the dental profession. Although he realized that gold shrinks when cooled from molten state to solid state of room temperature, the investment available to him did not supply sufficient compensation. In 1910, Van Horn2 published a paper dealing with a method by which he obtained the compensation by means of wax expansi...
متن کاملEffective Expansion: Balance between Shrinkage and Hygroscopic Expansion.
The purpose of this study was to investigate the relationship between hygroscopic expansion and polymerization shrinkage for compensation of polymerization shrinkage stresses in a restored tooth. One resin-modified glass-ionomer (RMGI) (Ketac Nano, 3M ESPE), 2 compomers (Dyract, Dentsply; Compoglass, Ivoclar), and a universal resin-based composite (Esthet•X HD, Dentsply) were tested. Volumetric...
متن کاملhygroscopic expansion of aesthetic restorative materials: one-year report
objective: to measure the long-term linear hygroscopic expansion (lhe) of several materials using bulked and layered techniques. materials and methods: seven materials were used; fuji cap ii, fuji ii lc, photac-fil aplicap, vitremer, dyract, tetric and z100. ten specimens (6×4 mm) were made for each material using layered and bulked techniques (each group comprises five specimens). the specimen...
متن کاملRelaxation of polymerization contraction shear stress by hygroscopic expansion.
We studied relaxation by hygroscopic expansion of the interfacial polymerization shear stress of bonded resin composites. In the experimental set-up, resin composite-cured-to-glass strips bent due to the polymerization shrinkage. The strips were stored wet or dry. The curvatures of the bent strips were recorded, by the scanning of the glass surfaces with a contact profilometer, periodically ove...
متن کاملHygroscopic Expansion of Aesthetic Restorative Materials: One-Year Report
OBJECTIVE To measure the long-term linear hygroscopic expansion (LHE) of several materials using bulked and layered techniques. MATERIALS AND METHODS Seven materials were used; Fuji Cap II, Fuji II LC, Photac-Fil Aplicap, Vitremer, Dyract, Tetric and Z100. Ten specimens (6×4 mm) were made for each material using layered and bulked techniques (each group comprises five specimens). The specimen...
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ژورنال
عنوان ژورنال: British Dental Journal
سال: 1970
ISSN: 0007-0610,1476-5373
DOI: 10.1038/sj.bdj.4802510