Compositions: coating or plastic – Coating or plastic compositions – Dental
Patent
1998-10-08
2000-07-18
Koslow, Melissa
Compositions: coating or plastic
Coating or plastic compositions
Dental
4332021, 4332011, 301 6, 301 32, 301 66, 301 64, 301 70, 301 72, C03C 1010, A61C 13683, A61C 1300
Patent
active
060901942
ABSTRACT:
A dental porcelain composition comprising a continuous glassy phase and a discontinuous, substantially uniform crystalline phase comprising cubic leucite. The porcelain exhibits coefficients of thermal expansion in the range of about 11 to about 17.times.10.sup.-6 /.degree. C. (measured from 25.degree. C. to 500.degree. C.) and fusion temperatures in the range of about 700.degree. C. to about 1200.degree. C. The porcelain composition of the present invention can be used to form dental restorations such as cores for all ceramic restorations. The cubic leucite phase is uniformly dispersed in the glass matrix and has an average grain size not exceeding about 4 .mu.m and about 95% of the leucite grains do not exceed about 8 .mu.m in diameter.
REFERENCES:
patent: 3236662 (1966-02-01), MacDowell
patent: 3723140 (1973-03-01), Beall et al.
patent: 3726695 (1973-04-01), Beall et al.
patent: 4604366 (1986-08-01), Kacicz et al.
patent: 4798536 (1989-01-01), Katz
patent: 5192722 (1993-03-01), Bedard et al.
patent: 5204077 (1993-04-01), Mori et al.
patent: 5994246 (1999-11-01), Denry
Hahn et al, "Importance of the glass Ceramic Syatem K20-Al203-SiO2 in Dental Porcelain", Ceramic Formum Int./Ber. Dt. Keram. Ges. vol. 57, No. 9-10, pp. 208-214, 1980 no month.
Denry IL, Holloway JA, Rosenstiel SF; Crystallization Kinetics of a Low-Expansion Feldspar Glass for Dental Applications; Journal of Biomedical Materials Research, (Sep. 5, 1998) 41 (3) 398-404.
Denry IL, Holloway JA, Rosenstiel SF;Effect of Ion-Exchange on the Crystallization Behavior of a Low Expansion Feldspar Glass; Journal of Dental Research (IADR Abstract No. 993) 138, 1997.
Denry IL, Mackert JR, Holloway JA, Rosenstiel SF; Effect of Cubic Leucite Stablization on the Flexural Strength of Feldspathic Dental Porcelain; Journal of Dental Research vol. 75(12): 1928-1935, Dec. 1996.
Hermansson EA, Carlsson R; On the Crystallization of the Glassy Phase in Whitewares, Transactions and Journal of the British Ceramic Society, vol. 77, 1978, pp. 32-35 XP002102546.
Martin RF, Lagache M; Cell Edges and Infrared Spectra of Synthetic Leucites and Pollucites in the System KalSi.sub.2 O.sub.6 -RbALSit.sub.2 O.sub.6 -CsAlSi.sub.2 O.sub.6 ; Canadian Mineralogist vol. 13, pp. 275-281 (1975).
Prasad A, Vaidyanathan TK; Crystallization of Cubic Leucite by Composition Additives+; Prepared for Presentation at the 19.sup.th Annual Session, American Association for Dental Research, Mar. 9, 1990.
Rouf MA, Hermansson L, Carlsson R; Crystallization of Glasses in the Primary Phase Field of Leucite in the K2O--AL2O3--SiO2 System; Transactions and Journal of the British Ceramic Society, vol. 77, 1978, 36-39, XP002102547.
Taylor D; Thermal Expansion Data XV. Complex Oxides with the Leucite Structure and Frameworks Based on Six-Membered Rings of Tetrahedra; Journal, vol. 90. No. 6, 197-204, 1991.
Taylor D, Henderson CMB; The Thermal Expansion of the Leucite Group of Minerals; The American Mineralogist, vol. 53, 1476-1489, Sep.-Oct., 1968.
Brodkin Dmitri
Panzera Carlino
Jeneric Pentron Incorporated
Knab Ann M.
Koslow Melissa
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