Compositions: coating or plastic – Coating or plastic compositions – Dental
Reexamination Certificate
1999-10-28
2004-05-04
Koslow, C. Melissa (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Dental
C523S113000, C523S114000, C523S115000, C523S116000, C523S117000, C106S401000, C106S425000, C106S426000, C106S428000, C106S461000, C106S479000, C106S481000, C106S436000, C106S442000, C106S450000, C106S454000, C106S456000, C106S459000
Reexamination Certificate
active
06730156
ABSTRACT:
FIELD OF THE INVENTION
The invention relates broadly to fillers containing inorganic oxide particles for use in dental materials. Specifically, the fillers of the invention are clusters comprising a plurality of at least two amorphous, inorganic oxides: non-heavy metal oxide particles and a heavy metal oxide. The fillers mixed in a hardenable resin provide radiopaque dental materials that have high strength, good aesthetic character, and good retention of polish.
BACKGROUND
Dental materials generally have unique requirements as compared to the broad spectrum of composite materials. For health reasons, dental materials should be suitable for use in the oral environment. In certain instances, durability of a dental material is important to ensure satisfactory performance. For example, dental work that is performed at dentition locations where mastication forces are generally great, high strength and durability is desirable. In other instances, aesthetic character or quality is highly desired. This is often the case where dental work is performed at locations where a tooth repair or restoration can be seen from a relatively short distance.
Strength of a dental material is typically a result of the addition of fillers. Generally, to provide a dental material possessing greater mechanical strength characteristics, a material is filled or loaded with larger sized particles; i.e. particles that are generally greater than about 0.4 micrometers in diameter. These materials are often referred to as hybrid composites. A disadvantage to these composites, however, is their tendency to lack luster and aesthetic character, especially after exposure to repetitive tooth brushing, a requirement for good oral hygiene.
It is generally desired that the dental restorative material blend well with the surrounding dentition and looks life-like. Aesthetic quality in dental materials is typically achieved by creating material that has tooth-like colors/shades. “Microfills,” a certain class of dental materials, tend to have some luster, to better replicate tooth appearance. One example of a “microfill” is commercially available under the trade designation SILUX PLUS (3M Co., St. Paul, Minn.). Microfills, however, generally have less mechanical strength than hybrid composites or “macrofills.”
Radiopacity of a dental material can be useful in dentistry. Radiopaque composites can be examined using standard dental X-ray equipment, thereby facilitating long term detection of marginal leakage or caries in tooth tissues adjacent to a cured composite. U.S. Pat. No. 4,503,169 describes a radiopaque, low visual opacity (i.e. translucent) dental composite with non-vitreous zirconia-silica microparticles made by a sol-gel process. The process involves a sintering step followed by milling of the fired filler.
SUMMARY OF THE INVENTION
The invention provides fillers useful in dental materials to provide strong, highly aesthetic, radiopaque materials. Advantageously, the fillers in a hardenable resin provide dental materials that able to retain their polish after repetitive abrasive contact. The filler comprises a substantially amorphous cluster of non-heavy metal oxide particles and a heavy metal oxide, where the cluster has an average diameter of less than about 5 &mgr;m. More preferably the cluster has an average diameter of less than 2 &mgr;m.
“Hardenable” is descriptive of a material that can be cured or solidified e.g., by heating to remove solvent, heating to cause polymerization, chemical crosslinking, radiation-induced polymerization or crosslinking, or the like.
“Non-heavy metal oxide” means any oxide of elements other than those of heavy metals.
“Heavy metal oxide” means an oxide of metals having an atomic number greater than 28.
In one aspect of the invention, the non-heavy metal oxide particles are silica particles.
In another aspect of the invention, the heavy metal oxide is zirconium oxide.
In yet another aspect of the invention, the filler can be loaded into a hardenable resin to provide dental materials having radiopacity, low visual opacity, high mechanical strength and high aesthetic character.
In a further aspect of the invention, the fillers of the invention can be used in dental materials such as adhesives, artificial crowns, anterior or posterior fillings, casting materials, cavity liners, cements, coating compositions, mill blanks, orthodontic devices, restoratives, prostheses, and sealants.
REFERENCES:
patent: 2984628 (1961-05-01), Alexander et al.
patent: 3018262 (1962-01-01), Schroeder
patent: 3066112 (1962-11-01), Bowen
patent: 3117099 (1964-01-01), Proops et al.
patent: 3442817 (1969-05-01), Luebke
patent: 3514252 (1970-05-01), Levy, Jr. et al.
patent: 3539533 (1970-11-01), Lee et al.
patent: 3629187 (1971-12-01), Waller
patent: 3708296 (1973-01-01), Schlesinger
patent: 3709706 (1973-01-01), Sowman
patent: 3709866 (1973-01-01), Waller
patent: 3729313 (1973-04-01), Smith
patent: 3741769 (1973-06-01), Smith
patent: 3751399 (1973-08-01), Lee et al.
patent: 3766132 (1973-10-01), Lee et al.
patent: 3808006 (1974-04-01), Smith
patent: 3860556 (1975-01-01), Taylor
patent: 4002669 (1977-01-01), Gross et al.
patent: 4069055 (1978-01-01), Crivello
patent: 4071424 (1978-01-01), Dart et al.
patent: 4115346 (1978-09-01), Gross et al.
patent: 4216288 (1980-08-01), Crivello
patent: 4250053 (1981-02-01), Smith
patent: 4250311 (1981-02-01), Crivello
patent: 4259117 (1981-03-01), Yamauchi et al.
patent: 4292029 (1981-09-01), Craig et al.
patent: 4308190 (1981-12-01), Walkowiak et al.
patent: 4327014 (1982-04-01), Kawahara et al.
patent: 4379695 (1983-04-01), Orlowski et al.
patent: 4387240 (1983-06-01), Berg
patent: 4389497 (1983-06-01), Schmitt et al.
patent: 4394403 (1983-07-01), Smith
patent: 4404150 (1983-09-01), Tsunekawa et al.
patent: 4427799 (1984-01-01), Orlowski et al.
patent: 4503169 (1985-03-01), Randlev
patent: 4544359 (1985-10-01), Waknine
patent: 4545924 (1985-10-01), Ritter, II
patent: 4612138 (1986-09-01), Keiser
patent: 4617327 (1986-10-01), Podszun
patent: 4619817 (1986-10-01), Stambaugh et al.
patent: 4642126 (1987-02-01), Zador et al.
patent: 4649165 (1987-03-01), Kuhlmann
patent: 4652274 (1987-03-01), Boettcher et al.
patent: 4661540 (1987-04-01), Le et al.
patent: 4696955 (1987-09-01), Kuhlmann
patent: 4719091 (1988-01-01), Wusirika
patent: 4737593 (1988-04-01), Ellrich et al.
patent: 4746685 (1988-05-01), Masuhara et al.
patent: 4769351 (1988-09-01), Soumiya et al.
patent: 4772511 (1988-09-01), Wood et al.
patent: 4772530 (1988-09-01), Gottschalk et al.
patent: 4778671 (1988-10-01), Wusirika
patent: 4784794 (1988-11-01), Kato
patent: 4868288 (1989-09-01), Meier
patent: 4874450 (1989-10-01), Gottschalk
patent: 4886624 (1989-12-01), Gradeff et al.
patent: 4923905 (1990-05-01), Masuhura et al.
patent: 4927560 (1990-05-01), Osaka et al.
patent: 4931414 (1990-06-01), Wood et al.
patent: 4946665 (1990-08-01), Recasens et al.
patent: 4954414 (1990-09-01), Adair et al.
patent: 4985229 (1991-01-01), Obitsu et al.
patent: 4985340 (1991-01-01), Palazzotto et al.
patent: 5037579 (1991-08-01), Matchett
patent: 5055372 (1991-10-01), Shanklin et al.
patent: 5057393 (1991-10-01), Shanklin et al.
patent: 5073476 (1991-12-01), Meier et al.
patent: 5084586 (1992-01-01), Farooq
patent: 5089536 (1992-02-01), Palazzotto
patent: 5124417 (1992-06-01), Farooq
patent: 5190583 (1993-03-01), Menzel et al.
patent: 5234870 (1993-08-01), Osaka et al.
patent: 5275759 (1994-01-01), Osaka et al.
patent: 5332429 (1994-07-01), Mitra et al.
patent: 5460701 (1995-10-01), Parker et al.
patent: 5470910 (1995-11-01), Spanhel et al.
patent: 5545676 (1996-08-01), Palazzotto et al.
patent: 5558849 (1996-09-01), Sharp
patent: 5593781 (1997-01-01), Nass et al.
patent: 5609675 (1997-03-01), Noritake et al.
patent: 5643497 (1997-07-01), Kaga et al.
patent: 5648407 (1997-07-01), Goetz et al.
patent: 5658376 (1997-08-01), Noguchi et al.
patent: 5698483 (1997-12-01), Ong et al.
patent: 5760126 (1998-06-01), Engle et al.
patent: 5776239 (1998-07-01), Bruno
patent: 5830242 (1998-11-01), Yao
patent: 5856373 (1999-01-01), Kaisaki et al
Mitra Sumita Basu
Rusin Richard Paul
Windisch Mark Steven
Zhang Xiaodong
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