Source: http://www.google.com/patents/US7816423?dq=6,219,045
Timestamp: 2013-12-12 16:57:09
Document Index: 793916010

Matched Legal Cases: ['Application No. 2002331604', 'Application No. 2', 'Application No. 2', 'Application No. 02815839', 'Application No. 02815839', 'Application No. 02', 'Application No. 2003']

Patent US7816423 - Hardenable self-supporting structures and methods - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsCompositions, particularly for forming dental products, having a hardenable self-supporting structure with sufficient malleability to be subsequently customized into a second shape and then hardened, and methods....http://www.google.com/patents/US7816423?utm_source=gb-gplus-sharePatent US7816423 - Hardenable self-supporting structures and methodsPublication numberUS7816423 B2Publication typeGrantApplication numberUS 12/250,309Publication dateOct 19, 2010Filing dateOct 13, 2008Priority dateAug 15, 2001Also published asCA2454617A1, CN1541084A, CN100415198C, EP1416902A1, EP2272485A2, EP2275077A2, US7674850, US20030114553, US20090032989, US20110003266, WO2003015720A1Publication number12250309, 250309, US 7816423 B2, US 7816423B2, US-B2-7816423, US7816423 B2, US7816423B2InventorsNaimul Karim, Todd D. Jones, Kevin M. Lewandowski, Duane D. Fansler, James M. Nelson, Marcelino Salviejo-Rivas, Babu N. Gaddam, Ahmed S. Abuelyaman, Sumita B. MitraOriginal Assignee3M Innovative Properties CompanyExport CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (39), Referenced by (3), Classifications (27), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetHardenable self-supporting structures and methodsUS 7816423 B2Abstract Compositions, particularly for forming dental products, having a hardenable self-supporting structure with sufficient malleability to be subsequently customized into a second shape and then hardened, and methods.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a divisional of U.S. application Ser. No. 10/219,398, filed Aug. 15, 2002, now pending, which claims the benefit of U.S. Provisional Application Ser. No. 60/312,355, filed on Aug. 15, 2001, the entirety of which is incorporated herein by reference.
FIELD OF THE INVENTION This invention relates to materials, particularly dental materials, and methods of making and using. These materials have sufficient internal strength to be formed into a desired shape that can be maintained during transportation and storage and with sufficient malleability to be subsequently customized into a second shape and then hardened. These materials can be used in a variety of applications, including oral prosthetic devices such as inlays, onlays, veneers, temporary crowns, permanent crowns, bridges, as well as fillings, orthodontic appliances, tooth facsimiles or splints, and dental impression trays.
BACKGROUND Restorative dentistry is an important market in today's dental industry. In particular, tooth repair with temporary and permanent crowns is a common procedure, typically requiring multiple dental appointments. Current technology uses pastes, two-part powder/liquid systems, preformed metal temporary crowns, and ceramic or porcelain/metal permanent crowns.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1. Rheological response of dental wax (Baseplate Wax All-Season #2 Pink, Patterson Dental Supply, St. Paul, Minn.). Solid symbols represent elastic modulus G′, while open symbols represent viscous modulus G″.
SUMMARY The present invention provides a composition that includes a resin system, a filler system, and an initiator system. The composition is in the form of a hardenable, self-supporting (i.e., free-standing) structure having a first shape. The self-supporting structure has sufficient malleability to be reformed into a second shape, thereby providing for simplified customization of a device, e.g., simplified customized fitting of a dental prosthetic device. Once reformed into a second shape, the composition can be hardened using, for example, a free radical curing mechanism under standard photopolymerization conditions to form a hardened composition with improved mechanical properties. Significantly, for the compositions of the present invention upon hardening the structure in the second shape, the hardened structure does not need an additional veneering material.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION The present invention provides a composition that includes a resin system, a filler system, and an initiator system in the form of a hardenable self-supporting (i.e., free-standing) structure having a first shape, preferably the shape of a dental crown. The resin system (one or more resins), filler system (one or more fillers), and initiator system (one or more initiators) are chosen such that: the composition can be relatively easily molded to form the initial self-supporting structure; the self-supporting structure maintains its first shape at room temperature for at least about two weeks (in the absence of conditions that activate the initiator system and in the absence of an external force other than gravity), and the self-supporting structure has sufficient malleability to be reformed into a second shape (preferably at a temperature of about 15� C. to 38� C., more preferably, at a temperature of about 20� C. to 38� C., and most preferably, at room temperature).
EXAMPLES The following examples are given to illustrate, but not limit, the scope of this invention. Unless otherwise indicated, all parts and percentages are by weight and all molecular weights are weight average molecular weight.
Test Methods Pre-Cure Elastic and Viscous Moduli (Rheology) Test
Starting Materials Resin A
Examples 1-14 and Comparative Example 1 (CE-1) Self-Supporting Light-Curable Composites Self-supporting, light-curable composites (Examples 1-14 and Comparative Example 1) were prepared according to the following procedure. The photoinitiator components were initially dissolved in bisGMA, UDMA, or bisGMA/UDMA/bis-EMS6/TEGDMA blend in a water bath. Then the ingredients (names and quantities for each example shown in Table 1) were weighed into a MAX 20 plastic mixing cup having a screw cap (Flakteck, Landrum, S.C.) and the closed cup heated in an oven at 85� C. for 30 minutes. The cup was placed in a DAC 150 FV speed mixer (Flakteck) and spin mixing carried out for 1 minute at 3000 rpm. The cup was then reheated for 30 minutes at 85� C. followed by another minute of mixing at 3000 rpm to afford the final blended composite. A similar blended composite was made without the photoinitiators (CPQ and EDMA) for ease of pre-cure physical property testing.
Example 15 Dental Impression Tray Preparation and Simulated Use A self-supporting, light-curable composite was prepared according to the procedure described in Examples 1-14 with the names and quantities for each ingredient used in this Example 15 shown in Table 1.
Examples 16-32 Self-Supporting Light-Curable Composites Self-supporting, light-curable composites (Examples 16-32) were prepared according to the procedure described for Examples 1-14 with the ingredient names and quantities for each example shown in Table 2).
Sample Evaluations (Examples 1-14, 16-32, and Comparative Example 1) Composite samples (Examples 1-14, 16-32, and Comparative Example 1) were evaluated for pre-cure elastic and viscous moduli, for pre-cure crown formation, and for post-cure flexural strength, flexural modulus, compressive strength, and diametral tensile strength according to the Test Methods described herein. All samples passed the Pre-Cure Crown Formation Test, except for the Comparative Example 1 sample that was very soft and not self-supporting. Results from the other evaluations are provided in Table 3 (Examples 1-14 and Comparative Example 1) and Table 4 (Examples 16-32).
Sample Evaluations (Crystallinity and Packability) In addition to the testing results provided in Tables 3 and 4; Examples 2, 3, 13, 14, 24, 25, and 26; and the commercial material REVOTEK LC Resin (GC Dental Products Corp., Japan) were confirmed to contain a crystalline component having a melting point above 20� C. when evaluated according to the Pre-Cure DSC Test Method described herein. A sample of the commercial material SUREFIL High Density Posterior Restorative (Dentsply) showed the presence of a crystalline component having a melting point below 20� C. That is, there is no crystalline component as defined herein. In contrast, DSC evaluations of Example 1 and the commercial materials PRODIGY Condensable Composite Restorative System (Kerr, Orange, Calif.) and TRIAD Visible Light Cure Provisional Material (Dentsply Caulk, Milford, Del.) suggested the absence of any crystalline component. The results of these DSC measurements are provided in Table 5. The Elastic Moduli (G′) and Viscous Modulit (G″) of the four commercial materials (according to the Test Method provided herein, except that samples were pressed without heating) are also provided in Table 5.
Sample Evaluation (Example 15) The composite sample from Example 15 was evaluated for post-cure flexural strength and flexural modulus according to the Test Method described herein. Following curing the resulting hard, tough material had the following flexural strength and modulus values that were very acceptable for a material to be used as a dental article, e.g., as a dental impression tray. Flexural Strength 66 MPa (Standard Deviation=5) and Flexural Modulus=915 MPa (Standard Deviation=115).
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Chem., 2000; A37(11):1317-1331.Referenced byCiting PatentFiling datePublication dateApplicantTitleWO2012015814A1Jul 26, 2011Feb 2, 20123M Innovative Properties CompanyKit of parts, method of producing and use thereofWO2012057917A1Aug 31, 2011May 3, 20123M Innovative Properties CompanyDental compositions comprising semi-crystalline resin and nanocluster fillerWO2013052271A1Sep 18, 2012Apr 11, 20133M Innovative Properties CompanyMethods of making an impression of dental tissue and dental articlesClassifications U.S. Classification523/109, 264/16, 524/401, 524/590, 264/19, 524/612, 524/81, 524/599International ClassificationC08L101/00, C08K3/00, C08K5/00, C08G18/02, C08G73/06, A61K6/083, C08G63/60, A61K6/08, A61K6/10, A61K6/09, C09D5/16Cooperative ClassificationA61K6/083, A61K6/0073, A61K6/087, A61K6/10European ClassificationA61K6/083, A61K6/00F1, A61K6/087, A61K6/10Legal EventsDateCodeEventDescriptionMar 1, 2011CCCertificate of correctionRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google