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Dental releasing materials

a technology of releasing materials and dentures, applied in the field of dental releasing materials, can solve problems such as bulk fractures, and achieve the effect of enhancing the strength of composite materials

Inactive Publication Date: 2006-11-30
ADA FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] Briefly, the present invention comprises new composites that contain nano-sized calcium phosphate fillers and / or fluoride releasing fillers for substantial calcium (Ca2+) and phosphate (PO4) release and / or F− release, together with reinforcement fillers to provide superior strength and fracture toughness. Current dental composites include either stress-bearing composites or releasing composites. Stress-bearing composites in the prior art have flexural strength of 80-120 MPa, but have no release. They can survive in moderate stress-bearing applications, but they experience bulk fracture in large stress-bearing restorations. Releasing composites in the prior art use the same releasing fillers as reinforcement which provide poor or no reinforcement, and hence they have strengths of 30-70 MPa.
[0027] A further object of the invention is to provide such composites which enable controlled release of therapeutic materials in combination with materials in a resin matrix which enhance strength of the composite.

Problems solved by technology

They can survive in moderate stress-bearing applications, but they experience bulk fracture in large stress-bearing restorations.

Method used

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Examples

Experimental program
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Effect test

example 1

[0072] Nano MCPM particles. In this example, nano-sized MCPM (monocalcium phosphate monohydrate, Ca(H2PO4)2.H2O) particles are used as fillers to make dental releasing materials. The nano MCPM powder can be prepared by using a spray drying process or other suitable processes. The spray drying apparatus consists of a spray nozzle situated on the top of a glass column, which is heated with electrical heating tapes and thermally insulted. The water in the diluted Ca—P solution are evaporated into the dry, heated air in the column and expelled from the precipitator into a hood. The fine particles suspended in the flow are trapped in the precipitator and collected at the end of the process. The solution for making nano MCPM is prepared by dissolving CaCO3 in a H3PO4 diluted solution (8 mM Ca and 16 mM PO4). While this process serves as an example, nano MCPM from other processes can also be used as fillers for dental materials.

[0073] Examples of nano MCPM particles thus produced are show...

example 2

[0074] Nano DCPA particles. In this example, nano-sized DCPA (dicalcium phosphate anhydrous, CaHPO4) particles are used as fillers in dental materials. Nano DCPA can be made by using a method similar to that described in Example 1 as well as by other suitable methods. For nano DCPA, the solution being sprayed contains an acid component to solubilize the calcium phosphate compound. The DCPA-saturated solution that is used in the spray drying process is prepared by dissolving commercial DCPA in a dilute acetic acid (16 mmol / L) solution (8 mM Ca and PO4). While this process serves as an example, nano DCPA from other processes can also be used as fillers for dental materials.

[0075] Examples of nano DCPA particles thus produced are shown in the TEM micrograph in FIG. 2A. The particle sizes range from about 50 nm to 200 nm. Some nano particles appear to be connected to form a fibrous structure. The thickness of the fibrous structure is about 50 nm, and the length of the fibrous structure...

example 3

[0076] Direct-filling nano MCPM composites with HEMA. An example of manufacture of this invention comprises direct-filling composites containing nano MCPM and a strengthener. The strengthener can be glasses, ceramics, metals, polymers and mixtures thereof. They can be fibers, particulates or whiskers. As an example of using a strengthener, silicon carbide (SiC) fillers are used with an elongated shape having a diameter of 0.1-3 μm with a mean of 0.9 μm, and a length of 2-100 μm with a mean of 14 μm. SiC is mixed with silica (SiO2) having a particle size of 40-70 nm, at a SiC:silica mass ratio of 5:1, to serve as an example. The mixed powder is heat-treated at a temperature of 800° C. for 30 min. The powder is silanized as usual by mixing it with mass fractions of 4% 3-methacryloxypropyltrimethoxysilane (MPTMS) and 2% n-propylamine in cyclohexane in a rotary evaporator. The silanized nano-silica-SiC fillers are referred to as SiC strengthener. The strengthener is mixed with nano MCPM...

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Abstract

Combining nanosized particles of a source of desired dental restorative, repair or therapeutic materials with strengthening agents in various generally nanosized form such as whiskers, fibers, particles and the like in a resin matrix provides a highly strain resistant composite which more effectively releases the therapeutic agents. The utilization of nano sized particles of the therapeutic agent in the combination enables observation of significantly improved therapeutic results.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation-in-part application of previously filed utility application Ser. No. 11 / 138,182, filed May 26, 2005, entitled DENTAL RELEASING MATERIALS for which is claimed and which is incorporated herewith by reference. BACKGROUND OF THE INVENTION [0002] In a principal aspect the present invention relates to two major problems facing current dental composites; namely, secondary caries and bulk fracture. The invention is directed to new dental materials that overcome these problems by being extremely strong mechanically to resist fracture and by being able to simultaneously release agents to combat caries. [0003] Specifically, an object of the invention is to (1) provide new dental materials having nano calcium phosphate and / or other fillers capable of substantial release of calcium, phosphate and / or fluoride to combat tooth decay; (2) tailor the nano releasing filler / strengthening filler ratio and the fast releasing filler / slo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K6/08A61K6/884
CPCA61L27/44A61L27/54A61L2400/12A61L2300/624A61L2300/112
Inventor XU, HUAKUNSUN, LIMINTAKAGI, SHOZOCHOW, LAURENCE C.
Owner ADA FOUND
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