Milling blank for dental products

Abstract

The utility model relates to a milling blank for a dental product, which comprises a fastening part (1) and a part (2) to be milled, and a concave part for attaching the part to be milled is arranged in the fastening part.

Description

Technical Field

[0001] The utility model relates to a milling blank for dental products. The milling blank comprises a fastening part and a part to be milled. Background Art

[0002] Milled blanks are used in various technical fields and in dentistry in particular for the production of root canal posts and crowns. In particular, milled blanks are used in computer-aided design (CAD) and in computer-aided manufacturing (CAM).

[0003] The milling blank typically comprises a metal fastening part which can be attached to a milling device. On the fastening part is arranged the part to be milled which can be made of plastic, a composite material comprising plastic and fiber or a ceramic material, for example.

[0004] Typically, the part to be milled has the shape of a cube or a cuboid, and the surface of the part to be milled facing the fastening part and the surface of the fastening part facing the part to be milled are substantially the same size. This ensures a reliable connection between the fastening part and the part to be milled, so that the part to be milled will remain firmly in place during milling. Once milling is completed, the product is removed from the fastening part, for example by cutting. Thereafter, the fastening part can be reused, or the material of the fastening part can be recycled.

[0005] The fastening parts are typically standardized so that they can be adapted to different milling devices without problems. Their dimensions are therefore usually the same for all manufacturers.

[0006] The milling blanks of the prior art are well suited for products having a volume close to that of the part to be milled. However, when the product to be manufactured has a volume significantly smaller than that of the part to be milled, a considerable proportion of the part to be milled is wasted and, moreover, milling takes a considerable amount of time. On the other hand, when the surfaces of the part to be milled and the fastening part facing each other are as large as possible, milling is easier and the finished product is as reliable and precise as desired.

[0007] It is therefore an object of the present invention to provide a milling blank which is suitable for milling small or thin parts while keeping the milling simple and the final product as reliable as desired. Utility Model Content

[0008] The milling blank for dental products according to the present disclosure comprises a fastening portion and a portion to be milled, a recess for attachment of the portion to be milled is arranged in the fastening portion, the recess has the size and shape of the fastening end of the portion to be milled, and the portion to be milled is placed and fastened in the recess, so that the portion to be milled has a fastening end intended to be placed in the recess of the fastening portion and another opposite end.

[0009] In one embodiment, the part to be milled is a composite material rod.

[0010] In one embodiment, the cross-section of the composite rod is circular, oval or rectangular.

[0011] In an embodiment, the portion to be milled is attached to the recess of the fastening portion with glue.

[0012] In an embodiment, the portion to be milled is attached to the recess of the fastening portion by friction.

[0013] In one embodiment, the dental product is a root canal post or post. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A milling blank according to an embodiment of the invention is shown in a side view.

[0015] Figure 2 A milled blank according to an embodiment of the invention is shown in end view. DETAILED DESCRIPTION

[0016] The utility model relates to a milling blank for a dental product, wherein the milling blank comprises a fastening part and a part to be milled. The fastening part comprises a recessed part for attaching the part to be milled.

[0017] In the milling blank according to the utility model, the fastening part has a recess, which basically has the size and shape of the fastening end of the part to be milled, and the part to be milled can be placed and fastened in the recess. Therefore, the part to be milled has a fastening end and another opposite end intended to be placed in the recess of the fastening part. Typically, the part to be milled is longitudinal in shape, that is, its length is significantly greater than its maximum diameter. The cross-section of the part to be milled can, for example, have a circular, oval, square or rectangular shape. The cross-section can be, for example, circular in shape, that is, the part to be milled has the shape of a straight cylinder with a circular base. The cross-section can also be oval or rectangular, in which case the recess has substantially the same form. This non-circular shape may be advantageous because the part to be milled will not be distorted in the recess.

[0018] Thus, by using the milling blank of the utility model, it is possible to manufacture, for example, root canal posts without significant waste of material and faster than conventional methods. When the part to be milled is attached to the recess of the fastening part, the part to be milled is reliably held in place during milling. This also enables the use of standardized fastening parts without problems.

[0019] According to an embodiment, the part to be milled is a composite rod comprising fibers arranged longitudinally along the rod, and a polymer. The length of the composite rod can be, for example, 10 mm to 25 mm, typically 15 mm to 20 mm, and its diameter can be, for example, 2 mm to 10 mm, typically 4 mm to 6 mm. In the case of a non-circular cross section, the diameter refers to the largest dimension of the cross section.

[0020] The composite rod may contain, for example, 2% to 65% volume percent (volume-%) of fibers. The amount of fibers in the composite material may be, for example, from 2%, 3%, 4%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60% volume percent to 3%, 4%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60% or 65% volume percent of the composite material. A preferred range of the amount of fibers is 2% to 35% volume percent.

[0021] The fibers may be selected from inert glass fibers, bioactive glass fibers, sol-gel processed silica fibers, any other silica-based fibers, alumina fibers, zirconia fibers, apatite fibers and quartz fibers. Mixtures of different fibers may also be used. Thus preferably, the fibers are inorganic fibers.

[0022] The fibers may be surface treated to allow them to better adhere to the surrounding polymer matrix. Such surface treatments are known in the art.

[0023] The diameter of the fibers may vary in the range of 0.1 μm to 100 μm. Thus the diameter may be, for example, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 4.0 μm, 5.0 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm or 95 μm. The upper limit of the diameter of the composite material can be 100 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 750 μm, 800 μm, 850 μm, 900 μm, 950 μm or 100 μm. Some preferred ranges are, for example, 1 μm to 30 μm and 10 μm to 25 μm. Fibers of more than one diameter can also be used in the composite material.

[0024] According to a preferred embodiment, the fibers in the composite material are long, continuous fibers and are substantially parallel to the longest dimension of the portion to be milled, i.e., they are longitudinal relative to the rod. However, the fibers may also be arranged in the composite material in the form of twisted bundles, or the portion to be milled may contain staple fibers (i.e., short fibers), such that the inner layer is continuous fibers and the outer layer is staple fibers, or such that the continuous and staple fibers form a layered structure in the longitudinal direction of the rod.

[0025] The polymer forms the matrix of the composite material, and the amount of the matrix in the composite material can be, for example, 20% to 98% by volume of the composite material. The amount of the matrix in the composite material can be, for example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95% by volume of the composite material to an upper limit of 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 98% by volume.

[0026] The matrix can be a polymer, and its monomers can be selected from the following group: methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate, tetrahydrofuran methacrylate, benzyl methacrylate, ethyl morpholine methacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate (TEGDMA), diurethane dimethacrylate, bisphenol A glycidyl methacrylate (2,2-bis(4-(2-hydroxy-3-methacryloxy)phenyl)propane, 2,2′-bis[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane, BisGMA), methacrylate functionalized dendrimers, other methacrylated hyperbranched oligomers and mixtures thereof. The matrix may also be made of epoxy resins, or of cross-linkable monomers or polymers such as ε-caprolactone, polycaprolactone, polylactic acid, polyhydroxyproline and other biopolymers, as well as of polyamides, polyurethanes, polyethylene, polypropylene and other polyolefins.

[0027] Composite materials can also include fillers that are usually in the form of particles. Here, "particles" refer to a form in which no (dimensional) size is significantly larger than another (dimensional) size. Filler particles can be bioactive or inert, and both can be used. Fillers can be, for example, oxides of bioactive glass, silicon (Si), calcium (Ca), phosphorus (P), barium (Ba), magnesium (Mg), potassium (K), sodium (Na) or titanium (Ti) or other compounds of fluorine (F) or these elements, color pigments, inert ceramics, hydroxyapatite or other calcium phosphates, xerogels, growth factors, antigens, antibiotics, disinfectants, radiopaque materials, interferons, corticosteroids, hydrogen phosphates, hormones, vitamins, anti-inflammatory drugs, antimicrobial agents or combinations thereof.

[0028] The filler may constitute 0% to 80% by volume of the composite material. The amount of filler in the composite material may be, for example, from 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or 75% by volume to an upper limit of 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or 80% by volume.

[0029] The maximum diameter of the filler particles (or the diameter if they are spherical) can vary, for example, in the range of 10 nm to 50 μm. The diameter can be, for example, from 10 nm, 50 nm, 100 nm, 500 nm, 1 μm, 5 μm, 10 μm, 25 μm or 40 μm to 50 nm, 100 nm, 500 nm, 1 μm, 5 μm, 10 μm, 25 μm, 40 μm or 50 μm.

[0030] The part to be milled is attached to the fastening part. According to an embodiment, the part to be milled is attached to the recess of the fastening part with glue. The recess may be slightly larger than the part to be milled, for example its diameter may be 0.5 mm to 1 mm larger than the diameter of the part to be milled. The glue may be, for example, a one-component glue or a two-component glue, typically an acrylate-based glue. The glue may be a dual-curing glue or a light-curing glue.

[0031] According to another embodiment of the utility model, the part to be milled is attached to the recess of the fastening part by friction. In this embodiment, the attachment end of the part to be milled has substantially the same size as the recess, so that the part to be milled fits tightly in the fastening part by friction. If the material of the part to be milled is slightly elastic, the attachment end can also be slightly larger than the recess, in which case the attachment is even more solid. For example, if the part to be milled is a rod with a circular cross-section of 5 mm diameter, the diameter of the recess of the fastening part can be, for example, 4.8 mm to 4.9 mm.

[0032] The depth of the recess can be, for example, 2mm to 15mm, such as 3mm to 6mm. The depth is typically from 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm or 12mm to 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm. In some cases the recess can extend through the entire fastening portion.

[0033] If desired, threads may be arranged on the side walls of the recess, and in this case corresponding threads may be arranged on the attachment end of the part to be milled, so that the part to be milled can be screwed into position in the recess of the fastening part.

[0034] According to an embodiment of the present invention, the dental product is a root canal post and / or a post piller. Therefore, the present invention can simply manufacture a personalized product that is completely suitable for the patient.

[0035] The milled blank according to the invention can also be used for manufacturing products other than dental products, for example for manufacturing nails and similar products used in the medical field.

[0036] Description of the drawings

[0037] Figure 1 A milling blank according to an embodiment of the invention is schematically shown in a side view. The figure shows a fastening part 1 and a part to be milled 2. The fastening part 1 has a widening 3 into which a recess is arranged, to which the part to be milled is attached.

[0038] Figure 2 A milling blank according to an embodiment of the present invention is schematically shown in an end view. Figure 2 It can be seen that the portion 2 to be milled is arranged substantially in the center of the widened portion 3 to facilitate milling.

Claims

1. A milling blank for a dental product, comprising a fastening portion (1) and a portion to be milled (2), characterized in that: A recess for attachment of the part to be milled (2) is arranged in the fastening part (1), the recess having the size and shape of the fastening end of the part to be milled (2), and the part to be milled (2) is placed and fastened in the recess, so that the part to be milled (2) has a fastening end intended to be placed in the recess of the fastening part (1) and another opposite end.

2. The milling blank for dental products according to claim 1, characterized in that: The part to be milled (2) is a composite material rod.

3. The milling blank for dental products according to claim 2, characterized in that: The cross section of the composite rod is circular, oval or rectangular.

4. The milling blank for dental products according to any one of claims 1 to 3, characterized in that The portion to be milled (2) is attached to the recess of the fastening portion (1) with glue.

5. The milling blank for dental products according to any one of claims 1 to 3, characterized in that The portion to be milled (2) is attached to the recess of the fastening portion (1) by friction.

6. The milling blank for dental products according to any one of claims 1 to 3, characterized in that The dental product is a root canal post or a post.

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