FI13503Y1 - Milling preform for dental product - Google Patents

Abstract

A milling blank for a dental product comprising a fastening part (1) and a milling part (2), characterized in that a recess is arranged in the fastening part for fastening the milling part.

Description

MILLING BLANKET FOR DENTAL PRODUCT

FIELD OF THE INVENTION

The object of the invention is a milling blank for a dental product. The milling blank comprises a fastening part and a part to be milled.

BACKGROUND AND OBJECTIVES OF THE INVENTION

Milling blanks are used in various fields of technology, and in dentistry, e.g. — for the manufacture of root canal posts and crowns. In particular, milling blanks are used in —computer-aided design (CAD, Computer Aided Design) and computer-aided manufacturing (CAM, Computer Aided

Manufacturing).

Milling blanks typically comprise a metal fastening part that can be attached = to the milling device. A part to be milled is arranged in the fastening part, which can be, for example, plastic, plastic and fiber composite or ceramic material.

Typically, the part to be milled is in the shape of a cube or a rectangular corner, and the surface of it that faces the mounting part is substantially the same size as the surface of the mounting part that is to be milled.

N 20 parts. This ensures a reliable attachment of the clamping part and the milled part

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N between the parts, so that the part to be milled will definitely stay in place during milling

During O i. When the milling is finished, the product is removed from the fastening part 2, for example by cutting. The fastening part can then either

E is reused or its material can be recycled. 5 25 — Fasteners are typically standardized so that they are suitable for different applications

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S for milling equipment without problems. Their dimensions are therefore usually the same > for all manufacturers.

Milling blanks according to known technology are well suited for products whose volume is close to the volume of the part to be milled. If you want to make products with a volume significantly smaller than the volume of the part to be milled, the part to be milled is wasted considerably, and in addition, milling takes a significant amount of time. On the other hand, milling is easier and the end product is reliably exactly as desired, when the surfaces of the parts to be milled and the fastening part facing each other are as large as possible.

The goal of the invention is to have a milling blank that is suitable — especially for milling small or thin pieces, but in such a way that milling is easy and the final product is reliably as desired.

BRIEF DESCRIPTION OF PICTURES

Figure 1 schematically shows a milling blank according to one embodiment of the invention, viewed from the side.

Figure 2 schematically shows a milling blank according to an embodiment of the invention as viewed from the end.

DESCRIPTION OF THE INVENTION

The subject of the invention is a milling blank for a dental product, which comprises a fastening part and a milling part. Milling blank

A 20 — a recess is arranged in the fastening part for fastening the part to be milled

O for. 2 - The milling blank according to the invention has a recess in the mounting part essentially 7 the size and shape of the mounting end of the milling part, in which the milling part can be arranged and attached. The part to be milled therefore has a = 25 — mounting end, which is intended to be arranged = the mounting part

N to the recess, as well as the end opposite it. Typically, the part 5 to be milled is elongated, i.e. its length is significantly greater than its largest diameter. The cross-section of the part to be milled can be, for example, in the shape of a circle, ellipse, square or rectangle. The cross-section can be, for example, circular, i.e. the part to be milled is in the shape of a straight cylinder with a circular base. The cross-section can also be elliptical or rectangular, in which case the recess has essentially the same shape. Such non-circular shapes can be advantageous, because then the part to be milled cannot twist in the recess.

With the milling blank according to the invention, it is therefore possible to produce, for example = root canal posts without significantly wasting material and faster than traditional methods. When the part to be milled is attached to the recess of the fastening part, it remains reliably in place during milling. This also enables the use of standardized mounting parts without problems.

According to one embodiment, the part to be milled is a composite rod, which comprises longitudinally arranged fibers of the rod and polymer.

The length of the composite rod can be, for example, 10-25 mm, typically 15 mm, and its diameter can be, for example, 2-10 mm, typically 4-6 mm. In the case of non-circular cross-sections — diameter means the largest dimension of the cross-section.

A composite rod can comprise, for example, 2-65% fibers by volume. 20 — The number of fibers in the composite can be, for example, from 2, 3, 4, 5, 10,

N 15, 20, 25, 30, 35, 40, 45, 50, 55 or 60 % by volume to the upper limit 3, 4, 5, 10, 5 15, 20, 25, 30, 35, 40, 45, 50, 55 , 60 or 65% by volume of the composite up to n. One preferred amount of fibers is 2-35% by volume.

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E Fibers can be selected from a group that includes inert glass fibers, = 25 — bioactive glass fibers, silica fibers produced by the sol-gel method, 3 other fibers based on silicon oxide, aluminum oxide fibers,

S zirconia fibers, apatite fibers and quartz fibers. Mixtures of different fibers can also be used. Preferably, the fibers are therefore inorganic fibers.

The fibers can be surface treated so that they adhere better to the surrounding polymer matrix. = Such surface treatments are known in the field as such.

The diameter of the fibers can vary between 0.1 um and 100 um. The diameter can be, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 or 95 um up to 0.2, 0.3, 0.4, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 10, 15, 20, 25, 30, 35 , up to 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 or 100 µm. Favorable diameters are, for example, 1-30 um and 10-25 um.

More than one fiber diameter can also be used in the composite.

According to an advantageous embodiment, the fibers are long, continuous fibers in the composite, and they are substantially parallel to the longest dimension of the part to be milled, i.e. they are longitudinal to the rod. The fibers can — however, also be arranged in a spiral bundle in the composite, or the milled part can have broken fibers, i.e. short fibers, so that the inner layer is a continuous fiber and the outer layer is a broken fiber, or so that the continuous and broken fibers form — a layer structure in the lengthwise direction of the bar.

The polymer forms the matrix in the composite, and the amount of the matrix

N in the composite can be, for example, 20-98% by volume of the composite. 5 The amount of matrix in the composite can be, for example, from 20, 25, 30, 35, n 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 or 95 volume -% to the upper limit 2 25, 30, 35 , 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 or 98 volume a up to 25% of the composite. 3 The matrix may be a polymer whose monomer is selected from the group consisting of

S methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, > isobutyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, tetrahydrofurfuryl methacrylate

late, benzyl methacrylate, morpholinoethyl methacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate (TEGDMA), diurethane dimethacrylate, 2,2-bis(4-(2-hydroxy-3-methacryloxy)-phenyl)propane (BisGMA), methacrylate-functionalized 5 dendrimers, other meacrylated hyperbranched oligomers and their mixtures. The matrix can also be made of epoxy, or of cross-linking monomers or polymers, such as ε-caprolactone, polycaprolactone, polylactides, polyhydroxyproline, and other biopolymers, as well as polyamides, polyurethane, polyethylene, —polypropylene, other polyolefins.

The composite can also comprise fillers, typically in particulate form. Particles here mean shapes in which no dimension is significantly larger than another dimension. Filler particles can be bioactive or inert, and both can be used. The filler can be, for example, bioactive glass, silicon (Si), calcium (Ca), phosphorus (P), barium (Ba), magnesium (Mg), potassium (K), sodium (Na) or titanium (Ti) oxides or fluorine ( F) or other compounds of these elements, color pigments, inert ceramics, hydroxyapatite or other calcium phosphates, xerogels, — growth factors, antigens, antibiotics, disinfectants, radiopaque substances, interferons, corticosteroids, biphosphates,

N hormones, vitamins, anti-inflammatory substances, antimicrobial substances, or mixtures of these. = Filler can be 0-80% by volume of the composite. Amount of filler

E 25 —composite can have, 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, 3 up to 35, 40, 45, 50, 55, 60, 65, 70, 75 or 80% by volume of the composite.

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8 5 The largest diameter of the filler particles (or diameter if they are round) can vary, for example, between 10 nm and 50 um. The diameter can be, for example, from 10 nm, 50 nm, 100 nm, 500 nm, 1 um, 5 um, 10 um, 25 um or 40 um to an upper limit of 50 nm, 100 nm, 500 nm, 1 um, 5 um, 10 um, Up to 25 um, 40 um or 50 um.

The part to be milled is attached to the fixing part. According to one embodiment, the part to be milled is attached to the recess of the fastening part with glue.

The recess can then be slightly larger than the part to be milled, for example its diameter can be 0.5-1 mm larger than the diameter of the part to be milled. The glue can be, for example, a one- or two-component glue, typically — acrylate-based. The glue can be double-cured or light-cured.

According to another embodiment of the invention, the part to be milled is fixed in the recess of the fastening part by friction. In this embodiment, the attachment end of the milled part is therefore essentially the same size as the recess, whereby the milled part sits firmly in the attachment part, with the help of friction. If the material of the part to be milled is slightly flexible, the attachment end can also be slightly larger than the recess, in which case the attachment is even more stable. — For example, if the part to be milled is a wheel bar in cross-section with a diameter of 5 mm, the diameter of the recess of the fastening part can be, for example, 4.8-4.9 mm.

The depth of the recess can be, for example, 2-15 mm, such as, for example, 3-6 mm. The depth can typically be from 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or

N 12 mm to a depth of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 mm. 5 In some cases, the recess can also extend through the entire fastening part. = If desired, threads can be arranged on the walls of the recess, and

E corresponding — the threads can then be arranged on the mounting end of the part to be milled = 25 — in which case the part to be milled can be screwed into place

S into the recess of the fastening part. 8 5

According to one embodiment of the invention, the dental product is a root canal post and/or post. The invention therefore makes it possible to easily manufacture individual products to suit the patient.

The milling blank according to the invention can also be used for the manufacture of non-dental products, such as for example nails used in medicine and similar products.

DESCRIPTION OF PICTURES

Figure 1 schematically shows a milling blank according to one embodiment of the invention, viewed from the side. The figure shows the fastening part 1 and the milling part 2. The fastening part 1 has a widening 3 in which a recess is arranged, in which the milling part is attached.

Figure 2 schematically shows a milling blank according to one embodiment of the invention, viewed from the end. Figure 2 therefore shows that the part to be milled 2 is arranged essentially in the middle of the widening 3 of the fastening part, so that milling is easy.

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Claims (6)

PROTECTION REQUIREMENTS 1. A milling blank for a dental product comprising a fastening part (1) and a milling part (2), characterized in that — a recess is arranged in the fastening part for fastening the milling part. 2. Milling blank according to claim 1, characterized in that the part to be milled (2) is a composite rod, which comprises longitudinally arranged fibers of the rod and polymer. 3. A milling blank according to claim 2, characterized in that the cross-section of the composite rod is round, oval or rectangular. 4. Milling blank according to one of the preceding protection requirements, characterized in that the part to be milled (2) is attached to the recess of the fastening part (1) with glue. — 5. Milling blank according to one of the protection claims 1-3, characterized in that the part to be milled (2) is fixed in the recess of the fastening part (1) by friction. 6. A milling blank according to one of the preceding protection requirements, N characterized by the fact that the dental product is a root canal post N S 20 or a pin post. = I = 5 N N O N 5