阅读说明：本技术 由热塑性膜或板制成的牙科辅助物的生产方法 (Method for producing dental aids from thermoplastic films or plates ) 是由 C.施密特 P.福尔诺夫 于 2018-06-04 设计创作，主要内容包括：本发明涉及一种用于生产由热塑性膜或板制成的牙科辅助物的方法。使用上颌和/或下颌的至少一部分的三维数据集以计算机辅助方式生成数字三维工作模型；产生对应于数字工作模型的物理工作模型；在深拉装置内部在物理工作模型上深拉塑料膜或板；通过沿切割线分离出被深拉的塑料膜或板来产生牙科辅助物；在产生物理工作模型之前,数字工作模型自动和/或借助于手动输入工具补充了辅助结构；辅助结构被设计成隆起或凹陷,并沿着工作模型中的数字切割线模型延伸；并且在数字工作模型中自动和/或借助于手动输入工具生成数字切割线模型。(The invention relates to a method for producing a dental aid made of a thermoplastic film or plate. Generating a digital three-dimensional working model in a computer-assisted manner using a three-dimensional data set of at least a part of the upper and/or lower jaw; generating a physical working model corresponding to the digital working model; deep-drawing a plastic film or sheet on a physical working model inside a deep-drawing device; producing a dental aid by separating the deep-drawn plastic film or sheet along a cutting line; the digital working model is supplemented with auxiliary structures automatically and/or by means of manual input tools before the physical working model is generated; the auxiliary structure is designed to be a bump or a dent and extends along the digital cutting line model in the working model; and generating a digital cut line model in the digital work model automatically and/or by means of a manual input tool.)

1. A method for producing a dental aid from a thermoplastic film or plate, wherein

-creating a digital three-dimensional working model in a computer-assisted manner using a three-dimensional data set of at least a part of the upper and/or lower jaw;

-generating a physical working model based on the digital working model;

-deep-drawing a plastic film or sheet on said physical working model inside a deep-drawing device; and

-forming the dental aid from a deep-drawn plastic film or sheet by separation along a cutting line,

it is characterized in that

-the digital working model is supplemented with auxiliary structures automatically and/or via manual input tools prior to generating the physical working model, wherein

-the auxiliary structure is configured as a bump or a recess, and

-extending along a digital cut line model in the working model; and is

-creating the digital cut-line model in the digital work model automatically and/or via a manual input tool.

2. The production method according to claim 1, characterized in that the auxiliary structure is arranged on or adjacent to the cutting line pattern or at a first distance from the cutting line pattern.

3. A production method according to claim 1 or 2, characterized in that the gum line is determined automatically and/or manually in the digital working model and used as a cutting line model.

4. A production method according to claim 1 or 2, characterized in that a gum line is automatically and/or manually determined in the digital working model, an auxiliary line being created at a fixed distance in the gum direction and parallel to the gum line and used as cutting line model.

5. A production method according to claim 1 or 2, characterized in that a gum line is automatically and/or manually determined in the digital working model, an arcuate auxiliary line being created adjacent to or at a distance from the gum line and used as a cutting line model.

6. The production method according to any one of claims 1 to 5, wherein the auxiliary structure has a circular, n-polygonal or conical cross-section.

7. The production method according to any one of claims 1 to 6, characterised in that the dental aid is separated from the deep-drawn plastic film or plate by means of a machining tool, wherein the tool cuts off the auxiliary structure at least to some extent during separation or reaches into the auxiliary structure at least to some extent.

8. A system for producing a dental aid from a thermoplastic film or plate, comprising a deep-drawing device and a computer unit,

it is characterized in that the preparation method is characterized in that,

the system is designed to carry out the production method according to any one of the preceding claims.

9. The system of claim 8, wherein the system comprises a software program, wherein

-the software program is executable on the computer unit,

-the software program comprises at least one digital tool,

-the digital tool is operable via at least one input tool,

-the digital tool is designed to supplement the auxiliary structure in the digital working model.

Technical Field

A method for producing a dental aid from a thermoplastic film or plate, wherein a plastic film or plate is deep-drawn on a physical working model inside a deep-drawing device and a dental aid is formed from the deep-drawn plastic film or plate by separation along a cutting line.

Background

From WO 2014/082624 a2 a method for producing a dental aid in a deep-drawing device is known, in which a working model of the upper and/or lower jaw is placed in the deep-drawing device, and a deep-drawing film is placed on the working model and deep-drawn into a splint. The working model is created in a computer-assisted manner based on the biometric data of the upper and/or lower jaw.

WO 2010/043419 a1 describes a method for producing a multi-layered dental splint.

Thermoplastic materials or deep-drawn films or sheets suitable for dental aids are known, for example, from DE 102011113694 a1 or EP 2417927 a 1.

In the production of dental aids to be formed by means of deep drawing, a particularly time-consuming step is the separation, for example the cutting out of the dental aid, from the plastic film or sheet that is deep drawn. Furthermore, special skills and experience are required to perform this step without error and with satisfactory results.

It is an object of the present invention to further develop the known method and in particular to provide a more reliable and faster production method.

Disclosure of Invention

One subject of the invention is a method for producing a dental aid from a thermoplastic film or plate, wherein a digital three-dimensional working model is created in a computer-aided manner using a three-dimensional data set of at least a part of the upper and/or lower jaw, a physical working model is generated on the basis of the digital working model, deep-drawing a plastic film or sheet on a physical working model inside a deep-drawing device, and forming a dental aid from the deep-drawn plastic film or sheet by separating along a cutting line, prior to generating the physical working model, the digital working model is supplemented with auxiliary structures automatically and/or via manual input tools, wherein the auxiliary structure is configured as a ridge or a valley, extending along the digital cut line model in the working model, and creating a digital cut-line model in the digital work model automatically and/or via a manual input tool.

Here, the term "dental aid" refers to a detachable plastic component or splint which at least partially adapts to the shape of the upper and/or lower jaw, such as molar splints, corrective splints, e.g. holders or aligners, mouthguards, bleaching or snoring splints and splint-based temporary bridges.

Dental aids, such as dental splints, are produced from thermoplastic materials by means of a moulding process known as deep drawing. Deep drawing, also known as thermoforming, thermoforming or vacuum deep drawing, is a process for forming thermoplastic materials. The thermoforming process is generally characterized by the respective semifinished products used, wherein the thinner semifinished product is referred to as film and the thicker semifinished product from about 1.5mm is referred to as sheet. Circular blanks with a thickness of 0.5mm to 5mm are commonly used in dental technology, wherein the material thickness of the resulting product of the deep drawing process is small, at least partly and due to material stretching.

According to the invention, a digital working model, for example a dental model produced using Computer Aided Manufacturing (CAM), a so-called working model, is used as a form template for the shaping process.

The digital working model is created on the basis of a three-dimensional data set which reflects the shape of the upper jaw and/or lower jaw or at least a part of the upper jaw and/or lower jaw and is supplemented according to the invention with an auxiliary structure.

The three-dimensional data set of the upper and/or lower jaw is obtained by: an impression is taken in the mouth of a patient and the impression or a positive model of the impression is then measured, for example, or by intraoral optical measurements directly on the upper and/or lower jaw, for example using an intraoral camera.

The digital work model is created automatically based on the three-dimensional data set and/or via a manual input tool.

The separation of the dental aid from the deep-drawn plastic film or plate is done manually using a tool. The auxiliary structure allows a controlled separation along the auxiliary structure and can be reliably performed in a particularly simple and fast manner even by inexperienced users. Rework is thus avoided, which is often necessary due to processing errors when manually detaching without the auxiliary structure according to the invention.

If the auxiliary structure is configured as a bulge, the separation is performed by guiding the processing tool into the auxiliary structure and then along the auxiliary structure. Thus, the dental aid receives the sharp cutting edge to the outside, and the risk of injury to the gums upon insertion of the resulting dental aid can be reliably avoided.

When using an auxiliary structure configured as a recess, a guide channel for the tool is provided. The width of the recess is advantageously adapted in cross section to the diameter of the tool to be used for separation. The tool particularly preferably has a diameter which decreases towards the outside, and the width of the recess is particularly preferably smaller than the largest diameter of the tool.

The auxiliary structure is preferably arranged on or adjacent to the cutting line pattern or at a first distance from the cutting line pattern. Depending on the width and design of the auxiliary structure, and depending on the type of tool used for separation, the position of the cutting edge actually obtained is offset with respect to the auxiliary structure. It is therefore advantageous to take this into account when positioning the auxiliary structure.

The gum line is advantageously determined automatically and/or manually in a digital working model and used as a cutting line model according to a first alternative embodiment. According to a second alternative embodiment, an auxiliary line is created at a fixed distance in the gum direction and parallel to the gum line and used as a cut line model. According to a third alternative embodiment, a bow-shaped auxiliary line is created adjacent to or at a distance from the gum line and used as a cut line model.

For many applications and/or dental auxiliary structures, it is desirable that the contour of the cutting line is as close as possible to the gum line. With a cutting line which extends completely along the gum line, pressure points in the gum region, for example when wearing a dental aid, are avoided. According to a third alternative embodiment, particularly simple separation and, if applicable, further processing with straight cutting lines is possible.

The auxiliary structure preferably has a circular, n-sided or conical cross-section.

The dental aid is preferably separated from the deep-drawn plastic film or sheet by means of a processing tool, wherein the tool cuts off the auxiliary structure at least to some extent during the separation or reaches into the auxiliary structure at least to some extent.

The invention further relates to a system for producing a dental aid from a thermoplastic film or plate, comprising a deep-drawing device and a computer unit, wherein the system is designed to carry out a production method of the type described above.

The system preferably comprises a software program, wherein the software program is executable on a computer unit, the software program comprises at least one digital tool, the digital tool is operable via at least one input tool, and the digital tool makes it possible to supplement the auxiliary structure in the digital work model.

Drawings

Examples of the design of the present invention are illustrated in the accompanying drawings. The drawings show:

figure 1 is a schematic illustration of the process according to the invention,

figure 2 is a schematic view of a digital work model,

figure 3A, B is a schematic cross-sectional view of a working model according to various embodiments,

fig. 4A-C are schematic diagrams of an auxiliary structure according to various embodiments.

Detailed Description

Fig. 1 shows a schematic representation of a method according to the invention according to a first embodiment, which method comprises method steps S1 to S5.

In a first method step S1, the jaw region to be provided with a dental aid (in this case a dental splint) is digitally recorded. For this purpose, a three-dimensional data set of the lower jaw or upper jaw or at least a part of the lower jaw or upper jaw is generated by means of a measuring device, for example an intraoral camera, and stored on a suitable storage medium of the computer unit.

In a second method step S2, a digital work model is created in a computer-aided manner from the data set generated in the method step S1. The digital working model substantially corresponds to the three-dimensional data set and additionally contains auxiliary structures configured as elevations or depressions, wherein the auxiliary structures are designed and positioned in method step S2 by means of the computer unit.

In a third method step S3, a physical working model is generated based on the digital working model created in the second method step S2, for example by means of a milling and/or grinding device or using a 3D printer.

In a fourth method step S4, the thermoplastic film or sheet is deep-drawn on the physical working model by means of a deep-drawing device.

In a fifth method step, the deep-drawn plastic film or sheet is separated along the auxiliary structure by means of a tool.

If the auxiliary structure is a bulge, at least one peak or ridge of said bulge and the part of the plastic film or sheet that is pulled over it are removed by means of a milling or grinding tool. If the auxiliary structure is a recess, a milling or grinding tool is directed at least partially into the recess to separate the plastic film or sheet along the auxiliary structure.

Fig. 2 shows a schematic view of a three-dimensional data set 1 of the mandible. According to the second embodiment, the boundary line between the tooth 3 and the gum 4 is automatically identified as a sketched form of the cutting line 2, and the auxiliary structure 5 is automatically positioned at a fixed distance a from the sketched form of the cutting line 2. The three-dimensional data set 1 together with the auxiliary structure 5 form a digital working model 6.

As schematically shown in fig. 3A, the auxiliary structure 5 according to the first alternative embodiment is configured as a bulge 7 on the working model 6. After the deep-drawing process, the bulges 7 and the plastic film or plate 8 drawn over them are at least partially removed by means of a tool 9, for example by grinding or milling.

As schematically shown in fig. 3B, the auxiliary structure 5 according to the second alternative embodiment is configured as a recess 10 protruding into the working model 6. After the deep-drawing process, the plastic film or sheet 8 is separated along the depression 10 using the tool 9, while the tool 9 is guided at least partially into the depression 10.

Different embodiments of the cross-section of the auxiliary structure, i.e. tapered, rounded or n-sided, are outlined in fig. 4A-C.

List of symbols of elements

1 three-dimensional data set

2 cutting line

3 teeth

4 gingival

5 auxiliary structure

6 digital work model

7 bump

8 deep-drawn plastic film or sheet

9 tool

10 depressions