TWI761280B - Estimation method of cutting line in dental mold processing - Google Patents

Abstract

A method for estimating cutting lines in dental mold processing, comprising: randomly defining a plurality of reference points on the periphery of each tooth on a dental mold; performing a calculation method on each reference point to obtain the center of each tooth point; define a machining vector at the center point of the adjacent teeth; define a normal vector perpendicular to the bottom surface of the tooth mold at the center point of each tooth; define a sewing vector at the center point of each tooth, the sewing machine The vector is determined by offsetting the normal vector to the machining vector by a compensation angle; translate the stitching vector to each reference point, and take a cutting plane including the stitching vector and extending toward the gum at each reference point. The planes intersect with the gums at a cutting point; connect the cutting points to obtain a cutting line.

Description

Estimation method of cutting line in dental mold processing

The invention relates to a method for making dental braces, in particular to a method for estimating cutting lines in dental mold processing.

Traditional orthodontic treatment requires sticking metal aligners or ceramic aligners on each tooth one by one, and then using orthodontic wires (steel wires) to tie them to the aligners, and adjust the direction and size of the force to change the direction of the force on the teeth. This achieves the effect of moving the teeth. Since orthodontic correction usually takes two to three years, the appearance looks like wearing a steel brace, which affects the appearance, and also causes a lot of inconvenience in diet and oral cleaning.

The new invisible orthodontic technology can solve the above-mentioned problems. It uses a custom-made removable invisible braces made of transparent material to be worn on the teeth, which has a short adaptation period, reduces pain, and is more beautiful. The above-mentioned invisible braces cover the teeth and also cover the gingiva. The length of the braces will vary according to the different oral environment of each user, so the invisible braces are customized. How to quickly and accurately cut dental molds for making dental braces is the primary problem to be solved by the present invention.

The main purpose of the present invention is to provide a method for estimating the cutting line of dental mold processing, which uses the edge of the broken hole of the gum to directly determine the gingival junction line, and at the same time deeply integrates the back-end processing platform tenon, and can be directly cut on the machine after outputting the path.

In order to achieve the aforementioned purpose, the present invention provides a method for estimating the cutting line of dental mold processing, which includes: A plurality of reference points are randomly defined on the periphery of each tooth on a dental mold; Execute a calculation method on each reference point to obtain the center point of each tooth; connecting the center points of the teeth to generate a machining vector; A normal vector perpendicular to the bottom surface of the dental mold is defined at the center point of each tooth; A stitching vector is defined at the center point of each tooth, and the stitching vector is determined by offsetting the normal vector to the machining vector by a compensation angle; Translate the needle-turning vector to each reference point, and take a cutting plane including the needle-turning vector and extending toward the gum direction on each reference point, and each cutting plane intersects the gum at a cutting point; Connect the cutting points to get the cutting line.

In one embodiment, the calculating means includes defining a coordinate system to obtain the coordinate value of each reference point, and taking the average value of the coordinate value of each reference point to obtain the coordinate value of each tooth center point.

In another embodiment, the calculating means includes taking centripetal lines corresponding to the peripheral edge of the teeth at each reference point, and taking the point formed by the intersection of the most centripetal lines as the center point of each tooth.

Preferably, the method further includes: setting the azimuth angle of each cutting plane with the stitching vector as the axis, so as to adjust the forming position of the cutting point.

Preferably, the compensation angle is 45 degrees.

The above-mentioned objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of the following selected embodiments.

Please refer to Figure 1, which shows the method for estimating the cutting line of dental mold processing provided by the present invention, which includes: A plurality of reference points are randomly defined on the periphery of each tooth on a dental mold; Execute a calculation method on each reference point to obtain the center point of each tooth; Define a machining vector at the center point of adjacent teeth; A normal vector perpendicular to the bottom surface of the dental mold is defined at the center point of each tooth; A stitching vector is defined at the center point of each tooth, and the stitching vector is determined by offsetting the normal vector to the machining vector by a compensation angle; Translate the needle-turning vector to each reference point, and take a cutting plane including the needle-turning vector and extending toward the gum direction on each reference point, and each cutting plane intersects the gum at a cutting point; Connect the cutting points to get the cutting line.

In the above-mentioned method, each implementation step is shown in FIG. 2 to FIG. 6 . First, referring to Figure 2, each tooth 11 on the dental mold 1 has a peripheral edge 12, then a plurality of reference points 2 are randomly selected on the peripheral edge 12 of each tooth 11, and then a center point 3 is calculated based on the reference point 2. . The present invention provides two calculation methods for calculating the center point of each tooth, one of which is to establish a coordinate system first, then define the respective coordinate values according to the position of each reference point 2, and then calculate the coordinates of each reference point 2 Take the average value, that is, add the horizontal coordinate value of each reference point 2 and divide it by the number of reference points, add the vertical coordinate value and divide it by the number of reference points, then you can get the new horizontal coordinate value and the new vertical coordinate value. The coordinate position formed by the coordinate value, which is the position of the center point 3.

Another calculation method for calculating the center point of each tooth provided by the present invention is as shown in Fig. 3, at each reference point 2, take a tangent 31 corresponding to the peripheral edge 12 of the tooth, and then take a direction perpendicular to the tangent 31 centripetal lines 32, these centripetal lines 32 will meet each other. Since the cross-sectional shape of the tooth is not a perfect circle, the centripetal lines 32 from each reference point 2 will not intersect at the same point, only the centripetal lines from the reference point with the same radius of curvature at the location will intersect at the same point. at one point. To sum up, the point formed by the intersection of the most centripetal lines 32 is defined as the center point 3 of each tooth.

After finding the center point of each tooth through the above two methods, connect the center points 3 and 3' of each tooth 11 as shown in Fig. 4 to generate a machining vector 41, which is defined at the center point 3 of each tooth 11. A normal vector 42 that is perpendicular to the bottom surface of the dental mold 1, and then offsets the normal vector 42 to the machining vector 41 by a compensation angle θ, thereby generating a stitching vector 43. The above-mentioned compensation angle θ is set to offset the relative inclination angle between the tool of the cutting machine and the dental mold, and in this embodiment, it is 45 degrees.

After generating the sewing vector 43, then translate the sewing vector 43 to each reference point 2 as shown in Fig. 5, and then take a cutting plane 5 including the sewing vector 43 as shown in Fig. 6. , wherein the cutting plane 5 extends toward the gingiva and intersects with the gingiva at a cutting point. Furthermore, by setting the azimuth angle of each cutting plane 5 with the sewing vector 43 as the axis, the formation position of the cutting point can be adjusted.

When a cutting plane 5 is taken out on each reference point 2 and the cutting point is obtained, the cutting line is obtained by connecting the cutting points, so that the cutting tool can cut the dental mold along the cutting line, then the dental mold can be used for Make custom invisible braces.

However, the disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention, and the replacement of equivalent elements should still belong to the scope of the present invention.

To sum up, those skilled in the art can understand that the present invention can achieve the above-mentioned purpose, and it is in compliance with the provisions of the Patent Law, and an application can be filed in accordance with the law.

1: dental mold 11: tooth １２: Peripheral edge 2: Reference point 3, 3': Center point 41: Processing vector 42: normal vector 43: stitch vector ５: Cutting plane θ: Compensation angle

Figure 1 is a flow chart of the method of the present invention; FIG. 2 to FIG. 6 are schematic diagrams of steps for executing the method of the present invention.

Claims (5)

A method for estimating cutting lines in dental mold processing, comprising: randomly defining a plurality of reference points on the periphery of each tooth on a dental mold; performing a calculation method on each reference point to obtain the center of each tooth point; connect the center points of adjacent teeth to define a machining vector; define a normal vector perpendicular to the bottom surface of the dental mold at the center point of each tooth; define a sewing vector at the center point of each tooth, the needle The turning vector is determined by offsetting the normal vector to the machining vector by a compensation angle; the turning vector is translated to each reference point, and a vector including the turning vector and extending toward the gum is taken at each reference point. Cutting planes, each cutting plane intersects with the gums at a cutting point; connect the cutting points to obtain a cutting line. The method for estimating cutting lines in dental mold processing according to claim 1, wherein the calculation means includes defining a coordinate system to obtain the coordinate values of each reference point, and taking the average value of the coordinate values of each reference point to obtain each Coordinate value of the tooth center point. The method for estimating the cutting line of dental mold processing according to claim 1, wherein the calculation means includes taking a tangent line corresponding to the tooth periphery at each reference point, and then taking a centripetal line perpendicular to the tangent line, and taking The point where the most centripetal lines meet is the center point of each tooth. The method for estimating cutting lines in dental mold processing according to claim 1, further comprising: setting the azimuth angle of each cutting plane with the stitching vector as the axis to adjust the forming position of the cutting point. The method for estimating the cutting line of dental mold processing according to claim 1, wherein the compensation angle is 45 degrees.

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