System, medium and method for digitally designing Twin block

Abstract

The invention discloses a system for digitally designing Twin block. The system comprises a tooth model import program module, an undercut program module, a steel wire model generation program module, a occlusal pad model generation program module, a guide inclined plane generation program module, an anatomical surface generation program module, a bounding box model generation program module, a card slot generation program module and an output program module, a method for digitally designing a Twin block realizes digitally designing an upper and lower jaw model with an occlusal pad bounding box, directly performing 3D printing on the model, directly laying a resin base after mounting a steel wire, and disassembling the occlusal pad bounding box after the resin base is solidified, so that the Twin block is manufactured, and the method is simple and efficient and does not need a tedious process of an upper jaw frame.

Description

Technical Field

[0001] The present invention relates to the field of dentistry, and in particular to a system, medium and method for digitally designing a Twin block. Background Art

[0002] Twin block appliances, also known as double jaw pad appliances, were invented by Professor Clark in 1982. They are often used for children who are at the peak of their growth and development to promote the growth and development of the mandible and improve the sagittal misalignment of the upper and lower jaws. The correction mechanism is to use the guide bevels of the upper and lower jaw appliances to guide the mandible to a protruding position, and use the natural force of muscle contraction to be transmitted to the dentition and jaw through the appliance, causing the mandibular condyle to produce adaptive reconstruction and promote the growth and development of the mandible.

[0003] The Twin block appliance includes a maxillary appliance installed in the maxillary dentition and a mandibular appliance installed in the mandibular dentition. Both the maxillary and mandibular appliances include a resin base, a retention wire, an anatomical occlusal pad and a guide bevel. The maxillary guide bevel faces forward and downward at 45 degrees, and the mandibular guide bevel faces backward and upward at 45 degrees. When the maxillary guide bevel fits tightly with the mandibular guide bevel, the mandibular dentition is guided forward to a protrusive position.

[0004] In the past 40 years, the traditional production method has been used: the first step is to manually bend the retention wires required for the upper and lower jaw tooth models and fix them on the upper and lower jaw tooth models; the second step is to install the leading mandibular tooth model and the maxillary tooth model on the jaw frame according to the bite wax; the third step is to first use a resin base to make a pad in the posterior molar area of ​​the maxillary tooth model, and before the resin base solidifies, it collides with the mandibular tooth model to copy the cusp imprint of the mandibular tooth model to the surface of the resin base to form an anatomical pad for the maxilla; the fourth step is to wait for the resin base to completely solidify and harden, and then grind to make the maxillary guide bevel; the fifth step is to use a resin base to make a pad in the premolar area of ​​the mandibular tooth model, and before the resin base solidifies, it collides with the maxillary guide bevel to form a matching mandibular guide bevel; the sixth step is to collide it with the maxillary tooth model, so as to copy the cusp imprint of the maxillary tooth model to the surface of the resin base to form an anatomical pad for the mandible; the seventh step is grinding and polishing.

[0005] The traditional production process is very complicated, time-consuming and labor-intensive. With the development of digital technology, many patients use intraoral 3D scanning to digitize tooth models. The factory that makes Twin blocks has to 3D print the 3D models and then use traditional methods to make Twin block appliances. Therefore, there is an urgent need for a system and method for digitally designing Twin blocks, which can realize digital design of upper and lower jaw models with occlusal enclosures, directly 3D print the models, and directly lay the resin base after installing the steel wire. After waiting for the resin base to solidify, the occlusal enclosure box can be removed to complete the production of the Twin block. It is simple and efficient, and does not require the cumbersome process of the maxillary frame. Summary of the invention

[0006] The purpose of the present invention is to design a system, medium and method for digitally designing a Twin block, so as to realize the digital design of upper and lower jaw models with occlusal pad enclosing boxes, directly 3D print the models, directly lay the resin base after installing the steel wire, wait for the resin base to solidify, remove the occlusal pad enclosing box to complete the production of the Twin block, which is simple and efficient, and does not require the cumbersome process of the maxillary frame.

[0007] A system for digitally designing Twin blocks comprises: a tooth model importing program module, an undercut program module, a wire model generating program module, a closure model generating program module, a guide bevel generating program module, an anatomical surface generating program module, a bounding box model generating program module, a slot generating program module and an output program module.

[0008] Furthermore, the tooth model importing program module is specifically used to import upper and lower jaw tooth models, adjust the anterior-posterior and vertical spatial positions of the mandibular tooth model and the maxillary tooth model, and the wire model generating program module is specifically used to generate a retention wire model.

[0009] Furthermore, the undercut program module is specifically used to detect and fill the undercut areas on the upper and lower tooth models. The viewing angle and undercut detection parameters can be selected, and the vertical ray method or other methods are used to detect and display the undercut areas, and then fill the undercut areas to prevent the completed resin base from being unable to be removed from the upper and lower tooth models.

[0010] Furthermore, the occlusal pad model generation program module is specifically used to generate an occlusal pad model in a selected area between the upper and lower mandibular tooth models, and the guide bevel generation program module is specifically used to generate and adjust the occlusal pad guide bevels on the upper and lower mandibular tooth models. The occlusal pad model includes: a maxillary occlusal pad, a maxillary occlusal pad guide bevel, a maxillary occlusal pad anatomical surface, a maxillary occlusal pad posterior bevel, a maxillary occlusal pad connecting surface, a maxillary steel wire, a mandibular occlusal pad, a mandibular occlusal pad guide bevel, a mandibular occlusal pad anatomical surface, a mandibular occlusal pad anterior bevel, a mandibular occlusal pad connecting surface and a mandibular steel wire.

[0011] Furthermore, the occlusal pad model generation program module can automatically generate a dental arch line, generate a rectangular occlusal pad model along the occlusal surface of the front and rear teeth according to the generated dental arch line, and then adjust the thickness and width of the six surfaces of the occlusal pad model to an appropriate size, and use the guide bevel adjustment window to select the positions of the maxillary and mandibular occlusal pad guide bevels. The maxillary guide bevel is usually located between the first bicuspid and the second bicuspid, and the mandibular guide bevel is usually located between the second bicuspid and the first molar. It can also be other positions, such as the maxillary guide bevel is located between the upper canine and the first premolar, and the mandibular guide bevel is located between the first premolar and the second premolar. In general, the maxillary guide bevel faces downward and forward at an angle of 40 to 60 degrees, and the mandibular guide bevel faces upward and backward at an angle of 40 to 60 degrees, and the upper and lower mandibular guide bevels on the left and right sides are completely fitted.

[0012] Furthermore, the anatomical surface generation program module is specifically used to generate a maxillary occlusal pad anatomical surface that matches the tooth cusps on the mandibular tooth model and a mandibular occlusal pad anatomical surface that matches the tooth cusps of the maxillary tooth model.

[0013] Furthermore, a matching anatomical surface of the occlusal pad is obtained by performing Boolean operation on the tooth cusps of the maxillary occlusal pad and the mandibular tooth model, and a matching anatomical surface of the occlusal pad is obtained by performing Boolean operation on the tooth cusps of the mandibular occlusal pad model and the maxillary tooth model. The anatomical surface helps to provide occlusal stability. After wearing the Twin block appliance, it is not easy to shake left and right, and can provide patients with efficient correction force.

[0014] Furthermore, the bounding box model generation program module is specifically used to generate bounding box models that match the upper and lower jaw pad models respectively, and the bounding box model includes: a bounding box guide bevel panel, a bounding box outer panel, a bounding box anatomical panel, a bounding box rear bevel panel, a wire slot, a retention pin and a retention pin recess.

[0015] In one embodiment, there are two methods for generating a bounding box as follows: The first method: first generate a closure model, and when the closure anatomical surface is not generated, expand the closure model to the occlusal surface, lateral surface, mesial surface and distal surface by 2 to 5 mm respectively to obtain an outward-expanded closure model, perform Boolean calculation on the outward-expanded closure model and the closure model with the generated closure anatomical surface to obtain the bounding box model body, and connect the retention pin to the bounding box model body to obtain the final bounding box model.

[0016] The second method is to first generate the cushion model and the cushion anatomical surface, obtain the outer surface of the cushion model, and expand 2 to 5 mm towards the cushion guide bevel, occlusal surface, lateral surface and distal surface respectively to obtain the bounding box guide bevel panel, anatomical panel, lateral panel and distal panel. Then, the four panels are merged to obtain the bounding box model body. After connecting the retention pin to the bounding box model body, the final bounding box model is obtained.

[0017] Furthermore, after the bounding box is 3D printed separately, it can be assembled with the maxillary tooth model. The retention pin prevents the bounding box from loosening and falling off. The retention pin can also be replaced with other similar concave-convex embedded structures.

[0018] Furthermore, the slot generation program module is specifically used to generate a slot that matches the retention wire model, and the output program module is specifically used to output the designed three-dimensional model. After 3D printing the maxillary tooth model with the slot, the automatically bent steel wire is embedded in the retention wire slot, and then the surrounding box is installed. The resin base can be directly laid. After the resin base solidifies, the surrounding box is directly removed to obtain the completed Twin block appliance, which only needs to be polished to complete the production.

[0019] A method for digitally designing a Twin block comprises the following steps: Step 1: Import the upper and lower jaw tooth models and adjust the spatial positions of the upper and lower jaw tooth models; Step 2: Select the viewing angle and undercut area detection parameters, and fill the undercut area; Step 3: Generate a retention wire model; Step 4: Generate a occlusal pad model in the selected area between the upper and lower jaw tooth models, and generate and adjust the occlusal pad guide bevel on the upper and lower jaw tooth models; Step 5: Generate the anatomical surface of the occlusal model that matches the tooth cusps on the upper and lower jaw tooth models; Step 6: Generate a slot matching the retention wire model; Step 7: Generate a bounding box model that matches the upper and lower jaw occlusal pad models; Step 8: Output the three-dimensional model of the upper and lower teeth with the retention wire slots and the retention pin holes, and output the three-dimensional model of the bounding box.

[0020] Furthermore, step three may be performed before any step between step four and step six.

[0021] The invention discloses a system for digitally designing a Twin block, comprising: a tooth model importing program module, an undercut program module, a steel wire model generating program module, a occlusal pad model generating program module, a guide bevel generating program module, an anatomical surface generating program module, a bounding box model generating program module, a card slot generating program module and an output program module, a method for digitally designing a Twin block, realizing digitally designing an upper and lower jaw model with an occlusal pad bounding box, directly 3D printing the model, directly laying a resin base after installing the steel wire, and removing the occlusal pad bounding box after waiting for the resin base to solidify to complete the production of the Twin block, which is simple and efficient, and does not require a tedious maxillary frame process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a gasket model in a digitally designed Twin block system; Figure 2 A schematic diagram of a digitally designed Twin block system with a gasket guide slope adjustment window; Figure 3 It is a left view of the bounding box model of the maxillary tooth model in a digitally designed Twin block system; Figure 4 It is a right view of the bounding box model of the maxillary tooth model in a digitally designed Twin block system; Figure 5 A flowchart of a method for digitally designing a Twin block.

[0024] On the figure: 10-maxillary occlusal pad, 11-maxillary occlusal pad guide bevel, 12-maxillary occlusal pad anatomical surface, 13-maxillary occlusal pad posterior bevel, 14-maxillary occlusal pad connecting surface, 15-maxillary wire, 20-mandibular occlusal pad, 21-mandibular occlusal pad guide bevel, 22-mandibular occlusal pad anatomical surface, 23-mandibular occlusal pad anterior bevel, 24-mandibular occlusal pad connecting surface, 25-mandibular wire, 30-bounding box model, 31-bounding box guide bevel panel, 32-bounding box outer panel, 33-bounding box anatomical panel, 34-bounding box posterior bevel panel, 35-wire slot, 36-retention pin, 37-retention pin recess, 40-guide bevel adjustment window. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0026] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] Exemplarily, a system for digitally designing Twin blocks includes: a tooth model importing program module, an undercut program module, a wire model generating program module, a pad model generating program module, a guide bevel generating program module, an anatomical surface generating program module, a bounding box model generating program module, a slot generating program module and an output program module.

[0029] Furthermore, a tooth model importing program module in a digitally designed Twin block system is specifically used to import upper and lower jaw tooth models, adjust the anterior-posterior and vertical spatial positions of the mandibular tooth model and the maxillary tooth model, and the wire model generating program module is specifically used to generate a retention wire model.

[0030] Furthermore, an undercut program module in a digitally designed Twin block system is specifically used to detect and fill undercut areas on upper and lower tooth models. The viewing angle and undercut detection parameters can be selected, and the vertical ray method or other methods are used to detect and display the undercut areas, and then the undercut areas are filled to prevent the manufactured resin base from being unable to be removed from the upper and lower tooth models.

[0031] like Figure 1 As shown, a occlusal pad model generation program module in a digital design Twin block system is specifically used to generate an occlusal pad model in a selected area between the upper and lower jaw tooth models, and the guide bevel generation program module is specifically used to generate and adjust the occlusal pad guide bevels on the upper and lower jaw tooth models. The occlusal pad model includes: a maxillary occlusal pad 10, a maxillary occlusal pad guide bevel 11, a maxillary occlusal pad anatomical surface 12, a maxillary occlusal pad posterior bevel 13, a maxillary occlusal pad connecting surface 14, a maxillary steel wire 15, a mandibular occlusal pad 20, a mandibular occlusal pad guide bevel 21, a mandibular occlusal pad anatomical surface 22, a mandibular occlusal pad anterior bevel 23, a mandibular occlusal pad connecting surface 24 and a mandibular steel wire 25.

[0032] like Figure 1 and Figure 2 As shown, a dental arch line can be automatically generated by a pad model generation program module in a system for digitally designing Twin blocks. A rectangular pad model is generated along the occlusal surface of the front and rear teeth according to the generated dental arch line, and then the thickness and width of the six surfaces of the pad model are adjusted to a suitable size. The positions of the maxillary and mandibular pad guide slopes are selected using the guide slope adjustment window 40. The maxillary guide slope is usually located between the first bicuspid and the second bicuspid, and the mandibular guide slope is usually located between the second bicuspid and the first molar. Other positions are also possible, such as the maxillary guide slope is located between the upper canine and the first premolar, and the mandibular guide slope is located between the first premolar and the second premolar. In general, the maxillary guide slope faces downward and forward at an angle of 40 to 60 degrees, and the mandibular guide slope faces upward and backward at an angle of 40 to 60 degrees. The upper and lower mandibular guide slopes on the left and right sides fit completely.

[0033] Furthermore, an anatomical surface generation program module in a digital design Twin block system is specifically used to generate a maxillary occlusal pad anatomical surface that matches the tooth cusps on the mandibular tooth model and a mandibular occlusal pad anatomical surface that matches the tooth cusps of the maxillary tooth model.

[0034] Furthermore, a matching anatomical surface of the occlusal pad is obtained by performing Boolean operation on the tooth cusps of the maxillary occlusal pad and the mandibular tooth model, and a matching anatomical surface of the occlusal pad is obtained by performing Boolean operation on the tooth cusps of the mandibular occlusal pad model and the maxillary tooth model. The anatomical surface helps to provide occlusal stability. After wearing the Twin block appliance, it is not easy to shake left and right, and can provide patients with efficient correction force.

[0035] like Figure 3 and Figure 4 As shown, a bounding box model generation program module in a system for digitally designing Twin blocks is specifically used to generate bounding box models that match the upper and lower jaw pad models respectively. The bounding box model 30 includes: a bounding box guide bevel panel 31, a bounding box outer panel 32, a bounding box anatomical panel 33, a bounding box rear bevel panel 34, a wire slot 35, a retaining pin 36 and a retaining pin recess 37.

[0036] Exemplarily, a method for generating a bounding box is as follows: first, a occlusal pad model is generated; when the occlusal pad anatomical surface is not generated, the occlusal pad model is expanded by 2 to 5 mm toward the occlusal surface, the lateral surface, the mesial surface and the distal surface respectively to obtain an outward-expanded occlusal pad model; the outward-expanded occlusal pad model is subjected to Boolean calculation with the occlusal pad model for which the occlusal pad anatomical surface has been generated to obtain a bounding box model body; after the retention pin is connected to the bounding box model body, a final bounding box model is obtained; the Boolean calculation involving the maxillary occlusal pad anatomical surface 12 includes: After the lingual side and bottom of the pad model are offset and the opposing jaw Boolean subtraction is performed, the intermediate files are generated, namely the pad model-opposite jaw Boolean, the bounding box model and the pad model-opposite jaw Boolean subtraction. The bounding box model is generated by expanding the four surfaces of the pad model, namely the maxillary pad guide bevel 11, the maxillary pad anatomical surface 12, the maxillary pad posterior bevel 13 and the maxillary pad connecting surface 14 or the mandibular pad guide bevel 21, the mandibular pad anatomical surface 22, the mandibular pad anterior bevel 23 and the mandibular pad connecting surface 24.

[0037] Furthermore, after the bounding box is 3D printed separately, it can be assembled with the maxillary tooth model. The retention pin prevents the bounding box from loosening and falling off. The retention pin can also be replaced with other similar concave-convex embedded structures.

[0038] Furthermore, a slot generation program module in a digitally designed Twin block system is specifically used to generate a slot that matches a retention wire model, and an output program module is specifically used to output the designed three-dimensional model. After 3D printing the maxillary tooth model with the slot, the automatically bent steel wire is embedded in the retention wire slot, and then the surrounding box is installed, and the resin base can be directly laid. After the resin base solidifies, the surrounding box is directly removed to obtain the completed Twin block appliance, which only needs to be polished to complete the production.

[0039] like Figure 5 As shown, a method for digitally designing a Twin block includes the following steps: Step 1: The tooth model importing program module imports the upper and lower jaw tooth models and adjusts the spatial positions of the upper and lower jaw tooth models; Step 2: The undercut program module selects the viewing angle and undercut area detection parameters, and fills the undercut area; Step 3: The wire model generation program module generates a retention wire model; Step 4: the occlusal pad model generation program module generates the occlusal pad model in the selected area between the upper and lower jaw tooth models, and the guide bevel generation program module generates and adjusts the occlusal pad guide bevel on the upper and lower jaw tooth models; Step 5: The anatomical surface generation program module generates an anatomical surface of the occlusal pad model that matches the tooth cusps on the upper and lower jaw tooth models; Step 6: The card slot generation program module generates a card slot matching the retention wire model; Step 7: The bounding box model generation program module generates a bounding box model that matches the upper and lower jaw occlusal pad models; Step 8: The output program module outputs the three-dimensional model of the upper and lower teeth with the retention wire slots and the retention pin recesses, and outputs the three-dimensional model of the bounding box.

[0040] Furthermore, step three may be performed before any step between step four and step six.

[0041] The invention discloses a system for digitally designing a Twin block, comprising: a tooth model importing program module, an undercut program module, a steel wire model generating program module, a occlusal pad model generating program module, a guide bevel generating program module, an anatomical surface generating program module, a bounding box model generating program module, a card slot generating program module and an output program module, a method for digitally designing a Twin block, realizing digitally designing an upper and lower jaw model with an occlusal pad bounding box, directly 3D printing the model, directly laying a resin base after installing the steel wire, and removing the occlusal pad bounding box after waiting for the resin base to solidify to complete the production of the Twin block, which is simple and efficient, and does not require a tedious maxillary frame process.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A system for digitally designing Twin blocks, characterized in that: include: Tooth model importing program module, undercut program module, wire model generating program module, pad model generating program module, guide bevel generating program module, anatomical surface generating program module, bounding box model generating program module, slot generating program module, and output program module.

2. The system for digitally designing a Twin block according to claim 1, characterized in that: The tooth model importing program module is specifically used to import the upper and lower jaw tooth models, and adjust the anterior-posterior and vertical spatial positions of the lower and upper jaw tooth models and the upper jaw tooth models. The undercut program module is specifically used to detect and fill the undercut areas on the upper and lower jaw tooth models. The wire model generating program module is specifically used to generate a retention wire model.

3. The system for digitally designing a Twin block according to claim 1, characterized in that: The occlusal pad model generation program module is specifically used to generate an occlusal pad model in a selected area between the upper and lower jaw tooth models, and the guide bevel generation program module is specifically used to generate and adjust the occlusal pad guide bevel on the upper and lower jaw tooth models.

4. The system for digitally designing a Twin block according to claim 1, characterized in that: The anatomical surface generation program module is specifically used to generate a maxillary occlusal pad anatomical surface that matches the tooth cusps on the mandibular tooth model and to generate a mandibular occlusal pad anatomical surface that matches the tooth cusps on the maxillary tooth model.

5. The system for digitally designing a Twin block according to claim 1, characterized in that: The bounding box model generation program module is specifically used to generate bounding box models that match the upper and lower jaw pad models respectively. The bounding box model includes: a bounding box guide bevel panel, a bounding box outer panel, a bounding box anatomical panel, a bounding box rear bevel panel, a wire slot, a retention pin and a retention pin recess.

6. The system for digitally designing a Twin block according to claim 1, characterized in that: The slot generation program module is specifically used to generate a slot that matches the retention wire model, and the output program module is specifically used to output the designed three-dimensional model.

7. A method for digitally designing a Twin block, characterized in that: The following steps are involved: Step 1: Import the upper and lower jaw tooth models and adjust the spatial positions of the upper and lower jaw tooth models; Step 2: Select the viewing angle and undercut area detection parameters, and fill the undercut area; Step 3: Generate a retention wire model; Step 4: Generate a occlusal pad model in the selected area between the upper and lower jaw tooth models, and generate and adjust the occlusal pad guide bevel on the upper and lower jaw tooth models; Step 5: Generate the anatomical surface of the occlusal model that matches the tooth cusps on the upper and lower jaw tooth models; Step 6: Generate a slot matching the retention wire model; Step 7: Generate a bounding box model that matches the upper and lower jaw occlusal pad models; Step 8: Output the three-dimensional model of the upper and lower teeth with the retention wire slots and the retention pin holes, and output the three-dimensional model of the bounding box.

8. The method for digitally designing a Twin block according to claim 7, characterized in that: The step three may be performed before any one of the steps between step four and step six.

9. An electronic device, characterized in that: include: at least one processor; And, a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for digitally designing a Twin block as described in any one of claims 7 and 8.

10. A computer-readable storage medium storing instructions, which, when executed on a computer, enable the computer to execute the method for digitally designing a Twin block as claimed in claim 7 or 8.

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