Simple intraoral Gothic bow for recording median relation of digital complete denture and recording method of simple intraoral Gothic bow

Abstract

According to the simple intraoral Gothic bow for recording the central relation of the digital complete denture and the recording method of the simple intraoral Gothic bow, a digital design and manufacturing mode is adopted, the simple intraoral Gothic bow and a try-on denture are integrally completed through 3D printing, try-on of the digital complete denture can be carried out, the protruding degree and the aesthetic effect of anterior teeth can be observed, and the working efficiency of the digital complete denture can be improved. Meanwhile, intraoral Gothic arch tracing of a mandibular movement track can be carried out, and the device is disposable, does not need to be assembled and disassembled and does not need to be recycled, so that possible cross infection is avoided; meanwhile, the use is convenient, the clinical working time and the repair treatment time of the complete denture are saved, and the treatment course is shortened.

Description

Technical Field

[0001] This invention relates to a method for recording the centric relationship of digital complete dentures, specifically to a simplified intraoral Gothic arch and its recording method for recording the centric relationship of digital complete dentures. Background Technology

[0002] Edentulous patients typically use complete dentures to restore their oral and maxillofacial functions, helping them chew, speak, and maintain normal lower third facial height. With the continuous improvement of oral scanning technology and precision, and the increasing maturity of dental 3D printing technology, the traditional complete denture fabrication process is gradually being replaced by a digital fabrication process.

[0003] By using impressions or direct intraoral scanning and determining jaw position, digital design and manufacturing technologies are employed to complete the fabrication of complete dentures. This eliminates the need for traditional processes such as articulation, tooth arrangement, and glue application, avoiding previous material consumption and environmental pollution, reducing the number of follow-up visits for patients, and improving the accuracy of denture fabrication.

[0004] In the recording of centric relationships in digital complete dentures, the current method of guiding the mandible to retract is mostly used. It is simple to operate, but it mainly relies on the doctor's experience and has poor clinical repeatability.

[0005] While recording methods using traditional and modified Gothic arches offer high accuracy in clinical documentation, they are complex to design and manufacture, and cumbersome to perform clinically. The traditional intraoral Gothic arch, a metal assembly, requires initial recording of the patient's jaw position. An adjustable upper frame is used, a temporary resin base is fabricated, and the occlusal plane is determined. The metal bases of the upper and lower Gothic arches are fixed with self-curing resin, ensuring they are parallel to the occlusal plane. A maxillary metal tracing plate is then installed, maintaining its alignment with the occlusal plane. A single central metal tracing needle is installed in the mandible, its vertical height adjustable by rotation. The tracing needle is perpendicular to the occlusal plane. After the closed-mouth impressions of the upper and lower temporary bases are fixed, the mandible is moved forward and laterally. This creates a tracing trajectory on the maxillary metal tracing plate with a vertices pointing inwards ("↓" shape). The vertices of the movement trajectory are determined, and a perforated resin sheet is aligned with these vertices. The mandible is then occluded, and the tracing needle passes through the perforation and lands at the vertices of the tracing trajectory. A jaw recording silicone pad is then used to fix the upper and lower jaws, obtaining the patient's jaw position record.

[0006] Traditional intraoral Gothic arches can generally only be installed on temporary bases, and cannot be installed on trial dentures in digital complete dentures. During mandibular movement trajectory recording, the operation of a single recording needle may cause instability in the upper and lower temporary bases. Summary of the Invention

[0007] The purpose of this invention is to provide a simplified intraoral Gothic arch and its recording method for recording centric relationships in digital complete dentures. This simplified digital intraoral Gothic arch aims to overcome the complex design and accessories of traditional intraoral Gothic arches, as well as the instability of individual recording pins. Using a digital design and manufacturing method, the simplified intraoral Gothic arch and trial denture are integrated and 3D printed. This allows for not only trial wearing of digital complete dentures to observe the protrusion and aesthetic effects of the anterior teeth, but also intraoral Gothic arch recording of mandibular movement trajectories. It is disposable, requiring no assembly, disassembly, or recycling, thus avoiding potential cross-infection. Furthermore, it is convenient to use, saving clinical time and reducing the treatment time and course of complete denture restoration.

[0008] This application proposes a simplified intraoral Gothic arch for recording the centric relationship of digital complete dentures. The specific technical solution is as follows: it includes: a maxillary recording plate 1, a mandibular fixing plate 2 with recording needles, recording needles 3, and a recording needle retention plate 4; wherein the mandibular fixing plate 2 with recording needles has two transversely arranged recording needles 2 spaced approximately 10 mm apart; the two recording needles have two graduations from top to bottom, each graduation being 1.0 mm high; multiple movable maxillary recording plate raising plates 5 are matched with the maxillary recording plate 1, the thickness of the maxillary recording plate raising plates 5 being 1.0 mm; the maxillary recording plate 1 is located on the maxilla of the digital trial fitting of the complete denture, covering the entire palatal polished surface of the maxilla, and is flush with the occlusal plane; the mandibular fixing plate 2 with recording needles is located on the lingual side of the mandibular anterior teeth and premolars, basically at the same height as the neck of the artificial teeth, and is flush with the occlusal plane;

[0009] The height of the tracing needle 3 can be adjusted according to the intermaxillary distance. The tracing needle is perpendicular to the mandibular tracing needle retention plate 4. There are two cylindrical holes on the tracing needle retention plate 4, and the center distance between the two holes is 10.0 mm. The tracing needle 3 passes through the two holes on the tracing needle retention plate 4 and contacts the maxillary tracing plate 1.

[0010] A layer of tracing powder is sprayed onto the maxillary tracing plate for the trial-fit denture. The upper and lower dentures are then placed into the patient's mouth. The patient is instructed to gently bite down to allow the mandibular tracing needle to contact the maxillary tracing plate, and to perform protrusion and lateral movements of the mandible. After the mandibular movement trajectory is recorded, a tracing trajectory with two vertices on the inner side of the "↓" shape will be obtained on the maxillary tracing plate. The trial-fit denture is removed, and the vertices of the tracing trajectory on the maxillary tracing plate are determined. The center of the two holes of the tracing needle retention plate 4 is aligned with the two tracing vertices on the tracing needle 3, and the tracing needle retention plate 4 is then fixedly bonded to the maxillary tracing plate 1. The trial-fit denture is placed into the patient's mouth again, and the patient is instructed to gently bite down to ensure that the tracing needle 3 passes through the two holes on the tracing needle retention plate 4 and remains in contact with the maxillary tracing plate 1. The maxillary trial-fit denture is then fixed with silicone rubber to obtain the patient's final centric relationship.

[0011] The simplified intraoral Gothic arch claimed in this application can be corrected within ±2.0mm in terms of vertical distance adjustment. If the vertical distance is too high, there are two graduations on the two tracing needles 3 from top to bottom, each graduation being 1.0mm high. The needles can be ground down directly according to the graduations. If the vertical distance is too low, a layer of heightening tracing plate 5 with a thickness of 1.0mm can be glued onto the maxillary tracing plate 1. Up to two layers of heightening tracing plate 5 can be glued on.

[0012] The method for recording the centric relation of a digital complete denture using the simplified intraoral Gothic bow claimed in this application comprises the following steps:

[0013] 1. For edentulous jaws, a two-stage impression method is used to create functional maxillary and mandibular impressions. A super-hard plaster model is then poured in, and the vertical distance within the oral cavity is determined using the resting jaw position method. A simple articulator is then installed.

[0014] 2. Scan the upper and lower jaw ultra-hard plaster models and jaw position records to generate upper and lower jaw model STL files with vertical distance records, import them into digital complete denture design software; design trial dentures;

[0015] 3. Digital complete denture design software: For the maxillary trial denture, place the maxillary recording plate 1 on the tissue surface, flush with the occlusal plane. For the mandibular trial denture, add a mandibular retention plate 2 with recording needles 3 on the anterior lingual side. The mandibular retention plate 2 with recording needles 3 is located on the lingual side of the mandibular anterior teeth and premolars, basically aligned with the neck of the artificial teeth and flush with the occlusal plane. The tips of its two recording needles 3 touch the maxillary recording plate 1, ensuring the mandibular retention plate 2 is parallel to the occlusal plane. Export its STL file.

[0016] 4. Import the complete denture with a simple intraoral Gothic arch into the 3D design software. To prevent interference from the artificial teeth when the mandible moves forward and laterally, cut off half of the crown of the upper and lower posterior teeth in parallel. Generate an STL format file, input it into the 3D printer, and print the denture with the Gothic arch made of polyacetic acid resin (or high-strength resin material).

[0017] 5. Clinical patients return for follow-up visits. Intraoral trial fitting of dentures is performed to check the stability of the upper and lower jaws, the accuracy of the vertical height, and the position of the upper anterior teeth and the overbite-overjet relationship. Ensure that the vertical height is accurate and the position of the anterior teeth is correct. If the vertical distance is too high, the scanning needle 3 can be directly lowered within a range of 2.0 mm according to the scale on the tracing needle 3. If the vertical distance is too low, the upper jaw tracing plate heightening plate 5 can be bonded to the upper jaw tracing plate 1 and adjusted within a range of 2.0 mm. After confirming that the vertical height is accurate, the height of the lower anterior teeth is lowered to ensure that the two lower jaw tracing needles 3 can freely trace the trajectory of the mandibular protrusion and lateral movement on the upper jaw tracing plate 1.

[0018] 6. A layer of marking powder is evenly sprayed onto the surface of the maxillary marking plate 1;

[0019] 7. Fix the upper and lower jaws to try on the dentures. Instruct the patient to bite gently and make forward and lateral movements. The two tracing needles 3 will record two parallel "↓", movement trajectories on the maxillary tracing plate 1. Determine and mark the vertices of the two movement trajectories. Determine that the vertices of the two trajectories are located at the center of the two round holes of the tracing needle retention plate 4. Attach and fix the tracing needle retention plate 4 to the maxillary tracing plate 1.

[0020] 8. Place the upper and lower dentures into the patient's mouth again and instruct the patient to bite gently. Insert the two tracing pins 3 of the lower jaw into the corresponding tracing pin retention plate 4 round holes. After checking that there are no errors, fix the upper and lower dentures with silicone rubber to complete the determination of the patient's centric relationship.

[0021] 9. After scanning and confirming the centric relationship, perform trial fitting of the upper and lower jaw dentures, generate STL format files, import them into digital complete denture design software, and finally complete the fabrication of digital complete dentures.

[0022] Beneficial effects of the present invention

[0023] This invention overcomes the complex structure and cumbersome clinical operation process of the traditional intraoral Gothic arch, and provides a simple and accurate method for determining the centric relationship of digital complete dentures. It is more conducive to improving the overall quality of digital complete denture restoration and is easier to promote and apply in clinical practice.

[0024] First, this design uses digital technology and high-strength resin in one piece, abandoning the complex upper and lower jaw metal retention structure of the traditional intraoral Gothic arch. It does not require installation or special training, saving the cost and time of clinical restoration.

[0025] Secondly, the use of digital manufacturing methods can ensure the complete parallelism of the maxillary and mandibular tracing plates with the occlusal plane, and the absolute perpendicular relationship between the mandibular tracing needle and the maxillary tracing plate, thus improving the accuracy of the tracing, rather than relying on the doctor's experience and mechanical devices.

[0026] Third, the design of double tracing needles with a certain distance between the left and right sides can improve the stability of the denture during the movement of the mandible and reduce unnecessary clinical errors.

[0027] Fourth, the traditional screw-based adjustment of the vertical distance has been replaced with a design that uses a heightening plate on the recording needle with a lowering scale and accurate thickness, allowing for an adjustment of ±2.0mm. This fully meets the clinical needs for vertical distance adjustment. In contrast, conventional screw-based adjustments to the vertical height may result in slight changes in the vertical distance due to external forces during mandibular movement, affecting the accurate recording of the centric relationship.

[0028] Fifth, traditional intraoral Gothic arches are difficult to combine with digital complete dentures. However, simplified intraoral Gothic arches made with digital technology can be printed in one piece with trial dentures. This not only allows for trial fitting of complete dentures, assessment and adjustment of anterior tooth function and aesthetics, but also enables the final determination and verification of the patient's centric relationship, saving clinical operation time and simplifying the clinical process.

[0029] Sixth, the simplified intraoral Gothic arch and the trial-fit complete denture are both made of high-strength digital materials (such as polylactic acid), which are low in cost and can be customized. They are disposable, do not require recycling, and avoid potential cross-infection in clinical settings. In contrast, traditional metal intraoral Gothic arches require experienced technicians and doctors for installation and clinical operation, and require recycling and sterilization. Repeated use can affect the accuracy of the final record.

[0030] Seventh, the combination of simplified intraoral Gothic style and digital complete dentures reduces the difficulty of complete denture restoration, allowing young doctors and experienced doctors alike to produce high-quality complete dentures. It standardizes and ensures the entire digital process of digital complete denture restoration, reduces clinical costs, and is more conducive to the clinical promotion and application of digital complete dentures. Attached Figure Description

[0031] Figure 1 Digital recording of centric relationships in complete dentures using a simplified intraoral Gothic bow.

[0032] Figure 2 Maxillary marking plate heightening plate

[0033] Figure 3 : Recording the centric relationship of digital complete dentures using a simplified intraoral Gothic arch tracing, buccal view

[0034] Figure 4 Digital complete denture centric relation recording was performed using a simplified intraoral Gothic arch for post-operative lateral view.

[0035] Figure label:

[0036] 1. Maxillary sketching board

[0037] 2. Jawline fixation plate with tracing needle

[0038] 3. Recording needle

[0039] 4. Tracing needle retention plate

[0040] 5. Maxillary marking plate, heightening plate Detailed Implementation

[0041] To better understand the purpose, structure, and function of this invention, the following description is in conjunction with the appendix. Figure 1-4The present invention provides a more detailed description of the simplified intraoral Gothic arch and its recording method for digital recording of centric relationships in complete dentures.

[0042] like Figure 1-4 As shown, the simplified intraoral Gothic arch for recording the centric relationship of digital complete dentures in this invention includes: a maxillary recording plate 1, a mandibular fixing plate 2 with recording needles, recording needles 3, and a recording needle retention plate 4; wherein the mandibular fixing plate 2 with recording needles has two transversely arranged recording needles 2 spaced approximately 10 mm apart; the two recording needles have two graduations from top to bottom, each graduation being 1.0 mm high; multiple movable maxillary recording plate raising plates 5 are matched with the maxillary recording plate 1, the thickness of the maxillary recording plate raising plates 5 being 1.0 mm; the maxillary recording plate 1 is located on the maxilla of the digital trial fitting of the complete denture, covering the entire palatal polished surface of the maxilla, and is flush with the occlusal plane; the mandibular fixing plate 2 with recording needles is located on the lingual side of the mandibular anterior teeth and premolars, basically at the same height as the neck of the artificial teeth, and is flush with the occlusal plane;

[0043] The height of the tracing needle 3 can be adjusted according to the intermaxillary distance. The tracing needle is perpendicular to the tracing needle retention plate 4. There are two cylindrical holes on the tracing needle retention plate 4, and the center distance between the two holes is 10.0 mm. The tracing needle 3 passes through the two holes on the tracing needle retention plate 4 and contacts the maxillary tracing plate 1.

[0044] A layer of tracing powder is sprayed onto the tracing plate of the maxillary trial denture. The upper and lower trial dentures are then placed into the patient's mouth. The patient is instructed to gently bite down to allow the mandibular tracing needle to contact the maxillary tracing plate, and to perform protrusion and lateral movements of the mandible. After the mandibular movement trajectory is recorded, a tracing trajectory with two vertices on the inner side of the mandibular tracing plate will be obtained. The maxillary trial denture is removed, and the vertices of the tracing trajectory on the maxillary tracing plate are determined. The center of the two holes of the tracing needle retention plate 4 is aligned with the two tracing vertices on the tracing needle 3, and the tracing needle retention plate 4 is then fixedly bonded to the maxillary tracing plate 1. The maxillary trial denture is placed into the patient's mouth again, and the patient is instructed to gently bite down to ensure that the tracing needle 3 passes through the two holes on the tracing needle retention plate 4 and remains in contact with the maxillary tracing plate 1. The mandibular trial denture is then fixed with silicone rubber to obtain the patient's final centric relationship.

[0045] The simplified intraoral Gothic arch claimed in this invention can be corrected within ±2.0mm in terms of vertical distance adjustment. If the vertical distance is too high, there are two graduations on the two tracing needles 3 from top to bottom, each graduation being 1.0mm high. The needles can be ground down directly according to the graduations. If the vertical distance is too low, a layer of heightening tracing plate 5 with a thickness of 1.0mm can be glued onto the maxillary tracing plate 1. Up to two layers of heightening tracing plate 5 can be glued on.

[0046] The method for recording the centric relation of a digital complete denture using the simplified intraoral Gothic bow claimed in this invention comprises the following steps:

[0047] Step 1: For edentulous jaws, use the two-stage impression method to make functional maxillary and mandibular impressions in the oral cavity, pour in an ultra-hard plaster model, use the resting jaw position method to determine the vertical distance in the oral cavity, and then place a simple articulator.

[0048] Step 2: Scan the upper and lower jaw ultra-hard plaster models and jaw position records to generate upper and lower jaw model STL files with vertical distance records, and import them into digital complete denture design software; design trial dentures;

[0049] Step 3: Using digital complete denture design software, place the maxillary recording plate 1 on the tissue surface of the maxillary trial denture, flush with the occlusal plane. Add a mandibular retention plate 2 with recording needles 3 to the anterior lingual side of the mandibular trial denture. The mandibular retention plate 2 with recording needles 3 is located on the lingual side of the mandibular anterior teeth and premolars, basically aligned with the neck of the artificial teeth and flush with the occlusal plane. The tips of its two recording needles 3 touch the maxillary recording plate 1, ensuring that the mandibular retention plate 2 with recording needles is parallel to the occlusal plane. Export its STL file.

[0050] Step 4: Import the complete denture with a simplified intraoral Gothic arch into the 3D design software. Cut off half of the crown of the upper and lower posterior teeth in parallel to generate an STL format file. Input the file into the 3D printer and print the denture with a simplified intraoral Gothic arch made of polyacetic acid resin (or high-strength resin material).

[0051] Step 5: Clinical patient follow-up visit, intraoral trial fitting of dentures, checking the stability of the upper and lower jaw trial fitting dentures, the accuracy of vertical height, and checking the position of the upper anterior teeth and overbite / overjet relationship; ensure the vertical height is accurate and the anterior teeth are in the correct position. If the vertical distance is too high, the scanning needle 3 can be directly lowered within a range of 2.0mm according to the scale on the tracing needle 3. If the vertical distance is too low, the upper jaw tracing plate heightening plate 5 can be bonded to the upper jaw tracing plate 1 and adjusted within a range of 2.0mm. After confirming the vertical height is accurate, the height of the lower anterior teeth is lowered to ensure that the two lower jaw tracing needles 3 can freely trace the trajectory of mandibular protrusion and lateral movement on the upper jaw tracing plate 1.

[0052] Step 6: Spray a layer of marking powder evenly onto the surface of the maxillary marking plate 1;

[0053] Step 7: Fix the upper and lower jaws to try on the dentures. Instruct the patient to bite gently and make forward and lateral movements. The two tracing needles 3 will record two parallel "↓" shaped movement trajectories on the maxillary tracing plate 1. Determine and mark the vertices of the two movement trajectories. Determine that the vertices of the two trajectories are located at the center of the two round holes of the tracing needle retention plate 4. Attach and fix the tracing needle retention plate 4 to the maxillary tracing plate 1.

[0054] Step 8: Place the upper and lower jaw dentures into the patient's mouth again, instruct the patient to bite gently, insert the two tracing pins 3 of the lower jaw into the corresponding tracing pin retention plate 4 round holes, and after checking that there are no errors, fix the upper and lower jaw dentures with silicone rubber to complete the determination of the patient's centric relationship.

[0055] Step 9: After scanning and confirming the centric relationship, try on the upper and lower jaw dentures, generate an STL format file, import it into the digital complete denture design software, and finally complete the fabrication of the digital complete denture.

[0056] The present invention relates to a simplified intraoral Gothic arch and its recording method for recording centric relationships in digital complete dentures. This invention overcomes the complex structure and cumbersome clinical procedures of traditional intraoral Gothic arches, providing a simple and accurate method for determining centric relationships in digital complete dentures. This is more conducive to improving the overall quality of digital complete denture restorations and is easier to promote and apply clinically. It has the following beneficial effects:

[0057] (1) The simplified intraoral Gothic arch and its recording method for digital recording of centric relation of complete dentures of the present invention adopts digital technology and is made of high-strength resin in one piece. It abandons the complex upper and lower jaw metal retention structure of traditional intraoral Gothic arches. It does not require installation or special training, saving the cost and time of clinical restoration.

[0058] (2) The present invention provides a simplified intraoral Gothic arch and its recording method for recording the centric relationship of digital complete dentures. The digital manufacturing method can ensure that the maxillary and mandibular recording plates are completely parallel to the occlusal plane and that there is an absolute perpendicular relationship between the mandibular recording needle and the maxillary recording plate, which improves the accuracy of the recording, rather than relying on the doctor's experience and mechanical devices to determine it.

[0059] (3) The simple intraoral Gothic arch of the present invention for recording the centric relationship of digital complete dentures adopts a double tracing needle design with a certain distance between the left and right sides, which can improve the stability of the mandible during the trial fitting of dentures and reduce unnecessary clinical errors.

[0060] (4) The traditional screw rotation adjustment of vertical distance is replaced by a design of a height plate on the recording needle with a scale reduction and accurate thickness, which can be adjusted by ±2.0mm, which can fully meet the clinical needs of vertical distance height adjustment. The traditional screw adjustment of vertical height may be affected by external force during mandibular movement, resulting in a slight change in vertical distance, which affects the accurate recording of the centric relationship.

[0061] (5) Traditional intraoral Gothic arches are difficult to combine with digital complete dentures. However, the simplified intraoral Gothic arches made with the digital technology of this invention are printed in one piece with trial dentures. This not only allows for trial fitting of complete dentures, evaluation and adjustment of anterior tooth function and aesthetics, but also allows for final determination and verification of the patient's centric relationship, saving clinical operation time and simplifying the clinical process.

[0062] (6) The simplified intraoral Gothic arch and trial-fit complete denture are both made of high-strength digital materials (such as polylactic acid), which are low in cost and can be customized. They are disposable and do not require recycling, avoiding potential cross-infection in clinical settings. In contrast, traditional metal intraoral Gothic arches require experienced technicians and doctors for installation and clinical operation, and require recycling and sterilization. Repeated use can affect the accuracy of the final record.

[0063] (7) The present invention combines simplified intraoral Gothic style with digital complete dentures, reducing the difficulty of complete denture restoration and allowing both young and experienced doctors to produce high-quality complete dentures. It standardizes and guarantees the entire digital process of digital complete denture restoration, reduces clinical costs, and is more conducive to the clinical promotion and application of digital complete dentures.

[0064] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific descriptions herein should not be construed as limiting the substance and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

Claims

1. A simple intraoral gothic arch for digitalizing centric relation record of complete denture, characterized in that, The simple intraoral Gothic arch is integrated with the 3D printing of the digital try-on complete denture; the simple intraoral Gothic arch comprises: a maxillary tracing plate (1), a mandibular fixed plate with tracing needles (2), tracing needles (3), a tracing needle retention plate (4), and a maxillary tracing plate heightening plate (5); The mandibular fixed plate with tracing needles (2) has two laterally arranged tracing needles (3); the two tracing needles (3) are marked with scales; The two cylindrical holes on the tracing needle retention plate (4); the tracing needles (3) pass through the two holes on the tracing needle retention plate (4) and contact the maxillary tracing plate (1); The movable maxillary tracing plate heightening plate (5) is matched with the maxillary tracing plate (1).

2. The simple intraoral Gothic arch for digital complete denture centric relation recording according to claim 1, characterized in that: The maxillary tracing plate (1) is located on the maxillary of the digital complete denture and covers the entire polished palatal surface of the maxilla, which is parallel to the occlusal plane; The mandibular fixed plate with tracing needles (2) is located on the lingual side of the mandibular anterior teeth and bicuspid teeth, which is basically the same height as the neck of the artificial tooth and is parallel to the occlusal plane.

3. The simple intraoral Gothic arch for digital complete denture centric relation recording according to claim 2, characterized in that: Spray a layer of tracing powder on the maxillary tracing plate (1) of the maxillary denture, then place the upper and lower dentures in the mouth, and let the patient lightly bite so that the mandibular tracing needles (3) contact the maxillary tracing plate (1); the mandible is moved forward and laterally; When the mandibular movement trajectory tracing is completed, the tracing trajectory with two top points located on the inner side "↓" shape will be obtained on the maxillary tracing plate (1); Remove the maxillary denture, determine the top points of the tracing trajectory on the maxillary tracing plate (1), align the two tracing top points on the tracing needles (3) with the centers of the two holes on the tracing needle retention plate (4), and then fix and bond the tracing needle retention plate (4) to the maxillary tracing plate (1); Place the maxillary denture in the mouth again, lightly bite to ensure that the tracing needles (3) pass through the two holes on the tracing needle retention plate (4) and contact the maxillary tracing plate (1) to remain stationary, fix the upper and lower try-on dentures with occlusal recording silicone rubber, and obtain the final centric relation of the patient.

4. The simplified in-mouth gothic arch for digitalizing centric relation record of complete denture as claimed in claim 1 wherein, The height of the tracing needle (3) is adjusted according to the interarch distance.

5. A method for recording the centric relation of a digital complete denture using the simple intraoral Gothic arch of claim 1, the specific steps being: Step 1: In the edentulous jaw, a functional upper and lower impression is made using the two-step impression method, a plaster model is poured, the vertical distance of the patient is determined using the rest position method, and a simple articulator is used; Step 2: Scan the upper and lower plaster models and jaw position records to form upper and lower model stl files with vertical distance records, import them into digital complete denture design software, and design the denture. Step 3, digital complete denture design software, the tissue surface of the maxillary trial denture is placed with a maxillary tracing plate (1), which is parallel to the occlusal plane, and the anterior lingual side of the mandibular trial denture is added with a mandibular tracing needle fixing plate (2) with tracing needles (3), which is located on the lingual side of the mandibular anterior teeth and bicuspid teeth, basically in line with the neck of the artificial tooth, and parallel to the occlusal plane; the two tracing needle tips touch the maxillary tracing plate (1), ensuring that the mandibular tracing needle fixing plate (2) is parallel to the jaw plane, and the stl file is exported; Step 4, import the complete trial denture with a simple intraoral gothic arch into the 3D design software, cut off 1 / 2 height of the upper and lower posterior teeth, generate stl format file, and input 3D printer; print the digital trial complete denture with a simple intraoral gothic arch; Step 5, place the trial digital complete denture in the mouth, check the stability of the upper and lower dentures, the accuracy of the vertical height, and the position of the upper anterior teeth and the overbite and overjet relationship; ensure the accuracy of the vertical height and the correct position of the anterior teeth, and ensure that the two tracing needles (3) can freely trace the trajectory of the mandibular protrusion and lateral movement on the maxillary tracing plate (1); Step 6, evenly spray a layer of tracing powder on the surface of the maxillary tracing plate (1); Step 7, fix the upper and lower trial dentures, gently occlude, and make protrusion and left and right lateral movement, the two tracing needles (3) will trace two parallel "↓" shaped movement trajectories on the maxillary tracing plate (1), determine the top points of the two movement trajectories and mark them, determine that the top points of the two tracing trajectories are located at the centers of the two circular holes of the tracing needle fixing plate (4), and bond the tracing needle fixing plate (4) to the maxillary tracing plate (1); Step 8, place the upper and lower trial dentures in the patient's mouth again, ask the patient to lightly occlude, insert the two tracing needles (3) into the corresponding circular holes of the tracing needle fixing plate (4), check if it is correct, and then occlude the recording silicon rubber to fix the upper and lower dentures, and complete the determination of the centric relation of the patient; Step 9, scan the upper and lower trial dentures after determining the centric relation, generate stl format file, import into digital complete denture design software, and finally complete the production of digital complete denture.

6. The recording method of claim 5, wherein: In step 5, if the vertical distance is too high, the scanning needle (3) can be directly adjusted within 2.0 mm according to the scale on the tracing needle (3); if the vertical distance is too low, the maxillary tracing plate heightening plate (5) can be bonded to the maxillary tracing plate (1) within 2.0 mm.

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