Method for determining occlusion relation of edentulous patient based on 3D modeling

Abstract

The invention relates to a method for determining an occlusion relationship of an edentulous patient based on 3D modeling, and the method comprises the steps: constructing a head 3D real person model based on a historical front face picture of the patient without tooth loss; based on the head 3D real person model, designing a transparent mask of a 1 / 3 contour below the face during normal facial expression, and performing 3D printing on the transparent mask; preparing an edentulous jaw model of the patient, preparing a full-mouth wax base plate model, preliminarily determining an occlusion relationship, comparing the fitting degree of the 1 / 3 contour below the surface of the patient and a transparent mask, adaptively adjusting the full-mouth wax base plate model, and preparing a temporary full denture; the temporary complete denture is properly adjusted according to the occlusion and face capacity of the temporary complete denture tried by the patient and the fitting degree of the 1 / 3 contour below the face and the transparent mask, and the formal complete denture is manufactured after the patient wears the complete denture properly and the face capacity is satisfied. Compared with the prior art, a patient can be helped to recover the original 1 / 3 profile and fullness under the surface, and the requirement of the patient for the attractive appearance of complete denture repair is met.

Description

Technical Field

[0001] The present invention relates to the technical field of oral restoration, and in particular to a method for determining the occlusal relationship of an edentulous patient based on 3D modeling. Background Art

[0002] As they age, more and more elderly people are experiencing complete tooth loss, which in turn affects their quality of life and necessitates full denture restoration. Through trial fitting and repeated modifications of full dentures, the chewing function of the elderly in their daily lives can be improved.

[0003] A major clinical challenge currently encountered is the significant difference between a patient's facial expression after tooth loss and when their teeth remain. Dentists often lack a detailed understanding of a patient's normal appearance. Even if they do, traditional full denture fabrication methods make it difficult to achieve a normal appearance through denture restoration from a clinical technical perspective. Ultimately, while full denture restoration can restore normal chewing function in the elderly, the patient's appearance will still differ somewhat from their normal state, a reality that patients are forced to accept.

[0004] After searching, Chinese invention patent application publication number CN118267137A discloses a full-process digital personalized full denture production method, including the following steps: Step 1: Obtain a 3D image dataset of the patient's oral and maxillofacial area; Step 2: Import the 3D image dataset into image processing software, 3D reconstruct the oral and maxillofacial images, and obtain a 3D oral model; Step 3: Obtain a neutral zone in the 3D oral model and determine the edge position of the base based on the position of the neutral zone; Step 4: Determine the centric position based on the joint position in the 3D oral model; Step 5: Manually select appropriate artificial teeth in the image processing software and arrange them according to the centric position and the distribution of the base within the mouth to obtain a full denture model; Step 6: 3D print the full denture model for the patient. This existing patent application uses 3D modeling based on image data of patients with missing teeth. Therefore, the resulting full denture model cannot restore normal facial expressions.

[0005] How to restore normal facial expressions for edentulous patients after wearing dentures has become a technical problem that needs to be solved. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a method for determining the occlusal relationship of edentulous patients based on 3D modeling.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, a method for determining the occlusal relationship of an edentulous patient based on 3D modeling is provided, the method comprising the following steps:

[0009] Step 1: Based on the patient's historical frontal facial photos before tooth loss, a 3D head model is constructed using an artificial intelligence model.

[0010] Step 2: scaling the 3D head model obtained in step 1 in the same proportion according to the patient's current facial proportions to form a 3D real-life head model; designing a transparent mask for the lower 1 / 3 of the face when in a normal facial expression based on the model, and 3D printing the transparent mask for the lower 1 / 3 of the face;

[0011] Step 3: Prepare the patient's edentulous jaw model, make a full-mouth wax base, and preliminarily determine the occlusal relationship;

[0012] Step 4: Compare the fit between the lower 1 / 3 of the patient's face and the transparent mask, and adjust the full-mouth wax base and Adaptive adjustments were made to the embankment to produce a temporary full denture;

[0013] Step 5: Adjust the temporary denture based on the patient's occlusion, facial features, and the fit between the lower 1 / 3 of the face contour and the transparent mask. Once the patient is comfortable with the denture and satisfied with the appearance, make the formal denture.

[0014] Preferably, in step 1, the process of constructing a 3D head model using an artificial intelligence model includes:

[0015] Step 101: deploy an artificial intelligence model for 3D facial reconstruction;

[0016] Step 102: Collect historical frontal facial photos of the patient without missing teeth;

[0017] Step 103: Input the patient's historical frontal facial photos into the artificial intelligence model to build a 3D head model, thereby forming a 3D head model of the patient with a normal facial expression;

[0018] Step 104: Communicate with the patient, discuss the facial similarity, adjust the head 3D model again, and obtain the patient's approval.

[0019] More preferably, the process of constructing the 3D real-person head model includes:

[0020] Step 201: In the 3D head model, measure the vertical distance from the hairline to the center of the eyebrows and record it as d;

[0021] Step 202: In the 3D head model, measure the vertical distance from the center of the eyebrows to the lower edge of the nose, and record it as c;

[0022] Step 203: In the 3D head model, measure the vertical distance from the corner of the eye to the mouth, and record it as b;

[0023] Step 204: Based on the patient's current facial condition, measure the vertical distance from the hairline to the center of the eyebrows and record it as d';

[0024] Step 205: Based on the patient's current facial condition, measure the vertical distance from the center of the eyebrows to the lower edge of the nose, and record it as c';

[0025] Step 206: Based on the patient's current facial condition, measure the vertical distance from the corner of the eye to the mouth cleft and record it as b';

[0026] Step 207: Compare the values ​​of b, c, d with the values ​​of b', c', d' to obtain the corresponding proportional relationship;

[0027] Step 208: extract the two sets of ratio values ​​with the closest ratios, and take the average value as the final model scaling ratio;

[0028] Step 209: scaling the constructed head 3D model according to the scaling ratio to form a head 3D real person model.

[0029] Preferably, the manufacturing process of the transparent mask includes:

[0030] Step 210: Designing a transparent mask of the lower 1 / 3 contour of the face during normal facial expression based on the 3D real-life head model, wherein the lower 1 / 3 contour includes the contour of the upper lip and the contour of the lower lip;

[0031] Step 211: Use a 3D printer to print a transparent mask with the contour of the lower 1 / 3 of the face.

[0032] Preferably, the process of making a full-mouth wax-based model includes:

[0033] Step 301: Take an impression of the patient's edentulous jaw and generate an upper and lower jaw oral model of the patient's current actual situation;

[0034] Step 302: Prepare a full-mouth wax-based model based on the upper and lower jaw oral models;

[0035] Step 303: Adjust the upper and lower edges of the full-mouth wax-based model according to the conventional method for determining the occlusal relationship of full-mouth dentures. The height of the embankment is used to preliminarily determine the occlusal relationship.

[0036] Preferably, in step 4, the process of making a temporary complete denture includes:

[0037] Step 401: Place the full-mouth wax-based model in the patient's mouth; place the 3D printed transparent mask extension rods on the upper and lower Between the dikes;

[0038] Step 402: Modify the upper and lower parts by repeated adjustments Plane, confirm the vertical height, then The notch is made on the bank so that the upper and lower parts can be accurately fixed by the extension rod. embankment;

[0039] Step 403: Adjust the full-mouth wax-based model based on the fit between the lower 1 / 3 contour of the patient's face and the 3D printed transparent mask.

[0040] More preferably, the adjustment of the full-mouth wax base model is specifically as follows: if the facial skin is squeezed, the wax is reduced on the lip and cheek sides of the full-mouth wax base model; if there are gaps in the facial skin, the wax is increased on the lip and cheek sides of the full-mouth wax base model; for normally compressed areas, no adjustment is required.

[0041] Preferably, the process of making a formal complete denture includes:

[0042] Step 501: Analyze the occlusion, facial features, and fit of the lower 1 / 3 of the face contour with the transparent mask of the patient trying on the temporary complete denture, and adjust the temporary complete denture;

[0043] Step 502: Repeated debugging and communication with the patient until the patient is comfortable with the dentures and satisfied with their appearance, and then a formal full denture is made.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1) The present invention uses a normal historical frontal facial photograph of the patient before tooth loss and 3D reconstruction modeling technology to construct a 3D real-life head model. Based on the 3D real-life model, a transparent mask with the contour of the lower 1 / 3 of the face when making a normal facial expression is designed and 3D printed. When the occlusal relationship of the full denture is determined, the occlusal relationship is adjusted based on the fit of the transparent mask, and repeated comparisons and adjustments are made to let the patient understand the effect of the restoration in advance, thereby achieving the maximum restoration of the normal facial expression before tooth loss after wearing the denture, avoiding differences in understanding between the two parties after the subsequent restoration is completed.

[0046] 2) The present invention uses 3D modeling and 3D printing technologies to restore the facial morphology of edentulous patients with normal dentition when their teeth are intact, and realizes the production of a transparent mask that covers the contour of the lower 1 / 3 of the face. This provides a reference for doctors to repair, solves the problem that traditional solutions cannot effectively evaluate the fullness of the lower 1 / 3 of the face, and no longer relies entirely on the doctor's personal experience, which greatly improves the acceptance of patients wearing full denture restorations.

[0047] 3) The full denture restoration achieved by the present invention, with the help of modeling technology, determines the size of the restoration in advance, improves the quality of the final full denture restoration, and reduces the number of times the patient needs to undergo full denture restoration adjustments due to dissatisfaction with the appearance. On the one hand, it reduces the workload of the doctor, and on the other hand, it saves the patient's time for multiple medical visits.

[0048] 4) The method of the present invention has been confirmed through follow-up visits and has received positive feedback from patients. Patients generally report that it is very effective in daily use, and it also provides a scientific and effective means for the clinical restoration of complete dentures. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the process of determining the occlusal relationship of an edentulous patient in the present invention;

[0050] Figure 2 Schematic diagram of facial surface proportion points;

[0051] Figure 3 Schematic diagram of the overall operation process of the present invention; DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0053] Example 1

[0054] This embodiment relates to a method for determining the occlusal relationship of an edentulous patient based on 3D modeling. Figure 1 , the method comprises the following steps:

[0055] Step 1: Collect historical frontal photos of edentulous patients and construct a 3D head model using an artificial intelligence model;

[0056] Step 2: The 3D head model is enlarged in proportion to the patient's current facial proportions to form a 3D real-life head model; a transparent mask that covers the lower 1 / 3 of the face when in a normal facial expression is designed based on the model, and the transparent mask that covers the lower 1 / 3 of the face is printed using a 3D printer;

[0057] Step 3: Based on the patient's current oral conditions, a full-mouth wax-based model is made to preliminarily determine the occlusal relationship;

[0058] Step 4: According to the fit between the lower 1 / 3 of the face contour and the transparent mask, the full-mouth wax-based model is adaptively adjusted to produce a temporary full-mouth denture;

[0059] Step 5: Adjust the temporary denture according to the occlusal condition of the trial denture and the fit between the lower 1 / 3 contour of the face and the transparent mask. After the patient is comfortable wearing it, make the formal denture.

[0060] In step 1, the process of building a 3D head model using the AI ​​model includes:

[0061] Step 101: deploy an artificial intelligence model for 3D facial reconstruction;

[0062] Step 102: Collect historical frontal facial photos of the edentulous patient without missing teeth;

[0063] Step 103: Input the patient's historical frontal facial photos into the artificial intelligence model to build a 3D head model, thereby forming a 3D head model of the patient with a normal facial expression;

[0064] Step 104: Based on the patient's historical frontal facial photograph, simulate the facial proportion relationship under normal facial expression in the head 3D model, including the longitudinal proportion and the lateral proportion.

[0065] In the head 3D model, such as Figure 2 , measure the vertical distance from the top of the head to the middle of the eyebrows, record it as d; measure the vertical distance from the middle of the eyebrows to the bottom of the nostrils, record it as c; measure the vertical distance from the corner of the eye to the middle of the lips, record it as b; measure the distance from the bottom of the nostrils to the lower jaw, record it as a.

[0066] In step 2, a 3D real-life head model is constructed; based on this model, a transparent mask is designed and printed to cover the lower 1 / 3 of the face when in normal facial expression. The process includes:

[0067] Step 201: Measure the actual facial proportions of the edentulous patient and input the actual data into the created 3D head model, thereby constructing a 1:1 real-life 3D head model in a computer.

[0068] Step 202: Based on the 3D real-life head model, a transparent mask of the lower 1 / 3 of the face contour during normal facial expression is constructed, including the upper lip surface contour model and the lower lip surface contour model.

[0069] Step 203: Use a 3D printer to print a transparent mask covering the lower 1 / 3 of the face contour when the 3D real-life model is in normal facial expression.

[0070] In step 3, a model is prepared based on the patient's current edentulous jaw condition, and a full-mouth wax-based model is produced. This process includes the following steps:

[0071] Step 301, arranging the patient to lie supine on a dental chair;

[0072] Step 302: Mix the oral impression material and complete relevant preparations before oral impression taking;

[0073] Step 303: Using the molding material, a mold of the patient's current oral cavity is taken to generate an edentulous upper and lower jaw model of the current actual situation;

[0074] Step 304: A full-mouth wax-based model is made based on the upper and lower edentulous jaw models to preliminarily determine the occlusal relationship.

[0075] In step 4, the vertical height and lateral projection of the patient's complete denture are determined using a transparent mask printed by a 3D printer, including the following steps:

[0076] Step 401: Place the full-mouth wax-based model in the patient's mouth to preliminarily determine the occlusal relationship;

[0077] Step 402: Place the 3D printed transparent mask extension rods on the upper and lower Between the dikes, by repeatedly adjusting and modifying the upper and lower Plane, confirm the vertical height, then The notch is made on the bank so that the upper and lower parts can be accurately fixed by the extension rod. embankment;

[0078] Step 403: Mark and adaptively adjust the full-mouth wax-up model based on the fit between the lower 1 / 3 of the face contour and the transparent mask: if the facial skin is squeezed, wax reduction is performed on the lip and cheek sides of the full-mouth wax-up model; if there is a gap in the facial skin, wax addition is performed on the lip and cheek sides of the full-mouth wax-up model; for areas with normal pressure, no adjustment is required;

[0079] Step 404: through repeated modification and fit comparison evaluation of the above steps, the occlusal relationship of the full denture wearing the full wax-based model is finally confirmed.

[0080] refer to Figure 3 The above is the entire process of the present invention, and the detailed steps include:

[0081] Step 1-1: Collect historical frontal photos of the patient, which will be used for manual 3D simulation modeling later.

[0082] Step 1-2, build a 3D face model with the help of artificial intelligence 3D modeling model.

[0083] Steps 1-3: Repeated communication with the patient to adjust the 3D facial model until the patient finally approves it.

[0084] Steps 1-4: Adjust the model to the current real face proportions based on the patient's actual facial proportion distribution, and further communicate with the patient to confirm and adjust until the patient approves.

[0085] Steps 1-5: Set the 3D printing area around the lower 1 / 3 of the face contour, and use 3D printing to output the solid transparent mask shape of the lips in the selected area as a subsequent comparison template.

[0086] Steps 1-6: Using the impression material, a model of the patient's actual oral morphology is obtained. Based on the impression model, a wax-based model is made.

[0087] Steps 1-7: Place the full-mouth wax-based model inside the patient's mouth and use the full-mouth wax-based model to preliminarily determine the occlusal relationship according to traditional restoration methods.

[0088] Steps 1-8: Place the 3D-printed lower 1 / 3 transparent mask on the patient's face and adjust the vertical height and lateral convexity based on the observed fit.

[0089] Steps 1-9: Submit the final fully fitted wax-based model for temporary full denture production.

[0090] Steps 1-10: Place the successfully manufactured temporary full denture in the patient's mouth and make minor adjustments to the occlusion based on the patient's trial results. Compare and adjust the fit of the 3D lip transparent mask.

[0091] Steps 1-11: After the patient has tried on the temporary full denture and adapted to it, the final full denture is made and the patient can start wearing it daily.

[0092] Steps 1-12: Based on the follow-up of the patients, communication and feedback on the daily use of the complete dentures, any problems that arise, and their feedback are provided to complete the entire course of treatment.

[0093] The method of the present invention has been confirmed through subsequent follow-up visits and has received positive feedback from edentulous patients. Patients generally report that it is very effective in daily use, thus providing a scientific and effective means for the clinical restoration of complete dentures.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for determining the occlusal relationship of an edentulous patient based on 3D modeling, characterized in that: The method comprises the following steps: Step 1: Based on the patient's historical frontal facial photos before tooth loss, a 3D head model is constructed using an artificial intelligence model. Step 2: scaling the 3D head model obtained in step 1 in the same proportion according to the patient's current facial proportions to form a 3D real-life head model; designing a transparent mask for the lower 1 / 3 of the face when in a normal facial expression based on the model, and 3D printing the transparent mask for the lower 1 / 3 of the face; Step 3: Prepare the patient's edentulous jaw model, make a full-mouth wax base, and preliminarily determine the occlusal relationship; Step 4: Compare the fit between the lower 1 / 3 of the patient's face and the transparent mask, and adjust the full-mouth wax base and Adaptive adjustments were made to the embankment to produce a temporary full denture; Step 5: Adjust the temporary denture based on the patient's occlusion, facial features, and the fit between the lower 1 / 3 of the face contour and the transparent mask. Once the patient is comfortable with the denture and satisfied with the appearance, make the formal denture.

2. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 1, characterized in that: In step 1, the process of constructing a 3D head model using an artificial intelligence model includes: Step 101: deploy an artificial intelligence model for 3D facial reconstruction; Step 102: Collect historical frontal facial photos of the patient without missing teeth; Step 103: Input the patient's historical frontal facial photos into the artificial intelligence model to build a 3D head model, thereby forming a 3D head model of the patient with a normal facial expression; Step 104: Communicate with the patient, discuss the facial similarity, adjust the head 3D model again, and obtain the patient's approval.

3. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 2, characterized in that: The process of constructing the 3D real-life head model includes: Step 201: In the 3D head model, measure the vertical distance from the hairline to the center of the eyebrows and record it as d; Step 202: In the 3D head model, measure the vertical distance from the center of the eyebrows to the lower edge of the nose, and record it as c; Step 203: In the 3D head model, measure the vertical distance from the corner of the eye to the mouth, and record it as b; Step 204: Based on the patient's current facial condition, measure the vertical distance from the hairline to the center of the eyebrows and record it as d'; Step 205: Based on the patient's current facial condition, measure the vertical distance from the center of the eyebrows to the lower edge of the nose, and record it as c'; Step 206: Based on the patient's current facial condition, measure the vertical distance from the corner of the eye to the mouth cleft and record it as b'; Step 207: Compare the values ​​of b, c, d with the values ​​of b', c', d' to obtain the corresponding proportional relationship; Step 208: extract the two sets of ratio values ​​with the closest ratios, and take the average value as the final model scaling ratio; Step 209: scaling the constructed head 3D model according to the scaling ratio to form a head 3D real person model.

4. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 1, characterized in that: The production process of the transparent mask includes: Step 210: Designing a transparent mask of the lower 1 / 3 contour of the face during normal facial expression based on the 3D real-life head model, wherein the lower 1 / 3 contour includes the contour of the upper lip and the contour of the lower lip; Step 211: Use a 3D printer to print a transparent mask with the contour of the lower 1 / 3 of the face.

5. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 1, characterized in that: The process of making a full-mouth wax-based model includes: Step 301: Take an impression of the patient's edentulous jaw and generate an upper and lower jaw oral model of the patient's current actual situation; Step 302: Prepare a full-mouth wax-based model based on the upper and lower jaw oral models; Step 303: Adjust the upper and lower edges of the full-mouth wax-based model according to the conventional method for determining the occlusal relationship of full-mouth dentures. The height of the embankment is used to preliminarily determine the occlusal relationship.

6. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 1, characterized in that: In step 4, the process of making a temporary complete denture includes: Step 401: Place the full-mouth wax-based model in the patient's mouth; place the 3D printed transparent mask extension rods on the upper and lower Between the dikes; Step 402: Modify the upper and lower parts by repeated adjustments plane, confirm the vertical height, then The notch is made on the bank so that the upper and lower parts can be accurately fixed by the extension rod. embankment; Step 403: Adjust the full-mouth wax-based model based on the fit between the lower 1 / 3 contour of the patient's face and the 3D printed transparent mask.

7. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 6, characterized in that: The adjustment of the full-mouth wax base model is specifically as follows: if the facial skin is squeezed, the lip and cheek sides of the full-mouth wax base model are reduced in wax; if there are gaps in the facial skin, the lip and cheek sides of the full-mouth wax base are increased in wax; for normal pressure areas, no adjustment is required.

8. The method for determining the occlusal relationship of an edentulous patient based on 3D modeling according to claim 1, characterized in that: The process of making a formal complete denture includes: Step 501: Analyze the occlusion, facial features, and fit of the lower 1 / 3 of the face contour with the transparent mask of the patient trying on the temporary complete denture, and adjust the temporary complete denture; Step 502: Repeated debugging and communication with the patient until the patient is comfortable with the dentures and satisfied with their appearance, and then a formal full denture is made.

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