A method and system for depth control of a dental instrument

Abstract

The application discloses a tooth depth setting method and system, and relates to the technical field of tooth processing. The tooth depth setting method comprises the following steps: constructing a target restoration according to body information of a target object; determining a grinding thickness of the target object according to the target restoration; measuring the target restoration from multiple angles to obtain a measurement distance between a drill-in point of the target object and a drill of a depth setting tool at each angle; and determining a depth setting distance of the drill into the target object according to the measurement distance and the grinding thickness. The application can more scientifically and accurately calculate the depth setting distance. Based on the accurate depth setting distance, the accuracy of tooth processing can be improved, and the safety of operation can be improved.

Description

Technical Field

[0001] This invention relates to the field of dental processing technology, specifically to a method and system for determining the depth of teeth. Background Technology

[0002] Cosmetic dentistry is becoming increasingly popular, and obtaining oral data often requires using burs to determine the depth of the teeth. Typically, the depth of the bur's penetration is determined by the operator using methods such as embedding the bur into the tooth to create a groove (e.g., using a torpedo-shaped or other shaped bur), or by the vertical insertion of a spherical bur into the cavity and the angle at which the bur shank is positioned to secure it to the outer edge of the cavity. These methods are highly dependent on the operator's skill level, resulting in varying levels of precision. For example, inexperienced operators often fail to achieve sufficient depth, leading to poorly shaped dental restorations, hindering normal tooth movement or self-cleaning, and even causing temporomandibular joint disorders, gingival or periodontal symptoms. Conversely, excessive depth removal can expose dentin and potentially cause iatrogenic inflammation or necrosis of the pulp. Therefore, relying solely on visual inspection or experience for depth determination inevitably results in a discrepancy between the actual and designed depth. Thus, current techniques for determining tooth depth suffer from subjectivity and low precision. Summary of the Invention

[0003] The purpose of this invention is to address the problems of subjective and low-precision tooth depth determination in existing dental processing techniques. This invention proposes a tooth depth determination method that constructs a target restoration based on the target object, further confirms the grinding thickness, and measures the target restoration from multiple angles to obtain the distance between the bur and the drilling point of the target object at each angle. This distance is then combined with the grinding thickness to calculate the depth determination distance, enabling a more scientific and accurate calculation of the depth determination distance and improving the precision and safety of tooth processing.

[0004] In a first aspect, one technical solution provided in this embodiment of the invention is a method for determining the depth of teeth, the method comprising the following steps: Construct the target repair body based on the ontology information of the target object; The abrasion thickness of the target object is determined based on the target restoration. The target restoration is measured from multiple angles to obtain the measured distance between the bur of the depth-fixing tool and the drilling point of the target object at each angle. The depth at which the needle enters the target object is determined based on the measured distance and the grinding thickness.

[0005] Optionally, the ontological information includes soft tissue thickness information of the tooth, tooth body thickness information, and tooth external morphology. Before constructing the target restoration based on the ontological information of the target object, the method further includes: Determine whether the target object is complete; If the target object has a complete structure, the soft tissue thickness information, tooth body thickness information, and tooth external morphology of the tooth are obtained by scanning the target object. If the target object structure is missing, the missing tissue is reconstructed using a model and the target object is scanned to obtain information on the soft tissue thickness, tooth body thickness, and tooth external morphology.

[0006] Optionally, determining the abrasion thickness of the target object based on the target restoration includes: The abrasion thickness of the target object is determined based on the thickness of the target repair body and the preset standard thickness.

[0007] Optionally, the depth-fixing device further includes multiple ranging lenses set at different angles. The multi-angle measurement of the target restoration body, obtaining the measured distance between the bur of the depth-fixing device and the drilling point of the target object at each angle, includes: The external morphology of the target repair body is measured from multiple angles by the ranging lenses set at different angles in the depth-fixing device, and the measurement value corresponding to each angle is obtained. The measured value at each angle is compared with the preset length of the needle to determine the measured distance between the needle and the drilling point of the target object at different tilt angles.

[0008] Optionally, determining the depth at which the depth-fixing tool enters the target object based on the measured distance and the grinding thickness includes: Based on the measured distance between the bur and the drilling point of the target object and the grinding thickness of the target object, the total distance the bur penetrates into the target object based on the drilling point is determined, and the total distance is the fixed depth distance.

[0009] Optionally, after determining the total distance the bur penetrates into the target object based on the measured distance between the bur and the drilling point of the target object and the grinding thickness of the target object, the method further includes: after the bur enters the target object, measuring the distance in real time through the ranging lens and comparing it with the fixed depth distance to determine whether the bur has reached the fixed depth distance.

[0010] Secondly, an embodiment of the present invention also provides a tooth depth determination system, the system comprising: The building module is used to construct the target repair body based on the ontology information of the target object; The first acquisition module is used to determine the abrasion thickness of the target object based on the target repair body; The measurement module is used to measure the target restoration from multiple angles and obtain the measured distance between the bur of the depth-fixing tool and the drilling point of the target object at each angle. A depth-determining module is used to determine the depth at which the needle enters the target object based on the measured distance and the grinding thickness.

[0011] Optionally, the system further includes: The judgment module is used to determine whether the target object is complete; The second acquisition module is used to acquire the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth by scanning the target object if the target object structure is complete. The third acquisition module is used to reconstruct the missing tissue through a model and scan the target object if the target object structure is missing, so as to obtain the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth.

[0012] Optionally, the first acquisition module is further configured to: The abrasion thickness of the target object is determined based on the thickness of the target repair body and the preset standard thickness.

[0013] Optionally, the measurement module includes: The measurement submodule is used to perform multi-angle ranging on the external morphology of the target restoration body through the ranging lenses set at different angles in the depth-fixing device, and obtain the measurement value corresponding to each angle; The comparison submodule is used to compare the measured value at each angle with the preset length of the needle, and determine the measured distance between the needle and the drilling point of the target object when the depth-fixing device is at different tilt angles.

[0014] The beneficial effects of this invention are as follows: This invention constructs a target restoration based on the ontological information of the target object, confirms the grinding thickness based on the target restoration, and measures the target restoration from multiple angles to obtain the measured distance between the bur and the drilling point of the target object at different angles. Finally, the fixed depth distance is calculated by combining the grinding thickness and the measured distance. This allows for a more scientific and accurate calculation of the fixed depth distance. Based on the accurate fixed depth distance, the precision of tooth processing can be improved, and the safety of the operation can be enhanced.

[0015] The above description of the invention is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0016] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0017] Figure 1 A flowchart illustrating a method for determining the depth of teeth according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a tooth depth-determining system provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only one preferred embodiment of this invention and are only used to explain this invention. They do not limit the scope of protection of this invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations (or steps) can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the figures; the process may correspond to a method, function, procedure, subroutine, subroutine, etc.

[0020] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. It should also be understood that in the various embodiments of the invention, the sequence number of each process does not imply a specific order of execution; the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the invention.

[0021] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a variable relationship describing the related objects, indicating that three relationships can exist. For example, "and / or B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "Contains A, B, and C", "Contains A, B, and C" means that all three A, B, and C are contained; "Contains A, B, or C" means that one of A, B, and C is contained; "Contains A, B, and / or C" means that any one, two, or three of A, B, and C are contained.

[0022] It should be understood that in this invention, "B corresponding to A", "B corresponding to A", "A and B correspond", or "B and A correspond" means that B is associated with A, and B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. Matching A and B is defined as a similarity between A and B that is greater than or equal to a preset threshold.

[0023] Example 1 like Figure 1 As shown, Figure 1 A flowchart illustrating a method for determining the depth of a tooth according to an embodiment of the present invention. The method includes the following steps: S101. Construct the target repair body based on the ontology information of the target object.

[0024] S102. Determine the abrasion thickness of the target object based on the target repair body.

[0025] S103. Measure the target restoration from multiple angles to obtain the measured distance between the burr of the depth-fixing tool and the drilling point of the target object at each angle.

[0026] S104. Determine the fixed depth distance at which the needle enters the target object based on the measured distance and the grinding thickness.

[0027] The target object can refer to the tooth itself that needs to be processed in the oral cavity. The ontological information can refer to the specific data of the tooth itself, including but not limited to the external morphology of the tooth, the thickness of the tooth soft tissue, the integrity of the tooth, and at least one target tooth that needs to be defined in depth. The external morphology of the tooth can include the curvature, shape, and integrity of the tooth as a whole in the oral cavity.

[0028] Specifically, after acquiring the ontology information, it can be synchronized in real time or indirectly input into the modeling system via a storage device. Finally, the ontology information can be stored for later retrieval. The system can perform virtual reconstruction based on data such as the tooth's shape, soft tissue thickness, and integrity, ultimately obtaining the target restoration, which is the dental restoration for the dental technician.

[0029] More specifically, by examining the reconstructed target restoration, the required reduction thickness of the tooth can be determined. This reduction thickness can be based on the degree of tooth defect or aesthetic enhancement; for example, a tooth defect depth of 0.02mm corresponds to a reduction thickness of 0.02mm. The reduction thickness can be determined based on the tooth thickness of the target restoration and a preset standard thickness. The standard thickness corresponds to the actual tooth thickness; different actual tooth thicknesses require different standard thicknesses. For example, a tooth thickness of 1.50cm, falling between 1.20cm and 1.50cm, corresponds to a standard thickness of 1.30cm.

[0030] More specifically, the aforementioned depth-determining device includes a high-speed handpiece head, multiple ranging lenses at different angles mounted on the high-speed handpiece head, and a bur held in the handpiece head. The ranging lenses can acquire distance using laser ranging. The drilling point of the target object can refer to the contact point corresponding to the tooth to be processed. Considering that the tooth shape is not a smooth plane, the high-speed handpiece head equipped with multiple ranging lenses at different angles can illuminate the tooth shape on the target restoration at different angles, and the distance between the bur and the tooth's drilling point can be measured based on the ranging lenses. The tooth to be processed can be one or more teeth.

[0031] More specifically, the aforementioned fixed depth distance refers to the maximum depth to which the bur penetrates the tooth to be processed, including the distance between the bur and the entry point of the tooth, as well as the thickness of the tooth to be removed. Therefore, the fixed depth distance for the bur to penetrate the tooth can be calculated by summing the required thickness of the tooth to be processed and the measured distance between the bur and the entry point of the tooth. Finally, tooth processing can be performed based on this fixed depth distance.

[0032] In this embodiment of the invention, a target restoration is constructed based on the ontological information of the target object. The grinding thickness is confirmed based on the target restoration, and the target restoration is measured from multiple angles to obtain the precise measurement distance between the bur and the drilling point of the target object at different angles. Finally, the fixed depth distance is calculated by combining the grinding thickness and the measurement distance. This allows for a more scientific and accurate calculation of the fixed depth distance. Based on the accurate fixed depth distance, the precision of tooth processing can be improved, and the safety of the operation can be enhanced.

[0033] Optionally, the body information includes soft tissue thickness information of the tooth, tooth body thickness information, and tooth external morphology, and before step S101 above, it includes: Determine whether the target object is complete; If the target object has a complete structure, the soft tissue thickness information, tooth body thickness information, and tooth external morphology of the tooth are obtained by scanning the target object. If the target object structure is missing, the missing tissue is reconstructed using a model and the target object is scanned to obtain information on the soft tissue thickness, tooth body thickness, and tooth external morphology.

[0034] Specifically, before modeling, it's possible to pre-check whether the teeth in the oral cavity have a complete structure. When a complete structure is present, the teeth can be scanned using cone-beam CT (CBCT), including scanning the tooth itself, the soft tissue surrounding the tooth, and the overall external morphology of the tooth. This allows for the acquisition of soft tissue thickness information, tooth thickness information, and tooth external morphology for constructing the target restoration. For teeth lacking a complete structure, such as those that are entirely or partially missing, a 3D virtual reconstruction of the missing portion can be performed first. Then, combined with a scan of the target object, information on soft tissue thickness, tooth thickness, and tooth external morphology is obtained for constructing the target restoration. In this embodiment, by determining the completeness of the target object before constructing the restoration, more comprehensive ontological information for building the restoration can be obtained, resulting in a model that more closely resembles teeth in a real oral cavity.

[0035] Optionally, step S103 above includes: The external morphology of the target repair body is measured from multiple angles by the ranging lenses set at different angles in the depth-fixing device, and the measurement value corresponding to each angle is obtained. The measured value at each angle is compared with the preset length of the needle to determine the measured distance between the needle and the drilling point of the target object at different tilt angles.

[0036] Specifically, each measuring lens has a different angle and position relative to the target object in the repair body. Therefore, different measurement values ​​can be obtained when measuring with measuring lenses at different angles. The preset distance length of the bur can be the major axis or radius of the bur. The measurement value obtained at each angle can be compared with the major axis or radius of the bur, and the comparison result can be used as the measurement distance between the bur and the drilling point of the target object at the corresponding angle. Based on the difference between the full length of the bur and the measurement distance, the fixed depth of the bur entering the target object can be obtained. Among them, different models of burs have different lengths, and the fixed depth should be equal to the thickness removed. In this embodiment, by obtaining the measurement distance between the bur and the drilling point of the target object at different angles, it is beneficial to accurately calculate the depth to which the bur should enter the target object in combination with the length of the bur.

[0037] Optionally, after step S104, the method further includes: After the needle enters the target object, the distance is measured in real time by the ranging lens and compared with the fixed depth distance to determine whether the needle has reached the fixed depth distance.

[0038] Specifically, after determining the fixed depth distance, during the tooth processing, the high-speed handpiece head holds the bur and tilts it into the tooth at different angles. The ranging lens on the high-speed handpiece head measures the distance in real time and compares it with the calculated fixed depth distance. When it is determined that the depth of the bur into the tooth has reached the fixed depth distance, a control command is issued through the system's built-in dedicated control module to control the motor of the high-speed handpiece to stop rotating, ensuring that the fixed depth of the bur is exactly the fixed depth distance, which is convenient for the next step of tooth grinding.

[0039] Example 2 like Figure 2 As shown, Figure 2 A schematic diagram of a tooth depth determination system proposed in accordance with a tooth depth determination method, wherein the system 20 includes: Module 201 is used to construct the target repair body based on the ontology information of the target object; The first acquisition module 202 is used to determine the abrasion thickness of the target object based on the target repair body; Measurement module 203 is used to measure the target restoration from multiple angles and obtain the measurement distance between the bur of the depth-fixing tool and the drilling point of the target object at each angle. The depth-determining module 204 is used to determine the depth at which the needle enters the target object based on the measured distance and the grinding thickness.

[0040] Optionally, the system 20 further includes: The judgment module 205 is used to determine whether the target object is complete; The second acquisition module 206 is used to acquire the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth by scanning the target object if the target object structure is complete. The third acquisition module 207 is used to reconstruct the missing tissue through a model and scan the target object if the target object structure is missing, so as to obtain the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth.

[0041] Optionally, the first acquisition module 202 is further configured to: determine the abrasion thickness of the target object based on the thickness of the target repair body and a preset standard thickness.

[0042] Optionally, the measurement module 203 includes: The measurement submodule 2031 is used to perform multi-angle ranging on the external morphology of the target repair body through the ranging lenses set at different angles in the depth-fixing device, and obtain the measurement value corresponding to each angle; The comparison submodule 2032 is used to compare the measured value at each angle with the preset length of the needle, and determine the measured distance between the needle and the drilling point of the target object when the depth-fixing device is at different tilt angles.

[0043] Optionally, the depth determination module 204 is specifically used to: determine the total distance the bur penetrates into the target object based on the measured distance between the bur and the drilling point of the target object and the grinding thickness of the target object, wherein the total distance is the depth determination distance.

[0044] Optionally, system 20 also includes: The comparison module 205 is used to measure the distance in real time through the ranging lens after the needle enters the target object and compare it with the fixed depth distance to determine whether the needle has reached the fixed depth distance.

[0045] The tooth depth determination system provided in this embodiment of the invention can realize all the processes implemented by the tooth depth determination method in the above-described method embodiments, and can achieve the same beneficial effects. To avoid repetition, it will not be described again here.

[0046] The specific embodiments described above are preferred embodiments of a tooth depth determination method of the present invention, and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. A method of depth finding of a tooth, characterized in that, Includes the following steps: Construct the target repair body based on the ontology information of the target object; The abrasion thickness of the target object is determined based on the target restoration. The target restoration is measured from multiple angles to obtain the measured distance between the bur of the depth-fixing tool and the drilling point of the target object at each angle. The depth at which the needle enters the target object is determined based on the measured distance and the grinding thickness. The depth-fixing device also includes multiple range-measuring lenses set at different angles. These multi-angle measurements of the target restoration body acquire the distance between the bur of the depth-fixing device and the drilling point of the target object at each angle, including: The external morphology of the target repair body is measured from multiple angles by the ranging lenses set at different angles in the depth-fixing device, and the measurement value corresponding to each angle is obtained. The measured value at each angle is compared with the preset length of the needle to determine the measured distance between the needle and the drilling point of the target object at different tilt angles. Determining the depth at which the depth-fixing tool enters the target object based on the measured distance and the grinding thickness includes: Based on the measured distance between the bur and the drilling point of the target object and the grinding thickness of the target object, the total distance the bur penetrates into the target object based on the drilling point is determined, and the total distance is the fixed depth distance; After determining the total distance the bur penetrates into the target object based on the measured distance between the bur and the drilling point of the target object and the grinding thickness of the target object, the method further includes: After the needle enters the target object, the distance is measured in real time by the ranging lens and compared with the fixed depth distance to determine whether the needle has reached the fixed depth distance.

2. A method of depth finding of a tooth as claimed in claim 1, wherein, The ontological information includes soft tissue thickness information of the tooth, tooth body thickness information, and tooth external morphology. Before constructing the target restoration based on the ontological information of the target object, the method further includes: Determine whether the target object is complete; If the target object has a complete structure, the soft tissue thickness information, tooth body thickness information, and tooth external morphology of the tooth are obtained by scanning the target object. If the target object structure is missing, the missing tissue is reconstructed using a model and the target object is scanned to obtain information on the soft tissue thickness, tooth body thickness, and tooth external morphology.

3. A method of depth finding of a tooth as claimed in claim 1, wherein, Determining the abrasion thickness of the target object based on the target restoration includes: The abrasion thickness of the target object is determined based on the thickness of the target repair body and the preset standard thickness.

4. A tooth depth finding system characterized by, The system includes: The building module is used to construct the target repair body based on the ontology information of the target object; The first acquisition module is used to determine the abrasion thickness of the target object based on the target repair body; The measurement module is used to measure the target restoration from multiple angles and obtain the measured distance between the bur of the depth-fixing tool and the drilling point of the target object at each angle. The depth-fixing device also includes multiple ranging lenses set at different angles, and the measurement module includes: The measurement submodule is used to perform multi-angle ranging on the external morphology of the target restoration body through the ranging lenses set at different angles in the depth-fixing device, and obtain the measurement value corresponding to each angle; The comparison submodule is used to compare the measured value at each angle with the preset length of the needle, and determine the measured distance between the needle and the drilling point of the target object when the depth-fixing device is at different tilt angles; The depth-determining module is used to determine the depth at which the bur enters the target object based on the measured distance and the grinding thickness. The comparison module is used to measure the distance in real time through the ranging lens after the needle enters the target object and compare it with the fixed depth distance to determine whether the needle has reached the fixed depth distance.

5. A depth-finding system for teeth according to claim 4, wherein The system also includes: The judgment module is used to determine whether the target object is complete; The second acquisition module is used to acquire the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth by scanning the target object if the target object structure is complete. The third acquisition module is used to reconstruct the missing tissue through a model and scan the target object if the target object structure is missing, so as to obtain the soft tissue thickness information, tooth body thickness information and tooth external morphology of the tooth.

6. A depth-finding system for teeth according to claim 4, wherein The first acquisition module is also used for: The abrasion thickness of the target object is determined based on the thickness of the target repair body and the preset standard thickness.

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