Root canal file fatigue life prediction method and device, electronic equipment and storage medium

Abstract

This invention relates to a method, device, electronic device, and storage medium for predicting the fatigue life of root canal files, and pertains to the field of root canal preparation technology. The method acquires the real-time torque of the root canal file to be predicted, configured on the root canal preparation machine, during the current treatment process, generating a torque timing signal. Based on the torque timing signal, the model of the root canal file to be predicted, and the rotational speed and motion mode information of the file during the current treatment process, the accumulated fatigue life consumption value of the file is obtained. The total fatigue life value of the file to be predicted is updated using this fatigue life consumption value, resulting in the latest total fatigue life value. This provides objective, parameterized, and traceable full-cycle life management of the root canal file's actual service status, overcoming defects such as missed or incorrect recording, neglecting individual root canal anatomy differences, and inability to reflect abnormal high-load conditions, thus improving instrument safety, operational standardization, and clinical traceability.

Description

Technical Field

[0001] This invention relates to the field of root canal preparation technology, and more specifically, to a method, apparatus, electronic device, and storage medium for predicting the fatigue life of root canal files. Background Technology

[0002] Root canal treatment is a crucial procedure in endodontics, and one of its core steps is the mechanical preparation of the root canal walls using root canal files to remove infected tissue and create a shape conducive to filling. Root canal files are typically made of stainless steel or nickel-titanium alloy, possessing good flexibility and cutting ability. However, under repeated torsional and bending stresses, they are prone to metal fatigue, leading to instrument breakage. Once a breakage occurs within the root canal, it not only interrupts the treatment process but may also trigger periapical inflammation, necessitate surgical removal, or even tooth extraction, significantly impacting patient complications and medical safety.

[0003] Currently, the management of the lifespan of root canal files in clinical practice mainly relies on the following two methods: The first type is based on empirically determined fixed usage counts, which means that according to the manufacturer's instructions or operating specifications, a certain type of root canal file is specified as the maximum number of times it can be used in the preparation of a single tooth root canal, or a single file is limited to being used on no more than N teeth in total. This method is simple to implement, but it does not take into account the differences in actual operating conditions. For example, the damage to the material caused by continuous high-torque cutting in a calcified root canal is not the same as that caused by gentle exploration in a patent root canal.

[0004] The second category is the visual and tactile judgment method, in which the operator judges whether the instrument needs to be replaced by observing subjective signs such as scratches on the surface of the file, changes in gloss, decreased elasticity, or abnormal rotational resistance. This method is highly dependent on the physician's experience. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method, apparatus, electronic device and storage medium for predicting the fatigue life of root canal files.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, the present invention provides a method for predicting the fatigue life of a root canal file, the method comprising: The real-time torque of the root canal file to be predicted, configured on the root canal preparation machine, is obtained during the current treatment process, and a torque timing signal is generated. Based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, the fatigue life consumption value accumulated by the root canal file to be predicted during the current treatment process is obtained. The total fatigue life value of the root canal file to be predicted is updated using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted.

[0007] Optionally, the step of obtaining the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process includes: The torque time-series signal is sampled according to a preset period to obtain the torque-time discrete sequence. Based on the model of the root canal file to be predicted and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, the fatigue life value calculation formula corresponding to the root canal file to be predicted is determined, and the torque-time discrete sequence is processed using the fatigue life value calculation formula to obtain a single-point fatigue life consumption ratio sequence. The fatigue life consumption value is obtained based on the single-point fatigue life consumption ratio sequence.

[0008] Optionally, the step of processing the torque-time discrete sequence using the fatigue life calculation formula corresponding to the model of the root canal file to be predicted to obtain the single-point fatigue life consumption ratio sequence includes: For each sampling point in the torque-time discrete sequence, the theoretical duration of the root canal file to be predicted corresponding to the sampling point is obtained by using the real-time torque of the root canal file to be predicted corresponding to the sampling point and the fatigue life value calculation formula. The ratio of the preset period to the theoretical duration is used as the single-point fatigue life consumption ratio corresponding to the sampling point. By traversing all sampling points in the torque-time discrete sequence, the single-point fatigue life consumption ratio sequence is obtained.

[0009] Optionally, the step of obtaining the fatigue life consumption value based on the single-point fatigue life consumption ratio sequence includes: The fatigue life consumption ratios corresponding to all sampling points in the single-point fatigue life consumption ratio sequence are summed to obtain the fatigue life consumption value.

[0010] Optionally, the step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: The sum of the fatigue life consumption value and the total fatigue life value is taken as the latest total fatigue life value.

[0011] Optionally, the step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: If the fatigue life consumption value is not greater than the preset value, then the sum of the preset value and the total fatigue life value is taken as the latest total fatigue life value.

[0012] Optionally, the step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: If the fatigue life consumption value is not greater than the preset value, then it is determined whether the number of times the root canal file to be predicted has been used has reached the preset number of times. If so, the product of the total fatigue life value of the root canal file to be predicted and the first preset multiplier coefficient is taken as the latest total fatigue life value. If not, the product of the total fatigue life value of the root canal file to be predicted and the second preset multiplier coefficient is taken as the latest total fatigue life value; the first preset multiplier coefficient is greater than the second preset multiplier coefficient.

[0013] Secondly, the present invention provides a root canal file fatigue life prediction device, the device comprising: The acquisition module is used to acquire the real-time torque of the root canal file to be predicted configured on the root canal preparation machine during the current treatment process and generate a torque timing signal. The prediction module is used to obtain the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process; and to update the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted.

[0014] Thirdly, the present invention provides an electronic device including a processor and a memory, the memory storing machine-executable instructions executable by the processor, the processor executing the machine-executable instructions to implement the root canal file fatigue life prediction method described in the first aspect above.

[0015] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the root canal file fatigue life prediction method as described in the first aspect above.

[0016] The root canal file fatigue life prediction method, device, electronic device, and storage medium provided in this invention acquire the real-time torque of the root canal file to be predicted configured on the root canal preparation machine during the current treatment process, generating a torque timing signal; based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process is obtained; the fatigue life consumption value is used to update the total fatigue life value of the root canal file to be predicted, obtaining the latest total fatigue life value of the root canal file to be predicted. Because this invention acquires the torque timing signal borne by the root canal file during the root canal preparation process in real time, and dynamically quantifies the microscopic fatigue damage caused by a single treatment and updates the total fatigue life value in combination with its model, it achieves objective, parameterized, and traceable full-cycle life management of the actual service status of the root canal file. Compared with the traditional method relying on manual counting and subjective experience judgment, it fundamentally overcomes the defects of missed or incorrect recording, ignoring individual root canal anatomy differences, and failing to reflect abnormal high-load conditions, improving the safety, standardization, and clinical traceability of instrument use.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This figure shows a schematic block diagram of an electronic device provided by an embodiment of the present invention; Figure 2 A flowchart illustrating a method for predicting the fatigue life of a root canal file according to an embodiment of the present invention is shown. Figure 3 This invention provides a scatter plot of fatigue test data for a root canal file according to an embodiment of the invention. Figure 4 The diagram shows a functional block diagram of a root canal file fatigue life prediction device provided in an embodiment of the present invention.

[0020] Icons: 100 - Electronic device; 110 - Memory; 120 - Processor; 130 - Communication module; 200 - Root canal file fatigue life prediction device; 201 - Acquisition module; 202 - Prediction module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] In current dental clinical practice, machine-made root canal files are the core consumables for root canal preparation, and their safe use highly depends on the accurate assessment of fatigue damage. However, the current mainstream management methods still heavily rely on empirical and discrete manual judgment, lacking a quantitative lifespan prediction mechanism based on mechanical measurements and mathematical modeling. This manifests in the following three types of systemic defects: (1) Clinically, the “counting method” is commonly used to count the number of times a root canal file is used (i.e., each operation before the completion of a sterilization cycle is counted as 1 operation). However, this method completely ignores the actual load difference: for the same type A nickel-titanium root canal file, the average torque of a single cut in a straight root canal is about 0.8 N·cm, and the duration is about 12 seconds; while in a severely curved (curvature angle > 30°) calcified root canal, the peak torque under the same operation can reach 2.6 N·cm, and the cumulative high load time is extended to 47 seconds. The degree of fatigue damage between the two is more than 3 times different.

[0025] 2. Existing technology only suggests "observing blade deformation, thread wear, or abnormal operating resistance," but the initiation of microcracks (usually starting in the stress concentration area of ​​the root canal file handle) is not visible to the naked eye or under a conventional microscope, and the doctor's tactile feedback is significantly affected by operating experience and hand fatigue.

[0026] 3. Existing life prediction models are mostly based on static bending fatigue tests at constant bending angles, failing to couple with real-world dynamic rotational-reciprocating torsional loads. Furthermore, they simplify material properties (such as phase transition temperature and hyperelastic plateau width) to fixed parameters, neglecting batch-to-batch performance variations caused by heat treatment process fluctuations. Such models exhibit large prediction errors in complex anatomical root canals (such as S-shaped double bends and internal absorption cavities), failing to meet clinical safety redundancy requirements.

[0027] The aforementioned drawbacks collectively lead to excessively conservative and wasteful practices in clinical practice to avoid risks, thus increasing treatment costs. In response, this invention provides a method, device, electronic device, and storage medium for predicting the fatigue life of root canal files, which will be described in detail below.

[0028] Please refer to Figure 1 This is a block diagram of an electronic device 100. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0029] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0030] The processor 120 is used to read / write data or programs stored in the memory 110 and to perform corresponding functions.

[0031] The communication module 130 is used to establish a communication connection between the electronic device 100 and other communication terminals through the network, and to send and receive data through the network.

[0032] It should be understood that, Figure 1 The structure shown is only a schematic diagram of the electronic device 100. The electronic device 100 may also include components that are larger than... Figure 1The more or fewer components shown, or having the same Figure 1 The different configurations shown. Figure 1 The components shown can be implemented using hardware, software, or a combination thereof.

[0033] Please refer to Figure 2 The method for predicting the fatigue life of root canal files includes steps S101 to S103.

[0034] S101: Obtain the real-time torque of the root canal file to be predicted configured by the root canal preparation machine during the current treatment process, and generate a torque timing signal.

[0035] Before the root canal preparation surgery begins, the target model of root canal file is installed on the root canal preparation machine with torque sensing function through the standard clamping interface; the root canal preparation machine has a built-in synchronous sampling module.

[0036] After the device is started, the synchronous sampling module continuously collects the motor current of the root canal preparation machine at a preset sampling frequency (e.g., 100Hz), and calculates the instantaneous torque signal borne by the spindle of the root canal file based on the motor current. The instantaneous torque signal is converted from analog to digital to generate a digital torque sequence with timestamp alignment. This sequence constitutes a complete torque timing signal, which fully records the dynamic load history of the root canal file during this treatment, from entering the root canal, cutting calcified tissue, encountering bending resistance, triggering the reverse protection, to exiting the root canal.

[0037] S102, based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, obtains the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process.

[0038] In a possible implementation, the process of step S102 may include: S102-1, sample the torque time sequence signal according to a preset period to obtain a torque-time discrete sequence.

[0039] Set the sampling period Ts=100ms (i.e., every 10 original sampling points are merged into 1 analysis unit), perform sliding window statistics on the torque time series signal, take the maximum value of the absolute torque within each window as the representative value of that period, and generate a discrete sequence.

[0040] Taking the maximum absolute value of torque within each window as the representative value of that cycle instead of the mean value is because fatigue failure is dominated by local stress concentration, which is consistent with the Miner linear cumulative damage theory of high-cycle fatigue of metallic materials.

[0041] S102-2, based on the model of the root canal file to be predicted and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, determine the fatigue life value calculation formula corresponding to the root canal file to be predicted, and use the fatigue life value calculation formula to process the torque-time discrete sequence to obtain the single-point fatigue life consumption ratio sequence.

[0042] The motion mode information includes at least one of the following three motion modes: continuous forward rotation (clockwise), continuous reverse rotation (counterclockwise), and reciprocating motion (e.g., 150° reverse rotation and 30° forward rotation in a cycle).

[0043] For the target model of root canal file, its torque-life mapping relationship can be obtained in advance through the following standardized fatigue test.

[0044] In a simulated real-world environment, multiple root canal files of the same target model were subjected to constant torque at the same constant speed and motion mode, and the duration of macroscopic fracture was recorded to form an experimental dataset. By changing the speed and / or motion mode, a new set of standardized fatigue tests was conducted to obtain a new experimental dataset. Understandably, different experimental datasets correspond to different speeds.

[0045] For example, 100 root canal files of the same target model were subjected to constant torque (e.g., 0.5, 1.0, 1.5, ..., 5.0 N·cm) at the same constant speed A and motion mode a, and the duration of macroscopic fracture was recorded to form experimental dataset 1; 100 root canal files of the same target model were subjected to constant torque (e.g., 0.5, 1.0, 1.5, ..., 5.0 N·cm) at the same constant speed B and motion mode a, and the duration of macroscopic fracture was recorded to form experimental dataset 2; ...; 100 root canal files of the same target model were subjected to constant torque (e.g., 0.5, 1.0, 1.5, ..., 5.0 N·cm) at the same constant speed A and motion mode b, and the duration of macroscopic fracture was recorded to form experimental dataset n; For each experimental dataset, a scatter plot was created with the real-time torque experienced by the root canal file in that dataset as the x-axis and the continuous use time of the root canal file as the y-axis. The fatigue life value of the root canal file was calculated using curve fitting on large datasets.

[0046] in, This represents the fatigue life value. It is a constant. This refers to the torque applied to the root canal file in real time. It is a constant. This refers to the real-time rotation speed of the root canal file. This is a constant related to the physical properties of the root canal file itself (affected by the manufacturing process such as the material and heat treatment of the root canal file). The physical property reference value for the defined root canal file itself (the actual value, compared with...) (Mutual matching) These are the structural dimension constants of the root canal file (such as diameter, taper, and structural shape parameters). The defined reference values ​​for the structural dimensions of the root canal file (actual values, compared with...) (Mutual matching).

[0047] Since the real-time rotational speed remains constant throughout the entire usage process, the second term in the above fatigue life calculation formula is a fixed value or a finite value, and the influence of this calculation can be omitted from the formula.

[0048] Once a specific root canal file is selected, the physical properties of the file itself are fixed, meaning that the third item in the formula can be omitted from the calculation.

[0049] Once a specific root canal file is selected, its structural dimensions are fixed, meaning that the fourth item in the formula can be omitted from the calculation.

[0050] The simplified formula for calculating the fatigue life of root canal files is as follows:

[0051] For example, a scatter plot is drawn with the real-time torque applied to the root canal file as the x-axis and the duration of continuous use of the root canal file as the y-axis, as shown in the figure. Figure 3 As shown.

[0052] based on Figure 3 The fatigue life value of the root canal file is calculated by curve fitting of the scatter plot shown below:

[0053] It is worth noting that fatigue life is strongly nonlinearly negatively correlated with torque. The fatigue life decays slowly in the low torque region (<1.5 N·cm) and drops sharply in the high torque region (>2.5 N·cm). This is in complete agreement with the phase transformation behavior and microcrack propagation kinetics of nickel-titanium alloys.

[0054] Understandably, different experimental datasets yield different fatigue life calculation formulas, meaning that the fatigue life calculation formulas for the target model root canal file are different under different speeds and motion modes.

[0055] For different types of root canal files, the aforementioned standardized fatigue test must be carried out independently to obtain the corresponding fitting formula.

[0056] When the fatigue curve of a certain type of root canal file at a certain speed exhibits obvious two-stage characteristics (such as slow decay in the low torque region and steep fracture in the high torque region), a piecewise fitting strategy can be adopted. For example, with 2.0 N·cm as the boundary, two polynomials can be fitted separately, and then a weighted transition function can be used to smoothly connect them to ensure that the calculation is continuous and differentiable in the entire torque domain.

[0057] In this embodiment of the invention, if the rotation speed information of the root canal file to be predicted during the current treatment process is that the rotation speed of the root canal file to be predicted during the current treatment process is constant at V1 and the motion mode is constant at mode a, then from the multiple pre-fitted fatigue life value calculation formulas corresponding to the model of the root canal file to be predicted, the fatigue life value calculation formula corresponding to the test conditions V1 and a is determined as the target formula for subsequent calculation.

[0058] If the rotation speed information of the root canal file to be predicted during the current treatment process is V1 during the t0~t1 period, V2 during the t1~t2 period, and V3 during the t2~t3 period, and the motion mode is constant as mode a, then from the multiple pre-fitted fatigue life value calculation formulas corresponding to the model of the root canal file to be predicted, the fatigue life value calculation formulas corresponding to the test conditions V1 and a, V2 and a, and V3 and a are all determined as target formulas for subsequent calculations.

[0059] If the rotational speed information of the root canal file to be predicted during the current treatment process is that the rotational speed of the root canal file to be predicted during the current treatment process is constant at V1, and the movement pattern is mode a during the t0~t1 period, mode b during the t1~t2 period, and mode c during the t2~t3 period, then from the multiple fatigue life value calculation formulas pre-fitted according to the model of the root canal file to be predicted, the fatigue life value calculation formulas corresponding to the test conditions V1 and a, test conditions V1 and b, and test conditions V1 and c are all determined as target formulas for subsequent calculations.

[0060] If the rotation speed information of the root canal file to be predicted during the current treatment process is V1 during the t0~t1 period, V2 during the t1~t2 period, and V3 during the t2~t3 period, and the movement pattern is mode a during the t0~t2 period and mode b during the t2~t3 period, then from the multiple pre-fitted fatigue life value calculation formulas corresponding to the model of the root canal file to be predicted, the fatigue life value calculation formulas corresponding to test conditions V1 and a, test conditions V2 and a, and test conditions V3 and b are all determined as target formulas for subsequent calculations.

[0061] In this embodiment of the invention, for each sampling point in the torque-time discrete sequence, the theoretical duration of the root canal file to be predicted corresponding to the sampling point can be obtained by using the calculation formula of the real-time torque and fatigue life value of the root canal file to be predicted corresponding to the sampling point; the ratio of the preset period to the theoretical duration is used as the single-point fatigue life consumption ratio corresponding to the sampling point; and all sampling points in the torque-time discrete sequence are traversed to obtain the single-point fatigue life consumption ratio sequence.

[0062] In this embodiment of the invention, if the rotational speed and motion pattern of the root canal file to be predicted are constant during the current treatment process, then for any sampling point in the discrete sequence, the real-time torque of the root canal file to be predicted corresponding to that sampling point is substituted into the pre-obtained fatigue life calculation formula corresponding to the constant rotational speed and constant motion pattern to calculate its theoretical life, and the ratio of its theoretical life to a preset cycle is used as the single-point fatigue life consumption ratio corresponding to that point. This process is repeated for all sampling points to generate a single-point fatigue life consumption ratio sequence.

[0063] If the rotation speed of the root canal file to be predicted is not constant but the motion pattern is constant during the current treatment process, then for any sampling point in the discrete sequence, the real-time torque of the root canal file to be predicted corresponding to that sampling point is substituted into the fatigue life calculation formula corresponding to the constant motion pattern and the rotation speed of the time period in which the sampling point is located, to calculate its theoretical life, and the ratio of its theoretical life to the preset cycle is used as the single-point fatigue life consumption ratio corresponding to that point. This process is repeated for all sampling points to generate a single-point fatigue life consumption ratio sequence.

[0064] If the rotational speed of the root canal file to be predicted is constant but the motion pattern is not constant during the current treatment process, then for any sampling point in the discrete sequence, the real-time torque of the root canal file to be predicted corresponding to that sampling point is substituted into the fatigue life calculation formula corresponding to the constant rotational speed and the motion pattern of the time period in which the sampling point is located, to calculate its theoretical life, and the ratio of its theoretical life to the preset cycle is used as the single-point fatigue life consumption ratio corresponding to that point. This process is repeated for all sampling points to generate a single-point fatigue life consumption ratio sequence.

[0065] If the rotation speed and motion pattern of the root canal file to be predicted are not constant during the current treatment process, then for any sampling point in the discrete sequence, the real-time torque of the root canal file to be predicted corresponding to that sampling point is substituted into the fatigue life calculation formula corresponding to the rotation speed and motion pattern of the time period in which the sampling point is located, and its theoretical life is calculated. The ratio of its theoretical life to the preset cycle is used as the single-point fatigue life consumption ratio corresponding to that point. Traversing all sampling points, a single-point fatigue life consumption ratio sequence is generated.

[0066] S102-3, based on the single-point fatigue life consumption ratio sequence, obtain the fatigue life consumption value.

[0067] In this embodiment of the invention, the fatigue life consumption ratios corresponding to all sampling points in the single-point fatigue life consumption ratio sequence can be accumulated to obtain the fatigue life consumption value.

[0068] S103, update the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value, and obtain the latest total fatigue life value of the root canal file to be predicted.

[0069] In one possible implementation, the sum of the fatigue life consumption value and the total fatigue life value can be used as the latest total fatigue life value.

[0070] Understandably, the fatigue life value obtained from this treatment is directly added to the historical total fatigue life value to obtain the latest total fatigue life value. This method is based on Miner's linear cumulative damage theory, which assumes that the damage caused to the material by each load event is independent and additive. It is applicable to scenarios where the root canal file is in the early service stage, the root canal anatomy is relatively simple (curvature <25°, calcification grade ≤II), and there are no abnormal high-torque impact events. At this time, the material microstructure is stable, there is no significant phase transformation hysteresis or residual stress accumulation, and linear superposition has sufficient physical basis.

[0071] In another possible implementation, if the fatigue life consumption value is not greater than the preset value, then the sum of the preset value and the total fatigue life value is taken as the latest total fatigue life value.

[0072] The preset value can be the minimum fatigue life of the root canal file for each use.

[0073] Understandably, when the calculated fatigue life consumption value is less than the preset value, the calculated fatigue life consumption value is not used, and the current update amount is forced to be the preset value. This method is based on clinical evidence that short-term operations under extremely low load (such as coronal root canal shaping and light exploration) can still induce micro-cracks in the oxide film on the surface of nickel-titanium alloy and dislocation initiation. Although such damage is weak in a single instance, it is irreversible and has memory. Setting the "minimum fatigue life value for each use" is an engineered characterization of the lower limit of intrinsic material damage, ensuring that every clinical use is given the minimum life reduction, fundamentally eliminating the "zero-loss illusion".

[0074] In another possible implementation, if the fatigue life consumption value is not greater than a preset value, it is determined whether the number of times the root canal file to be predicted has been used has reached a preset number; if so, the product of the total fatigue life value of the root canal file to be predicted and the first preset multiplier coefficient is taken as the latest total fatigue life value; if not, the product of the total fatigue life value of the root canal file to be predicted and the second preset multiplier coefficient is taken as the latest total fatigue life value; the first preset multiplier coefficient is greater than the second preset multiplier coefficient.

[0075] For example, the preset number of times can be 12 times, the first preset multiplier can be 200%, and the second preset multiplier can be 110%.

[0076] Nickel-titanium alloy root canal files exhibit a clear "aging inflection point." Experiments show that after 12 standard sterilization cycles (134℃ autoclaving), the material undergoes triple degradation: (1) The residual stress from heat treatment is partially released, and the hyperelastic plateau region narrows; (2) Selective precipitation of Ni on the surface increases corrosion sensitivity; (3) The unevenness of the thickness of the micro-martensite lamellars is aggravated, and the phase transformation coordination ability is reduced.

[0077] At this point, even under the same torque, the actual crack propagation rate is 3–5 times higher than that of a new file. Therefore, once a device enters its aging period, a multiplier (e.g., 200%) can be applied to forcibly amplify all subsequent damage contributions, reflecting the material science principle of "old devices, new damage, and doubled costs." For devices that have not yet reached their aging period, only a moderate multiplier (e.g., 110%) is applied, which reflects the slight cumulative effect of early cyclic loading while avoiding excessive conservatism that leads to resource waste.

[0078] The three implementation methods of step S103 described above constitute a hierarchical, context-aware lifespan update strategy system. The basic method ensures universality, the threshold method strengthens the safety baseline, and the coefficient method directly addresses the core of material degradation. Together, these three methods ensure that the embodiments of the present invention can provide lifespan prediction results that highly match the actual state of the material throughout its entire lifespan (from initial use to scrapping), solving the fundamental deficiency of existing technologies that "relying solely on recording the number of uses cannot reflect the actual degree of fatigue."

[0079] Furthermore, the remaining life percentage is calculated using the latest total fatigue life value of the root canal file to be predicted, and an early warning is issued based on the remaining life percentage.

[0080] For example, when the remaining lifespan percentage is less than 15%, a red warning icon pops up on the device interface and a beep sounds; when the remaining lifespan percentage is less than 5%, the root canal file number is automatically locked, preventing it from being used again, and a message is displayed: "Please discard immediately".

[0081] To perform the corresponding steps in the above embodiments and various possible methods, an implementation of a root canal file fatigue life prediction device 200 is given below. Further, please refer to... Figure 4 , Figure 4This is a functional block diagram of a root canal file fatigue life prediction device 200 provided in an embodiment of the present invention. It should be noted that the root canal file fatigue life prediction device 200 provided in this embodiment has the same basic principle and technical effects as those in the above embodiments. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments. The root canal file fatigue life prediction device 200 includes: The acquisition module 201 is used to acquire the real-time torque of the root canal file to be predicted configured in the root canal preparation machine during the current treatment process and generate a torque timing signal. The prediction module 202 is used to obtain the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed information of the root canal file to be predicted during the current treatment process; and to update the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted.

[0082] Optionally, the above modules can be stored in the form of software or firmware. Figure 1 The memory 110 shown can be used by Figure 1 The processor 120 executes the program. Meanwhile, the data and program code required to execute the above modules can be stored in the memory 110.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0084] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0085] If the functionality is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, electronic device 100, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for predicting the fatigue life of a root canal file, characterized in that, The method includes: The real-time torque of the root canal file to be predicted, configured on the root canal preparation machine, is obtained during the current treatment process, and a torque timing signal is generated. Based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, the fatigue life consumption value accumulated by the root canal file to be predicted during the current treatment process is obtained. The total fatigue life value of the root canal file to be predicted is updated using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted.

2. The method for predicting the fatigue life of root canal files as described in claim 1, characterized in that, The step of obtaining the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process includes: The torque time-series signal is sampled according to a preset period to obtain the torque-time discrete sequence. Based on the model of the root canal file to be predicted and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process, the fatigue life value calculation formula corresponding to the root canal file to be predicted is determined, and the torque-time discrete sequence is processed using the fatigue life value calculation formula to obtain a single-point fatigue life consumption ratio sequence. The fatigue life consumption value is obtained based on the single-point fatigue life consumption ratio sequence.

3. The method for predicting the fatigue life of root canal files as described in claim 2, characterized in that, The step of processing the torque-time discrete sequence using the fatigue life calculation formula corresponding to the model of the root canal file to be predicted, and obtaining the single-point fatigue life consumption ratio sequence, includes: For each sampling point in the torque-time discrete sequence, the theoretical duration of the root canal file to be predicted corresponding to the sampling point is obtained by using the real-time torque of the root canal file to be predicted corresponding to the sampling point and the fatigue life value calculation formula. The ratio of the preset period to the theoretical duration is used as the single-point fatigue life consumption ratio corresponding to the sampling point. By traversing all sampling points in the torque-time discrete sequence, the single-point fatigue life consumption ratio sequence is obtained.

4. The method for predicting the fatigue life of root canal files as described in claim 3, characterized in that, The step of obtaining the fatigue life consumption value based on the single-point fatigue life consumption ratio sequence includes: The fatigue life consumption ratios corresponding to all sampling points in the single-point fatigue life consumption ratio sequence are summed to obtain the fatigue life consumption value.

5. The method for predicting the fatigue life of root canal files as described in claim 1, characterized in that, The step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: The sum of the fatigue life consumption value and the total fatigue life value is taken as the latest total fatigue life value.

6. The method for predicting the fatigue life of root canal files as described in claim 1, characterized in that, The step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: If the fatigue life consumption value is not greater than the preset value, then the sum of the preset value and the total fatigue life value is taken as the latest total fatigue life value.

7. The method for predicting the fatigue life of root canal files as described in claim 1, characterized in that, The step of updating the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted includes: If the fatigue life consumption value is not greater than the preset value, then it is determined whether the number of times the root canal file to be predicted has been used has reached the preset number of times. If so, the product of the total fatigue life value of the root canal file to be predicted and the first preset multiplier coefficient is taken as the latest total fatigue life value. If not, the product of the total fatigue life value of the root canal file to be predicted and the second preset multiplier coefficient is taken as the latest total fatigue life value; the first preset multiplier coefficient is greater than the second preset multiplier coefficient.

8. A device for predicting the fatigue life of a root canal file, characterized in that, The device includes: The acquisition module is used to acquire the real-time torque of the root canal file to be predicted configured on the root canal preparation machine during the current treatment process and generate a torque timing signal. The prediction module is used to obtain the accumulated fatigue life consumption value of the root canal file to be predicted during the current treatment process based on the torque timing signal, the model of the root canal file to be predicted, and the rotation speed and motion mode information of the root canal file to be predicted during the current treatment process; and to update the total fatigue life value of the root canal file to be predicted using the fatigue life consumption value to obtain the latest total fatigue life value of the root canal file to be predicted.

9. An electronic device, characterized in that, It includes a processor and a memory, the memory storing machine-executable instructions that can be executed by the processor to implement the root canal file fatigue life prediction method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the root canal file fatigue life prediction method as described in any one of claims 1-7.

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