Rotary dental material testing machine and testing complex

Abstract

FIELD: dentistry.SUBSTANCE: used for the study of dental materials. The rotary machine includes a brush holder connected to a motor, a movable platform with a holder for at least one test sample, and a frame. The frame includes lower, middle and upper transverse load-bearing elements, as well as load-bearing pins connecting the middle and lower transverse load-bearing elements, guide pins connecting the upper, middle and lower transverse load-bearing elements and support pins connecting the brush holder motor with the lower transverse load-bearing element. At least one carrier, at least one guide and at least one support pin are connected to a damping means having openings for the pins and located between the lower transverse carrier element and the brush holder. Elastic dampers are installed in the holes of the damping means. Another invention of the group relates to a testing complex for dental materials, comprising the said rotary machine and a means for supplying a fluid medium.EFFECT: increase in the accuracy of the results of testing dental materials, including by damping vibrations that occur on the cantilevered brush holder and motor, without significantly increasing the complexity of the design of the rotary machine.20 cl, 10 dwg

Description

[0001] Field of technology to which the invention relates

[0002] A group of inventions, including a rotary machine for testing dental materials and a test system containing it, relates to medicine, specifically dentistry, and can be used to study dental materials, including the effects of toothbrushes and toothpastes. In particular, the proposed test system can be used to determine the abrasiveness of toothpastes and their effect on composite materials simulating tooth enamel.

[0003] Technology Level

[0004] In the field of medical materials testing, testing devices designed to simulate various conditions, such as the impact of a toothbrush and toothpaste on tooth enamel, are widely used. Such solutions often simulate the processes that occur during toothbrushing in the human mouth. For this purpose, various devices can be used that reproduce the reciprocating action of a brush on the test material.

[0005] An example of such a device is a testing machine in which the test specimens and a drive mechanism simulating the reciprocating motion of toothbrushes are mounted on a platform. The drive mechanism includes a motor that rotates a crank, connected to a rod that transmits the reciprocating motion to elements containing bristles and simulating toothbrushes. These elements are placed on the platform opposite the test specimens, ensuring contact with them (CN 103364335 A, 23.10.2013).

[0006] This solution enables testing of dental materials, including toothpaste abrasiveness. However, it also has a drawback due to the mechanism used to reproduce the reciprocating motion of the brushes. This mechanism simulates the motion of a toothbrush in the oral cavity, as performed by humans. However, it is important to note that testing of dental materials can involve multiple test cycles performed in a single setup, both for the test specimen and the toothbrushes acting upon them. This is due to the need to simulate the prolonged impact of toothbrushes and toothpastes on tooth enamel. Therefore, during testing, not only the test specimens but also the mechanism itself, which converts rotary motion into reciprocating motion, are subjected to alternating loads.As a result, when conducting high-cycle tests, the drive mechanism itself can introduce errors into the test results. This is due, in particular, to some degree of grinding of the mechanism's components, which is often probabilistic in nature. In some cases, significant wear of these components can also occur, for example, due to uneven application of lubricants. Consequently, the failure pattern of the test specimen is subject to errors due to factors unrelated to the abrasive action of the toothpaste, and, consequently, the accuracy of such tests cannot be considered satisfactory.

[0007] The solution to this problem can be considered to be the abandonment of the intermediate transmission mechanism and the transition to rotational movement of the brushes relative to the holder of the test samples.

[0008] For example, a rotary machine for testing dental materials is known, comprising a brush holder connected to a motor, a movable specimen holder, a means for delivering a fluid to the area between the holders, and a supporting frame. The frame comprises three transverse supporting elements, as well as pins connecting them. The movable specimen holder is movable along the frame, and the middle transverse supporting element has an opening for accommodating the brush holder's motor (RU 2799136 C1, 04.07.2023).

[0009] This solution has a simple design and is free from the disadvantages associated with the presence of a mechanism for converting movement from a drive motor.

[0010] However, this rotary machine is not without its drawbacks. For example, during testing, it was discovered that alternating oscillations may occur during the rotation of the brush holder. This may be primarily due to the random distribution of the fluid simulating toothpaste during testing, as well as possible inaccuracies in the execution and placement of the rotary machine components during preparation for the experiment.

[0011] This problem is exacerbated by the fact that the motor and brush holder are mounted cantilevered relative to the lowest cross-supporting element. Therefore, the end section of the studs, where the motor and brush holder are located, is free to deviate from their vertical position. Consequently, significant alternating oscillations of the brush holder relative to the sample holder can occur, affecting the test results. Due to the aforementioned causes of oscillations, these oscillations are probabilistic in nature and difficult to predict.

[0012] Thus, there is a need in the prior art for a testing complex containing a rotary machine for testing dental materials in which the simplicity of the design is combined with a reduction in the influence of the design features of the rotary machine on the results of testing dental materials.

[0013] Disclosure of the essence of the invention

[0014] The technical result of the proposed group of inventions consists of eliminating the aforementioned deficiencies of the prior art. Specifically, the use of the inventions included in the proposed group improves the accuracy of dental material testing results, including by damping vibrations arising from the cantilevered brush holder and motor, without significantly increasing the complexity of the rotary machine design.

[0015] The technical result is achieved in a rotary machine for testing dental materials, which includes a brush holder for mounting at least one brush, rotatably connected to a motor. The rotary machine also includes a movable platform with a holder for at least one test sample, configured to accommodate a load, and a fluid supply means configured to supply a fluid to the area between the holder of at least one test sample and the brush holder. In addition, there is a frame including lower, middle, and upper transverse load-bearing elements, as well as load-bearing pins connecting the middle and lower transverse load-bearing elements, guide pins connecting the upper, middle, and lower transverse load-bearing elements, and support pins connecting the brush holder motor to the lower transverse load-bearing element.The movable platform is movable along the guide pins of the frame, and the middle transverse support element has an opening for accommodating the brush holder motor. At least one support pin, at least one guide pin, and at least one support pin are connected to a damping means having openings for at least one support pin, at least one guide pin, and at least one support pin and located between the lower transverse support element and the brush holder, wherein elastic dampers are installed in at least a portion of the openings of the damping means.

[0016] In the proposed invention, the rotor machine frame consists of a set of load-bearing structural elements. These include lower, middle, and upper cross-bearing elements. These cross-bearing elements provide stability and contribute to the structural integrity of the rotor machine frame. A series of studs of varying lengths and different functional purposes are used to connect them together.

[0017] Specifically, load-bearing pins are used to connect the middle and lower cross-bearing members. These load-bearing pins are used to increase the rigidity of the frame structure and, together with the middle and lower cross-bearing members, create a rigid base for the other components of the rotary machine. As a rule, load-bearing pins are made with a larger diameter than the other pins and are less susceptible to lateral vibration.

[0018] Guide pins are also used, connecting the upper, middle, and lower cross-bearing elements. These pins extend through the entire structure, providing additional reinforcement to the supporting pins and supporting the upper cross-bearing element. They also serve as guides for the movement of the movable platform, which supports a holder for at least one test specimen. The guide pins are subject to vibrations from the movement of the movable platform and the holder for at least one test specimen, which can move due to the forces exerted by the rotating brushes of the brush holder.

[0019] Furthermore, the rotor machine frame design uses support pins connecting the brush holder motor to the lower cross-support element. These pins act as supports for the motor and brush holder, keeping them in alignment with other structural elements of the rotor machine. The support pins absorb vibrations from the rotating motor and brush holder.

[0020] The rotor machine frame structure includes a damping means that connects at least one stud from each of the above-mentioned groups, each having a different design and function. Specifically, this damping means connects at least one load-bearing stud, at least one guide stud, and at least one support stud. For this purpose, the damping means has at least one hole for each of the load-bearing, guide, and support studs. Elastic dampers, such as rubber rings, are installed in at least some of these holes.

[0021] Preferably, the damping means has a truss structure formed by rod elements extending between ring elements with openings for accommodating at least one load-bearing element, at least one guide, and at least one support pin. Dampers (rubber rings) can be installed in each opening of the damping means and covered by an annular cover.

[0022] On the rotor machine frame, the damping element is located between the lower cross-bearing element and the brush holder. Accordingly, this design and placement of the damping element allows for the interconnection of each group of studs within the rotor machine frame. This ensures greater frame stability against lateral deflections and vibrations that will occur during testing due to the various functions performed by the aforementioned studs and the various loads and vibrations they bear.

[0023] The presence of an elastic damper in at least one of the openings accommodating at least one load-bearing, at least one support, and at least one guide studs helps dampen the vibrations arising therein. Thus, differences in the operation of the studs in the rotor machine frame, and their correspondingly different vibration directions, will not cause significant vibrations of the entire frame, due to their suppression by the said elastic dampers.

[0024] As a result, the use of the proposed rotary machine will reduce vibrations arising from the connection of several studs in the frame, each performing different functions, and, consequently, the vibrations occurring in the cantilevered brush holder and motor. Consequently, the impact of these vibrations on the accuracy of the tests will be limited.

[0025] Incorporating a damping element onto the rotor machine frame requires no additional modifications, and the damping element itself has a simple, flat design with holes for the corresponding studs. Therefore, its use on the proposed rotor machine will not significantly increase its design complexity.

[0026] In specific rotary machine applications, the brush holder motor housing can be mounted on an intermediate transverse support element, to which the support pins are connected. In this case, the brush holder motor itself is a stepper motor.

[0027] Furthermore, the brush holder may have seats configured to receive and secure at least one brush, and each brush may be secured to a cylindrical block made of epoxy resin.

[0028] The design of the rotary machine may also include a clamping collar for securing at least one cylindrical block made of epoxy resin with a brush on a brush holder.

[0029] Furthermore, the holder for at least one test specimen may have mounting positions configured to accommodate and secure at least one test specimen. Each test specimen may be made of feldspar ceramic and secured to a cylindrical epoxy resin block. The cylindrical epoxy resin block housing the test specimen may have an opening for supplying a fluid.

[0030] The design of the rotary machine may also include a clamping collar for securing at least one cylindrical block of epoxy resin with a test sample on a holder of at least one test sample.

[0031] In this case, monolithic cylindrical blocks made of epoxy resin can be installed on part of the mounting seats of the holder of at least one test sample.

[0032] The technical result is also achieved in a testing complex for dental materials. For this purpose, the testing complex comprises a rotary machine and a means for supplying a fluid. The rotary machine includes a brush holder for mounting at least one brush, rotatably connected to a motor. The rotary machine also includes a movable platform with a holder for at least one test sample, configured to accommodate a load. Furthermore, its design includes a frame including lower, middle, and upper transverse load-bearing elements, as well as load-bearing pins connecting the middle and lower transverse load-bearing elements, guide pins connecting the upper, middle, and lower transverse load-bearing elements, and support pins connecting the brush holder motor to the lower transverse load-bearing element.The movable platform is movable along the guide pins of the frame, and the middle transverse support element has an opening for accommodating the brush holder motor. At least one support pin, at least one guide pin, and at least one support pin are connected to a damping means having openings for at least one support pin, at least one guide pin, and at least one support pin and located between the lower transverse support element and the brush holder. Elastic dampers are installed in at least a portion of the openings of the damping means. The fluid supply means includes a pump that supplies fluid to the area between the holder of at least one test sample and the brush holder.

[0033] The proposed testing system incorporates the aforementioned rotary machine and, therefore, offers all the advantages inherent to this rotary machine. Therefore, using the testing system also improves the accuracy of dental material testing results by damping vibrations generated by the cantilevered brush holder and motor, without increasing the complexity of the rotary machine's design.

[0034] In particular embodiments of the test system, the fluid supply means may include a supporting frame and a linear stepper motor configured to transmit motion to a pump. The region between the holder of at least one test specimen and the brush holder may communicate with the fluid supply means through an opening in a cylindrical block made of epoxy resin containing the test specimen, mounted on the holder of at least one test specimen.

[0035] Furthermore, the cylindrical block made of epoxy resin with the sample under study may have at least one recess located on the opposite side from the sample under study, which is designed to interact with at least one protrusion of the mandrel of the optical profilometer.

[0036] Based on the above, it can be concluded that the use of the inventions included in the proposed group makes it possible to increase the accuracy of the results of testing dental materials, including by damping vibrations that occur on the cantilevered brush holder and motor, without significantly increasing the complexity of the design of the rotary machine.

[0037] Thus, the technical problem of ensuring the simplicity of the design of a testing complex containing a rotary machine for testing dental materials is solved, in which the influence of the design features of the rotary machine on the results of testing dental materials is reduced.

[0038] Brief description of drawings

[0039] Fig. 1 shows a side view of the test facility.

[0040] Fig. 2 shows an isometric view of the test complex.

[0041] Fig. 3 shows an isometric view of a rotary machine.

[0042] Fig. 4 shows a side view of the frame of the rotary machine.

[0043] Fig. 5 shows section B-B in Fig. 4.

[0044] Fig. 6 shows section A in Fig. 4.

[0045] Fig. 7 shows a side view of the brush holder.

[0046] Fig. 8 shows a top view of the brush holder.

[0047] Fig. 9 shows a longitudinal section of a holder for at least one test sample.

[0048] Fig. 10 shows a top view of a holder for at least one test sample.

[0049] Legends of the positions indicated in Figs. 1-10:

[0050] 1 - rotary machine;

[0051] 2 - fluid supply means;

[0052] 3 - supporting frame;

[0053] 4 - linear stepper motor;

[0054] 5 - pump;

[0055] 6 - brush holder;

[0056] 7 - brush holder seat;

[0057] 8 - brush;

[0058] 9 - epoxy resin cylindrical block;

[0059] 10 - clamping clamp;

[0060] 11 - movable platform;

[0061] 12 - holder of at least one test sample;

[0062] 13 - test sample;

[0063] 14 - a mounting location for a holder of at least one test sample;

[0064] 15 - monolithic cylindrical block made of epoxy resin;

[0065] 16 - cylindrical block made of epoxy resin with the test sample;

[0066] 17 - hole;

[0067] 18 - flexible hose;

[0068] 19 - threaded element;

[0069] 20 - engine;

[0070] 21 - frame;

[0071] 22 - lower cross-bearing element;

[0072] 23 - middle cross-bearing element;

[0073] 24 - upper cross-bearing element;

[0074] 25 - load-bearing pin;

[0075] 26 - guide pin;

[0076] 27 - support pin;

[0077] 28 - damping agent;

[0078] 29 - elastic damper;

[0079] 30 - ring cover;

[0080] 31 - intermediate transverse load-bearing element.

[0081] Implementation of the invention

[0082] Fig. 1 and 2 of the drawings of the invention show the proposed testing complex for dental materials.

[0083] The testing complex includes a rotary machine 1 and a fluid supply means 2, which includes a supporting frame 3 and a linear stepper motor 4, configured to transmit motion to a pump 5. The presented pump 5 supplies the necessary fluid, namely a suspension or solution of toothpaste used in testing dental materials. For example, a suspension of toothpaste and water can be used as a fluid, the abrasive action of which can be tested using the proposed testing complex and the rotary machine 1 included therein. It is also permissible to use a suspension containing one of the components of toothpaste, depending on the required testing program.

[0084] In this case, the rotary machine 1 includes a brush holder 6 for mounting at least one brush, connected with the possibility of rotation to the motor 20. One of the possible examples of the execution of the brush holder 6 is shown in Fig. 7 and 8.

[0085] In particular, brush holder 6 has mounting seats 7 configured to accommodate and secure at least one brush 8. Brushes from standard commercially available toothbrushes can be used in this case. Any other brushes suitable for dental materials testing conditions can also be used. Regardless of the design, each brush 8 is secured to its own cylindrical block 9 made of epoxy resin. This block is produced by placing epoxy resin in a cylindrical mold in which the desired brush 8 is mounted. The epoxy resin is then cured, forming a monolithic cylindrical block 9 made of epoxy resin that securely holds the brush 8.

[0086] To secure the cylindrical blocks 9 made of epoxy resin on the brush holder 6, a clamping collar 10 is included in its design. This ensures reliable fixation against falling out and movement of the cylindrical blocks 9 made of epoxy resin relative to the brush holder 6. At the same time, fastening can also be carried out by any other means that will allow holding the cylindrical blocks 9 made of epoxy resin throughout many cycles of testing dental materials.

[0087] The rotary machine 1 (Figs. 3 and 4) also includes a movable platform 11 with a holder 12 for at least one test sample 13, configured to accommodate a load (not shown in the figures). This load is placed on the upper surface of the movable platform 11 to create the pressing force necessary for testing.

[0088] As shown in Fig. 9 and 10, the holder 12 of at least one test sample 13 has seats 14 made with the possibility of installing and securing therein at least one test sample 13. The drawings of the invention show an example of an embodiment showing six seats 14, three of which are filled with test samples 13. At the same time, on the remaining part of the seats 14 of the holder 12 of at least one test sample 13, monolithic cylindrical blocks 15 made of epoxy resin are installed.

[0089] A feldspar ceramic block can be used as test specimen 13, which will be subjected to abrasion under the abrasive action of a fluid medium such as toothpaste or its suspension. However, any other material that can be subjected to abrasion, with the possibility of subsequent treatment of the damage resulting from the test, can also be used. Each test specimen 13 is mounted on a cylindrical block 16 made of epoxy resin.

[0090] To allow fluid to pass into the testing area located between the holder 12 of at least one test specimen 13 and the brush holder 6, the cylindrical block 16 made of epoxy resin containing the test specimen has an opening 17 for supplying the fluid. The fluid is pumped by the pump 5 of the fluid supply means 2 and, using the necessary connections, for example, flexible hoses 18, is supplied to the holder 12 of at least one test specimen 13 and then through the opening 17 into the testing area. Accordingly, the necessary conditions for the fluid formed when the brushes 8 act on the test specimens 13 are simulated.

[0091] Furthermore, the cylindrical block 16 made of epoxy resin with the test sample 13 has at least one recess 32 located on the opposite side from the test sample 13 (Fig. 9). This at least one recess 32 of the cylindrical block 16 made of epoxy resin with the test sample 13 is configured to interact with at least one projection of the mandrel of the optical profilometer. These recesses 32 are used to position the sample in the field of view of the optical profilometer before and after testing. This thereby makes it possible to measure the same area of ​​the surface of the test sample 13 by installing them in the same position all the time. This makes it possible to easily evaluate the degree of wear of the surface of the test sample 13 of interest, since it will not be necessary to determine its position relative to the mandrel of the optical profilometer before testing.

[0092] For fastening the cylindrical blocks 16 made of epoxy resin with the test samples 13 on the holder 12 of at least one test sample, a separate clamping clamp may also be provided. At the same time, it is possible to use a design in which a seat is provided for each cylindrical block 16 made of epoxy resin, and retention is achieved by pressing with a threaded element 19 or any other suitable means (Fig. 10).

[0093] Furthermore, in order to maintain the position of all elements in the desired position during testing, the rotary machine 1 includes a frame 21 (Fig. 3 and 4). The frame 21 includes a lower 22, middle 23 and upper 24 transverse bearing elements, as well as bearing pins 25 connecting the middle 23 and lower 22 transverse bearing elements, guide pins 26 connecting the upper 24, middle 23 and lower 22 transverse bearing elements and support pins 27 connecting the motor 20 and the brush holder 6 with the lower 22 transverse bearing element.

[0094] The lower 22, middle 23, and upper 24 transverse load-bearing members may have openings in their central portions. In particular, the upper 24 transverse load-bearing member has an opening for placing a load on the upper surface of the movable platform 11 and preventing it from moving along the surface of the movable platform 11. The middle 23 transverse load-bearing member has an opening for accommodating the motor 20 of the brush holder 6, and the lower 22 transverse load-bearing member has an opening for lightening the structure. The opening of the lower 22 transverse load-bearing member may also be used to drain fluid during testing.

[0095] In this case, the supporting pins 25 present in the structure of the frame 21 ensure the rigidity of the structure of the frame 21 and, together with the middle 23 and lower 22 transverse supporting elements, create a rigid base for other elements of the rotary machine 1.

[0096] Guide pins 26 pass through the entire structure of the rotary machine 1 and reinforce the supporting pins 25. At the same time, they also hold the upper 24 transverse supporting element and serve as guides for moving the movable platform 11, on which the holder 12 of at least one test sample is placed.

[0097] Furthermore, the guide pins 26 of the frame 21 are also used to guide the movement of the movable platform 11. For this purpose, the smooth cylindrical section of the guide pins 26, extending between the upper 24 and middle 23 cross-bearing elements, is used as a guide. This cylindrical section may have a thicker diameter relative to the diameter of the remaining portion of the pins (see, for example, Fig. 4). However, any other design that facilitates the movement of the movable platform 11 may also be used.

[0098] In this case, the support pins 27 serve as a support for the motor 20 and the brush holder 6 and perceive vibrations from the rotating motor 20 and the brush holder 6.

[0099] Furthermore, the design of the rotary machine 1 includes a damping means 28, to which at least one load-bearing pin 25, at least one guide pin 26, and at least one support pin 27 are connected. Thus, this damping means 28 provides a connection between the pins representing different groups in terms of the load they bear and their functional purpose. Consequently, vibrations can be transmitted from one group of pins to another through this damping means 28.

[0100] In this case, to dampen these vibrations, the damping means 28 has openings for at least one carrier 25, at least one guide 26 and at least one support 27 studs, in at least parts of which elastic dampers 29 are installed.

[0101] Preferably, the damping means 28 has a truss structure (see Fig. 5) formed by rod elements passing between annular elements with openings for accommodating at least one supporting 25, at least one guide 26 and at least one supporting 27 studs. In this case, the elastic dampers 29 are made in the form of rubber rings, which are installed in each opening of the damping means 28 and are closed by an annular cover 30 surrounding each of the studs.

[0102] The presence of this elastic damper 29 allows for the damping of vibrations transmitted through the damping means 28 from one group of studs to another. This is due, in part, to the elastic properties of the material of the elastic dampers 29, which can be, for example, rubber rings or any other elastic means.

[0103] Differences in the vibrations of different groups of studs also have a positive effect on vibration damping. Thus, the vibrations of one group of studs, whose amplitude is out of phase with the vibrations of another group of studs, will expend their energy to overcome the vibrations of the other group at any given moment. Moreover, given that the proposed invention includes several groups of studs bearing different loads due to their different purposes, this vibration damping feature will be directly evident when using the proposed solution.

[0104] This is especially true for support pins 27, on which the motor 20 and brush holder 6 are installed, and the vibrations of which differ significantly in amplitude from the vibrations of other groups of pins.

[0105] Accordingly, by using the damping means 28 of the above-mentioned structure, it is possible to dampen the vibrations occurring in the frame 21 of the rotary machine 1. This reduces the impact of these vibrations on the accuracy of the testing results of dental materials.

[0106] It should also be noted that the motor housing 20 of the brush holder 6 can be secured to an intermediate 31 transverse support member to which the support pins 27 are connected. In this case, the motor 20 of the brush holder 6 itself is preferably a stepper motor.

[0107] The proposed test complex and the rotary machine included in it are used as follows.

[0108] First, prepare the replacement test equipment. For this, brushes 8 are installed in a cylindrical block 9 made of epoxy resin and placed on a brush holder 6 using clamps 10. Then, brush holder 6 is mounted on motor 20, secured to intermediate cross-bearing member 31 and support pins 27.

[0109] The test samples 13 are placed on cylindrical epoxy resin blocks 16 containing the test samples. These cylindrical epoxy resin blocks 16 containing the test samples are then secured together with monolithic cylindrical epoxy resin blocks 15 on a holder 12 for at least one test sample. The fully assembled holder 12 for at least one test sample is then installed on the movable platform 11.

[0110] Flexible hoses 18 connected to a pump 5 are connected to this holder 12 of at least one test sample to ensure the supply of fluid through openings 17 into the test area.

[0111] The movable platform 11 is placed with the possibility of movement on the guide pins 26 of the frame 21, at the ends of which the upper transverse supporting element 24 is fixed. Then, a load is placed on the upper surface of the movable platform 11 to press the test samples 13 to the brushes 8.

[0112] Thus, the test complex and the rotary machine included in it are ready for testing.

[0113] When conducting tests, the brush holder 6 is rotated by the motor 20 and the fluid is supplied by the pump 5. Accordingly, the brushes 8 of the brush holder 6 act on the test sample 13 with abrasion of its surface in the presence of a fluid, such as toothpaste or its suspension.

[0114] The damping device 28 in the rotary machine 1 absorbs vibrations from the bearing pins 25, guide pins 26, and support pins 27. These vibrations have different amplitudes and directions due to the differences in the elements of the rotary machine 1, which are connected by corresponding groups of pins. Consequently, out-of-phase vibrations are damped. Furthermore, the presence of an elastic damper helps absorb some of the vibration energy due to its elastic properties.

[0115] This dampens the vibrations generated by the rotary machine 1 and transmitted via the bearing pins 25, guide pins 26, and support pins 27. This, in turn, improves the accuracy of dental material testing results, as it reduces the impact of factors unrelated to the test objects on the test results.

[0116] The rotary machine is maintained in operation for the required number of cycles specified by the test program. Afterwards, the cylindrical blocks 16 made of epoxy resin containing the test samples 13 are removed, and the nature and extent of any surface damage is determined. Based on the analysis of these damages, the nature and extent of the impact of the test object, such as the abrasiveness of toothpaste on composite materials simulating tooth enamel, are assessed.

[0117] Using the proposed test complex, a series of comparative tests were conducted to confirm the increase in the accuracy of studies carried out using this complex.

[0118] For this purpose, a test rig with a rotary machine of the proposed design, equipped with a damping device, was used. A test rig with a rotary machine based on the known solution from patent RU 2799136 was also used in the tests.

[0119] The comparative tests were carried out using a suspension based on ROCS toothpaste with the addition of 40 ml of water, and ROCS SMART BRUSH medium-hardness toothbrushes were used as a brush.

[0120] During comparative testing, vibrations were measured on the upper, middle, intermediate, and lower cross-bearing elements of both rotary machines. Piezoelectric sensors mounted on the surfaces of the rotor machine's components were used.

[0121] As a result, vibrations in the rotary machine using the proposed solution were found to be 23% lower than those in the rotary machine described in RU patent 2799136. Furthermore, profile analysis of the test sample also revealed a difference in the obtained results, which also reached the stated value. Accordingly, vibrations occurring in the rotary machine have a lesser impact on the dental materials tested when using the proposed invention.

[0122] Thus, it was established that the use of the inventions included in the proposed group makes it possible to increase the accuracy of the results of testing dental materials, including by damping the vibrations that arise on the cantilevered brush holder and motor, without significantly increasing the complexity of the design of the rotary machine.

[0123] Accordingly, the technical problem of ensuring the simplicity of the design of a testing complex containing a rotary machine for testing dental materials, in which the influence of the design features of the rotary machine on the testing results of dental materials is reduced, is solved.

Claims

1. Rotary testing machine for dental materials, including a brush holder for mounting at least one brush, rotatably connected to a motor, a movable platform with a holder for at least one test sample, designed with the possibility of placing a load on it, a fluid supply means configured to supply a fluid into the region between the holder of at least one test sample and the brush holder and a frame including lower, middle and upper transverse load-bearing elements, as well as load-bearing pins connecting the middle and lower transverse load-bearing elements, guide pins connecting the upper, middle and lower transverse load-bearing elements, and support pins connecting the brush holder motor to the lower transverse load-bearing element, the movable platform is designed with the ability to move along the guide pins of the frame, and the middle transverse supporting element has an opening for accommodating the brush holder motor, wherein at least one supporting pin, at least one guide pin and at least one support pin are connected to a damping means having openings for at least one supporting pin, at least one guide pin and at least one support pin and located between the lower transverse supporting element and the brush holder, and elastic dampers are installed in at least part of the openings of the damping means.

2. A rotary machine according to paragraph 1, characterized in that the housing of the brush holder motor is secured to an intermediate transverse supporting element, to which support pins are connected.

3. A rotary machine according to paragraph 1, characterized in that the brush holder motor is a stepper motor.

4. A rotary machine according to claim 1, characterized in that the brush holder has seats designed with the possibility of installing and securing at least one brush in them.

5. A rotary machine according to claim 4, characterized in that each brush is fixed on a cylindrical block made of epoxy resin.

6. A rotary machine according to claim 5, characterized in that it has a clamping collar for securing at least one cylindrical block made of epoxy resin with a brush on a brush holder.

7. A rotary machine according to claim 1, characterized in that the holder of at least one test sample has mounting seats designed with the possibility of installing and securing at least one test sample in them.

8. A rotary machine according to claim 7, characterized in that each test sample is fixed on a cylindrical block made of epoxy resin.

9. A rotary machine according to paragraph 8, characterized in that the test sample is made of feldspar ceramics.

10. A rotary machine according to claim 9, characterized in that the cylindrical block made of epoxy resin with the sample being tested has an opening for supplying a fluid medium.

11. A rotary machine according to claim 10, characterized in that it has a clamping collar for securing at least one cylindrical block of epoxy resin with a test sample on a holder of at least one test sample.

12. A rotary machine according to paragraph 11, characterized in that monolithic cylindrical blocks made of epoxy resin are installed on part of the mounting seats of the holder of at least one test sample.

13. A rotary machine according to claim 1, characterized in that the damping means has a truss structure formed by rod elements passing between ring elements with openings for accommodating at least one load-bearing element, at least one guide element, and at least one support pin.

14. A rotary machine according to paragraph 13, characterized in that the elastic dampers are rubber rings.

15. A rotary machine according to claim 14, characterized in that rubber rings are installed in each hole of the damping means and are closed by an annular cover.

16. A testing complex for dental materials, comprising a rotary machine and a means for supplying a fluid medium, wherein the rotary machine includes a brush holder for mounting at least one brush, rotatably connected to the motor, a movable platform with a holder for at least one test sample, designed to accommodate a load, a frame including lower, middle and upper transverse load-bearing elements, as well as load-bearing pins connecting the middle and lower transverse load-bearing elements, guide pins connecting the upper, middle and lower transverse load-bearing elements and support pins connecting the brush holder motor to the lower transverse load-bearing element, the movable platform is designed with the ability to move along the guide pins of the frame, and the middle transverse supporting element has an opening for accommodating the brush holder motor, wherein at least one supporting pin, at least one guide pin and at least one support pin are connected to a damping means having openings for at least one supporting pin, at least one guide pin and at least one support pin and located between the lower transverse supporting element and the brush holder, and elastic dampers are installed in at least part of the openings of the damping means, wherein the fluid supply means includes a pump that supplies fluid to the area between the holder of at least one test sample and the brush holder.

17. The test complex according to paragraph 16, characterized in that the means for supplying the fluid includes a supporting frame and a linear stepper motor, designed with the possibility of transmitting motion to the pump.

18. The test complex according to paragraph 16, characterized in that the area between the holder of at least one test sample and the brush holder communicates with the means for supplying fluid through an opening in the cylindrical block made of epoxy resin with the test sample mounted on the holder of at least one test sample.

19. The test complex according to paragraph 16, characterized in that the cylindrical block of epoxy resin with the test sample has at least one recess located on the opposite side from the test sample.

20. The testing complex according to paragraph 19, characterized in that at least one recess of the cylindrical block made of epoxy resin with the test sample is designed with the possibility of interaction with at least one protrusion of the mandrel of the optical profilometer.

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