• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A device (10, 11) comprising: a cam (20, 21); a motor configured to rotate the cam (20, 21); and at least one set (25a-25h) adapted to apply a load on a dental implant (55a-55h), each set (25a-25h) comprising at least one set: a support (50) adapted to support a dental implant (55a-55h); a guide (38) disposed between the cam (20, 21) and the assembly support (25a-25h); a first element (32) arranged in the guide (38) of the assembly (25a-25h) and adapted to contact the dental implant (55a-55h) in the support (50) of the assembly (25a-25h); a second element (34) arranged in the guide (38) of the assembly (25a-25h) and in contact with the cam (20, 21), the second element (34) being adapted to move along the guide (38) of the assembly (25a-25h); and a spring (30) disposed in the guide (38) of the assembly (25a-25h) and comprising a first end and a second end, the first end being coupled to the first element (32) of the assembly (25a-25h) and the second end coupled to the second element (34) of the assembly (25a-25h). Also a method to test dental implants with the device. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2739878A1
    申请号:ES201830801
    申请日:2018-08-01
    公开日:2020-02-04
    发明作者:Bilbao Mikel Abasolo；Celaya Josu Aguirrebeitia；Martinez Ibai Coria；De Bustos Igor Fernandez；Miguel Iker Hera
    申请人:Euskal Herriko Unibertsitatea；
    IPC主号:
    专利说明:

    [0001]
    [0002] DEVICES AND METHODS FOR DENTAL IMPLANT TESTING
    [0003]
    [0004] Field of the Invention
    [0005]
    [0006] The present invention relates to the field of dental implant testing, and more specifically, to devices for testing dental implants.
    [0007]
    [0008] Background of the invention
    [0009]
    [0010] Dental implants that are installed in patients must be certified through fatigue and loosening tests, thus ensuring their resistance against these failures. Such tests attempt to simulate the forces that occur when chewing by means of sequences of pulsating cyclic charges, that is, sequences of loading and unloading.
    [0011]
    [0012] Direct tension machines, which apply a load by means of a linear actuator on the test specimen, have been used to perform this type of test before. Thus, direct tension machines for testing various devices have been adapted to be able to test dental implants. The manufacturing costs of such machines are high due to the components it includes; In addition, the machines are designed to test a single dental implant.
    [0013]
    [0014] New devices have been developed to try to reduce the costs of performing dental implant tests.
    [0015]
    [0016] Patent document MX-2010002975-A describes a chewing simulator in which a cam acts a swinging arm which applies a load on a plurality of dental implants simultaneously. The cam must bear the load of all the implants simultaneously, which results in a high and variable load over time, which in turn requires a high power motor to move the assembly. The dimensions and weight of the components and the simulator in general makes their costs high. Likewise, the load cycles of the described chewing simulator do not exceed the frequency of 1.4 Hz, which slows down dental implant tests.
    [0017]
    [0018] Patent document CN-101441158-A describes a chewing simulator in which a cam acts a mobile plate that moves, using several guide columns, to apply a load on a plurality of dental implants simultaneously. A shock absorber is included for the correct operation of the simulator. This simulator presents problems similar to those mentioned above in relation to the other chewing simulator in terms of complexity and sizing; also, the maximum frequency of the loads is 2 Hz, which lengthens the time of the dental implant tests.
    [0019]
    [0020] There is interest in being able to perform fatigue and / or loosening tests on dental implants in an economical way and adhering to the standard norm for such tests, for example ISO 14801: 2016 Dentistry --Implants - Dynamic loading test for endosseous dental implants . This standard establishes that tests of up to five million charge-discharge cycles can be performed in a dental implant at a maximum frequency of 15 Hz, resulting in an approximate duration of 4 full days per dental implant tested. Thus, on the one hand there is interest in temporarily shortening the test process but adhering to the standard norm for such tests. On the other hand, there is also interest in the economic manufacturing and maintenance of the devices necessary to carry out the test process.
    [0021]
    [0022] Description of the invention
    [0023]
    [0024] The device and method of the present disclosure attempt to solve some or more of the problems mentioned above in various embodiments of said device or method.
    [0025]
    [0026] A first aspect of the invention relates to a device comprising: a cam; a motor configured to rotate the cam; and at least one set adapted to apply a load on a dental implant, each set comprising at least one set: a support adapted to support a dental implant; a guide arranged between the cam and the assembly support; a first element arranged in the assembly guide and adapted to contact the dental implant in the assembly support; a second element arranged in the assembly guide and in contact with the cam, the second element being adapted to move through the assembly guide; and a spring disposed in the assembly guide and comprising a first end and a second end, the first end being coupled to the first element of the assembly and the second end coupled to the second element of the assembly.
    [0027]
    [0028] The device makes it possible to carry out the test of one or more dental implants according to the number of assemblies comprising the device.
    [0029] The motor rotates the cam by means of an axis and as the cam rotates, the second element of each assembly that is in contact with it moves on its guide, specifically moves forward and backward on the guide to apply the cyclic load by way of loading and unloading. The second element follows the cam and compresses the spring of its assembly to apply the load to the dental implant in the support when the second element advances, and decompresses the spring to stop applying the load to the dental implant when the second element recoils.
    [0030] Compression of the spring results in a compression force in the first element, and the first element applies said force to the dental implant. The compression force is equal to the compression of the spring (the length that the spring is compressed is equal to the length that the second element moves when following the cam, therefore the length of the displacement depends on the eccentricity of the cam) multiplied by the spring stiffness constant.
    [0031]
    [0032] In some embodiments, the cam comprises a lobe.
    [0033]
    [0034] For each revolution of the cam, a cycle of loading and unloading of the dental implant is performed, so that the frequency of the cyclic load is the number of revolutions per second of the cam.
    [0035]
    [0036] In some embodiments, the engine is configured to rotate the cam at between 800 and 910 revolutions per minute, preferably between 850 and 905 revolutions per minute, and more preferably at 900 revolutions per minute.
    [0037] With a rotation speed of the cam of 900 revolutions per minute the device produces 15 cyclic loads per second in the dental implant (since the cam comprises a lobe), so that the fatigue test is performed as quickly as possible complying with ISO 14801.
    [0038]
    [0039] In some embodiments, the cam comprises two lobes.
    [0040]
    [0041] In some embodiments, the motor is configured to rotate the cam at between 400 and 460 revolutions per minute, preferably at 425 and 455 revolutions per minute, and more preferably at 450 revolutions per minute.
    [0042] In some embodiments, the cam comprises three lobes.
    [0043]
    [0044] In some embodiments, the motor is configured to rotate the cam at between 275 and 325 revolutions per minute, preferably at 290 to 310 revolutions per minute, and more preferably at 300 revolutions per minute.
    [0045] For each revolution of the cam, two or three cycles of loading and unloading the dental implant are performed when the cam comprises two or three lobes, respectively. To produce 15 cyclic loads per second in each dental implant, as established in the maximum ISO 14801: 2016 standard, the engine must rotate the cam at a speed two or three times higher, respectively, with respect to the rotation speed when the cam It has a lobe.
    [0046] In some embodiments, the device further comprises a reducer for the motor. In some embodiments, the device comprises a geared motor comprising the motor.
    [0047]
    [0048] In some embodiments, the support of each set of the at least one set is adapted to support the dental implant at an angle of 30 degrees with respect to the longitudinal axis of the guide of the set, that is to say with respect to the direction of the load, thus applying the load with an angle of 30 degrees on the dental implant as established by ISO 14801: 2016.
    [0049]
    [0050] In standard regulations for dental implant tests it may be established that the load to be applied on the dental implant must form an angle with respect to the axis of the implant. For example, ISO 14801: 2016 establishes that this angle must be 30 degrees. With the adaptation of the support so that it receives the dental implant so that there is such an angle with respect to the longitudinal axis of the guide it is not necessary to alter the mechanism that applies the load on the dental implant.
    [0051]
    [0052] In some embodiments, the support of each set of the at least one set comprises a control arranged to receive the load in the absence or breakage of the dental implant.
    [0053]
    [0054] When the device comprises a plurality of assemblies but there is no plurality of dental implants to be tested, and even if each assembly has a dental implant installed and one of these breaks during the test, the control of each assembly can receive the load. In this way, the device can operate continuously regardless of whether all dental implants are present and have not broken. When one of the dental implants breaks down during a fatigue test, thanks to the fact that a control takes its place, the cam continues to be self-balanced and therefore does not affect the test conditions of the rest of the implants.
    [0055] In some embodiments, the second element of each set of the at least one set comprises a sheave in contact with the cam.
    [0056] The sheave of each second element reduces friction between the cam and the second element, which facilitates the displacement of the second element and reduces the torque that the motor must support.
    [0057] In some embodiments, the first element and the second element of each set of the at least one set each comprise a carriage. These are commercial trolleys of linear guides available in the market, being therefore standardized, contrasted and economic elements.
    [0058] In some embodiments, the at least one set comprises a plurality of sets.
    [0059] The device allows to have several sets to test multiple dental implants (one per set) with the same device cam, which acts on all the sets.
    [0060] In some embodiments, the plurality of sets is arranged around the cam such that the guide of each set of the plurality of sets extends radially from the cam.
    [0061] The radial arrangement of each set (according to the guide of each set) facilitates the manipulation of the device and the testing of dental implants. The cam acts on the second element of each set as it is in the part closest to the cam.
    [0062] In some embodiments, the plurality of sets comprises eight sets; and each assembly is arranged in such a way that the assembly guide forms an angle of between 40 and 50 degrees with respect to the guide of the two adjacent assemblies, and preferably forming an angle of 45 degrees.
    [0063] This distribution minimizes the power required for the drive motor. The equidistant arrangement of the assemblies around the cam makes the system as balanced as possible, thus reducing the torque that the motor must support.
    [0064] In some embodiments, the at least one set comprises a set.
    [0065] In some embodiments, the device further comprises a microcontroller configured to operate the motor. The microcontroller can operate the motor so that it turns on, turns off and / or rotates the cam at a certain speed. The microcontroller can also receive the rotation speed from the motor and control the operation of the motor based on it, particularly the microcontroller can control the number of charge-discharge cycles supported by each implant, and adjust the motor speed to apply the number of desired load-discharge cycles per unit of time for each dental implant.
    [0066] A second aspect of the invention relates to a method comprising: providing a device according to the first aspect of the invention; place a dental implant in the support of each device assembly; and activate the motor to rotate the device cam.
    [0067] The method allows one or more dental implants to be tested so that fatigue resistance and / or loosening of one or more dental implants can be checked. When the device comprises more than one set, it is possible to test a smaller number of dental implants than the number of sets of the device; To this end, a witness can be placed in the support of each set in which a dental implant is not going to be tested, so that the device can be operated even if only one dental implant or several dental implants are placed in the support of one or more device sets.
    [0068] Advantages similar to those described for the first aspect of the invention also apply to this aspect of the invention.
    [0069] Brief description of the figures
    [0070] To complement the description and in order to help a better understanding of the characteristics of the invention, according to an example of practical implementation thereof, a set of figures in which with character is accompanied as an integral part of the description Illustrative and non-limiting, the following has been represented: Figures 1 and 2 show devices according to embodiments of the invention.
    [0071] Description of embodiments of the invention
    [0072] Figure 1 shows a device 10 for testing dental implants 55a-55b according to an embodiment of the invention.
    [0073] The device 10 comprises a cam 20 with a lobe 23 that rotates around a rotation axis 22 thanks to a motor (not shown) of device 10; The motor may be coupled to a reducer of device 10 and connected to a microcontroller of device 10 that controls it.
    [0074]
    [0075] The device 10 also comprises two sets 25a-25b, both with the same characteristics. In each assembly 25a-25b a dental implant 55a-55b can be arranged to be tested by the device 10. Each assembly 25a-25b comprises a linear guide 38, a first element 32 disposed in the guide 38 in contact with the dental implant 55a -55b, a second element 34 arranged in the guide 38 movably and in contact with the cam 20, and a spring 30 coupled to the first element 32 and the second element 34. The second element 34 of each assembly 25a-25b comprises a sheave 36 that contacts cam 20. Spring 30 is preferably a tared spring. Both the first element 32 and the second element 34 may be carriages, and which may be provided with balls for movement by the guide 38.
    [0076]
    [0077] The guide 38 of each assembly 25a-25b (and, therefore, each assembly 25a-25b) extends radially from the cam 20, the nearest end being the one in which the second element 34 is arranged. The guide 38 of each set 25a-25b is preferably a guide rail with skates.
    [0078]
    [0079] When the cam 20 rotates, the lobe 23 presses the second element 34 of each assembly 25a-25b and advances it through the guide 38 towards the first element 32, producing a compression force in the spring 30 of each assembly 25a-25b. Since the spring 30 is coupled to the first element 32, the compression force is transmitted to the first element 32 which in turn transmits the force to the dental implant 55a-55b. Therefore, the compression suffered by the spring is exerted by the followers of the cam 20, that is, the second element 34 of each assembly 25a-25b. When the lobe 23 stops pressing the second element 34, the second element 34 goes back through the guide 38 decompressing the spring 30.
    [0080]
    [0081] The dental implant 55a-55b can be arranged in the assembly 25a-25b so that its axis forms an angle with respect to the longitudinal axis of the linear guide 38, for example 30 degrees, and, therefore, the load is applied to the implant. dental 55a-55b with said angle.
    [0082]
    [0083] Figure 2 shows a device 11 for testing dental implants 55a, 55c-55h according to an embodiment of the invention.
    [0084]
    [0085] The device 11 comprises a support surface 15; the support surface can be, for example, a table with a plurality of legs 16. The device further comprises a cam 21 with three lobes 23 which rotates around the axis of rotation 22; the rotation axis 22 is perpendicular to the support surface 15. Also the device 11 comprises a motor (not shown) adapted to rotate the cam 21 around the rotation axis 22, and in some examples it also comprises a reducer coupled to the motor and / or a microcontroller connected to the motor. For example, the motor, the reducer and the microcontroller (in the case that the device 11 comprises either of the latter or both) may be arranged behind the support surface 15; the shaft 22 to which the cam 21 is coupled can pass through a hole (not shown) in the support surface 15.
    [0086]
    [0087] The device 11 further comprises a plurality of assemblies 25a-25h arranged on the support surface 15 and around the cam 21. Each assembly 25a-25h comprises a support 50 adapted to support a dental implant 55a, 55c-55h, the guide 38 linear, the first element 32 arranged in the guide 38, a second element 34 arranged in the guide 38 in such a way that it can be moved by the guide 38 and also in contact with the cam 21 by means of its sheave 36, and the spring 30 (preferably a tared spring) coupled to the first element 32 and the second element 34. The first element 32 of each assembly 25a-25h is arranged to contact the dental implant 55a, 55c-55h; when a dental implant 55a, 55c-55h is placed in the support 50, the first element 32 contacts the dental implant 55a, 55c-55h and the load can be applied thereto.
    [0088]
    [0089] Each set 25a-25h extends radially from cam 21 by means of the respective guide 38. Also, each set 25a-25h is arranged at an angle of 45 degrees with respect to adjacent sets (the set closest to each side). For example, a first set 25a is arranged at 45 degrees (defined from the axis of rotation 22 of cam 21) counterclockwise with respect to a second set 25b and at 45 degrees (defined from the axis of rotation 22 of cam 21) clockwise with respect to a third set 25h. This arrangement is advantageous for the device 11 since the power required for the motor that drives the system is the minimum possible.
    [0090]
    [0091] The support 50 of each assembly 25a-25h comprises a control 52 that receives the compression force exerted by the first element 32 when there is no or is fatigue fatigue the dental implant 55a, 55c-55h which is located in the respective support 50, for example as illustrated according to the assembly 25b in which there is no dental implant located. Thanks to the witness 52, when an implant 55a, 55c-55h is broken (or in the absence thereof) the witness 52 takes its place and the first element 32 starts to contact the witness 52, which allows to continue the test in such a way that cam 21 continues to be balanced.
    [0092]
    [0093] Each dental implant 55a, 55c-55h is subject to 15 cycles of loading and unloading per second when the cam 21 is rotated at 300 revolutions per minute.
    [0094] The design of most or all of the components of the devices 10, 11 is designed to be commercial (selectable from catalogs), which facilitates the manufacture of the devices 10, 11 as well as the maintenance and / or replacement of said components , also with an economic cost savings. Also, the effort to which the cam 20, 21 is subjected is less than in prior art solutions, which makes the dimensions of the cam 20, 21 can be smaller.
    [0095]
    [0096] In this text, the word “understand” and its variants (such as “understanding”, etc.) should not be construed as excluding, that is, they do not exclude the possibility that what is described includes other elements, steps, etc.
    [0097] On the other hand, the invention is not limited to the specific embodiments that have been described but also covers, for example, the variants that can be made by the average person skilled in the art (for example, in terms of the choice of materials, dimensions , components, configuration, etc.), from what follows from the claims.
    权利要求:
    Claims (13)
    [1]
    1. - A device (10.11) comprising:
    a cam (20.21);
    a motor configured to rotate the cam (20,21); Y
    at least one set (25a-25h) adapted to apply a load on a dental implant (55a-55h), each set (25a-25h) comprising at least one set a support (50) adapted to support a dental implant (55a -55h);
    characterized in that each set (25a-25h) of the at least one set further comprises:
    a guide (38) disposed between the cam (20,21) and the assembly support (25a-25h);
    a first element (32) arranged in the guide (38) of the assembly (25a-25h) and adapted to contact the dental implant (55a-55h) in the support (50) of the assembly (25a-25h);
    a second element (34) arranged in the guide (38) of the assembly (25a-25h) and in contact with the cam (20,21), the second element (34) being adapted to move along the guide (38) of the assembly (25a-25h); and a spring (30) arranged in the guide (38) of the assembly (25a-25h) and comprising a first end and a second end, the first end being coupled to the first element (32) of the assembly (25a-25h) and the second end coupled to the second element (34) of the assembly (25a-25h).
    [2]
    2. - The device (11) of claim 1, wherein the cam (21) comprises three lobes (23).
    [3]
    3. - The device (10.11) of any of the preceding claims, wherein the motor is configured to rotate the cam (20.21) at between 275 and 325 revolutions per minute, and preferably at 300 revolutions per minute.
    [4]
    4. - The device (10,11) of any of the preceding claims, wherein the support (50) of each set (25a-25h) of the at least one set is adapted to support the dental implant (55a-55h) forming an angle of 30 degrees with respect to the longitudinal axis of the guide (38) of the assembly (25a-25h).
    [5]
    5. - The device (11) of any of the preceding claims, wherein the support (50) of each set (25a-25h) of the at least one set comprises a control (52) arranged to receive the load in the absence or rupture of the dental implant (55a-55h).
    [6]
    6. - The device (10,11) of any of the preceding claims, wherein the second element (34) of each set (25a-25h) of the at least one set comprises a sheave (36) in contact with the cam (20.21).
    [7]
    7. - The device (10.11) of any of the preceding claims, the first element (32) and the second element (34) of each set (25a-25h) of the at least one set each comprise a carriage (32 ,3. 4).
    [8]
    8. - The device (10.11) of any one of the preceding claims, wherein the at least one set (25a-25h) comprises a plurality of sets (25a-25h).
    [9]
    9. - The device (10.11) of claim 8, wherein the plurality of sets (25a-25h) are arranged around the cam (20,21) such that the guide (38) of each set (25a-25h) of the plurality of sets extends from the cam (20,21) radially.
    [10]
    10. - The device (11) of claim 9, wherein the plurality of sets (25a-25h) comprises eight sets (25a-25h); and in which each set (25a-25h) is arranged in such a way that the guide (38) of the set (25a-25h) forms an angle of 45 degrees with respect to the guide (38) of the two sets (25a-25h) ) adjacent.
    [11]
    11. - The device of any one of claims 1 to 7, wherein the at least one set (25a-25h) comprises a set.
    [12]
    12. - The device of any of the preceding claims, which further comprises a microcontroller configured to operate the motor.
    [13]
    13. - A method comprising:
    providing the device (10.11) of any of the preceding claims;
    place a dental implant (55a-55h) on the support (50) of each set (25a-25h) of the device (10.11); Y
    activate the motor to rotate the cam (20,21) of the device (10,11).
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    同族专利:
    公开号 | 公开日
    ES2739878B2|2020-07-24|
    WO2020025755A1|2020-02-06|
    引用文献:
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    US2849877A|1955-10-14|1958-09-02|Goodyear Tire & Rubber|Apparatus for fatigue testing of elastomers|
    JPS5817338A|1981-07-23|1983-02-01|Shinshikai|Tester for strength of dental muzzleloading crown against repeating strike|
    US5743732A|1996-09-27|1998-04-28|Watson; Jeffrey A.|Wovsaniker dynamic jaw model|
    CN201119923Y|2007-08-29|2008-09-24|陈强|Mastication simulation fatigue mechanical test machine|
    CN101441158A|2008-12-04|2009-05-27|四川大学|Chaw simulation circulation load application machine for dentistry|
    MX2010002975A|2010-03-18|2011-09-19|Univ Autonoma De Nuevo Leon|Chewing simulator for performing fatigue and wear tests in dental implants and repairs.|
    US20140053655A1|2012-08-23|2014-02-27|Bose Corporation|Endosseous dental implant loading fixture|
    SU1118360A1|1982-12-27|1984-10-15|Московский Ордена Трудового Красного Знамени Медицинский Стоматологический Институт Им.Н.А.Семашко|Apparatus for determining parameters of contact-friction fatigue, preferably of dental materials|CN111721610A|2020-06-05|2020-09-29|佛山市安齿生物科技有限公司|Fatigue test loading device for dental implant|
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201830801A|ES2739878B2|2018-08-01|2018-08-01|DEVICES AND METHODS FOR TESTING DENTAL IMPLANTS|ES201830801A| ES2739878B2|2018-08-01|2018-08-01|DEVICES AND METHODS FOR TESTING DENTAL IMPLANTS|
    PCT/EP2019/070783| WO2020025755A1|2018-08-01|2019-08-01|Devices and methods for testing dental implants|
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