Orthodontic periodontal membrane mechanical testing device

Abstract

The invention relates to the technical field of oral medical instruments, and discloses an orthodontic periodontal membrane mechanical testing device which comprises a table body, a base, two clamping assemblies, two driving assemblies and a pressure measuring assembly. The two clamping assemblies are slidably arranged on the two sides of the base correspondingly, each clamping assembly comprises a clamping base of an arc-shaped structure, a cavity is formed in the side, away from the base, of the interior of each clamping base, an air inlet hole communicating with the cavity is formed in each clamping base, and a plurality of through holes communicating with the cavities are formed in the side wall, close to the base, of each clamping base; a clamping rod for selectively clamping the alveolar bone and the teeth is connected into the through hole in a sliding manner; the two driving assemblies are used for driving the corresponding clamping assemblies to get close to or away from the base. The pressure measuring assembly is used for applying pressure to the alveolar bone and the teeth in the vertical direction. According to the invention, the surfaces of the alveolar bone and the teeth can be fixed from a plurality of positions, and the alveolar bone and the teeth can be protected while the plurality of clamping rods are in contact with the surfaces of the alveolar bone and the teeth.

Description

Technical Field

[0001] The invention relates to the technical field of oral medical instruments, and more specifically to an oral orthodontic periodontal ligament mechanics testing device. Background Art

[0002] The periodontal ligament (periodontal ligament, periodontal space) is composed of dense connective tissue. Most of the fibers of the periodontal ligament are arranged in bundles, one end of the fiber is buried in the cementum, and the other end is buried in the bone wall of the alveolar socket, so that the teeth are fixed in the alveolar socket. There are nerves, blood vessels, lymph and epithelial cells in the periodontal ligament. Oral orthodontics refers to the direct or indirect application of orthodontic force on teeth and their supporting tissues, thereby causing a series of tissue biochemical reactions to achieve the purpose of tooth movement. In this process, orthodontic force is the external inducement of tooth movement, and the biomechanical response of the periodontal ligament is the determining factor that causes tooth movement and the speed of tooth movement. The biomechanical properties of the periodontal ligament are the key to correctly understanding orthodontic tooth movement, tissue response and formulating orthodontic treatment plans. The current research on the biomechanical properties of periodontal tissues is mainly a combination of numerical simulation and test experiments. Accurate numerical simulation can accurately predict the biomechanical response of the periodontal ligament in orthodontics, but good simulation prediction requires the establishment of an accurate biomechanical model.

[0003] However, due to the complexity and tinyness of the periodontal ligament structure, the alveolar bone and tooth of each tooth have different shapes and uneven surfaces. Traditional large metal material testing machines are not effective for periodontal ligaments with smaller structures. When testing the mechanical properties of the periodontal ligament, especially the compression test, the existing clamping device is difficult to fit the uneven surface of the alveolar bone and teeth, so that the alveolar bone and teeth are prone to shaking during the test. Summary of the invention

[0004] The present invention provides an oral orthodontic periodontal ligament mechanical testing device, which solves the technical problem that the existing clamping device in the related art is difficult to fit with the uneven surface of the alveolar bone and the teeth, so that the alveolar bone and the teeth are prone to shaking during the test.

[0005] The present invention provides an oral orthodontic periodontal ligament mechanical testing device, comprising: a platform; a base, the base is arranged on the platform and used to place alveolar bones and teeth; two clamping assemblies, the two clamping assemblies are respectively slidably arranged on both sides of the base and used to clamp the alveolar bones and teeth, the clamping assembly comprises: a clamping seat with an arc structure, a cavity is provided on the side of the clamping seat away from the base, a plurality of through holes connected with the cavity are provided on a side wall of the clamping seat close to the base, a clamping rod for selectively clamping the alveolar bones and teeth is slidably connected inside the through hole, and an air inlet connected with the cavity is provided on the clamping seat; two driving assemblies, the two driving assemblies are both arranged on the platform, the two driving assemblies correspond to the two clamping assemblies one by one, and are used to drive the corresponding clamping assemblies to approach or move away from the base; a pressure measuring assembly, which is arranged on the platform and used to apply pressure to the alveolar bones and teeth in a vertical direction.

[0006] As a further improvement of the present invention, the plurality of through holes are distributed in an axial annular array along the clamping seat.

[0007] As a further improvement of the present invention, the bottom of the clamping seat is flush with the top of the base.

[0008] As a further improvement of the present invention, a first step portion is arranged inside the through hole, and the diameter of the first step portion close to the base is smaller than the diameter of the side away from the base; a second step portion is arranged on the clamping rod, and the diameter of the second step portion close to the base is smaller than the diameter of the side away from the base, and the diameter of the second step portion close to the base is the same as the diameter of the first step portion close to the base, and a spring is arranged between the second step portion and the first step portion.

[0009] As a further improvement of the present invention, a groove is provided in the middle of the base.

[0010] As a further improvement of the present invention, a surface of one end of the clamping rod facing the base is an arc-shaped structure.

[0011] As a further improvement of the present invention, two rectangular seats are symmetrically arranged on the platform on both sides of the base, and rectangular grooves are opened in the rectangular seats, and the two rectangular grooves correspond to the two driving components one by one; the driving component includes: a screw, a nut seat and a knob, one end of the screw is rotatably connected to the inner wall of the corresponding rectangular groove on one side close to the base, and the other end of the screw passes through the inner wall on the other side opposite to the rectangular groove to the outside of the rectangular seat and is fixedly connected to the knob, the nut seat is threadedly connected to the screw, and the nut seat is connected to the bottom of the corresponding clamping seat.

[0012] As a further improvement of the present invention, in the direction perpendicular to the axis of the screw, the length of the nut seat is the same as the length of the rectangular groove.

[0013] As a further improvement of the present invention, the pressure measurement assembly includes: a U-shaped support frame with an opening downward, a cylinder, and a pressure sensor. The support frame is fixedly connected to the table body. One end of the cylinder is fixedly connected to the middle of the support frame, and the telescopic end of the cylinder is fixedly connected to the pressure sensor to drive the pressure sensor to apply pressure to the alveolar bone and teeth.

[0014] As a further improvement of the present invention, the orthodontic periodontal ligament stretching test device for the oral cavity further includes: a bottom plate. The bottom plate is fixedly connected to the bottom of the table body. Two air pumps are arranged on the bottom plate. The two air pumps correspond to the two air inlets one by one, and the air pumps are communicated with the corresponding air inlets.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By arranging a plurality of clamping rods in the clamping assemblies on both sides, the alveolar bone and teeth can be fixed from multiple positions. Since the volume of the clamping rods is relatively small compared to the alveolar bone and teeth, the clamping rods can better fit the uneven surfaces of the alveolar bone and teeth, making the alveolar bone and teeth more stable during the test.

[0017] 2. By inflating the cavity to push a plurality of clamping rods to clamp the alveolar bone and teeth, compared with mechanically pushing a plurality of clamping rods to move together, it can make all the clamping rods contact the surfaces of the alveolar bone and teeth, and can reduce the pressure of the clamping rods that have already contacted the alveolar bone and teeth on the alveolar bone and teeth, realizing the protection of the alveolar bone and teeth. Description of the Drawings

[0018] Figure 1 is the first three-dimensional structural schematic diagram of an orthodontic periodontal ligament mechanical test device according to an embodiment of the present invention;

[0019] Figure 2 is the second three-dimensional structural schematic diagram of an orthodontic periodontal ligament mechanical test device according to an embodiment of the present invention;

[0020] Figure 3 is the top view structural schematic diagram of an orthodontic periodontal ligament mechanical test device according to an embodiment of the present invention;

[0021] Figure 4 is the first top view sectional structural schematic diagram of an orthodontic periodontal ligament mechanical test device according to an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of a second top cross-sectional structure of an oral orthodontic periodontal ligament mechanical testing device according to an embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of a third top-view cross-sectional structure of an oral orthodontic periodontal ligament mechanical testing device according to an embodiment of the present invention;

[0024] Figure 7 yes Figure 6 The enlarged view of point A in the middle;

[0025] Figure 8 It is a schematic diagram of a fourth top cross-sectional structure of an oral orthodontic periodontal ligament mechanical testing device according to an embodiment of the present invention;

[0026] Fig. 9 It is a schematic diagram of a side cross-sectional structure of an oral orthodontic periodontal ligament mechanical testing device according to an embodiment of the present invention;

[0027] Fig.10 It is a schematic diagram of the main cross-sectional structure of an oral orthodontic periodontal ligament mechanical testing device according to an embodiment of the present invention.

[0028] In the figure: 1, platform; 11, rectangular seat; 111, rectangular groove; 2, base; 21, groove; 3, clamping assembly; 31, clamping seat; 32, cavity; 33, through hole; 331, first step portion; 34, clamping rod; 341, second step portion; 35, air inlet; 36, air pump; 37, spring; 4, driving assembly; 41, screw; 42, nut seat; 43, knob; 5, pressure measurement assembly; 51, support frame; 52, cylinder; 53, pressure sensor; 6, bottom plate. DETAILED DESCRIPTION

[0029] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0030] like Figure 1-Figure 10As shown, an oral orthodontic periodontal ligament mechanical testing device includes: a platform 1, a base 2, two clamping components 3, two driving components 4 and a pressure measuring component 5. It should be noted that this device is mainly used to measure the compressive strength of the periodontal ligament. Among them, the platform 1 mainly plays a supporting and mounting role. The base 2 mainly plays a supporting role. The two clamping components 3 mainly play a role in clamping the alveolar bone and teeth. The two driving components 4 mainly play a role in driving the two clamping components 3 to drive the two clamping components 3 to move. The pressure measuring component 5 is mainly used to apply pressure to the alveolar bone and teeth, so as to measure the compressive strength of the periodontal ligament.

[0031] Specifically, Figure 4 As shown, the base 2 may be a cylindrical structure, and the base 2 is fixedly connected to the platform body 1, so that the setting of the base 2 can be more reliable and stable, so that the base 2 can better support the alveolar bone and teeth.

[0032] In addition, the two clamping assemblies 3 are respectively slidably arranged on both sides of the base 2, and the alveolar bone and the teeth are selectively clamped by moving on the platform 1. When the two clamping assemblies 3 are close to the base 2, the two clamping assemblies 3 can fix the alveolar bone and the teeth on the base 2, and when the two clamping assemblies 3 move away from the base 2, the alveolar bone and the teeth on the base 2 are released. It should be noted that the moving routes of the two clamping assemblies 3 are collinearly arranged.

[0033] Specifically, Figure 3-Figure 7 As shown, the clamping assembly 3 includes: a clamping seat 31 of an arc-shaped structure, a cavity 32 is provided on the side of the clamping seat 31 away from the base 2, a plurality of through holes 33 connected to the cavity 32 are provided on a side wall of the clamping seat 31 close to the base 2, a clamping rod 34 for selectively clamping the alveolar bone and teeth is slidably connected inside the through hole 33, and an air inlet 35 connected to the cavity 32 is provided on the clamping seat 31. The clamping seat 31 is set to an arc-shaped structure, so that the alveolar bone and teeth can be wrapped to a certain extent, so that the alveolar bone and teeth can be clamped at multiple angles, and the setting of the alveolar bone and teeth can be made more stable, which is convenient for measuring the compressive strength of the periodontal membrane.

[0034] When in use, firstly, the air inlet 35 is used to inflate the cavity 32, and the gas inside the cavity 32 will enter the multiple through holes 33, so as to push the clamping rods 34 inside the through holes 33 to move toward the alveolar bone and the teeth, thereby achieving the fixation of the alveolar bone and the teeth. It should be noted that, due to the uneven surfaces of the alveolar bone and the teeth, not all the clamping rods 34 are in contact with the surface of the alveolar bone or the teeth at the same time. After some of the clamping rods 34 are in contact with the corresponding parts of the alveolar bone and the teeth, the gas inside the cavity 32 will preferentially push the clamping rods 34 located in other through holes 33 to move until all the clamping rods 34 are in contact with the alveolar bone or the tooth surface, and will not continue to apply strong pressure to the clamping rods 34 that have been in contact with the alveolar bone and the teeth, thereby protecting the alveolar bone and the teeth.

[0035] Furthermore, if Fig. 9 and Fig.10 As shown, the plurality of through holes 33 are distributed in an axial annular array along the clamping seat 31. In this way, the distribution of the plurality of through holes 33 on the clamping seat 31 can be more comprehensive and uniform, so that the distribution of the plurality of clamping rods 34 can be more comprehensive and uniform, and then the plurality of clamping rods 34 can clamp the alveolar bone or the tooth from multiple positions, so that the alveolar bone and the tooth are more stable during the test.

[0036] In addition, if Fig.10 As shown, the bottom of the clamping seat 31 is flush with the top of the base 2. In this way, when the clamping seat 31 slides on the platform 1, interference with the base 2 can be avoided, which is conducive to the movement of the clamping seat 31, and further facilitates the clamping cooperation between the clamping rod 34 and the alveolar bone and the teeth.

[0037] In addition, if Figure 7As shown, a first step portion 331 is provided inside the through hole 33, and the diameter of the first step portion 331 on the side close to the base 2 is smaller than the diameter of the side away from the base 2. A second step portion 341 is provided on the clamping rod 34, and the diameter of the second step portion 341 on the side close to the base 2 is smaller than the diameter of the side away from the base 2, and the diameter of the second step portion 341 on the side close to the base 2 is the same as the diameter of the first step portion 331 on the side close to the base 2, and a spring 37 is provided between the second step portion 341 and the first step portion 331. In other words, the side of the through hole 33 close to the base 2 can limit the side of the clamping rod 34 away from the base 2, so as to prevent the limiting rod from being separated from the through hole 33 under the force of the gas. The spring 37 mainly plays a role of resetting. When the fixation of the alveolar bone and the tooth is released, that is, when the air inside the cavity 32 is discharged, the clamping rod 34 will shrink to the inside of the through hole 33 under the action of the spring 37, so as to avoid the interference between the clamping rod 34 and other components, and also facilitate the use of the next experiment. It should be noted that, in the initial state, ie, when no gas is introduced into the cavity 32 , the end of the clamping rod 34 close to the base 2 is located inside the through hole 33 .

[0038] As an optional embodiment, Figure 7 As shown, the surface of one end of the clamping rod 34 facing the base 2 is an arc-shaped structure. The arc-shaped structure can reduce the contact area between the clamping rod 34 and the alveolar bone or teeth, so that the clamping rod 34 can better fit the uneven surface of the alveolar bone or teeth.

[0039] As an optional embodiment, Figure 4 As shown, a groove 21 is provided in the middle of the base 2. The groove 21 can mainly play a limiting role, and the alveolar bone and teeth are placed in the groove 21. The inner wall of the groove 21 can limit the bottom of the alveolar bone and the teeth, so that the placement of the alveolar bone and the teeth is more stable, which is conducive to applying pressure to the alveolar bone and the teeth.

[0040] In addition, if Figure 3 As shown, two rectangular seats 11 are symmetrically arranged on both sides of the base 2 on the platform 1, and rectangular grooves 111 are opened in the rectangular seats 11. The two rectangular grooves 111 correspond to the two driving components 4 one by one, respectively. The two driving components 4 are both arranged on the platform 1, and the two driving components 4 correspond to the two clamping components 3 one by one, and are used to drive the corresponding clamping components 3 to approach or move away from the base 2.

[0041] Specifically, Figure 2 and Figure 8As shown in the figure, the driving assembly 4 includes a screw rod 41, a nut seat 42, and a knob 43. One end of the screw rod 41 is rotatably connected to the inner wall of one side of the corresponding rectangular groove 111 close to the base 2, and the other end of the screw rod 41 passes through the inner wall of the other side opposite to the rectangular groove 111 to the outside of the rectangular seat 11 and is fixedly connected to the knob 43. The nut seat 42 is threadedly connected to the screw rod 41, and the nut seat 42 is connected to the bottom of the corresponding clamping seat 31.

[0042] During use, when it is necessary to test the compressive strength of the periodontal ligament, it is first necessary to fix the alveolar bone and the tooth. At this time, the knob 43 needs to be rotated. The rotation of the knob 43 will drive the screw rod 41 to rotate, and the rotation of the screw rod 41 can further drive the nut seat 42 to move along the axis direction of the screw rod 41. The movement of the nut seats 42 on both sides can further drive the clamping assemblies 3 on both sides to approach each other, thereby facilitating the clamping of the alveolar bone and the tooth. Moreover, by driving the movement of the clamping assemblies 3 on both sides, it is also applicable to the clamping of alveolar bones and teeth of various different sizes, and the applicable range is wider.

[0043] As an alternative embodiment, in the direction perpendicular to the axis of the screw rod 41, the length of the nut seat 42 is the same as the length of the rectangular groove 111. That is, in the direction perpendicular to the axis of the screw rod 41, the two side walls of the nut seat 42 are in contact with the two side walls of the rectangular groove 111, so that the nut seat 42 can be limited by the rectangular groove 111, thereby avoiding the nut seat 42 rotating together with the screw rod 41, and further improving the stability of the clamping assembly 3 during movement.

[0044] In addition, as Figure 1 shown, the pressure measuring assembly 5 is arranged on the table body 1 and is used to apply pressure to the alveolar bone and the tooth in the vertical direction. That is, when the clamping assemblies 3 on both sides fix the alveolar bone and the tooth, the pressure measuring assembly 5 can apply pressure to the alveolar bone and the tooth from above the alveolar bone and the tooth.

[0045] Specifically, the pressure measuring assembly 5 includes a U-shaped support frame 51 with an opening downward, a cylinder 52, and a pressure sensor 53. The support frame 51 is fixedly connected to the table body 1. One end of the cylinder 52 is fixedly connected to the middle of the support frame 51, and the telescopic end of the cylinder 52 is fixedly connected to the pressure sensor 53 to drive the pressure sensor 53 to apply pressure to the alveolar bone and the tooth. During use, the cylinder 52 is started, and the telescopic end of the cylinder 52 will drive the pressure sensor 53 to apply pressure to the alveolar bone and the tooth. At this time, the pressure data of the pressure sensor 53 can be recorded, and the changes of the alveolar bone, the tooth, and the periodontal ligament located between the alveolar bone and the tooth can be observed.

[0046] In addition, as Figure 1As shown, the oral orthodontic periodontal membrane tensile testing device also includes a base plate 6, which is fixedly connected to the bottom of the platform 1. Two air pumps 36 are arranged on the base plate 6. The two air pumps 36 correspond to the two air inlet holes 35 one by one, and the air pumps 36 are connected to the corresponding air inlet holes 35. Among them, the air pump 36 mainly plays the role of exhausting and delivering air. During the clamping work, the air pump 36 can be started to deliver air to the inside of the cavity 32 through the corresponding air inlet holes 35, so that the corresponding clamping rod 34 can be pushed to clamp the alveolar bone and the teeth. In the process of releasing the fixation, the air inside the cavity 32 can be discharged through the corresponding air inlet holes 35 by starting the air pump 36, so that the clamping rod 34 can be retracted to the inside of the through hole 33.

[0047] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An orthodontic periodontal ligament mechanical testing device, characterized in that: include: Platform (1); A base (2), the base (2) being arranged on the platform body (1) and being used for placing alveolar bones and teeth; Two clamping assemblies (3), the two clamping assemblies (3) are respectively slidably arranged on both sides of the base (2) for clamping the alveolar bone and the teeth, the clamping assemblies (3) comprising: a clamping seat (31) of an arc-shaped structure, a cavity (32) is provided inside the clamping seat (31) on a side away from the base (2), a plurality of through holes (33) communicating with the cavity (32) are provided on a side wall of the clamping seat (31) close to the base (2), a clamping rod (34) for selectively clamping the alveolar bone and the teeth is slidably connected inside the through hole (33), and an air inlet (35) communicating with the cavity (32) is provided on the clamping seat (31); Two driving assemblies (4), both of which are arranged on the platform (1), the two driving assemblies (4) correspond one to one to the two clamping assemblies (3), and are used to drive the corresponding clamping assemblies (3) to move closer to or away from the base (2); A pressure measurement component (5) is arranged on the platform (1) and is used to apply pressure to the alveolar bone and teeth in a vertical direction.

2. An orthodontic periodontal ligament mechanical testing device according to claim 1, characterized in that: The plurality of through holes (33) are distributed in an axial annular array along the clamping seat (31).

3. The device for testing the mechanical properties of periodontal ligaments in oral orthodontics according to claim 1, characterized in that: The bottom of the clamping seat (31) is flush with the top of the base (2).

4. The device for testing the mechanical properties of periodontal ligaments in oral orthodontics according to claim 1, characterized in that: A first step portion (331) is provided inside the through hole (33), and the diameter of the first step portion (331) on a side close to the base (2) is smaller than the diameter on a side away from the base (2); The clamping rod (34) is provided with a second step portion (341), and the diameter of the second step portion (341) on the side close to the base (2) is smaller than the diameter of the side away from the base (2), and the diameter of the second step portion (341) on the side close to the base (2) is the same as the diameter of the first step portion (331) on the side close to the base (2), and a spring (37) is provided between the second step portion (341) and the first step portion (331).

5. The device for testing the mechanical properties of periodontal ligaments in oral orthodontics according to claim 1, characterized in that: A groove (21) is provided in the middle of the base (2).

6. The device for testing the mechanical properties of periodontal ligaments in orthodontics according to claim 1, characterized in that: The surface of one end of the clamping rod (34) facing the base (2) is an arc-shaped structure.

7. The device for testing the mechanical properties of periodontal ligaments in orthodontics according to claim 1, characterized in that: Two rectangular seats (11) are symmetrically arranged on the platform (1) on both sides of the base (2), and a rectangular groove (111) is opened in the rectangular seat (11), and the two rectangular grooves (111) correspond to the two driving components (4) one by one respectively; The driving assembly (4) includes: a screw rod (41), a nut seat (42) and a knob (43). One end of the screw rod (41) is rotatably connected to the inner wall of the corresponding rectangular groove (111) close to the base (2), and the other end of the screw rod (41) passes through the inner wall of the other side opposite to the rectangular groove (111) to the outside of the rectangular seat (11) and is fixedly connected to the knob (43). The nut seat (42) is threadedly connected to the screw rod (41), and the nut seat (42) is connected to the bottom of the corresponding clamping seat (31).

8. An orthodontic periodontal ligament mechanical testing device according to claim 7, characterized in that: In the direction perpendicular to the axis of the screw rod (41), the length of the nut seat (42) is the same as the length of the rectangular groove (111).

9. The device for testing the mechanical properties of periodontal ligaments in oral orthodontics according to claim 1, characterized in that: The pressure measuring assembly (5) includes: a U-shaped support frame (51) with an opening downward, a cylinder (52) and a pressure sensor (53). The support frame (51) is fixedly connected to the table body (1). One end of the cylinder (52) is fixedly connected to the middle of the support frame (51), and the telescopic end of the cylinder (52) is fixedly connected to the pressure sensor (53) to drive the pressure sensor (53) to apply pressure to the alveolar bone and teeth.

10. The device for testing the mechanical properties of periodontal ligaments in oral orthodontics according to claim 1, characterized in that: The oral orthodontic periodontal membrane stretching test device further includes: a bottom plate (6). The bottom plate (6) is fixedly connected to the bottom of the table body (1). Two air pumps (36) are arranged on the bottom plate (6). The two air pumps (36) correspond to the two air inlets (35) one by one, and the air pump (36) is communicated with the corresponding air inlet (35).

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