Orthodontic device with forward traction and molar distalization functions

Abstract

The invention discloses an orthodontic device with forward traction and molar distalization functions, the orthodontic device comprises a dental arch and an arch expander, the arch expander is divided into a left part and a right part, the left part and the right part of the arch expander are connected through a bidirectional screw and a guide rod, the bidirectional screw drives the two parts of the arch expander to simultaneously move outwards, and the two parts of the arch expander are connected with the guide rod. The aim of expanding the dental arch of the patient is fulfilled; the left side and the right side of the arch expander are respectively provided with a premolar band, the premolar bands sleeve premolar teeth of a dental arch, molar teeth of the dental arch are sleeved with molar bands, a push rod is arranged between the molar bands and the premolar bands, and the push rod exerts backward pushing force on the molar bands. The molar band is connected with the arch expander through an adjusting screw rod and is used for applying backward thrust to the molar from the inner side of a dental arch; a jaw base is arranged at the front end of the arch expander, fits the jaw of the human body in shape and applies forward thrust to the jaw of the human body. The treatment period is greatly shortened, and the treatment effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of oral orthodontics, and in particular to an oral orthodontic device with the functions of frontal traction and molar distalization. Background Art

[0002] In clinical practice, orthodontic treatment of Class III malocclusion with dental crowding is a common disease. Many patients with Class III malocclusion present with maxillary underdevelopment, dental crowding, and mesial displacement of molars. Traditional treatment is generally carried out in stages. First, anterior traction is performed to promote maxillary development and correct maxillary retraction. After coordinating the relationship between the upper and lower jaws, molar distalization is performed to provide space and relieve crowding. This segmented treatment has significant defects. The treatment cycle is long, which can be as long as 2 to 3 years. Patients have to face the discomfort and aesthetic problems of the orthodontic device for a long time. On the other hand, the reaction force generated by the distal displacement of the molars can easily lead to labial inclination of the maxillary anterior teeth, and the vertical component of the anterior traction may induce clockwise rotation of the mandible, aggravating the deterioration of the facial shape in high-angle cases.

[0003] Current molar distalization technologies mainly include extraoral bows, swinging appliances, anchorage pins, and invisible braces. Although extraoral bows can effectively push molars distally, they rely on patient cooperation (wearing them for 12 to 14 hours a day). Daytime discontinuation of wear can easily lead to relapses, and there are problems such as facial scarring. Swinging appliances directly apply force to the premolars and the hard palate tissue of the maxillary anterior teeth, which can easily cause complications such as lip inclination of the anterior teeth. Invisible braces have certain advantages in molar distalization, but biomechanical studies have shown that when invisible braces are used to distalize molars, they can easily cause distal tilting, elongation, and lingual tilting of the posterior tooth crowns, and the anterior teeth are prone to lip inclination. In addition, invisible braces require high patient compliance.

[0004] In summary, there is an urgent need in the market for an orthodontic device that can achieve coordinated forward traction and molar distalization, shorten the course of treatment, and reduce side effects. Summary of the Invention

[0005] The purpose of the present invention is to provide an oral orthodontic device with forward traction and molar distalization functions, aiming to improve the problems in the prior art of Class III malocclusion with crowded dentition, such as long treatment period, obvious side effects, and high patient compliance requirements.

[0006] The present invention is achieved in that: The utility model provides an orthodontic device with front traction and molar distal movement function, comprising a dental arch and a transverse arch expander, the transverse arch expander is divided into left and right parts, and the left and right parts of the transverse arch expander are connected through a bidirectional screw rod and a guide rod, the two parts of the transverse arch expander are driven to move outward simultaneously through the bidirectional screw rod, so as to achieve the purpose of expanding the dental arch of the patient; the left and right sides of the transverse arch expander are provided with premolar rings, the premolar rings are sleeved on the premolars of the dental arch, the molar rings are sleeved on the molars of the dental arch, a push rod is arranged between the molar rings and the premolar rings, the push rod applies a rearward pushing force to the molar rings, the molar rings and the transverse arch expander are connected through an adjusting screw rod, and the adjusting screw rod is used for applying a rearward pushing force to the molars from the inside of the dental arch; the front end of the transverse arch expander is provided with a palate base, the palate base is fitted to the shape of the human palate and applies a forward pushing force to the human palate.

[0007] Preferably, the first connecting rod is fixedly connected to the inside of the premolar rings, and the first connecting rod is curved upward to the palate and is used for fitting the palate of the patient during installation.

[0008] Preferably, the second connecting rod is provided at the rear end of the left and right sides of the transverse arch expander, the second connecting rod is provided with an adapter at the end, the adapter is provided with a bearing at the middle, the end of the adjusting screw rod is connected to the bearing in an interference fit, and the rearward pushing force applied to the molar rings is realized by rotating the adjusting screw rod.

[0009] Preferably, the premolar rings are provided with a first mounting column on one side of the outer side of the dental arch, the first mounting column is provided with a first mounting groove at the end towards the molar rings, the molar rings are provided with a second mounting column on one side of the outer side of the dental arch, the second mounting column is provided with a second mounting groove at the end towards the premolar rings, the shaft centers of the first mounting column and the second mounting column are on the same straight line, and the two ends of the push rod are respectively inserted into the inside of the first mounting groove and the second mounting groove; the premolar rings are provided with traction hooks in the direction towards the front end of the dental arch.

[0010] Preferably, the transverse arch expander is provided with a gap at the middle, the guide rod is provided with two, and the two guide rods are symmetrically arranged in the front and rear directions of the bidirectional screw rod; the bidirectional screw rod is provided with a partition column in the gap of the transverse arch expander, the partition column is used for separating the threads in two different directions on the bidirectional screw rod, the bidirectional screw rod can drive the left and right parts of the transverse arch expander to move close to or away from each other by rotating, and the middle of the partition column is provided with a driving hole for driving the bidirectional screw rod to rotate.

[0011] Preferably, the palate base is provided with a third connecting rod at the left and right sides, the end of the third connecting rod, which is not connected to the palate base, is connected to the premolar rings, and not less than one spring is arranged on the third connecting rod.

[0012] Preferably, the molar band ring is provided with a fourth connecting rod on one side of the inner side of the dental arch, the fourth connecting rod is bent toward the upper jaw, an adjustment joint is provided at one end of the fourth connecting rod that is not connected to the molar band ring, a threaded hole is provided in the middle of the adjustment joint, and the adjustment screw is threadedly connected to the threaded hole.

[0013] Preferably, a connector is provided at one end of the adjusting screw, the connector is interference-connected with the bearing, and a driving groove is provided on a side of the connector facing the front end of the dental arch for driving the adjusting screw to rotate.

[0014] Preferably, the push rod includes a first support rod and a second support rod, the first support rod is provided with a guide rod at one end facing the second support rod, the second support rod is provided with a guide slot, the guide rod is inserted into the inner side of the guide slot, and a pressure spring is sleeved on the outer side of the guide rod, the pressure spring is provided with a pressure ring at one end facing the second support rod, and the pressure ring is pressed on the second support rod.

[0015] Preferably, it also includes an support nail, a plurality of countersunk holes are provided on the palatal base support, and a cone head is provided at one end of the support nail. The end of the support nail with the cone head passes through the countersunk hole and extends into the palatal base bone, so as to enhance the support stability of the palatal base support; the other end of the support nail is provided with a nail head for driving the support nail.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can apply a forward thrust to the human jaw by providing a jaw base and a third connecting rod, thereby promoting the development of the maxillary bone. At the same time, the push rod can apply a distal thrust to the molars to achieve the effect of molar distalization. The spiral expander can be used to correct the patient's dental arch. Through the cooperation of the three, three different parts can be treated at the same time, thereby greatly shortening the treatment cycle, and the effect of treating three parts at the same time is better.

[0017] 2. The present invention installs the push rod between the premolar and molar bands, preventing periodontal compression and tissue damage. The center of the jaw base fits snugly against the jaw, dispersing the vertical component of the frontal traction force and limiting clockwise rotation of the mandible. This structure reduces side effects.

[0018] 3. The present invention provides support nails which penetrate the palatal base support and are fixed to the palatal base bone, thereby enhancing the support stability of the device and reducing the deformation of the palatal base support. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 It is a schematic structural diagram of the dental arch of the present invention; Figure 3is a structural schematic view of the arch expander of the present application; Figure 4 is a structural schematic view of the molar band of the present application; Figure 5 is a structural schematic view of the adjusting screw of the present application; Figure 6 is a structural schematic view of the push rod of the present application; Figure 7 is a structural schematic view of the anchorage peg of the present application.

[0020] Fig. 1 is a dental arch; 11 is a premolar; 12 is a molar; 2 is an arch expander; 21 is a premolar band; 211 is a first mounting column; 212 is a first mounting slot; 22 is a traction hook; 23 is a first connecting rod; 24 is a second connecting rod; 25 is an adapter; 251 is a bearing; 26 is a guide rod; 27 is a bidirectional screw; 271 is a partition column; 272 is a driving hole; 28 is a jaw base; 281 is a counterbore; 29 is a third connecting rod; 291 is a spring curve; 3 is a molar band; 31 is a second mounting column; 32 is a second mounting slot; 33 is a fourth connecting rod; 34 is an adjusting joint; 35 is a threaded hole; 4 is an adjusting screw; 41 is a connecting head; 42 is a driving slot; 5 is a push rod; 51 is a first supporting rod; 511 is a guide plug; 512 is a pressure spring; 513 is a pressure ring; 52 is a second supporting rod; 521 is a guide slot; 6 is an anchorage peg; 61 is a peg head; 62 is a tapered head. DETAILED DESCRIPTION

[0021] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0022] The following will be further described in combination with the drawings and specific embodiments: Embodiment 1 As Figure 1 , Figure 2 and Figure 3As shown, an oral orthodontic device with the function of front traction and molar distalization includes a dental arch 1 and an expander 2. The expander 2 is convenient for expanding the patient's dental arch 1, thereby achieving the purpose of correcting the dental arch 1. The expander 2 is divided into two parts, left and right, and the left and right parts of the expander 2 are connected by a bidirectional screw 27 and a guide rod 26. The bidirectional screw 27 drives the two parts of the expander 2 to move outward at the same time, thereby achieving the purpose of expanding the patient's dental arch 1. This method is simple to adjust and convenient for medical staff to operate. Medical staff only need to use special tools to adjust the expander 2 for expansion; premolar bands 21 are provided on both sides of the expander 2, and the premolar bands 21 are sleeved on the premolars 11 of the dental arch 1, so that the expander 2 can apply an outward thrust to the dental arch 1. A molar band ring 3 is provided on the molar 12 of the dental arch 1, and a push rod 5 is provided between the molar band ring 3 and the premolar band ring 21. The push rod 5 applies a backward thrust to the molar band ring 3. The molar band ring 3 cooperates with the premolar band ring 21 and the push rod 5 to apply a backward thrust to the molar 12. The molar band ring 3 and the expander 2 are connected by an adjusting screw 4, which is used to apply a backward thrust to the molar 12 from the inside of the dental arch 1; a jaw base 28 is provided at the front end of the expander 2, the jaw base 28 fits the shape of the human jaw and applies a forward thrust to the human jaw, the jaw base 28 is made of medical silicone rubber or thermosetting resin material, and the inner wall of the jaw base 28 is provided with an arc-shaped fitting surface adapted to the shape of the human palate, and the surface of the arc-shaped fitting surface is provided with an anti-slip texture.

[0023] like Figure 3As shown, the front ends of both sides of the expander 2 and the two premolar bands 21 are connected by a first connecting rod 23, and the first connecting rod 23 is fixedly connected to the inner side of the premolar band 21; the fixed connection method is preferably integrally formed, or the first connecting rod 23 and the premolar band 21 are directly welded and polished during production. The first connecting rod 23 is bent toward the upper jaw and is used to fit the patient's upper jaw during installation. A second connecting rod 24 is provided at the rear end of both sides of the expander 2, and an adapter 25 is provided at the end of the second connecting rod 24. When the second connecting rod 24 is matched with the adapter 25, it is convenient to rotate and connect with the adjusting screw 4, which facilitates the use of the adjusting screw 4. A bearing 251 is provided in the middle of the adapter 25, and the end of the adjusting screw 4 is interference-connected with the bearing 251. By rotating the adjusting screw 4, a backward thrust is applied to the molar band 3, which facilitates the stability of the adjusting screw 4 and the rotation of the adjusting screw 4. The premolar band ring 21 is provided with a first mounting post 211 on one side of the outer side of the dental arch 1. The first mounting post 211 is provided with a first mounting groove 212 on the end facing the molar band ring 3. The molar band ring 3 is provided with a second mounting post 31 on the side of the outer side of the dental arch 1. The second mounting post 31 is provided with a second mounting groove 32 on the end facing the premolar band ring 21. The axes of the first mounting post 211 and the second mounting post 31 are collinear. The two ends of the push rod 5 are respectively inserted into the inner sides of the first mounting groove 212 and the second mounting groove 32. This structure facilitates the installation of the push rod 5 between the premolar band ring 21 and the molar band ring 3, thereby facilitating the application of a backward thrust to the molar band ring 3. The premolar band ring 21 is provided with a traction hook 22 facing the front end of the dental arch 1. The traction hook 22 is used to connect to an external traction device to apply a forward traction force, thereby promoting maxillary development, correcting maxillary retraction, and coordinating the relationship between the maxillary and mandibular bones. The expander 2 has a slit in the middle and two guide rods 26 symmetrically positioned in the fore-aft direction of the bidirectional screw 27. This structure of guide rods 26 provides stable guidance for the expander 2. A separator 271 is positioned along the bidirectional screw 27 in the slit. This separator 271 separates the two threads of the bidirectional screw 27, which have different orientations. Rotating the bidirectional screw 27 moves the left and right halves of the expander 2 closer together or further apart, facilitating adjustment of the left and right halves of the expander 2 to correct the patient's dental arch 1. A drive hole 272 is located in the middle of the separator 271, allowing staff to rotate the bidirectional screw 27. A third connecting rod 29 is provided on both sides of the jaw base 28, and the end of the third connecting rod 29 not connected to the jaw base 28 is connected to the premolar band ring 21, and at least one spring curve 291 is provided on the third connecting rod 29; this structure is convenient for applying a forward thrust to the patient's upper jaw through the third connecting rod 29 in conjunction with multiple spring curves 291, thereby achieving the purpose of corrective treatment for the patient.

[0024] like Figure 4As shown, a fourth connecting rod 33 is provided on one side of the molar band 3 disposed on the inner side of the dental arch 1. The fourth connecting rod 33 is bent toward the upper jaw, allowing the molar band 3 to better fit the patient's upper jaw when used with the arch expander 2. An adjustment joint 34 is provided on the end of the fourth connecting rod 33 not connected to the molar band 3. A threaded hole 35 is provided in the middle of the adjustment joint 34, and the adjustment screw 4 is threadedly connected to the threaded hole 35. This structure facilitates the connection between the fourth connecting rod 33 and the adjustment screw 4, and facilitates the application of a backward thrust to the molar band 3 through the adjustment screw 4.

[0025] like Figure 5 As shown, a connector 41 is provided at one end of the adjusting screw 4. The connector 41 is interference-fitted with the bearing 251, facilitating the rotation of the adjusting screw 4 and the application of thrust by the adjusting screw 4 to the molar band 3. A drive slot 42 is provided on the side of the connector 41 facing the front end of the dental arch 1 for driving the adjusting screw 4 to rotate.

[0026] like Figure 6 As shown, the push rod 5 includes a first support rod 51 and a second support rod 52. The first support rod 51 is provided with a guide rod 511 at one end facing the second support rod 52, and a guide slot 521 is provided on the second support rod 52. The guide rod 511 is inserted into the inner side of the guide slot 521, and a pressure spring 512 is sleeved on the outer side of the guide rod 511. The pressure spring 512 is provided with a pressure ring 513 at one end facing the second support rod 52, and the pressure ring 513 is pressed on the second support rod 52; the pressure spring 512 is in a contracted state, so that the pressure spring 512 can apply elastic force to the first support rod 51, so that the first support rod 51 can apply a backward thrust to the molar 12. This can provide a gap to relieve the problem of insufficient dental space in patients with Class III malocclusion and crowded teeth. By pushing the molar 12 distally, the length of the dental arch 1 can be increased to provide the necessary gap for the subsequent alignment of crowded teeth. At the same time, it can also prevent the maxillary molar 12 from moving forward due to maxillary anterior traction: when promoting maxillary bone development, anterior traction may be accompanied by a tendency for the maxillary molar 12 to shift forward, and applying a backward thrust to the molar 12 can offset this forward movement, ensure the stability of the molar 12 position, ensure that the effect of the anterior traction is not disturbed, and at the same time cooperate with the anterior traction component to achieve mechanical synergy and achieve the treatment goal of simultaneous interactive movement.

[0027] Example 2 like Figure 1 、 Figure 2 and Figure 3As shown, an oral orthodontic device with the function of front traction and molar distalization includes a dental arch 1 and an expander 2. The expander 2 is convenient for expanding the patient's dental arch 1, thereby achieving the purpose of correcting the dental arch 1. The expander 2 is divided into two parts, left and right, and the left and right parts of the expander 2 are connected by a bidirectional screw 27 and a guide rod 26. The bidirectional screw 27 drives the two parts of the expander 2 to move outward at the same time, thereby achieving the purpose of expanding the patient's dental arch 1. This method is simple to adjust and convenient for medical staff to operate. Medical staff only need to use special tools to adjust the expander 2 for expansion; premolar bands 21 are provided on both sides of the expander 2, and the premolar bands 21 are sleeved on the premolars 11 of the dental arch 1, so that the expander 2 can apply an outward thrust to the dental arch 1. A molar band ring 3 is provided on the molar 12 of the dental arch 1, and a push rod 5 is provided between the molar band ring 3 and the premolar band ring 21. The push rod 5 applies a backward thrust to the molar band ring 3. The molar band ring 3 cooperates with the premolar band ring 21 and the push rod 5 to apply a backward thrust to the molar 12. The molar band ring 3 and the expander 2 are connected by an adjusting screw 4, which is used to apply a backward thrust to the molar 12 from the inside of the dental arch 1; a jaw base 28 is provided at the front end of the expander 2, the jaw base 28 fits the shape of the human jaw and applies a forward thrust to the human jaw, the jaw base 28 is made of medical silicone rubber or thermosetting resin material, and the inner wall of the jaw base 28 is provided with an arc-shaped fitting surface adapted to the shape of the human palate, and the surface of the arc-shaped fitting surface is provided with an anti-slip texture.

[0028] like Figure 3As shown, the front ends of both sides of the expander 2 and the two premolar bands 21 are connected by a first connecting rod 23, and the first connecting rod 23 is fixedly connected to the inner side of the premolar band 21; the fixed connection method is preferably integrally formed, or the first connecting rod 23 and the premolar band 21 are directly welded and polished during production. The first connecting rod 23 is bent toward the upper jaw and is used to fit the patient's upper jaw during installation. A second connecting rod 24 is provided at the rear end of both sides of the expander 2, and an adapter 25 is provided at the end of the second connecting rod 24. When the second connecting rod 24 is matched with the adapter 25, it is convenient to rotate and connect with the adjusting screw 4, which facilitates the use of the adjusting screw 4. A bearing 251 is provided in the middle of the adapter 25, and the end of the adjusting screw 4 is interference-connected with the bearing 251. By rotating the adjusting screw 4, a backward thrust is applied to the molar band 3, which facilitates the stability of the adjusting screw 4 and the rotation of the adjusting screw 4. The premolar band ring 21 is provided with a first mounting post 211 on one side of the outer side of the dental arch 1. The first mounting post 211 is provided with a first mounting groove 212 on the end facing the molar band ring 3. The molar band ring 3 is provided with a second mounting post 31 on the side of the outer side of the dental arch 1. The second mounting post 31 is provided with a second mounting groove 32 on the end facing the premolar band ring 21. The axes of the first mounting post 211 and the second mounting post 31 are collinear. The two ends of the push rod 5 are respectively inserted into the inner sides of the first mounting groove 212 and the second mounting groove 32. This structure facilitates the installation of the push rod 5 between the premolar band ring 21 and the molar band ring 3, thereby facilitating the application of a backward thrust to the molar band ring 3. The premolar band ring 21 is provided with a traction hook 22 facing the front end of the dental arch 1. The traction hook 22 is used to connect to an external traction device to apply a forward traction force, thereby promoting maxillary development, correcting maxillary retraction, and coordinating the relationship between the maxillary and mandibular bones. The expander 2 has a slit in the middle and two guide rods 26 symmetrically positioned in the fore-aft direction of the bidirectional screw 27. This structure of guide rods 26 provides stable guidance for the expander 2. A separator 271 is positioned along the bidirectional screw 27 in the slit. This separator 271 separates the two threads of the bidirectional screw 27, which have different orientations. Rotating the bidirectional screw 27 moves the left and right halves of the expander 2 closer together or further apart, facilitating adjustment of the left and right halves of the expander 2 to correct the patient's dental arch 1. A drive hole 272 is located in the middle of the separator 271, allowing staff to rotate the bidirectional screw 27. A third connecting rod 29 is provided on both sides of the jaw base 28, and the end of the third connecting rod 29 not connected to the jaw base 28 is connected to the premolar band ring 21, and at least one spring curve 291 is provided on the third connecting rod 29; this structure is convenient for applying a forward thrust to the patient's upper jaw through the third connecting rod 29 in conjunction with multiple spring curves 291, thereby achieving the purpose of corrective treatment for the patient.

[0029] like Figure 4As shown, a fourth connecting rod 33 is provided on one side of the molar band 3 disposed on the inner side of the dental arch 1. The fourth connecting rod 33 is bent toward the upper jaw, allowing the molar band 3 to better fit the patient's upper jaw when used with the arch expander 2. An adjustment joint 34 is provided on the end of the fourth connecting rod 33 not connected to the molar band 3. A threaded hole 35 is provided in the middle of the adjustment joint 34, and the adjustment screw 4 is threadedly connected to the threaded hole 35. This structure facilitates the connection between the fourth connecting rod 33 and the adjustment screw 4, and facilitates the application of a backward thrust to the molar band 3 through the adjustment screw 4.

[0030] like Figure 5 As shown, a connector 41 is provided at one end of the adjusting screw 4. The connector 41 is interference-fitted with the bearing 251, facilitating the rotation of the adjusting screw 4 and the application of thrust by the adjusting screw 4 to the molar band 3. A drive slot 42 is provided on the side of the connector 41 facing the front end of the dental arch 1 for driving the adjusting screw 4 to rotate.

[0031] like Figure 6 As shown, the push rod 5 includes a first support rod 51 and a second support rod 52. The first support rod 51 is provided with a guide rod 511 at one end facing the second support rod 52, and a guide slot 521 is provided on the second support rod 52. The guide rod 511 is inserted into the inner side of the guide slot 521, and a pressure spring 512 is sleeved on the outer side of the guide rod 511. The pressure spring 512 is provided with a pressure ring 513 at one end facing the second support rod 52, and the pressure ring 513 is pressed on the second support rod 52; the pressure spring 512 is in a contracted state, so that the pressure spring 512 can apply elastic force to the first support rod 51, so that the first support rod 51 can apply a backward thrust to the molar 12. This can provide a gap to relieve the problem of insufficient dental space in patients with Class III malocclusion and crowded teeth. By pushing the molar 12 distally, the length of the dental arch 1 can be increased to provide the necessary gap for the subsequent alignment of crowded teeth. At the same time, it can also prevent the maxillary molar 12 from moving forward due to maxillary anterior traction: when promoting maxillary bone development, anterior traction may be accompanied by a tendency for the maxillary molar 12 to shift forward, and applying a backward thrust to the molar 12 can offset this forward movement, ensure the stability of the molar 12 position, ensure that the effect of the anterior traction is not disturbed, and at the same time cooperate with the anterior traction component to achieve mechanical synergy and achieve the treatment goal of simultaneous interactive movement.

[0032] like Figure 7As shown, it also includes an support nail 6, a plurality of countersunk holes 281 are provided on the jaw base 28, and a cone head 62 is provided at one end of the support nail 6. The end of the support nail 6 with the cone head 62 passes through the countersunk hole 281 and extends into the palatal base bone, which is used to enhance the support stability of the palatal base; the other end of the support nail 6 is provided with a nail head 61, which is used to drive the support nail 6; the support nail 6 is fixedly connected to the bone to provide a more stable support foundation for the entire device, reduce the deformation or displacement of the jaw base 28 during the force process, thereby ensuring that the expander 2, the push rod 5 and the adjusting screw 4 can stably apply the predetermined thrust, improve the accuracy and reliability of the treatment effect, and reduce problems such as correction force dispersion or treatment deviation caused by insufficient support.

[0033] Example 3 like Figure 1 、 Figure 2 and Figure 3 As shown, an oral orthodontic device with the function of front traction and molar distalization includes a dental arch 1 and an expander 2. The expander 2 is convenient for expanding the patient's dental arch 1, thereby achieving the purpose of correcting the dental arch 1. The expander 2 is divided into two parts, left and right, and the left and right parts of the expander 2 are connected by a bidirectional screw 27 and a guide rod 26. The bidirectional screw 27 drives the two parts of the expander 2 to move outward at the same time, thereby achieving the purpose of expanding the patient's dental arch 1. This method is simple to adjust and convenient for medical staff to operate. Medical staff only need to use special tools to adjust the expander 2 for expansion; premolar bands 21 are provided on both sides of the expander 2, and the premolar bands 21 are sleeved on the premolars 11 of the dental arch 1, so that the expander 2 can apply an outward thrust to the dental arch 1. A molar band ring 3 is provided on the molar 12 of the dental arch 1, and a push rod 5 is provided between the molar band ring 3 and the premolar band ring 21. The push rod 5 applies a backward thrust to the molar band ring 3. The molar band ring 3 cooperates with the premolar band ring 21 and the push rod 5 to apply a backward thrust to the molar 12. The molar band ring 3 and the expander 2 are connected by an adjusting screw 4, which is used to apply a backward thrust to the molar 12 from the inside of the dental arch 1; a jaw base 28 is provided at the front end of the expander 2, the jaw base 28 fits the shape of the human jaw and applies a forward thrust to the human jaw, the jaw base 28 is made of medical silicone rubber or thermosetting resin material, and the inner wall of the jaw base 28 is provided with an arc-shaped fitting surface adapted to the shape of the human palate, and the surface of the arc-shaped fitting surface is provided with an anti-slip texture.

[0034] like Figure 3As shown, the front ends of both sides of the expander 2 and the two premolar bands 21 are connected by a first connecting rod 23, and the first connecting rod 23 is fixedly connected to the inner side of the premolar band 21; the fixed connection method is preferably integrally formed, or the first connecting rod 23 and the premolar band 21 are directly welded and polished during production. The first connecting rod 23 is bent toward the upper jaw and is used to fit the patient's upper jaw during installation. A second connecting rod 24 is provided at the rear end of both sides of the expander 2, and an adapter 25 is provided at the end of the second connecting rod 24. When the second connecting rod 24 is matched with the adapter 25, it is convenient to rotate and connect with the adjusting screw 4, which facilitates the use of the adjusting screw 4. A bearing 251 is provided in the middle of the adapter 25, and the end of the adjusting screw 4 is interference-connected with the bearing 251. By rotating the adjusting screw 4, a backward thrust is applied to the molar band 3, which facilitates the stability of the adjusting screw 4 and the rotation of the adjusting screw 4. The premolar band ring 21 is provided with a first mounting post 211 on one side of the outer side of the dental arch 1. The first mounting post 211 is provided with a first mounting groove 212 on the end facing the molar band ring 3. The molar band ring 3 is provided with a second mounting post 31 on the side of the outer side of the dental arch 1. The second mounting post 31 is provided with a second mounting groove 32 on the end facing the premolar band ring 21. The axes of the first mounting post 211 and the second mounting post 31 are collinear. The two ends of the push rod 5 are respectively inserted into the inner sides of the first mounting groove 212 and the second mounting groove 32. This structure facilitates the installation of the push rod 5 between the premolar band ring 21 and the molar band ring 3, thereby facilitating the application of a backward thrust to the molar band ring 3. The premolar band ring 21 is provided with a traction hook 22 facing the front end of the dental arch 1. The traction hook 22 is used to connect to an external traction device to apply a forward traction force, thereby promoting maxillary development, correcting maxillary retraction, and coordinating the relationship between the maxillary and mandibular bones. The expander 2 has a slit in the middle and two guide rods 26 symmetrically positioned in the fore-aft direction of the bidirectional screw 27. This structure of guide rods 26 provides stable guidance for the expander 2. A separator 271 is positioned along the bidirectional screw 27 in the slit. This separator 271 separates the two threads of the bidirectional screw 27, which have different orientations. Rotating the bidirectional screw 27 moves the left and right halves of the expander 2 closer together or further apart, facilitating adjustment of the left and right halves of the expander 2 to correct the patient's dental arch 1. A drive hole 272 is located in the middle of the separator 271, allowing staff to rotate the bidirectional screw 27. A third connecting rod 29 is provided on both sides of the jaw base 28, and the end of the third connecting rod 29 not connected to the jaw base 28 is connected to the premolar band ring 21, and at least one spring curve 291 is provided on the third connecting rod 29; this structure is convenient for applying a forward thrust to the patient's upper jaw through the third connecting rod 29 in conjunction with multiple spring curves 291, thereby achieving the purpose of corrective treatment for the patient.

[0035] like Figure 4As shown, a fourth connecting rod 33 is provided on one side of the molar band 3 disposed on the inner side of the dental arch 1. The fourth connecting rod 33 is bent toward the upper jaw, allowing the molar band 3 to better fit the patient's upper jaw when used with the arch expander 2. An adjustment joint 34 is provided on the end of the fourth connecting rod 33 not connected to the molar band 3. A threaded hole 35 is provided in the middle of the adjustment joint 34, and the adjustment screw 4 is threadedly connected to the threaded hole 35. This structure facilitates the connection between the fourth connecting rod 33 and the adjustment screw 4, and facilitates the application of a backward thrust to the molar band 3 through the adjustment screw 4.

[0036] like Figure 5 As shown, a connector 41 is provided at one end of the adjusting screw 4. The connector 41 is interference-fitted with the bearing 251, facilitating the rotation of the adjusting screw 4 and the application of thrust by the adjusting screw 4 to the molar band 3. A drive slot 42 is provided on the side of the connector 41 facing the front end of the dental arch 1 for driving the adjusting screw 4 to rotate.

[0037] like Figure 6 As shown, the push rod 5 includes a first support rod 51 and a second support rod 52. The first support rod 51 is provided with a guide rod 511 at one end facing the second support rod 52, and a guide slot 521 is provided on the second support rod 52. The guide rod 511 is inserted into the inner side of the guide slot 521, and a pressure spring 512 is sleeved on the outer side of the guide rod 511. The pressure spring 512 is provided with a pressure ring 513 at one end facing the second support rod 52, and the pressure ring 513 is pressed on the second support rod 52; the pressure spring 512 is in a contracted state, so that the pressure spring 512 can apply elastic force to the first support rod 51, so that the first support rod 51 can apply a backward thrust to the molar 12. This can provide a gap to relieve the problem of insufficient dental space in patients with Class III malocclusion and crowded teeth. By pushing the molar 12 distally, the length of the dental arch 1 can be increased to provide the necessary gap for the subsequent alignment of crowded teeth. At the same time, it can also prevent the maxillary molar 12 from moving forward due to maxillary anterior traction: when promoting maxillary bone development, anterior traction may be accompanied by a tendency for the maxillary molar 12 to shift forward, and applying a backward thrust to the molar 12 can offset this forward movement, ensure the stability of the molar 12 position, ensure that the effect of the anterior traction is not disturbed, and at the same time cooperate with the anterior traction component to achieve mechanical synergy and achieve the treatment goal of simultaneous interactive movement.

[0038] like Figure 7As shown, it also includes an support nail 6, a plurality of countersunk holes 281 are provided on the jaw base 28, and a cone head 62 is provided at one end of the support nail 6. The end of the support nail 6 with the cone head 62 passes through the countersunk hole 281 and extends into the palatal base bone, which is used to enhance the support stability of the palatal base; the other end of the support nail 6 is provided with a nail head 61, which is used to drive the support nail 6; the support nail 6 is fixedly connected to the bone to provide a more stable support foundation for the entire device, reduce the deformation or displacement of the jaw base 28 during the force process, thereby ensuring that the expander 2, the push rod 5 and the adjusting screw 4 can stably apply the predetermined thrust, improve the accuracy and reliability of the treatment effect, and reduce problems such as correction force dispersion or treatment deviation caused by insufficient support.

[0039] like Figure 3 、 Figure 5 and Figure 6 As shown, positioning marks are provided on the push rod 5 and the adjusting screw 4, and the positioning marks are fluorescent coatings for indicating the contact position between the push rod and the molar 12. The first connecting rod 23, the second connecting rod 24, the third connecting rod 29 and the fourth connecting rod 33 are all made of nickel-titanium alloy or stainless steel.

[0040] Working principle: The expander 2 is a core adjustment component, which is divided into two parts, left and right, and is connected by a bidirectional screw 27 and a guide rod 26. When the medical staff rotates the bidirectional screw 27 with the help of a special tool, the left and right parts can be driven to move outward at the same time, and combined with the premolar band ring 21 sleeved on the premolar 11, an outward thrust is applied to the dental arch 1, thereby achieving expansion of the dental arch 1; the premolar band ring 21 and the molar band ring 3 sleeved on the molar 12 are connected by a push rod 5, which is composed of a first support rod 51, a second support rod 52, a guide insert rod 511 and a pressure spring 512 in a contracted state. The pressure spring 512 applies elastic force to the second support rod 52 through the pressure ring 513, prompting the push rod 5 to continuously apply a backward thrust to the molar band ring 3. At the same time, the second connecting rods 24 at the rear ends of the two sides of the expander 2 are rotatably connected to the adjusting screw 4 through the bearing 251 of the adapter 25. Rotating the adjusting screw 4 can further apply a backward thrust to the molar band ring 3 from the inside of the dental arch 1. The force is applied to the jaw by the spring 291 on the third connecting rod 29, and the traction hook 22 of the premolar band ring 21 is connected to the external traction device to jointly promote the development of the maxillary bone, correct the retraction of the maxillary bone, and coordinate the relationship between the maxillary and mandibular bones. In addition, the anchor pin 6 is fixed to the palatal base bone through the countersunk hole 281 of the jaw base 28 to enhance the overall stability of the device. The first, second, third and fourth connecting rods are made of nickel-titanium alloy or stainless steel and fit the shape of the maxillary bone to ensure stable force of each component. The fluorescent positioning marks on the push rod 5 and the adjusting screw 4 can indicate the contact position with the molar 12 to ensure the accuracy of correction.

[0041] To sum up, compared with the existing technology, the present application can apply a thrust to the human jaw forward by setting the jaw base 28 and the third connecting rod, which can promote the development of the maxillary bone. At the same time, the push rod 5 can apply a thrust in the distal direction to the molar 12 to achieve the effect of distal movement of the molar 12. The spiral expander 2 can be used to correct the patient's dental arch 1; through the cooperation of the three, the treatment of three different parts can be achieved at the same time, thereby greatly shortening the treatment cycle, and the effect of treating three parts at the same time is better.

[0042] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An orthodontic device with forward traction and molar distalization functions, comprising a dental arch (1) and an arch expander (2), characterized in that: The expander (2) is divided into two parts, the left and right parts of the expander (2), and the left and right parts of the expander (2) are connected by a bidirectional screw (27) and a guide rod (26). The bidirectional screw (27) drives the two parts of the expander (2) to move outward at the same time, thereby achieving the purpose of expanding the patient's dental arch (1); the left and right sides of the expander (2) are both provided with premolar bands (21), the premolar bands (21) are sleeved on the premolars (11) of the dental arch (1), and the molars (12) of the dental arch (1) are sleeved on the molars (12) of the dental arch (1). The sleeve is provided with a molar band ring (3), a push rod (5) is provided between the molar band ring (3) and the premolar band ring (21), and the push rod (5) applies a backward thrust to the molar band ring (3). The molar band ring (3) and the arch expander (2) are connected via an adjusting screw (4) and are used to apply a backward thrust to the molar (12) from the inner side of the dental arch (1); a jaw base (28) is provided at the front end of the arch expander (2), and the jaw base (28) fits the shape of the human jaw and applies a forward thrust to the human jaw.

2. The orthodontic device with forward traction and molar distalization function according to claim 1, characterized in that: The front ends of both sides of the expander (2) and the two premolar band rings (21) are connected via a first connecting rod (23), and the first connecting rod (23) is fixedly connected to the inner side of the premolar band ring (21); the first connecting rod (23) is bent toward the upper jaw and is used to fit the patient's upper jaw during installation.

3. The orthodontic device with forward traction and molar distalization functions according to claim 2, characterized in that: The rear ends of both sides of the expander (2) are provided with second connecting rods (24), the ends of the second connecting rods (24) are provided with adapters (25), the middle of the adapters (25) is provided with bearings (251), the ends of the adjusting screws (4) are interference-connected with the bearings (251), and a backward thrust is applied to the molar band ring (3) by rotating the adjusting screws (4).

4. The orthodontic device with forward traction and molar distalization functions according to claim 1, characterized in that: The premolar band ring (21) is provided with a first mounting post (211) on one side of the outer side of the dental arch (1), and a first mounting groove (212) is provided on one end of the first mounting post (211) facing the molar band ring (3). The molar band ring (3) is provided with a second mounting post (31) on one side of the outer side of the dental arch (1), and a second mounting groove (32) is provided on one end of the second mounting post (31) facing the premolar band ring (21). The axes of the first mounting post (211) and the second mounting post (31) are on the same straight line, and the two ends of the push rod (5) are respectively inserted into the inner sides of the first mounting groove (212) and the second mounting groove (32); the premolar band ring (21) is provided with a traction hook (22) in the direction toward the front end of the dental arch (1).

5. The orthodontic device with forward traction and molar distalization functions according to claim 1, characterized in that: A gap is provided in the middle of the expander (2), and two guide rods (26) are provided. The two guide rods (26) are symmetrically arranged in the front and rear directions of the bidirectional screw (27); a partition column (271) is provided in the gap of the expander (2) along the bidirectional screw (27), and the partition column (271) is used to separate the two threads in different directions on the bidirectional screw (27). The rotation of the bidirectional screw (27) can drive the left and right parts of the expander (2) to move closer to or away from each other; a driving hole (272) is provided in the middle of the partition column (271) for the staff to drive the bidirectional screw (27) to rotate.

6. The orthodontic device with forward traction and molar distalization functions according to claim 5, characterized in that: A third connecting rod (29) is provided on both sides of the jaw base (28), and the end of the third connecting rod (29) not connected to the jaw base (28) is connected to the premolar band ring (21), and at least one spring curve (291) is provided on the third connecting rod (29).

7. The orthodontic device with forward traction and molar distalization functions according to claim 1, characterized in that: The molar band ring (3) is provided with a fourth connecting rod (33) on one side of the inner side of the dental arch (1), and the fourth connecting rod (33) is bent toward the upper jaw. An adjustment joint (34) is provided at one end of the molar band ring (3), and a threaded hole (35) is provided in the middle of the adjustment joint (34). The adjustment screw (4) is threadedly connected to the threaded hole (35).

8. The orthodontic device with forward traction and molar distalization functions according to claim 3, characterized in that: A connector (41) is provided at one end of the adjusting screw (4), the connector (41) is interference-connected with the bearing (251), and a driving groove (42) is provided on a side of the connector (41) facing the front end of the dental arch (1) for driving the adjusting screw (4) to rotate.

9. The orthodontic device with forward traction and molar distalization functions according to claim 1, characterized in that: The push rod (5) comprises a first support rod (51) and a second support rod (52), wherein the first support rod (51) is provided with a guide rod (511) at one end thereof facing the second support rod (52), and the second support rod (52) is provided with a guide slot (521), wherein the guide rod (511) is inserted into the inner side of the guide slot (521), and a pressure spring (512) is sleeved on the outer side of the guide rod (511), and the pressure spring (512) is provided with a pressure ring (513) at one end thereof facing the second support rod (52), and the pressure ring (513) is pressed on the second support rod (52).

10. An orthodontic device with forward traction and molar distalization functions according to any one of claims 1 to 9, characterized in that: It also includes an anchoring nail (6), wherein the palatal base support (28) is provided with a plurality of countersunk holes (281), one end of the anchoring nail (6) is provided with a cone head (62), and one end of the anchoring nail (6) provided with the cone head (62) passes through the countersunk hole (281) and extends into the palatal base bone, so as to enhance the anchoring stability of the palatal base support; the other end of the anchoring nail (6) is provided with a nail head (61) for driving the anchoring nail (6).

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