Adjustable molar distalization means and palatal expander having same

Abstract

The present invention relates to a palatal expander equipped with a molar distalization means for expansion of the maxillary bone and distal retrusion of the maxillary molars. In particular, the present invention is configured such that molar distal retrusion is possible during a maintenance period of three to four months after expansion of the maxillary bone, the distalization means can be easily mounted on the palatal expander through assembly without silver soldering or laser welding, and same can be easily connected after adjustment according to the height differences of the molars of patients.

Description

Adjustable posterior molar movement device and palatal expansion device with the same

[0001] The present invention relates to a molar posterior movement means for expansion of the maxilla and posterior distal movement of the maxillary molars, and a palatal expansion device having the same, wherein posterior distal movement of the molars is possible during a maintenance period of 3 to 4 months after expansion of the maxilla, and the movement means can be easily assembled and attached to the oral expansion device without silver soldering or laser welding, and is configured to be easily height-adjusted and connected according to the height of the palatal roof and the height difference of the root furrow according to the palatal incline, which are different for each patient, and in particular, an elastic body for posterior distal movement of the premolars after posterior distal movement of the molars is configured to be easily attached.

[0002]

[0003] Reference to related applications

[0004] This application claims priority to Republic of Korea Patent Application No. 10-2024-0083732, filed June 26, 2024, the entire contents of which are incorporated herein by reference.

[0005] Meanwhile, the present invention was made possible with the support of the following in-hospital research project under the supervision of Seoul National University Bundang Hospital.

[0006] [In-house research project supporting this invention]

[0007] [MSRI Project Number] 14-2017-0014

[0008] [Research Management Specialist Organization] Seoul National University Bundang Hospital

[0009] [Project Title] A Study on Skeletal and Dental Changes (Expansion and Retraction) Using a Miniscrew-Supported Palate Expander and Its Modified Device

[0010] [Contribution rate] 100%

[0011] [Host] Seoul National University Bundang Hospital

[0012] [Research Period] June 1, 2017 - May 31, 2024

[0013]

[0014] Orthodontics is a field of dentistry that corrects the teeth by moving teeth to treat malocclusions such as occlusal abnormalities caused by skeletal disharmony between the upper and lower jaws, a narrowing of the upper jaw compared to the lower jaw arch, unaesthetic facial phenomena (such as protrusion), and increased vertical fixation of the face due to molar extrusion.

[0015] Normally, the human jaw is composed of the maxilla (upper jaw) and the mandible (lower jaw), and the maxillary and mandibular teeth are formed on the upper and lower sides, respectively, and the maxillary and mandibular teeth occlude with each other according to the movement of the temporomandibular joint, creating a structure that allows for chewing food.

[0016] When examining the maxilla of a patient with malocclusion, the maxilla may be positioned anteriorly compared to the mandible, indicating a Class II malocclusion with prognathism / buck teeth, or the maxillary arch may be narrower than the mandibular arch, indicating a crossbite of the maxillary molars (posterior teeth).

[0017] In cases where the maxillary arch is narrow, an expansion attempt is made by opening the midpalatal suture of the maxilla using an expander (Maxillary arch expander), and in cases of protruding maxillary teeth, it is necessary to move the entire maxillary teeth, including the maxillary molars (posterior teeth), posteriorly.

[0018] To this end, an expander is conventionally installed to expand the maxilla to the left and right, and after a maintenance period of approximately 3 to 4 months during which bone formation occurs in the sutured area while the maxilla is expanded, the expander is removed, and a separate moving device is installed to move the molars posteriorly and distally.

[0019] Therefore, patients with Class II malocclusion, in which the maxilla / maxillary arch is narrow and protrudes or the molars are moved forward, must receive long-term treatment during the expansion period, maintenance period, molar movement period, and premolar movement period, and there is inconvenience due to device replacement, and the medical staff must perform molar and premolar movement treatment in stages after the expansion period and maintenance period, which requires a lot of time and manpower for treatment.

[0020] The present invention was invented to solve the problems of the prior art as described above, and its purpose is to provide an adjustable molar rearward movement means configured to centrifugally move molars and premolars backward during a period of expanding and maintaining the maxilla using a palatal expander, and a palatal expander having the same.

[0021] In addition, the present invention aims to provide a palatal expansion device configured so that a moving means for moving molars and premolars backwards can be easily mounted on a palatal expansion device, and the height of the moving means can be easily adjusted according to the difference in the height of the root furrow of the molar portion of each patient, so that it can be connected to the molar portion.

[0022] In addition, the present invention aims to provide an adjustable molar rearward movement means configured to easily mount and detach an elastic body for rearwardly moving a premolar after rearwardly moving a molar, and a palatal expansion device including the same.

[0023] In order to achieve the above object, the palatal expander according to the present invention is characterized by including an expander having arms extending to molars and premolars respectively and moving the maxilla in the width direction while supporting the molars and premolars, a moving means mounted on the arms of the expander and capable of moving in the longitudinal direction of the arms, providing an elastic force for pushing the molars backward, and an elastic body hanging part formed on the moving means so as to be able to connect an elastic body for moving the premolars backward after moving the molars backward.

[0024] In addition, according to a preferred embodiment of the present invention, the expander includes an expander positioned between the two molar teeth and extendable in the left and right directions, a plurality of arms extending from the expander to the molar teeth, bands each having arms connected to surround premolars and molars, and an auxiliary wire connecting the premolars bands surrounding the premolars and the molars bands surrounding the molars.

[0025] In addition, according to a preferred embodiment of the present invention, the expansion member includes a pair of split bodies that are fixed to the maxilla by screws, and the pair of split bodies are extended while moving in the left and right directions respectively where the molars on both sides are located, and each split body is formed with a front arm connected to a premolar band and a rear arm connected to a molar band.

[0026] In addition, according to a preferred embodiment of the present invention, the expansion member includes a pair of split bodies positioned between the molar portions on both sides, the pair of split bodies extending while moving in the left and right directions where the molar portions on both sides are positioned, and each split body is formed with a front arm connected to a premolar band and a rear arm connected to a molar band.

[0027] In addition, according to a preferred embodiment of the present invention, the moving means includes a wire, a coil spring wrapping the wire, and a slide tube that is in contact with an end of the coil spring and through which the wire passes so as to be movable in the longitudinal direction of the wire.

[0028] In addition, according to a preferred embodiment of the present invention, the tip of the wire is fixed to the front arm, the slide tube is fixed to the molar band, and when the auxiliary wire is cut, the coil spring provides an elastic force to move the molar band backward and centrifugally.

[0029] In addition, according to a preferred embodiment of the present invention, the moving means further includes a stopper that is in contact with an end of the coil spring and is fixed at one point along the length of the wire, and adjusts the elasticity of the coil spring according to the gap between the stopper and the slide tube.

[0030] Additionally, according to a preferred embodiment of the present invention, a lever arm is formed along the palatal slope of the slide tube, and the lever arm is fixed to the molar band.

[0031] Additionally, according to a preferred embodiment of the present invention, the lever arm is formed with an elastic body hook portion that secures one end of the elastic body.

[0032] Additionally, according to a preferred embodiment of the present invention, the elastic body hook formed on the lever arm is formed toward the rear.

[0033] Additionally, according to a preferred embodiment of the present invention, the lever arm is formed with one to three elastic hooks.

[0034] In addition, according to a preferred embodiment of the present invention, the elastic body is a rubber band, one end of the rubber band is fixed by hanging it on an elastic body hook, and the other end of the rubber band is fixed by hanging it on the remaining part from which the arm connected to the premolar band is cut.

[0035] In addition, according to a preferred embodiment of the present invention, a pressurizing portion is formed at the tip of the wire of the moving means, a hole is formed in the pressurizing portion through which the front arm passes, and the pressurizing portion is fixed to a point of the front arm as it is plastically deformed by pressing the pressurizing portion.

[0036] In addition, according to a preferred embodiment of the present invention, a tab is formed in the stopper, and the wire can be pressurized and fixed by tightening a bolt fastened to the tab, or the stopper can be moved along the wire by loosening the bolt.

[0037] In addition, the molar rearward movement means according to the present invention is characterized by including a pressure part having a widthwise hole formed therein so that an arm extended from a palatal expander passes through it, a wire extending outwardly from the pressure part, a slide tube through which the wire passes and which is movable in the longitudinal direction of the wire, a lever arm extending outwardly from the slide tube and fixed to a molar band, and a spring located between the pressure part and the slide tube and providing elasticity in a direction that pushes the slide tube.

[0038] Additionally, according to a preferred embodiment of the present invention, a cut is formed in the width direction along the rock hole in the pressurized portion.

[0039] As explained above, in the past, the maxilla was expanded, and after a retention period of 3 to 4 months, the palatal expander was removed, and a separate molar rearward movement device, a distalizer, was installed to move the molars backwards and centrifugally. However, the palatal expander according to the present invention can expand the maxilla and move the molars and premolars backwards and centrifugally during a retention period of 3 to 4 months, which has the advantage of reducing patient discomfort and medical staff manpower.

[0040] In addition, in the past, there was the inconvenience of having to install the corresponding device for each patient for each time the maxillary bone was expanded and the molars were moved posteriorly, but the palatal expansion device according to the present invention is configured with an expander and a moving means together, so that by installing the palatal expansion device according to the present invention once on a patient, treatment can proceed simultaneously for maxillary bone expansion and posterior distal movement of the large and small molars.

[0041] In addition, the palatal expander according to the present invention has a distalizer, which is a moving means, that can move along a front arm extended from the main body of the expander, and by forcibly picking up and fixing the distalizer at an appropriate position, the position of the distalizer can be easily set and fixed in consideration of the height difference of the root furrow of the molar part according to the height of the palatal roof and the angle of the palatal slope, which are different for each patient. Therefore, unlike conventional methods, silver soldering or laser welding is not required, so there is an advantage in that the distalizer is easy to fix.

[0042] In addition, the palatal expander according to the present invention, when it is desired to move a premolar backward after moving a molar backward, can be configured to cut the front arm so that a remainder remains, and connect the remaining remainder to the elastic hook of the lever arm with an elastic rubber band so that the premolar moves backward toward the molar. In this way, after moving a molar backward, the premolar can also be easily moved backward simply by cutting the front arm and attaching an elastic body.

[0043] Figure 1 is a conceptual diagram showing the existing RPE (rapid palatal expander).

[0044] Figure 2 is a conceptual diagram showing the existing MARPE (miniscrew assisted RPE).

[0045] Figure 3 is a perspective view showing a palatal expansion device equipped with an adjustable molar rearward movement means according to the present invention.

[0046] Figure 4a is a detailed drawing showing the adjustable rearward movement means shown in Figure 3.

[0047] Figure 4b is a longitudinal cross-sectional view showing the state in which the adjustable molar rear movement means illustrated in Figure 4a is connected to the front arm.

[0048] Figure 5 is a conceptual diagram showing a state in which a palatal expansion device equipped with a posterior molar movement means according to the present invention is connected to a molar band.

[0049] Figure 6 is a conceptual diagram showing an example in which the palatal expander shown in Figure 5 is mounted on the maxilla and molars, and the rear movement means is clamped and fixed to the front arm.

[0050] Figure 7 is a conceptual diagram showing an example of adjusting the height of the rear moving means according to the height difference of the root branch.

[0051] Figure 8 is a conceptual diagram showing the expanded state of the maxilla.

[0052] Figure 9 is a conceptual diagram showing the state of moving the molars posteriorly while the maxilla is expanded.

[0053] Figure 10 is a conceptual diagram showing a state in which a pressurizing means is installed to move a premolars backwards and backwards after moving a molar backwards and backwards.

[0054] Figure 11 is a conceptual diagram showing a modified example of the palatal expander shown in Figure 5.

[0055] Figure 12 is a conceptual diagram showing a stopper with a lock.

[0056] In this specification, the term "patient" is not necessarily limited to a literal patient, and is not particularly limited to any subject to which the adjustable molar retraction device and the palatal expander combined therewith can be applied. For example, a subject that is not an actual patient but acts as a patient, such as a case of practicing using the adjustable molar retraction device and the palatal expander combined therewith according to the present invention, is also included within the meaning of "patient," and it will be understood that the scope of the present invention is not necessarily limited to a literal patient.

[0057] Below, a preferred embodiment of an adjustable molar posterior movement means and a palatal expansion device including the same according to the present invention will be described in detail with reference to the attached drawings.

[0058] In the drawings, FIG. 1 is a conceptual diagram showing a conventional rapid palatal expander (RPE), and FIG. 2 is a conceptual diagram showing a conventional miniscrew assisted RPE (MARPE). FIG. 3 is a perspective view showing a palatal expander equipped with an adjustable molar posterior movement means according to the present invention, and FIG. 4a is a detailed diagram showing the adjustable molar posterior movement means shown in FIG. 3, and FIG. 4b is a longitudinal cross-sectional view showing a state in which the adjustable molar posterior movement means shown in FIG. 4a is coupled to a front arm, and FIG. 5 is a conceptual diagram showing a state in which a palatal expander equipped with a molar posterior movement means according to the present invention is connected to a molar band, and FIG. 6 is a conceptual diagram showing an example in which the palatal expander shown in FIG. 5 is mounted on the maxilla and molar region and the posterior movement means is clamped and fixed to the front arm.

[0059] Also, Fig. 7 is a conceptual diagram showing an example of adjusting the height of a rearward movement means according to the height difference of the root furrow, Fig. 8 is a conceptual diagram showing a state in which the maxilla is expanded, Fig. 9 is a conceptual diagram showing a state in which a molar is moved backward and centrifugally in a state in which the maxilla is expanded, and Fig. 10 is a conceptual diagram showing a state in which a pressurizing means is installed to move a premolar backward and centrifugally after moving a molar backward and centrifugally.

[0060] And Fig. 11 is a conceptual diagram showing a modified example of the palatal expander shown in Fig. 5, and Fig. 12 is a conceptual diagram showing a stopper with a lock.

[0061] The palatal expander (100) according to the present invention largely includes an expander that expands the maxilla and a distalizer (120) that is a moving means that moves molars and premolars backward and centrifugally.

[0062] Various types of expanders have been developed and used, and one representative type is RPE (110A) illustrated in Fig. 1, and another type is MARPE (110B) illustrated in Fig. 2.

[0063] When the RPE (110A) is installed in the maxilla, among the four arms (116FL, 116FR, 116BL, 116BR) extending to both sides, two front arms (116FL, 116FR) are connected to a premolar band (3S) that surrounds a premolar (1S), and two rear arms (116BL, 116BR) are connected to a molar band (3L) that surrounds a molar (1L). When the expansion part (111) of the RPE (110A) is extended left and right, the molar portions on both sides are pushed outward, thereby expanding the maxillary molar portion.

[0064] MARPE (110B) is in a state where the expansion part (111) is fixed to the maxilla by a mini screw (114), and four arms (116FL, 116FR, 116BL, 116BR) extending from the expansion part (111) on both sides are respectively connected and fixed to a premolar band (3S) that wraps around the premolars (1S) on both sides and a molar band (3L) that wraps around the molars (1L), and as the expansion part (111) is extended, the molars on both sides are pushed outward, thereby expanding the maxilla.

[0065] The difference between the RPE (110A) and MARPE (110B) configured in this way is that the expansion part (111) of the RPE (110A) is supported by being connected to the bands (3S, 3L) fixed to the premolars (1S) and molars (1L), whereas the expansion part (111) of the MARPE (110B) transmits the expansion force to the bone by the mini screw (114). Therefore, in the case of the RPE (110A), while the molars move backward, a reaction of forward movement of the premolars occurs, whereas in the case of the MARPE (110B), since the expansion part (111) is fixed to the maxilla, there is a difference in that the molars can move backward without a reaction of forward movement of the premolars.

[0066] The palatal expander (100) according to the present invention can be applied to both the RPE (110A) or MARPE (110B) described above. In the following, the RPE (110A) and MARPE (110B) are collectively referred to as "expanders," and the palatal expander (100) is classified into the RPE (110A) and distalizer (120) or the MARPE (110B) and distalizer (120) depending on the type of expander that expands the maxilla.

[0067] Below, the coupling relationship between MARPE (110B) and the distalizer (120) is described.

[0068] As shown in FIGS. 3 to 6, the extension part (111) of MARPE (110B) includes a pair of divided bodies (113L, 113R), a bolt hole (115) formed at the front and rear ends of each divided body (113), a mini screw (114) inserted into the bolt hole (115) and fixed to the maxillary bone, a left front arm (116FL) extended to a premolar (1S) in the left divided body (113L), a left rear arm (116BL) extended to a molar (1L) in the left divided body (113L), a right front arm (116FR) extended to a premolar (1S) in the right divided body (113R), a right rear arm (116BR) extended to a molar (1L) in the right divided body (113R), and a bilateral premolar (1S) and bilateral molar (1L) respectively. It includes bands (3S, 3L) each fixedly connected to arms extending from the divided main body (113L, 113R) and auxiliary wires (117) connecting the premolar band (3S) and the molar band (3L).

[0069] As the split body (113L, 113R) of the extension (111) is fixed to the maxilla by a mini screw (114), and the arms extended from the split body (113L, 113R) are fixed to the band (3S, 3L), when the split bodies (113L, 113R) move away from each other, the maxilla on both sides are expanded while receiving force in the away direction.

[0070] Meanwhile, as illustrated in FIG. 4A, the distalizer (120) includes a wire (121), a compression coil spring (123) surrounding the wire (121), a stopper (125) that is in contact with one end of the coil spring (123) and can move longitudinally along the wire (121), a slide tube (127) that is in contact with the other end of the coil spring (123) and through which the wire (121) passes so as to be able to move along the wire (121), and a lever arm (129) formed on the side of the slide tube (127) and silver-soldered or laser-welded to the molar band (3L).

[0071] When the coil spring (123) located between the stopper (125) and the slide tube (127) that can move along the wire (121) is pressed (re-pressed), the coil spring (123) contracts, and the contracted coil spring (123) provides elastic force in the direction of pushing the stopper (125) and the slide tube (127). At this time, as shown in Fig. 9, when the position of the stopper (125) is changed and forcibly fixed to one point of the wire (121), the elastic force of the coil spring (123) pushes the slide tube (127) backward and moves it.

[0072] In addition, as shown in FIG. 4b, a pressure part (122) is formed at the tip of the desalinator (120), and a hole (122H) through which a front arm (116FR, 116FL) passes is formed in the pressure part (122), and a wire (121) is connected to the outside of the pressure part (122), and as shown in FIGS. 5 and 7, when the pressure part (122) is forcibly picked up with a tool or the like, the pressure part (122) is plastically deformed and fixed to one point of the front arm (116FR, 116FL).

[0073] Accordingly, when the front arm (116FR, 116FL) is fitted to the rock hole (122H), the desalinator (120) can move freely in the longitudinal direction of the front arm (116FR, 116FL), but when the pressure part (122) is forcibly picked up with a tool while the pressure part (122) is positioned at any point of the front arm (116FR, 116FL), plastic deformation occurs, that is, the pressure part (122) is distorted and fixed to any point of the front arm (116FR, 116FL).

[0074] Here, as shown in FIGS. 4a and 4b, a cut portion (122S) is formed in the longitudinal direction of the arm hole (122H) so that the pressurized portion (122) can easily undergo plastic deformation when forcibly picked up using a tool and can be firmly fixed to any point of the front arm (116FR, 116FL).

[0075] Meanwhile, as illustrated in FIGS. 5 and 6, the end of the lever arm (129) formed laterally on the upper side of the slide tube (127) is fixed to the molar band (3L) by silver soldering or laser welding. At this time, the coil spring (123) surrounding the wire (121) is preferably maintained in a contracted state, and the wire (121) is preferably extended backwards through the space between the rear arm (116BL, 116BR) and the maxillary bone.

[0076] In order to fix the lever arm (129) to the molar band (3L) by silver soldering or laser welding, the height of the wire (121) of the distalizer (120) must be positioned appropriately. However, since the height of the palatine roof, the palatal slope, and the height of the root furrow of the molar are different for each patient, the height of the wire (121) of the distalizer (120) needs to be adjusted.

[0077] As illustrated in FIG. 7, the front arms (116FR, 116FL) extended on both sides from the split body (113) of the extension (111) are fixed to the premolar band (3S), and as the palatal ceiling is positioned higher than the premolar (1S), the front arms (116FR, 116FL) are curved downward toward the left and right, and as the pressure part (122) of the distalizer (120) moves along the curved front arms (116FR, 116FL), the height (H1, H2) of the wire (121) is configured such that the height decreases as it goes outward from the front arms (116FR, 116FL), and conversely, the height increases as it moves inward from the front arms (116FR, 116FL), so that the height of the wire (121) can be adjusted to an appropriate height of the root branch of the lower molar of the molar band (3L). Therefore, as the distalizer (120) moves along the front arm (116FR, 116FL), it is possible to compensate for individual differences in the height of the palatine roof, the palatal slope, and the root furrow of the molar region, which are different for each patient.

[0078] Once the position to fix the desalinator (120) is set in this way, the pressurizing part (122) is pressed using a tool. At this time, as shown in FIG. 4b, one side of the pressurizing part (122) where the wire (121) is connected has a large amount of material to maintain rigidity, whereas the other side where the arm hole (122H) is formed has a relatively small amount of material at the front and rear (the area indicated by the arrow in FIG. 4b) that wraps around and supports the wire (121) in a tube shape. Therefore, when the front and rear of the pressurizing part (122) are forcibly pinched using a tool, the pressurizing part (122) is crushed and the front arms (116FR, 116FL) are pressed and fixed. At this time, the area where the wire (121) is connected has a large amount of material so that deformation does not occur, and thus the direction of the wire (121) does not become distorted.

[0079] When the palatal expander (100) according to the present invention configured as described above is mounted on the maxillary bone, molars, and premolars, the split main body (113L, 113R) of the expander (111) is extended in a direction away from the maxillary bone, as shown in FIG. 8.

[0080] The maxilla is left in an expanded state for 3 to 4 months, during which time the auxiliary wire (117) and the posterior arm (116BR, 116BL) connecting the molar band (3L) and the premolar band (3S) are cut to enable the molar (1L) to be moved posteriorly.

[0081] As shown in Fig. 9, when the auxiliary wire (117) and the rear arm (116BR, 116BL) are cut, the front arm (116FL, 116FR) to which the tip of the wire (121) is fixed is firmly fixed to the maxilla through the split body (113L, 113R), so that the elastic force of the coil spring (123) acts in a direction that pushes the slide tube (127), and since the slide tube (127) is connected to the molar band (3L), the molar (1L) moves backward and centrifugally by the elastic force of the coil spring (123).

[0082] When the molar (1L) moves backward, the coil spring (123) is stretched and its elasticity weakens. At this time, by changing the position of the stopper (125) in the direction of pressing the coil spring (123) and forcibly picking up the stopper (125) at the changed position and fixing it to the wire (121), the elasticity of the coil spring (123) that moves the molar (1L) backward can be increased.

[0083] As shown in Fig. 9, in order to fix the stopper (125) to the wire (121), the stopper (125) is firmly gripped with a tool such as pliers or a wrench and fixed by plastic deformation.

[0084] Meanwhile, in addition to the method of fixing the stopper (125) to the wire (121) by plastically deforming it as shown in the example of FIG. 9, the stopper (125S) may be fixed to the wire (121) by using a stopper (125S) equipped with a lock function as shown in FIG. 12.

[0085] The configuration of the stopper (125S) equipped with a lock function will be described in detail later, and the process of moving the premolars (1S) backwards and forwards after moving the molars (1L) backwards will be described below.

[0086] As shown in Fig. 9, after the molar (1L) has moved posteriorly, as shown in Fig. 10, the anterior arm (116FR, 116FL) connected to the premolar band (3S) is cut, leaving a length of several millimeters at the point connected to the premolar band (3S) (hereinafter, the portion cut while connected to the premolar band (3S) is referred to as the 'remnant (133)'). The remaining portion (133) of the anterior arm (116FR, 116FL) connected to the premolar band (3S) is used as a hook for a rubber band (130).

[0087] Meanwhile, the lever arm (129) of the desalinator (120) has one to three hooks (131) formed at intervals along its length toward the rear.

[0088] The hook part (131) of the lever arm (129) and the remainder (133) connected to the premolars band (3S) are used as a hook for a rubber band (130). Then, one of the hook parts (131) is selected and a rubber band (130) is hung and fixed.

[0089] At this time, if there are two or three hooks (131), by selecting an appropriate hook (131), the height of the palatine roof, the palatine slope, and the different positions of the root division of the molar can be compensated for according to individual differences.

[0090] After connecting the hook portion (131) of the lever arm (129) connected to the molar band (3L) that has moved backward and the remainder (133) connected to the premolar band (3S) with a rubber band (130), after a predetermined period of time has elapsed, the premolar (1S) moves backward and centrifugally toward the molar (1L) that has moved backward and centrifugally due to the elasticity of the rubber band (130). At this time, the elasticity of the coil spring (123) is configured to be greater than the elasticity of the rubber band (130) so that the molar (1L) that has moved backward and centrifugally does not move forward.

[0091] In this way, in the present invention, after the molar (1L) is moved backwards, the premolars (1S) can be moved backwards toward the molar (1L) only by cutting the front arms (116FR, 116FL) and attaching the rubber band (130). Therefore, the treatment speed and procedure can be performed more easily and quickly than in the past.

[0092] Below, the configuration of a stopper (125S) equipped with a lock function is described.

[0093] As illustrated in FIG. 12, a tab (125T) is formed in a stopper (125S) through which a wire (121) passes, and a bolt (125B) is fastened to the tab (125T), so that the stopper (125S) can be fixed by tightening the bolt (125B) to pressurize the wire (121) with the bolt (125B). In the case of the stopper (125) illustrated in FIG. 9, it is difficult to change the position of the stopper (125) once it is fixed to the wire (121) by plastically deforming the stopper (125), but in the case of the stopper (125S) with a lock illustrated in FIG. 12, there is an advantage in that the position can be changed by loosening the bolt (125B), changing the position of the stopper (125S), and then tightening the bolt (125B).

[0094] In the past, after a retention period of 3 to 4 months, the palatal expander was removed, a new separate distalizer was installed, and the molars were moved posteriorly and centrifugally. However, by using the palatal expander according to the present invention, there is an advantage in that the molars (1L) can be moved posteriorly and centrifugally during the retention period.

[0095] Below, a specific embodiment of a palatal expander according to the present invention described above is described.

[0096] In Fig. 3, the expander is illustrated as being MARPE (110B), but Fig. 11 is a conceptual diagram showing a modified example of a palatal expander according to the present invention in which the expander is configured as RPE (110A).

[0097] When installed in the maxilla, the RPE (110A) is positioned with four arms extending to both sides connected to the premolar band (3S) and the molar band (3L), and when the expansion part (111) of the RPE (110A) is extended, the molars on both sides are pushed outward, thereby expanding the maxilla.

[0098] In the case of RPE (110A) or MARPE (110B), after the expansion of the maxilla is completed, the posterior arm (116BR or 116BL) and auxiliary wire (117) without the distalizer (120) installed are removed to promote posterior movement of the molar (1L).

[0099] And the front arm (116FR, 116FL) connected to the premolar band (3S) is cut off, and the remaining part (133) of the cut front arm (116FR, 116FL) and the hook part (131) of the lever arm (129) are hung with a rubber band (130) so that the premolar band (3S), that is, the premolar (1S), can be moved backward and centrifugally by the elasticity of the rubber band (130).

[0100] The RPE (110A) illustrated in Fig. 11 has a difference in that when the molar (1L) moves backwards by the distalizer (120), there is a reaction in which the premolars (1S) move forward, as the RPE (110A) is supported by the premolars (1S) and the molars (1L).

[0101]

[0102] The adjustable molar posterior movement means according to the present invention and the palatal expansion device having the same can expand the maxilla and distally move molars and premolars posteriorly during a maintenance period of 3 to 4 months, thereby reducing patient discomfort and medical staff manpower. In addition, by installing the palatal expansion device once, treatment can be performed simultaneously, including expansion of the maxilla and distally moving the molars and premolars posteriorly, and thus has industrial applicability.

[0103] In addition, by forcibly picking up and fixing the distalizer in the appropriate position, the position of the distalizer can be easily set and fixed by considering the height difference of the root furrow of the molar part according to the height of the palatine roof and the angle of the palatine slope, which are different for each patient. In addition, when it is desired to move the premolars backward after moving the molars backward, the front arm can be cut so that a remainder remains, and the remaining remainder and the elastic hook of the lever arm can be connected with an elastic rubber band to configure the premolars to move backward toward the molars.

[0104] In this way, after the molars have been moved backwards, the premolars can also be easily moved backwards simply by cutting the anterior arm and installing an elastic body, so it has sufficient potential for industrial use.

Claims

1. An expander that has arms extending to the molars and premolars respectively and moves the maxilla in the width direction while supporting the molars and premolars, A moving means that is mounted on the arm of the expander and moves in the longitudinal direction of the arm and provides elastic force to push the molar backwards; and A palatal expander characterized by including an elastic body hook formed on a moving means so as to be able to connect an elastic body for moving a premolars backward after moving a molar backward.

2. In paragraph 1, The expander is, An extension located between the two molars and capable of stretching in the left and right directions, Multiple cancers extending from the extension to the molar region, Bands that surround the premolars and molars and are connected to each other, A palatal expander characterized by including an auxiliary wire connecting a premolar band surrounding a premolars and a molar band surrounding a molars.

3. In paragraph 2, The extension is, It comprises a pair of split bodies that are fixed to the maxilla by screws, A palatal expander characterized in that a pair of split bodies are elongated while moving in the left and right directions respectively where the molars on both sides are located, and each split body is formed with a front arm connected to a premolar band and a rear arm connected to a molar band.

4. In paragraph 2, The extension is, It comprises a pair of split bodies located between the two molars, A palatal expander characterized in that a pair of split bodies are elongated while moving in the left and right directions respectively where the molars on both sides are located, and each split body is formed with a front arm connected to a premolar band and a rear arm connected to a molar band.

5. In paragraph 3 or 4, A palatal expander characterized in that the moving means includes a wire, a coil spring wrapping the wire, and a slide tube that is in contact with an end of the coil spring and through which the wire passes so as to be movable in the length direction of the wire.

6. In paragraph 5, A palatal expander characterized in that the tip of the wire is fixed to the front arm, the slide tube is fixed to the molar band, and the coil spring provides elastic force to move the molar band backward and centrifugally when the auxiliary wire is cut.

7. In paragraph 5, The means of transport further includes a stopper that contacts the end of the coil spring and fixes the wire at a certain point in its length. A palatal expander characterized by adjusting the elasticity of a coil spring according to the gap between a stopper and a slide tube.

8. In paragraph 6, A palatal expander characterized in that a lever arm is formed on the slide tube and the lever arm is fixed to the molar band.

9. In paragraph 8, A palatal expander characterized in that an elastic body hook portion for fixing one end of an elastic body is formed on the lever arm.

10. In paragraph 9, A palatal expander characterized in that the elastic body hanging portion formed on the lever arm is formed toward the rear.

11. In paragraph 9, A palatal expander characterized in that one to three elastic hooks are formed on the lever arm.

12. In paragraph 9, A palatal expander characterized in that the elastic member is a rubber band, one end of the rubber band is fixed by being hung on an elastic member hook, and the other end of the rubber band is fixed by being hung on the remaining part of the arm connected to the premolar band.

13. In paragraph 5, A pressurized portion is formed at the wire tip of the means of transportation, A hole is formed in the pressurized area through which the front arm penetrates, A palatal expander characterized in that the pressure member is fixed to a certain point of the front arm as the pressure member is plastically deformed by applying pressure.

14. In paragraph 7, A palatal expander characterized in that a tab is formed on the stopper, and a bolt fastened to the tab is tightened to pressurize and fix the wire, or the bolt is loosened to allow the stopper to move along the wire.

15. A pressure part having a width-wise hole formed so that the extended arm from the palatal expander can pass through it, A wire extending outside the pressurized portion, A slide tube through which a wire passes and which can move in the length direction of the wire, A lever arm extending outward from the slide tube and fixed to the molar band; A molar rearward movement means characterized by including a spring located between a pressure part and a slide tube and providing elastic force in the direction of pushing the slide tube.

16. In paragraph 15, A rearward movement means characterized in that an elastic body hook portion for fixing one end of an elastic body is formed on the lever arm.

17. In paragraph 16, A rearward movement means for a molar, characterized in that the elastic body hook formed on the lever arm is formed toward the rear.

18. In paragraph 16, A rearward movement means for a molar, characterized in that one to three elastic hooks are formed on the lever arm.

19. In paragraph 16, A molar posterior movement means characterized in that the elastic body is a rubber band, one end of the rubber band is fixed by hooking it to an elastic body hook, and the other end of the rubber band is fixed by hooking it to the remaining part of the arm connected to the premolar band.

20. In paragraph 15 or 16, A molar posterior movement means characterized in that a cutting part is formed in the width direction along the rock hole in the pressurized part.

21. In paragraph 15 or 16, A rearward movement means for a molar, characterized in that it further includes a stopper movable along a wire, and a spring is interposed between the stopper and the slide tube.

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