JP6732272B1 - Corrector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an orthodontic appliance for promoting proper upbringing of dentition and midface. SOLUTION: A correction tool 1 is provided with a pair of slide members 2, an adjusting mechanism 4, a guide pin 7, and a pressing plate 3. The slide member 2 is attached to each of the right and left sides of the upper dentition. Each slide member 2 is formed with a guide hole 5 extending forward and inward in the width direction in a top view. The adjustment mechanism 4 is provided between the pair of slide members 2 and adjusts the distance between the slide members 2. The guide pin 7 is slidably inserted into each of the pair of guide holes 5. The pressing plate 3 is connected to the guide pin 7 and moves forward and upward as the distance between the slide members 2 adjusted by the adjusting mechanism 4 increases to press the palate. [Selection diagram] Figure 2

Description

The present invention relates to an orthodontic appliance for orthognathic position that is attached to an upper dentition in the oral cavity.

BACKGROUND ART Conventionally, in the fields of orthodontics and maxillofacial oral growth treatment, orthodontic appliances for expanding the dentition in the width direction have been known. For example, there is a method of gradually expanding and correcting the dentition by interposing an elastic member between the right dentition and the left dentition and continuously applying a pressing force from the inside to the outside of the dentition. Proposed. In addition, there is also known a method of expanding and correcting by gradually increasing the distance between the left and right tooth rows by using a member whose size can be changed with a screw instead of the elastic member (for example, see Patent Documents 1 to 3). ).

JP 2006-280689 JP JP 2006-42963 JP JP-A-11-169385

The sound growth of teeth alignment and occlusion is not completed only by expanding and correcting the dentition in the left-right direction. For example, since the root is installed in the trabecular bone of the jawbone, even if the crown is moved outward, the root remains in the state of being restrained by the jawbone, and the correction effect may be weakened. Further, in orthodontics of children and children, the once improved tooth alignment may return to the original state due to the influence of changes in the jaw position accompanying growth. Therefore, it is desired to optimize not only the crown but also the condition of the skeleton of the mid-face including the jawbone in a well-balanced manner.

The present invention was devised in view of such problems, and an object thereof is to provide a correction tool capable of promoting appropriate upbringing of the dentition and the midface.

The correction tool of the present invention is provided with a pair of slide members, an adjusting mechanism, a guide pin, and a pressing plate. The slide member is attached to each of the right and left sides of the upper dentition. A guide hole extending forward and inward in the width direction is formed in each slide member in a top view. The adjustment mechanism is provided between the pair of slide members and adjusts the distance between the slide members. The guide pin is slidably inserted into each of the pair of guide holes. The pressing plate is connected to the guide pin and moves forward and upward as the distance between the slide members adjusted by the adjusting mechanism increases to press the palate.

According to the orthodontic appliance of the present invention, lateral expansion of the maxillary dentition and anterior growth of the midface can be achieved concurrently, and proper cultivating of the dentition and midface can be promoted.

It is a schematic diagram (perspective view) which shows the structure of the correction tool as a 1st Example. It is a disassembled perspective view which decomposes|disassembles and shows the components of the correction tool of FIG. It is a schematic diagram (perspective view) which shows the structure of the adjustment mechanism incorporated in the correction tool of FIG. 4 is a cross-sectional view of the adjustment mechanism of FIG. (A), (B) is a schematic diagram for explaining the operation of the adjusting mechanism of FIG. It is a schematic diagram (perspective view) which shows the structure of the guide member incorporated in the correction tool of FIG. It is sectional drawing of the guide member of FIG. (A), (B) is a schematic diagram for explaining the operation of the guide member of FIG. It is a top view of the correction tool of FIG. 1 (state mounted in the oral cavity). It is a sagittal sectional view which illustrates the structure in the oral cavity with which the correction tool of FIG. 1 is mounted. It is a disassembled perspective view which shows the structure of the correction tool as a 2nd Example. It is a top view of the correction tool of FIG. 11 (state mounted in the oral cavity).

A correction tool as an embodiment will be described with reference to the drawings. The embodiments described below are merely examples, and are not intended to exclude various modifications and application of techniques that are not explicitly described in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the spirit thereof. In addition, they can be selected or combined as needed.

[1. Constitution]
FIG. 1 is a schematic view (perspective view) of a correction tool 1 as an embodiment. The dashed-dotted line in FIG. 1 is an imaginary line showing the contour of the upper jaw teeth to which the orthodontic appliance 1 is attached projected on a horizontal plane, and the two-dot chain line is an imaginary line for showing the attachment position of the orthodontic appliance 1. Is. The correction tool 1 is attached to the upper dentition. The directions (upper, lower, left, right, front, and rear) shown in the drawing are directions with respect to the person wearing the correction tool 1 (direction viewed from the person). The correction tool 1 is attached to at least each of the right side and the left side of the upper dentition. The orthodontic appliance 1 shown in FIG. 1 is attached to the upper jaw in the range from the left and right canine teeth to the first molar.

Note that the target to which the correction tool 1 is attached is not limited to these teeth. For example, the range from the cuspid tooth to the second premolar may be the target for the orthodontic appliance 1 to be mounted, and the range from the first premolar to the first molar may be the target to be mounted on the orthodontic appliance 1. In addition, it is preferable that the wearing target of the correction tool 1 is set symmetrically, but this is not an essential condition. For example, for the dentition on the right side, the orthodontic appliance 1 is installed in the range from the canine to the second premolar, and for the dentition on the left side, the orthodontic appliance 1 is installed in the range from the first premolar to the first molar. Such a method can also be adopted. The wearing target of the orthodontic appliance 1 can be appropriately set according to the shape and arrangement of the dentition of the person to whom the orthodontic appliance 1 is attached. Further, when the deciduous teeth are to be attached to the orthodontic appliance 1, the "canine teeth, premolars" described in the present embodiment may be read as "canine teeth, deciduous teeth" to be understood.

FIG. 2 is an exploded perspective view showing the components of the correction tool 1 in an exploded manner. The chain double-dashed line in FIG. 2 is an imaginary line indicating the position of each component before disassembly. The correction tool 1 is provided with at least a pair of slide members 2, a pressing plate 3, an adjusting mechanism 4, a pair of guide holes 5, and a guide member 6. The slide member 2 and the pressing plate 3 are made of, for example, ceramic, resin, plastic, or the like. The adjusting mechanism 4 preferably has higher rigidity and higher strength than the slide member 2 and the pressing plate 3, and is made of, for example, fiber reinforced resin or metal.

The slide members 2 are a pair of members mounted on each of the right and left sides of the upper dentition. One of the two slide members 2 is attached to the right side of the midsagittal plane (plane that divides the right half body and the left half body) in the oral cavity, and the other is attached to the left side of the midsagittal plane. .. One slide member 2 is formed in a shape that is substantially mirror-symmetrical to the other. The slide member 2 of the present embodiment is provided with a locking portion 15 that is a portion that is locked to the crown and a curved surface portion 16 that is expanded from the locking portion 15 along the palate into a curved shape.

The locking portion 15 is formed, for example, in a three-dimensional shape (impression shape of the tooth row) that matches the shape of the tooth row of the person to whom the orthodontic appliance 1 is attached, and is attached so as to cover the crown. Alternatively, the structure may be indirectly attached to the dentition via a fixing member such as a correction band (a metal part formed in a ring shape surrounding the outer circumference of the tooth) or a wire. Further, the curved surface portion 16 is formed in a curved surface shape along the palate, for example. Of the curved surface portion 16, the portion that comes into contact with the palate is preferably formed into a three-dimensional shape that fits the palate, and the portion that does not come into contact with the palate is preferably formed into a smooth curved surface.

The pressing plate 3 is a member for pressing the palate forward and upward (forward and upward). The pressing plate 3 is a curved member arranged so as to straddle the left and right curved portions 16 in a top view, and is deployed along the median palate suture of the maxilla. Since the upper surface side of the pressing plate 3 contacts the palate (hard palate), it is preferable to form the pressing plate 3 into a three-dimensional shape that fits the palate. Further, a resin sheet or film for protecting the mucous membrane may be welded or attached to the contact portion with the palate. The front end of the pressing plate 3 is formed in a shape that allows a distance of a predetermined dimension or more with respect to the tooth neck so as not to interfere with the teeth. Since the pressing direction of the pressing plate 3 (the direction in which the force acts) is the upper front direction (Superior and Advance direction), the pressing plate 3 can also be referred to as Sup-Ad (supad, supad member).

It is preferable that the lower surface side of the pressing plate 3 has a shape that facilitates sliding in the front-back direction with respect to the slide member 2. In the example shown in FIG. 2, the sliding plate 11 is interposed between the slide member 2 and the pressing plate 3 so that the pressing plate 3 can slide with respect to the sliding member 2. The sliding plate 11 is a member for making the pressing plate 3 slippery, and is formed in a curved surface with a resin sheet or film for protecting mucous membranes. The edges (left and right edges, front edge) of the sliding plate 3 are formed in a shape that ensures a distance of a predetermined dimension or more with respect to the teeth. This makes it difficult for the sliding plate 3 to interfere with the teeth when the distance between the left and right slide members 2 is increased. Therefore, a feeling of strangeness and a feeling of foreign matter when the correction tool 1 is attached are reduced. The sliding plate 11 may be omitted if the pressing plate 3 is sufficiently slippery with respect to the sliding member 2. For example, the upper surface side of the curved surface portion 16 is formed into a spherical shape (or a cylindrical surface shape), and the lower surface side of the pressing plate 3 is formed into a corresponding concave spherical surface shape (or a concave cylindrical surface shape). The slipperiness of the plate 3 is improved.

FIG. 3 is a schematic view (perspective view) showing the structure of the adjusting mechanism 4, and FIG. 4 is a sectional view of the adjusting mechanism 4. The adjustment mechanism 4 is a component for adjusting the distance between the two slide members 2, and is provided between the pair of slide members. The adjusting mechanism 4 is provided with a pair of nut members 21, a screw member 24, and a pair of shaft members 29, which are built in each of the pair of slide members 2.

The nut member 21 is a component that is embedded and fixed in the curved surface portion 16 of each slide member 2. The nut member 21 is provided with a screw hole 22 screwed into the screw member 24 and a sliding hole 23 into which the shaft member 29 is slidably inserted. In the example shown in FIG. 3, one screw hole 22 and two sliding holes 23 are juxtaposed. The screw hole 22 and the sliding hole 23 are formed such that the hole axes are parallel to each other. Further, an arrow symbol A, which serves as a guide when rotating the screw member 24, is engraved on the surface of the nut member 21.

The screw member 24 has a structure in which two screw rods having different thread directions are connected. As shown in FIG. 3, the screw member 24 has a first screw thread portion 25, a second screw thread portion 26, and a rotation operation portion 27. The first screw thread portion 25 is, for example, a threaded rod in which a right-handed screw thread is formed, and the second screw thread portion 26 has a screw thread (left screw) formed in the opposite direction to the first screw thread portion 25. It is a screw rod. These screw thread portions 25 and 26 are coaxially connected to each other via a rotary operation portion 27. A screw hole 22 that is screwed into the first screw thread portion 25 is formed in one of the two nut members 21, and a screw hole 22 that is screwed into the second screw thread portion 26 is formed in the other. ..

The rotation operation part 27 is a part provided to perform an operation of rotating the screw member 24 around the screw shaft. The rotation operating portion 27 shown in FIG. 3 is formed in a cylindrical shape having a diameter slightly larger than that of the screw thread portions 25 and 26. Further, the rotation operation portion 27 has a rotation operation hole 28 having a hole core perpendicular to the cylinder axis. By inserting a wire-shaped operation tool into the rotation operation hole 28, the operation of rotating the screw member 24 becomes easy.

The number of the rotation operation holes 28 can be set arbitrarily, but in consideration of the operability and workability of the operation tool, they should be provided at four positions at least 90 degrees apart on the peripheral surface of the rotation operation part 27. preferable. In this case, for example, the directions of the hole axes of the four rotary operation holes 28 may be set so as to be orthogonal to the hole axes of the adjacent rotary operation holes 28. This makes it easy to repeat the operation of rotating the screw member 24 by 90 degrees. In addition, when the number of the rotation operation holes 28 is set to six places (six places at intervals of 60 degrees on the circumferential surface of the rotation operation part 27), it is easy to repeat the operation of rotating by 60 degrees. Similarly, when the number of rotation operation holes 28 is set to eight (eight locations at intervals of 45 degrees on the peripheral surface of the rotation operation unit 27), it is easy to repeat the operation of rotating by 45 degrees. ..

As shown in FIG. 4, of the surfaces of the screw threads 25 and 26, the portion outside the nut member 21 may be covered with a hollow cylindrical cover 30. This prevents interference between the curved surface portion 16 and the screw thread portions 25 and 26 embedded in the curved surface portion 16, and further facilitates the rotating operation of the screw member 24. Before embedding the adjusting mechanism 4 in the curved surface portion 16, if a portion which may interfere with the screw thread portions 25 and 26 is cut in advance (or if a hole for embedding is formed larger). The cover 30 may be omitted.

The shaft member 29 is a member formed in a tubular shape (for example, a cylindrical shape, a prismatic shape) or a columnar shape (for example, a cylindrical shape, a prismatic shape), and prevents the nut member 21 from rotating when the screw member 24 is rotated. Play a role. The shaft members 29 constrain their respective postures so that the pair of nut members 21 move only in the separating direction (or in the approaching direction). Accordingly, when the screw member 24 is rotated, the pair of nut members 21 slide.

5A and 5B are schematic diagrams for explaining the operation of the adjusting mechanism 4. In the state shown in FIG. 5(A), a wire-like operation tool (not shown) is inserted into the rotation operation hole 28, and rotation operation is performed in the direction of the arrow A shown on the surface of the nut member 21. The nut members 21 slide and move in directions away from each other. As a result, as shown in FIG. 5B, the gap between the two nut members 21 is widened, and the slide member 2 in which each nut member 21 is embedded moves in parallel to the left and right. In this way, the adjustment mechanism 4 functions to adjust the distance of the slide member 2.

The guide hole 5 is a hole formed in each of the slide members 2. An end portion of a guide member 6 described later is inserted into and fixed to the guide hole 5. The opening of the guide hole 5 is set to the facing surface (or the vicinity thereof) that is close to each other among the two curved surfaces 16 that are adjacent to each other on the left and right. Each guide hole 5 is preferably formed in a straight line shape, and is formed in a curved line shape having at least a constant curvature. With such a setting, sliding movement of the guide pin 7, which will be described later, becomes easy.

In this embodiment, the guide hole 5 provided in the right slide member 2 is linearly extended from the innermost portion toward the front and the left direction in a top view. The guide hole 5 provided in the left slide member 2 is linearly extended from the innermost portion toward the front and the right side in a top view. In this way, the guide hole 5 extends forward and inward in the width direction in a top view. Further, the extending direction of the guide hole 5 in a side view is a direction from the innermost portion toward the front upper side (front side and upper side).

FIG. 6 is a schematic view (perspective view) showing the structure of the guide member 6. The guide member 6 is a component for moving the pressing plate 3 forward and upward with the position of the slide member 2 as a reference, and is provided between each slide member 2 and the pressing plate 3. The guide member 6 is provided with a guide pin 7, a pin tube 8, a triangular portion 9, and a bead portion 10. Of these, the guide pin 7 and the pin tube 8 preferably have higher rigidity and higher strength than the slide member 2 and the pressing plate 3, and are formed of, for example, fiber reinforced resin or metal. The triangular portion 9 and the bead portion 10 may be formed of, for example, ceramic, resin, plastic, or may be formed of fiber reinforced resin or metal.

The guide pin 7 is a member that is slidably inserted into two guide holes 5 formed in the slide member 2. The pin tube 8 is a cylindrical member that is fixed while being fitted inside the guide hole 5. The guide pin 7 is slidably inserted into the inner peripheral surface of the pin tube 8. The pin tube 8 may be omitted if the slidability of the guide pin 7 is not hindered.

FIG. 7 is a sectional view of the guide member 6. The overall shape of the guide pin 7 can conform to a V shape. The guide pin 7 shown in FIG. 7 is provided with a first sliding portion 31 inserted into one pin tube 8 and a second sliding portion 32 inserted into the other pin tube 8. These sliding portions 31 and 32 are formed in a shape (for example, linear shape) corresponding to the shape of each guide hole 5. Further, the guide pin 7 of the present embodiment is provided with a connecting portion 33 that linearly connects the first sliding portion 31 and the second sliding portion 32 in the horizontal direction. The front end of the first sliding portion 31 and the front end of the second sliding portion 32 are bridged by the connecting portion 33.

The three elements of the first sliding portion 31, the second sliding portion 32, and the connecting portion 33 can also be formed by bending one rod at two locations. In this case, it is preferable to set the bending radius of the bent portion as small as possible so that the entire V-shaped shape can be easily maintained. For example, the bending radius is set to be equal to or smaller than the diameter of the bar. Thereby, the postures (angles) of the first sliding portion 31 and the second sliding portion 32 with respect to the connecting portion 33 are easily maintained, and more is realized.

The triangular portion 9 is a component for connecting the guide pin 7 to the pressing plate 3, and is fixed to the pressing plate 3. The shape of the triangular portion 9 is an isosceles triangular shape with the apex facing forward in a top view. The guide pin 7 is provided so as to penetrate the triangular portion 9. In the guide pin 7 of this embodiment, the bead portion 10 is slidably mounted on the outer periphery of the connection portion 33, and the guide pin 7 is connected to the triangular portion 9 via the bead portion 10. As a result, swinging of the guide pin 7 about the axis of the connecting portion 33 is allowed, and thus movement of the pressing plate 3 with respect to the slide member 2 in the rotational direction is allowed. Even when the bead portion 10 is omitted, the same action can be obtained by slidably penetrating the guide pin 7 with respect to the triangular portion 9.

In the present embodiment, the upper portion (substantially the upper half portion) of the triangular portion 9 is embedded in the pressing plate 3, and the lower portion (substantially the lower half portion) of the triangular portion 9 is attached so as to be exposed below the pressing plate 3. .. Therefore, when the correction tool 1 is viewed from the lower surface side, the triangular portion 9 having a triangular shape slightly protrudes from the surface of the pressing plate 3. By making the shape of the triangular portion 9 triangular, the triangular portion 9 and the slide member 2 are less likely to interfere with each other, and the smooth sliding movement of the pressing plate 3 is realized.

8A and 8B are schematic views for explaining the operation of the guide member 6. When the space between the left and right slide members 2 is widened in the state shown in FIG. 8A, the pin tubes 8 incorporated in the respective slide members 2 move in parallel to the left and right while maintaining the angle. At this time, the reaction force of the force received from the pin tube 8 by the guide pin 7 inserted in the pin tube 8 acts to move the guide pin 7 forward along the extending direction of the pin tube 8. Therefore, as shown in FIG. 8(B), the guide pin 7 moves forward from the position indicated by the broken line in FIG. 8(B) (corresponding to the position before movement shown in FIG. 8(A)). .. Thus, the guide member 6 functions to move the pressing plate 3 forward and upward as the distance between the two slide members 2 increases.

FIG. 9 is a plan view showing a state in which the correction tool 1 mounted in the oral cavity is looked up from the lower surface side. A mounting bracket 12 for mounting a headgear type upper jaw traction device 13 [for example, a ramper (registered trademark)] may be embedded in each of the left and right slide members 2. By using the maxillary traction device 13 together, the pressing force acting on the palate from the pressing plate 3 is easily maintained, and the therapeutic effect of maxillofacial oral cavity development is improved. When the upper jaw traction device 13 is not used, the mounting bracket 12 can be omitted. Regarding the configuration of the maxillary traction device 13, for example, the configuration described in Japanese Patent No. 5466797 can be applied.

Further, with respect to the angle θ of the V-shaped guide member 6 (the angle formed by the first sliding portion 31 and the second sliding portion 32 and the angle on the rear side of the oral cavity), the more the angle θ is decreased, the more the slide is performed. The amount of movement of the pressing plate 3 (the amount of movement in the upper front direction) relative to the amount of movement of the member 2 (width expansion dimension) increases. On the contrary, as the angle θ increases, the moving amount of the pressing plate 3 with respect to the moving amount of the slide member 2 decreases. Therefore, it is preferable to set the angle θ so that a desired movement amount can be secured, and for example, it is preferable to set the angle θ within the range of 45 degrees to 90 degrees. Such setting of the angle θ is effective in suppressing discomfort and pain when the correction tool 1 is attached.

[2. Action, effect]
(1) The correction tool 1 of the present embodiment is provided with a pair of slide members 2, an adjusting mechanism 4, a pair of guide holes 5, a guide pin 7, and a pressing plate 3. The pressing plate 3 moves forward and upward as the distance between the two slide members 2 increases, and presses the palate. The pressing force of the pressing plate 3 is transmitted to the maxilla 18 and the alveolar bone part 19 via the hard palate 17, as shown in FIG. 10, for example. This makes it easier for the oral cavity to be three-dimensionally expanded not only in the left-right direction but also in the upper front direction. Therefore, the lateral expansion of the maxillary dentition and the anterior growth of the mid-face can be achieved simultaneously in parallel, and proper cultivating of the dentition and the mid-face can be promoted.

In particular, in orthodontics for children and children in the deciduous dentition period to the mixed dentition period, the state of the skeleton of the mid-face including not only the crown but also the jawbone can be optimized in a well-balanced manner. Therefore, it is possible to reduce the possibility that the once improved tooth alignment will be restored. Moreover, the volume in the oral cavity can be increased, and the airway can be easily secured. Thereby, symptoms such as snoring and mouth breathing can be improved, and in addition, symptoms such as inflammation near the tonsils and allergic rhinitis can be relieved. Thus, according to the correction tool 1 of the present embodiment, it is possible to promote appropriate upbringing of the dentition and the midface.

(2) In the correction tool 1 of the present embodiment, each of the pair of guide holes 5 is linearly formed, and the guide pin 7 is provided with the first sliding portion 31 and the second sliding portion 32. Then, these sliding portions 31 are inserted into the respective guide holes 5. With such a configuration, the action direction of the force generated by the movement of the slide member 2 in the left-right direction can be easily changed. Therefore, the pressing plate 3 can be easily moved forward and upward, and the therapeutic effect of maxillofacial oral cavity development can be improved. Further, since the structure is simple, it can be easily manufactured using, for example, a commercially available dental technical material, and the labor and cost for manufacturing and adjusting the orthodontic appliance 1 can be reduced.

(3) If the angle θ of the guide member 6 is set within the range of 45 degrees to 90 degrees, the moving dimension of the pressing plate 3 to the front upper side may be insufficient as compared with the widening dimension of the slide member 2, for example. The upper jaw bone 18 and the alveolar bone part 19 can be appropriately pressed forward and upward. Further, it is possible to prevent the pressing plate 3 from excessively moving as compared with the widened dimension of the slide member 2, and it is possible to reduce the discomfort and pain when the correction tool 1 is attached. In this way, the condition of the skeleton of the mid-face including the jawbone can be optimized in a balanced manner, and the therapeutic effect of maxillofacial oral cavity development can be further improved.

(4) The guide pin 7 of this embodiment has a structure in which the first sliding portion 31 and the second sliding portion 32 are linearly connected by the connecting portion 33, as shown in FIG. 7. The connecting portion between the first sliding portion 31 and the connecting portion 33 is bent so that, for example, the bending radius is equal to or smaller than the diameter of the bar. In this way, the rigidity is increased by bending the ends of the connecting portion 33 suddenly instead of gradually, and the posture (angle) of the first sliding portion 31 and the second sliding portion 32 relative to the connecting portion 33 is increased. It can be easy to maintain. Therefore, the guide pin 7 can be smoothly slid, and the sliding performance of the guide pin 7 can be improved. Further, since the linear portions of the first sliding portion 31 and the second sliding portion 32 become long, the maximum sliding amount of the guide pin 7 can be increased.

(5) The correction tool 1 of this embodiment has a structure in which the connecting portion 33 of the guide pin 7 is fixed to the pressing plate 3 via the triangular portion 9. The bead portion 10 is annularly mounted around the connection portion 33, and the triangular portion 9 is fixed around the bead portion 10. That is, the triangular portion 9 is slidably mounted on the connecting portion 33 and fixed to the pressing plate 3. With such a structure, the swing of the guide pin 7 around the axis of the connecting portion 33 can be permitted, and the movement of the pressing plate 3 with respect to the slide member 2 in the rotational direction can be permitted. Therefore, it becomes easy to fit the pressing plate 3 to the palate regardless of the shape of the palate, and the therapeutic effect for maxillofacial oral cavity development can be further improved.

(6) The correction tool 1 of this embodiment has a structure in which the connecting portion 33 of the guide pin 7 is fixed to the pressing plate 3 via the triangular portion 9. The shape of the triangular portion 9 is an isosceles triangular shape with the apex facing forward in a top view. With such a structure, for example, even when the triangular portion 9 and the pair of slide members 2 are close to each other, it is possible to prevent mutual interference (trap) between these. Therefore, it becomes possible to easily adjust the distance between the slide members 2, and it is possible to further improve the therapeutic effect of maxillofacial oral cavity development.

(7) The adjusting mechanism 4 according to the present embodiment includes a first screw thread portion 25 having a right-hand screw thread, a second screw thread portion 26 having a left-hand screw thread, and these screw threads. It has a pair of nut members 21 screwed into each of the portions 25 and 26 and fixed to each of the pair of slide members 2. By forming the two thread portions 25 and 26 having different thread directions, the interval between the pair of nut members 21 can be easily changed. For example, by rotating the screw member 24 shown in FIG. 3 in the direction of arrow A, the nut members 21 can be separated from each other, and the distance of the slide member 2 can be increased. On the contrary, by rotating the screw member 24 in the opposite direction, the nut members 21 can be brought closer to each other, and the distance of the slide member 2 can be reduced. In this way, the work of adjusting the distance of the slide member 2 to a desired dimension is facilitated, and the convenience of the correction tool 1 can be improved. Therefore, the therapeutic effect of maxillofacial oral cavity development can be further improved.

(8) The nut member 21 of this embodiment is built in each of the left and right slide members 2 as shown in FIG. As a result, the expansion/contraction operation of the adjusting mechanism 4 can be directly reflected in the expansion/contraction operation of the slide member 2, and an equal force can be applied to both the right side and the left side of the tooth row. Therefore, the position of the dentition can be optimized in a well-balanced manner, and the therapeutic effect of maxillofacial oral cavity development can be further improved.

[3. Modification]
In the above-described embodiment, the orthodontic device 1 in which the slide member 2 is configured to apply a force to the dentition in the right direction and the left direction has been exemplified, but the action direction of the force is not limited to this. For example, it may be desired to expand the dentition not only in the lateral direction but also in the front direction. In such a case, the slide direction of the slide member 2 may be set so that the slide member 2 exerts a force on the tooth row in the front right direction and the front left direction.

FIG. 11 is an exploded perspective view showing the components of a correction tool 20 as a modification in an exploded manner, and FIG. 12 is a plan view showing a state in which the correction tool 20 mounted in the oral cavity is looked up from the lower surface side. .. The orthodontic tool 20 is provided with a reference member 14 to be mounted on the upper dentition, and two adjustment mechanisms 4 are attached to the reference member 14. The reference member 14 is provided with a locking portion 15 that is a portion locked to the crown and a curved surface portion 16 that is expanded from the locking portion 15 along the palate into a curved surface. The reference member 14 shown in FIG. 12 is attached to the upper jaw in the range from the left and right first premolars to the first molars.

The slide members 2 are a pair of members that are mounted on teeth different from the reference member 14 on each of the right and left sides of the upper jaw dentition. As shown in FIG. 11, the slide member 2 is provided with a locking portion 35 that is a portion locked to the crown, and a curved surface portion 36 that is developed from the locking portion 35 along the palate into a curved surface. To be The locking portion 35 is mounted so as to cover the crown of a canine, for example. Further, among the end sides of the curved surface portion 36, the end side close to the reference member 14 (rear side end side) is formed in a linear shape along the sliding direction of the slide member 2 in a top view. On the other hand, among the end sides of the curved surface portion 36, the end sides (front side edges) separated from the reference member 14 are formed in a shape in which a distance of a predetermined dimension or more is secured with respect to the teeth. Further, one slide member 2 is formed in a shape that is substantially mirror-symmetrical with respect to the other. The slide member 2 shown in FIG. 12 is attached to the left and right canine teeth of the upper jaw. Note that, in FIG. 12, the slide member 2 and the reference member 14 are arranged adjacent to each other in a state of being in contact with each other, but a gap may be provided between them to prevent interference.

The adjustment mechanism 4 functions to slide each of the pair of slide members 2 with respect to the reference member 14. The right adjustment mechanism 4 slides the right slide member 2 in the front right direction, and the left adjustment mechanism 4 slides the left slide member 2 in the front left direction. In addition, guide holes 5 similar to those in the above-described embodiment are drilled in each slide member 2, and guide members 6 are attached to the guide holes 5. By moving the slide member 2 in the front right direction and the front left direction, the guide pin 7 of the guide member 6 moves forward. Therefore, as in the above-described embodiment, the pressing plate 3 to which the triangular portion 9 of the guide member 6 is fixed slides forward and upward.

As described above, the correction tool 20 is provided with the reference member 14 attached to the upper dentition. Further, the adjustment mechanism 4 functions to adjust the distance between each of the pair of slide members 2 with respect to the reference member 14. By using the orthodontic appliance 20 as described above, it is possible to promote forward expansion of the dentition and the mid-face as compared with the orthodontic appliance 1. In addition, the volume of the oral cavity can be increased more than when the correction tool 1 is used, and the state of the skeleton of the mid-face including the jawbone can be optimized in a well-balanced manner.

The first angle θ ₁ shown in FIG. 12 is the angle formed by the sliding direction D ₁ of the right slide member 2 and the sliding direction D ₂ of the left slide member 2, and is the angle on the rear side of the oral cavity. .. The magnitude of the first angle θ ₁ may be set according to the desired enlargement direction, and is preferably set within the range of 60 degrees to 90 degrees, for example. By setting the first angle θ ₁ as described above, the pressing force of the slide member 2 can be applied to the upper portion of the upper jaw complex. In particular, if the first angle θ ₁ is set to an angle close to 90 degrees, the action on the maxillary complex is increased, and proper midface growth can be promoted.

The second angle θ ₂ shown in FIG. 12 corresponds to the angle θ in the above-described embodiment, and is the angle of the V-shaped guide member 6 (first sliding portion 31 and second sliding portion 31). The angle formed by the portion 32 and the angle on the rear side of the oral cavity). The second angle θ ₂ is preferably set such that the sum of the first angle θ ₁ and the first angle θ ₁ is 130 degrees or more (130 degrees to 180 degrees). In other words, the first angle θ ₁ is set so that the angle at which the guide pin 7 and the sliding directions D ₁ and D ₂ intersect in the top view is within 115 degrees or less (90 degrees to 115 degrees). It is preferable. With such a setting, the state of the skeleton of the midface including the jawbone can be optimized in a balanced manner, and the therapeutic effect of maxillofacial oral cavity development can be further improved.

1 Corrector 2 Slide member 3 Pressing plate 4 Adjusting mechanism 5 Guide hole 6 Guide member 7 Guide pin 8 Pin tube 9 Triangular part 10 Bead part 11 Sliding plate 12 Mounting bracket 13 Upper jaw traction device 14 Reference member 15 Locking part 16 Curved part 17 Hard Palate 18 Maxilla 19 Alveolar Bone 20 Orthodontic Tool 21 Nut Member 22 Screw Hole 23 Sliding Hole 24 Screw Member 25 First Screw Thread 26 Second Screw Thread 27 Rotation Operation Portion 28 Rotation Operation Hole 29 Shaft Member 30 Cover 31 first sliding portion 32 second sliding portion 33 connection portion
A arrow symbol
D ₁ , D ₂ Sliding direction θ angle θ ₁ first angle θ ₂ second angle

Claims (11)

A pair of slide members mounted on each of the right side and the left side of the upper jaw dentition, each having a guide hole extending forward and inward in the width direction in a top view,
An adjusting mechanism that is provided between the pair of slide members and adjusts a distance between the slide members,
A guide pin slidably inserted into each of the pair of guide holes,
A correction plate, comprising: a pressing plate that is connected to the guide pin and moves forward and upward as the distance between the slide members adjusted by the adjustment mechanism increases to press the palate. Each of the pair of guide holes is formed in a linear shape,
The correction tool according to claim 1, wherein the guide pin has a first sliding portion that is inserted into one of the guide holes and a second sliding portion that is inserted into the other of the guide holes. .. The angle on the rear side of the oral cavity among the angles formed by the first sliding portion and the second sliding portion is set within the range of 45 degrees to 90 degrees. Correction tool. The correction tool according to claim 2 or 3, wherein the guide pin has a connection portion that horizontally connects the first sliding portion and the second sliding portion. The correction tool according to claim 4, further comprising a triangular portion that is slidably attached to the connection portion and is fixed to the pressing plate. The correction tool according to claim 5, wherein the triangular portion is formed in an isosceles triangle shape with a vertex facing forward in a top view. The adjusting mechanism includes a first screw thread portion having a right-hand thread, a second screw thread portion having a left-hand screw thread, the first screw thread portion and the second screw thread portion. The correction tool according to any one of claims 1 to 6, further comprising a pair of nut members that are screwed into each of the pair of slide members and fixed to each of the pair of slide members. The correction tool according to claim 7, wherein the pair of nut members are incorporated in each of the pair of slide members. A reference member attached to the upper dentition,
One of the pair of nut members is built in one of the pair of slide members and the reference member,
The correction tool according to claim 7, wherein the other of the pair of nut members is built in the other of the pair of slide members and the reference member. Among the angles formed by the one sliding direction and the other sliding direction of the pair of slide members, the angle on the rear side of the oral cavity is set within the range of 60 degrees to 90 degrees, The correction tool according to item 9. Of the angles formed by the one sliding direction and the other sliding direction of the pair of slide members, the angle on the rear side of the oral cavity is the first angle, and the first sliding portion and the second sliding portion the angle of the rear side of the mouth of the angle as the second angle, the sum of said first angle and said second angle is characterized in that it is set within a range of 180 degrees from 130 degrees, according to claim 2 Claim 9 which cites claim 7 which cites any one of claims 6 to 6 or claim 10 which cites claim 7 which cites any one of claims 2 to 6 The corrective device described.

Images