JP2016077630A - Screw connection strength maintaining tool and orthodontic support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a restriction that is imposed on the pulling direction of a tooth to thereby enable the pulling direction to be changed easily and freely.SOLUTION: A connection strength maintaining tool 1 forms a hole 11 for inserting a screw part 3 of a mini screw 2, and has a seat 10 for receiving a head 5 of the mini screw 2. Also, the connection strength maintaining tool 1 has three legs 13 extending in the screwing direction of the mini screw 2 from a periphery of the seat 10. Further, the connection strength maintaining tool 1 has a bendable arm 9 for pulling a tooth, which the arm is connected by brazing or welding. When the mini screw 2 is screwed into jawbones while a screw 3 is inserted in the hole 11 of the connection strength maintaining tool 1, a flange 7 is received by the seat 10 and the tips of the three legs 13 are brought into press contact with the surface of jawbones by the pushing of the flange 7. The bendable arm 9 eliminates the restriction being imposed on the pulling direction of the tooth, and thereby the pulling direction can be changed easily and freely.SELECTED DRAWING: Figure 1

Description

  [Technical Field] The present invention relates to a tool for maintaining a binding force of a screw and an orthodontic support suitable for use in orthodontic treatment.

In orthodontic treatment, in order to move a target tooth by an orthodontic force, a fixed source that resists the orthodontic force is required. In general, other teeth (molar teeth, etc.), head, neck, etc. have been used as a fixation source.
However, when other teeth are used as a fixed source, there is a drawback that teeth that are not desired to move may move. Further, when the head or neck is used as a fixed source, there is a disadvantage that cooperation with the patient is indispensable because it is not effective unless a device such as a headgear is attached.

Bra ・ ・ nemark (a ・ ・ has a notation on top of a) and others has developed a biocompatible titanium artificial dental root (dental implant) that shows strong osseo-integration. Since then, orthodontic treatment using it as an absolute fixation source has been devised and used in the 1960s.
However, titanium dental implants are extremely expensive and have limited implantation sites, are highly surgically invasive, and are firmly bonded to bone, so they can be removed after implantation. In recent years, orthodontic treatment using mini-screws, which have been used to fix bone fragments in the treatment of fractures, has been carried out for reasons such as difficult and difficult to use as temporary fixation for temporary use. (See, for example, Patent Document 1 and Patent Document 2). In this technique, for example, a miniscrew is embedded and fixed in the oral cavity such as the jawbone, alveolar bone, cheekbone, and palatal bone (hereinafter referred to as “jawbone etc.”), and the plate, wire, chain, spring, etc. Is supported and fixed. By using the mini screw, the surgical invasion is small and the patient's discomfort can be reduced.

On the other hand, in order to obtain stability after implantation of the mini screw, a certain length and diameter are required, but on the other hand, there is a risk of causing contact with the tooth root and a decrease in the binding force resulting therefrom, These are in a trade-off relationship. For this reason, even though conventional miniscrews have been improved, there is still a limitation on the area where embedding is possible, and if the length is shortened or the diameter is reduced to avoid the above risk, it will fall off. The current situation is that the risk of breakage cannot be eliminated.
Therefore, the applicant of the present application maintains the screw coupling force for the purpose of dramatically increasing the safety and the screw coupling force, greatly reducing the dropout of the screw, and expanding the application range of the implantable region. A tool and a screw with a binding force maintaining tool have been proposed (see Patent Document 3).

Japanese Patent Application Laid-Open No. 11-164843 JP 2001-187071 A International Publication No. 2014/088116

  Since the mini screw is rotated to the right to be embedded and fixed in the jawbone or the like, if a rotational force in the opposite direction to the right rotation is applied, it will fall off. Therefore, when a plate, a wire, a chain, a spring, or the like is supported by the mini screw, it is necessary to prevent the reverse rotational force from being applied to the mini screw, and a restriction is imposed on the tooth pulling direction.

  The present invention has been made in view of the above points, and an object of the present invention is to make it possible to easily and freely change the traction direction without imposing restrictions on the traction direction of the teeth.

The screw binding force maintaining device of the present invention is for enhancing the holding force of the screw in a state where the screw used as a fixing source when applying a correction force for tooth movement is embedded in the cortical bone. A screw binding force maintaining tool, wherein a hole through which the screw portion of the screw is inserted is formed, and a seat portion that receives the head portion of the screw, and so as to spread outward from the periphery of the seat portion, and gradually A plurality of leg portions extending in the screwing direction of the screw so as to be thinned, and a bendable arm provided on the coupling force maintaining tool for pulling teeth, and the screw portion is inserted into the hole. When the screw is screwed into the cortical bone in a state of being in a state, the head portion is received by the seat portion, and the tips of the plurality of leg portions are pushed by the head portion. Characterized in that it pressed against the serial cortical bone.
Another feature of the present invention is that the bendable arm is coupled to the coupling force maintaining tool by brazing or welding.
The orthodontic support of the present invention is used as a fixing source when applying an orthodontic force for tooth movement, and has a screw to be embedded in cortical bone and a hole through which the screw portion of the screw is inserted. A seat portion for receiving the head portion of the screw, a plurality of leg portions extending in the screwing direction of the screw so as to spread outwardly from the periphery of the seat portion and gradually becoming thinner, and maintaining the binding force A coupling force maintaining tool having a bendable arm for pulling teeth, and a biasing member provided between the screw and the coupling force maintaining tool, for biasing the coupling force maintaining tool. When the screw is screwed into the cortical bone with the screw part inserted through the hole, the head part is received by the seat part and is pushed by the head part. The tip of the plurality of legs are pressed against the cortical bone, from this state, and wherein the tip of each leg by the biasing member has to bite into the cortical bone.
Another feature of the orthodontic support according to the present invention is that the bendable arm is coupled to the coupling force maintaining tool by brazing or welding.

  According to the present invention, the coupling force maintenance tool can dramatically increase the safety and the coupling force of the screw, greatly reduce the dropout of the screw, and expand the application range of the implantable region, By providing the bendable arm in the coupling force maintaining tool, the pulling direction can be easily and freely changed without imposing any restriction on the pulling direction of the teeth.

It is a figure which shows the coupling force maintenance tool of the screw which concerns on 1st Embodiment. It is a perspective view which shows the coupling force maintenance tool of the screw which concerns on 1st Embodiment. It is a perspective view which shows the miniscrew which concerns on 1st Embodiment. It is a figure which shows the use condition of the orthodontic support body which concerns on 1st Embodiment. It is a figure which shows the usage example of the orthodontic support body which concerns on 1st Embodiment. It is a perspective view which shows the support body for orthodontics which concerns on 2nd Embodiment. It is a figure for demonstrating the orthodontic support body which concerns on 3rd Embodiment. It is a figure which shows the example of a miniscrew.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
The inventor of the present application has determined that it is insufficient to seek improvement only for the mini screw, and has invented a “screw coupling force maintaining device” as an auxiliary device.
1 (a) to 1 (c) and FIG. 2 show a screw binding force maintaining tool 1 according to a first embodiment to which the present invention is applied. FIG. 3 shows the mini screw 2.

The mini screw 2 shown in FIG. 3 is used as a fixed source when it is embedded in a jawbone or the like in the oral cavity in the orthodontic treatment to give a correction force for tooth movement.
The mini screw 2 has a screw part 3, a cylindrical part 4, and a head part 5 from the lower side. The screw part 3 is embedded in the jawbone or the like, and a part of the head part 5 is exposed to the outside in the oral cavity. The head portion 5 includes an engaging portion 6 on the upper end side and a flange portion 7 located on the screw portion 3. The engaging portion 6 has a substantially hexagonal column shape, and a cross groove 8 is formed on the upper surface thereof. The screw part 3 can be screwed by fitting a tool such as a screwdriver on the side surface of the engaging part 6 or turning the tool in a state where the tool is inserted into the cross groove 8 and engaged with the engaging part 6. it can.

The binding force maintenance tool 1 shown in FIGS. 1A to 1C and FIG. 2 is used to enhance the maintenance force of the miniscrew 2 embedded in a jawbone or the like.
The coupling force maintaining tool 1 has a seat portion 10 that receives the head portion 5 of the mini screw 2. A hole 11 through which the screw portion 3 of the mini screw 2 is inserted is formed in the center of the seat portion 10. Here, the lower surface of the flange portion 7 of the mini screw 2 has an arcuate taper shape, and the seat portion 10 also has an arcuate concave portion 12 corresponding thereto.
Further, the coupling force maintaining tool 1 has three leg portions 13 extending from the periphery of the seat portion 10 in the screwing direction of the mini screw 2. Each leg portion 13 extends so as to swell and expand in an arc shape outward from the periphery of the seat portion 10 and gradually becomes narrower. The adjacent leg portions 13 are connected by a circular arc surface portion 14 that is recessed inward, and the circular arc surface portion 14 functions as a reinforcing portion of the leg portion 13.

  When the mini screw 2 is embedded and fixed in a jaw bone or the like in the oral cavity, the screw portion 3 is screwed into the jaw bone or the like while being inserted into the hole 11 of the coupling force maintaining tool 1. As a result, as shown in FIG. 4, the flange 7 is received by the seat portion 10 and is pressed by the flange portion 7 so that the tips of the three leg portions 13 are pressed against the surface 15 such as the jawbone. In the present embodiment, the tip of each leg 13 is shaped like a sharp blade or needle that is pointed like a triangular pyramid or a cone like the tip of a knife or nail, for example, and the tip of each leg 13 is a jawbone or the like. It is assumed that about 0.1 to 0.9 mm is encroached when the torque at the time of implantation into the cortical bone becomes about 5 to 30 N. The amount of biting in is not limited, and may be smaller than 0.1 mm or larger than 0.9 mm as necessary.

Here, a bendable arm 9 for pulling teeth, that is, an arm that can be bent or twisted, is coupled to the coupling force maintaining tool 1 by brazing, welding, or the like. The tip of the bendable arm 9 has a hook shape, and for example, a chain or a spring hung on a bracket fixed to a tooth can be locked.
The position at which the bendable arm 9 is provided in the binding force maintaining tool 1 is not limited, but the bendable arm 9 can be placed in the oral cavity even when the tip of each leg 13 bites into the cortical bone such as the jawbone as shown in FIG. It must be exposed to the outside inside. Moreover, although the length of the bendable arm 9 can be freely adjusted, a short type, a long type, or a middle length type may be prepared.

By using the binding force maintaining tool 1 according to this embodiment, the binding force of the mini screw 2 can be dramatically improved, and the contact area with the cortical bone having high hardness is increased and the mechanical fitting force is increased. The dropout of the mini screw 2 can be greatly reduced.
That is, the leg 13 of the binding force maintaining tool 1 presses against the surface of the jawbone or the like (dense and high-strength cortical bone) and bites into the cortical bone. It can be improved dramatically.
As described above, since the maintenance force of the mini screw 2 can be dramatically improved, the conventional mini screw (diameter of about 1.2 to 2.0 mm, length of about 4.0 to 8.0 mm) is of course. In addition, it becomes possible to use a mini screw having a short length which could not be used conventionally. This not only makes it possible to avoid contact with the tooth root in the jawbone or the like, but also eliminates expensive image inspection such as CT, radiation exposure, advanced diagnostic techniques, and advanced treatment techniques. Furthermore, the expansion of indications that can be used with mini-screws for young people in the deciduous dentition stage and mixed dentition stage is an extremely superior point compared to the prior art.

Moreover, in the binding force maintenance tool 1 to which the present invention is applied, the tips of the three leg portions 13 are configured to press into the surface of the jaw bone or the like and bite into the cortical bone, for the following reason. .
That is, the surface of the jawbone or the like is not necessarily a flat surface, but has a complex shape with irregularities. Therefore, for example, when using a disc-shaped washer, a gap is formed between the washer and the surface of the jawbone or the like. On the other hand, in the binding force maintaining tool 1 to which the present invention is applied, even if the surface of the jaw bone or the like has a complicated shape with irregularities, the tip of the leg portion 13 is sharp, so that each leg portion 13 bites in. By being different, the tips of the three legs 13 can be reliably brought into contact with the surface of the jawbone or the like.
In the oral cavity, the jawbone and the like are covered with gums. Therefore, for example, when considering using a disc-shaped washer, the washer may press the gingiva and cause necrosis due to blockage of blood flow. Alternatively, a large surgical invasive treatment of peeling the gingiva over a wide area (the area of the washer) is required. On the other hand, in the coupling force maintaining tool 1 to which the present invention is applied, such a problem does not occur because the tips of the three legs 13 may be brought into pressure contact with the surface of the jawbone or the like.

Further, the binding force maintaining tool 1 to which the present invention is applied is provided with a bendable arm 9 for pulling teeth. Thereby, since the traction force does not act directly on the mini screw 2, the traction direction of the teeth can be determined regardless of the rotation direction of the mini screw 2. Further, by bending the bendable arm 9, the pulling direction can be easily and freely changed.
FIG. 5 shows an example in which an orthodontic support composed of the binding force maintaining tool 1 and the miniscrew 2 is provided on the maxilla. As shown in FIG. 5, by appropriately setting the length, extending direction, and bending direction of the bendable arm 9, the fixed source can be freely set three-dimensionally, and can correspond to various pulling directions. It becomes possible (for example, High zone, Medium zone, Low zone in the figure). In FIG. 5, the front teeth are illustrated as an object, but other teeth (canine teeth, molar teeth, etc.) can also be targeted.

(Second Embodiment)
In 1st Embodiment, the example in which the orthodontic support body is comprised by the bonding force maintenance tool 1 and the miniscrew 2 which are separate bodies was demonstrated. As a second embodiment, an orthodontic support in which the binding force maintaining tool 1 and the mini screw 2 described in the first embodiment are integrated will be described.
FIG. 6 shows an orthodontic support according to an embodiment to which the present invention is applied. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and the detailed description is abbreviate | omitted.
A retaining member is provided from the screw part 3 side so that the coupling force maintaining tool 1 does not fall off the mini screw 2 and the mini screw 2 and the coupling force maintaining tool 1 can be relatively rotated. Since the flange portion 7 is provided, the coupling force maintaining tool 1 does not come out in the direction of the head portion 5 of the mini screw 2.

(Third embodiment)
As a third embodiment, an orthodontic support having a biasing member as a component in addition to the binding force maintaining tool 1 and the miniscrew 2 will be described.
FIG. 7 shows an orthodontic support according to an embodiment to which the present invention is applied. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and the detailed description is abbreviate | omitted.

As shown in FIG. 7, the mini screw 2 has a head portion 5. Further, the coupling force maintaining tool 1 is formed with a hole 11 (not shown in FIG. 7) through which the screw portion 3 of the mini screw 2 is inserted, and a seat portion 10 that receives the head portion 5 of the mini screw 2 and the seat portion 10. A plurality of legs 13 extending from the periphery in the screwing direction of the miniscrew 2 and a bendable arm 9 for pulling teeth provided on the coupling force maintaining tool 1 are provided.
In addition, in FIG. 7, although each part is represented typically and the flange part 7 of the head part 5 of the mini screw 2 is illustrated in a flat shape, the mini part as described in the first and second embodiments is illustrated. The shape of the screw 2 or the shape of the binding force maintaining tool 1 may be used.

  In the present embodiment, an urging member 16 made of, for example, a silicone ring is sandwiched between the head portion 5 of the mini screw 2 and the seat portion 10 of the coupling force maintaining tool 1.

  When the miniscrew 2 is embedded and fixed in a jawbone or the like in the oral cavity, the screw portion 3 is screwed into the jawbone or the like while being inserted into the hole 11 of the binding force maintaining tool 1 as shown in FIG. As a result, as shown in FIG. 7B, the biasing member 16 is compressed and the flange 7 is received by the seat portion 10, and the tip of the leg portion 13 is pushed by the flange portion 7 so that the tip of the leg portion 13 is a surface 15 such as a jawbone. And press into the cortical bone. Then, when time elapses from the state of FIG. 7B (for example, after 4 to 8 weeks), as shown in FIG. 7C, the tip of each leg portion 13 is cortex such as a jawbone by the biasing member 16. Gradually invades the bone. Thereby, a strong maintenance force can be exhibited. Then, as shown in FIG.7 (d), the biasing member 16 can be removed and the miniscrew 2 can also be tightened.

  In addition, you may make it provide the stopper which controls the movement amount of the coupling force maintenance tool 1 by the urging | biasing member 16. FIG. The amount of biting of the tip of each leg 13 into the cortical bone such as the jawbone can be appropriately set by the stopper, and excessive biting can be prevented.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
For example, the mini screw 2 is not limited, and various mini screws can be used. The example of the miniscrew 2 is shown to Fig.8 (a)-(d). FIGS. 8A and 8B show a type in which the screw portion 3 is straight. FIG. 8A shows a double-pitch mini screw 2 in which the pitch of the portion screwed into the dense and high strength cortical bone is fine and the pitch of the portion screwed into the sea surface bone is rough. FIG. 8B shows a mini screw 2 in which the pitch of the screw part 3 is equal throughout the entire area. FIGS. 8C and 8D show a tapered type in which the screw portion 3 is reduced in diameter toward the tip. FIG. 8C shows a double-pitch mini screw 2 in which the pitch of the portion screwed into the dense and high-strength cortical bone is fine and the pitch of the portion screwed into the sea surface bone is rough. FIG. 8D shows a mini screw 2 in which the pitch of the screw portion 3 is the same in the entire area.

Moreover, although the coupling force maintenance tool 1 demonstrated the example which has the three leg parts 13 in the said embodiment, the number is not restricted. However, it is preferable to have three or more leg portions 13 because the stability is increased by three-point support or more than two-point support. On the other hand, when the number of the leg portions 13 is increased, the number of places to be pressed against the gingiva increases or the number of places where the gingiva is peeled off increases.
Moreover, the size of each part should just be selected suitably according to the thickness of a gingiva, a cortical bone, etc., and is not limited. In addition, it is preferable that the height of the binding force maintaining tool 1 is lowered so that the portion of the oral cavity that comes out of the gingiva is minimized.

  1: Binding force maintaining tool, 2: Mini screw, 3: Screw part, 5: Head part, 9: Bendable arm, 10: Seat part, 11: Hole, 12: Recessed part, 13: Leg part, 14: Arc Surface part, 16: biasing member

Claims (4)

  A screw coupling force maintaining tool for enhancing the retaining force of a screw used as a fixation source when applying a correction force for tooth movement in a state of being embedded in cortical bone, A hole through which the screw portion of the screw is inserted is formed, and a seat portion that receives the head portion of the screw, and extends in the outside from the periphery of the seat portion, and in the screwing direction of the screw so as to be gradually narrowed. A plurality of leg portions to be stretched, and a bendable arm for pulling teeth provided on the binding force maintaining tool, and the screw portion is inserted into the hole and the screw is inserted into the cortical bone. When screwed, the head portion is received by the seat portion, and the tips of the plurality of leg portions are pressed against the cortical bone by being pushed by the head portion. Bonding force device for maintaining the screw.   The said bendable arm is couple | bonded with this coupling force maintenance tool by brazing or welding, The coupling force maintenance tool of the screw of Claim 1 characterized by the above-mentioned.   A seat that is used as a fixation source when applying orthodontic force for tooth movement, has a screw that is embedded in cortical bone, and a hole through which the screw portion of the screw is inserted, and receives the head portion of the screw A plurality of leg portions extending in the screwing direction of the screw so as to spread outward from the periphery of the seat portion and gradually narrow, and the teeth provided on the coupling force maintaining device are pulled. And a biasing member provided between the screw and the coupling force maintaining tool for biasing the coupling force maintaining tool, the screw portion being disposed in the hole. When the screw is screwed into the cortical bone in a state of being inserted through the head, the head portion is received by the seat portion, and is pushed by the head portion so that the tips of the plurality of leg portions are in front. Pressed against the cortical bone, from that state, orthodontic support, characterized in that the tip of each leg by the biasing member has to bite into the cortical bone.   The orthodontic support according to claim 3, wherein the bendable arm is coupled to the coupling force maintaining tool by brazing or welding.

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