WO2021088429A1

WO2021088429A1 - Micro-screw, attachment, orthodontic anchorage, and method

Info

Publication number: WO2021088429A1
Application number: PCT/CN2020/104917
Authority: WO
Inventors: 卫彦; 邓旭亮; 韩冰; 陈贵; 吕汶諠; 余婷婷; 张云帆
Original assignee: 北京大学口腔医学院
Priority date: 2020-02-18
Filing date: 2020-07-27
Publication date: 2021-05-14
Also published as: DE202020107040U1; JP3235492U

Abstract

A micro-screw, an attachment, an orthodontic anchorage, and a method. The micro-screw comprises, sequentially connected, a head part (1), a neck part (2), and a screw thread part (3), the screw thread part (3) being used to cut bone tissue through alveolar bone, and a fixing groove (1.1) being provided on an end surface of the head part (1). The attachment comprises a fixing block (4) used for insertion into the fixing groove (1.1), and a connection structure (5) used for connection with a traction assembly. The orthodontic anchorage comprises the micro-screw and the attachment. By means of switching the attachment, the range of manners and directions of force application of the micro-screw of the orthodontic anchorage can be expanded.

Description

Microscrews, accessories, orthodontic anchorage and methods

Technical field

The invention belongs to the field of human implantable medical devices, and more specifically, relates to a microscrew, an accessory, an orthodontic anchorage and a method.

Background technique

Compared with the traditional orthodontic anchorage, microscrews can provide absolute anchorage. In the process of adduction of the anterior teeth in the case of double protrusion, because the traction force is applied to the alveolar bone through the microscrews, it will hardly cause the posterior teeth to move forward, and can maximize Adduction of the anterior teeth improves the protrusion; in the case of full dentition, the microscrews can also push the molars back well and bring good correction results. It can be said that with the aid of microscrews, orthodontists can control tooth movement more precisely without relying on the cooperation of the patient; in addition, microscrews also have the advantages of small size and flexible use, and have been widely used in clinical practice since the 1990s. It has played an important role in the treatment of some complex and serious malocclusions.

However, in order to ensure stability, the position of microscrew implantation is generally located at one-third of the height of the root tip. In clinical applications, the direction of force is higher, which sometimes leads to undesirable posterior teeth depression.

Therefore, we look forward to the development of a microscrew, accessory, orthodontic anchorage and method to increase the force method of orthodontic anchorage, expand the range of force direction, and make orthodontic anchorage more flexible in clinical orthodontic applications.

Summary of the invention

The purpose of the present invention is to provide a microscrew, accessory, orthodontic anchorage and method, so that the orthodontic anchorage microscrew can be used more flexibly in orthodontic clinics.

In order to achieve the above-mentioned object, the present invention provides a microscrew, which includes a head, a neck and a threaded portion that are sequentially connected. The threaded portion is used to cut bone tissue through the alveolar bone. The end surface of the head is provided with a retainer. groove.

Optionally, the side of the head is provided with a ligation hole, the axial direction of the ligation hole is perpendicular to the length direction of the main body of the microscrew, and the ligation hole penetrates the head.

Optionally, the retention groove is a cylindrical groove, and a positioning groove is provided on the side wall of the cylindrical groove, and the positioning groove penetrates the cylindrical groove along the axial direction of the cylindrical groove. groove.

Optionally, the head is a regular hexagonal prism, the neck and the threaded portion are both cylindrical, and the free end of the threaded portion is a tip.

Optionally, the material of the orthodontic anchor microscrew is tantalum alloy.

The present invention provides an accessory for mounting on the above-mentioned microscrew. The accessory includes a retaining block and a connecting structure. The connecting structure is arranged at one end of the retaining block and the other end of the retaining block. It is used for inserting into the retaining groove, the shape of the other end of the retaining block is adapted to the shape of the retaining groove, and the connecting structure is used for connecting the traction assembly.

Optionally, the connecting structure is a boss, the boss includes a large-diameter end and a small-diameter end that are connected, the small-diameter end is connected to the retaining block, and a tenon is provided on the top surface of the large-diameter end. The cross-shaped groove extends downward from the top surface of the large-diameter end to the end surface of the one end of the retaining block.

Optionally, the connecting structure includes an extension rod and a hook, one end of the extension rod is hinged to the retention block, and the hook is installed at the other end of the extension rod.

Optionally, the connecting structure is a traction rod, one end of the traction rod is fixedly connected to the retention block, and the other end of the traction rod is provided with a cambered plug.

Optionally, the connecting structure is in the shape of a hat and is buckled on the one end of the retaining block to protect the oral mucosa.

The present invention provides an orthodontic anchorage, including: the above-mentioned microscrew and the above-mentioned accessory.

The present invention provides an orthodontic method using the above-mentioned orthodontic anchorage, and the method includes the following steps:

Injection of anesthetics at the implantation site;

Make the threaded part of the micro screw body deep into the implantation site, and stop when the neck of the micro screw body is completely submerged in the soft tissue;

Rotate the main body of the microscrew so that the axis of the ligation hole is horizontal;

Put an appropriate amount of medical glue in the retention slot;

Insert the other end of the retaining block into the retaining slot to fix the accessory on the head of the micro screw body;

Connect the orthodontic traction component to the connecting structure at one end of the retaining block.

The beneficial effects of the present invention are:

1. The orthodontic anchorage microscrew is implanted into the alveolar bone through the threaded part. The retention groove on the head of the orthodontic anchorage microscrew can be used to install various accessories. Its structure is reasonable and can be replaced by the replacement of the orthodontic anchor. The accessory for the head installation of the anti-microscrew expands the range of the force method and direction of the orthodontic anchorage microscrew, so that the orthodontic anchorage microscrew can be used more flexibly in the orthodontic clinic and reduces the number of microscrews in the operation. Adverse events of rupture.

2. Install the accessory on the head of the micro-screw body with the help of the mechanical fixing force between the retention groove and the retention block and the chemical retention force of the medical glue, and use the connection structure on the accessory to connect the orthodontic traction component, When you need to change the force application method or direction, you only need to remove the accessory and replace it with an accessory that meets your needs.

3. Insert the main body of the micro screw into the alveolar bone through the threaded part, and install the accessory on the head of the main body of the micro screw by means of the mechanical fixing force between the retention groove and the retention block and the chemical retention force of the medical glue. The connecting structure on the accessory is used to connect the orthodontic traction component. When the force application method or the force direction needs to be changed, the accessory only needs to be removed and replaced with an accessory that meets the requirements. Its structural design is reasonable, and by replacing a variety of accessories, the range of the force method and direction of the orthodontic anchorage microscrews is expanded, so that the orthodontic anchorage microscrews can be more flexibly used in orthodontic clinics and reduce operations. An adverse event of micro-screw fracture.

Other features and advantages of the present invention will be described in detail in the following specific embodiments.

Description of the drawings

Through a more detailed description of the exemplary embodiments of the present invention in conjunction with the accompanying drawings, the above and other objectives, features and advantages of the present invention will become more apparent. Among them, in the exemplary embodiments of the present invention, the same reference numerals generally represent The same parts.

Fig. 1 shows a schematic structural diagram of a micro screw body according to an embodiment of the present invention.

Fig. 2 shows a top view of a micro screw body according to an embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of an accessory according to an embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of an accessory according to an embodiment of the present invention.

Fig. 5 shows a schematic structural diagram of an accessory according to an embodiment of the present invention.

Fig. 6 shows a schematic structural diagram of an accessory according to an embodiment of the present invention.

Description of Reference Signs

1. Head; 1.1. Retention groove; 1.2. Ligation hole; 2. Neck; 3. Threaded part; 4. Retention block; 5. Connection structure.

Detailed ways

The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

The invention provides a microscrew, which comprises a head, a neck and a threaded part which are connected in sequence. The threaded part is used for cutting bone tissue through the alveolar bone, and the end surface of the head is provided with a retention groove.

Specifically, the orthodontic anchorage microscrews are implanted into the alveolar bone through the threaded part. The retention grooves on the heads of the orthodontic anchorage microscrews can be used to install various accessories. The structure is reasonable and can be replaced by orthodontic The attachment for the head installation of the anchorage microscrew expands the range of the force method and direction of the orthodontic anchorage microscrew, so that the orthodontic anchorage microscrew can be used more flexibly in the orthodontic clinic and reduces the number of microscrews in the operation. An adverse event of screw fracture.

As an alternative, the side of the head is provided with a ligation hole, the axial direction of the ligation hole is perpendicular to the length direction of the main body of the microscrew, and the ligation hole penetrates the head.

Specifically, the ligation hole is used to pass the ligation wire, and during use, the axial direction of the ligation hole should be kept horizontal to facilitate the lateral penetration of the ligation wire.

As an optional solution, the retaining groove is a cylindrical groove, and a positioning groove is provided on the side wall of the cylindrical groove, and the positioning groove penetrates the cylindrical groove along the axial direction of the cylindrical groove.

Specifically, the retaining groove is designed in a cylindrical shape to facilitate the installation of the retaining block, and the side wall of the cylindrical groove is provided with a positioning groove to prevent the retaining block from rotating in the retaining groove.

As an alternative, the head is a regular hexagonal prism, the neck and the threaded part are both cylindrical, and the free end of the threaded part is a tip.

Specifically, the threaded part is used to cut bone tissue through the alveolar bone, so the free end is the tip.

As an alternative, the material of the orthodontic anchor microscrew is tantalum alloy.

Specifically, the commonly used microscrews in clinical use are made of titanium alloy. Due to insufficient steel, accidents of microscrew fractures occur from time to time during the operation. Therefore, tantalum metal materials can be used for production, which has strong rigidity and good biological safety. It improves the stability of orthodontic anchor nails, increases the clinical application range of orthodontic anchor nails, and reduces the adverse events of microscrew breakage during surgery.

The present invention provides an accessory for mounting on the above-mentioned micro screw. The accessory includes a retaining block and a connecting structure. The connecting structure is arranged at one end of the retaining block, and the other end of the retaining block is used to be inserted into the retaining slot. Among them, the shape of the other end of the retaining block is adapted to the shape of the retaining groove, and the connecting structure is used for connecting the traction component.

Specifically, the accessory is installed on the head of the micro-screw body by the mechanical fixing force between the retention groove and the retention block and the chemical retention force of the medical glue, and the connecting structure on the accessory is used to connect the orthodontic traction assembly , When you need to change the way of applying force or the direction of applying force, you only need to remove the accessory and replace it with an accessory that meets your needs.

As an alternative, the connecting structure is a boss, the boss includes a large-diameter end and a small-diameter end connected, the small-diameter end is connected to the retaining block, the top surface of the large-diameter end is provided with a cross-shaped groove, and the cross-shaped groove is formed by The top surface of the large diameter end extends downward to the end surface of one end of the retaining block.

As an alternative, the connection structure includes an extension rod and a hook, one end of the extension rod is hinged to the retaining block, and the hook is installed at the other end of the extension rod.

As an alternative, the connecting structure is a traction rod, one end of the traction rod is fixedly connected to the retaining block, and the other end of the traction rod is provided with a curved plug.

As an alternative, the connecting structure is in the shape of a hat and is buckled on one end of the retaining block to protect the oral mucosa.

Specifically, by designing attachments with different connection structures, the range of the force application method and force direction of the micro screw can be expanded, so that the micro screw can be used more flexibly in orthodontic clinics. When the force application method or the force direction needs to be changed At this time, only the accessories on the head of the micro screw body need to be replaced, there is no need to remove the micro screw, and there is no need to re-implant the new micro screw, reducing the number of orthodontic operations and steps.

Injection of anesthetics at the implantation site;

Put an appropriate amount of medical glue in the retention slot;

Specifically, the main body of the microscrew is implanted into the alveolar bone through the threaded part, and the accessory is installed on the head of the main body of the microscrew by means of the mechanical fixing force between the retention groove and the retention block and the chemical retention force of the medical glue. , Use the connecting structure on the accessory to connect the orthodontic traction component. When the force application method or the force direction needs to be changed, the accessory only needs to be removed and replaced with an accessory that meets the requirements. Its structural design is reasonable, and by replacing a variety of accessories, the range of the force method and direction of the orthodontic anchorage microscrews is expanded, so that the orthodontic anchorage microscrews can be more flexibly used in orthodontic clinics and reduce operations. An adverse event of micro-screw fracture.

In the orthodontic process, when the correction method changes and the accessory needs to be replaced, the accessory is directly removed, another suitable accessory is selected, and the same method is used for retention.

Example

Figure 1 shows a schematic structural view of the micro screw body of this embodiment; Figure 2 shows a top view of the micro screw body of this embodiment; Figures 3 to 6 respectively show schematic diagrams of the four accessories of this embodiment Structure diagram

The orthodontic anchorage of the present invention includes microscrews and four accessories, of which,

Micro screws, including:

The material of the main body of the micro screw is tantalum, as shown in Fig. 1 and Fig. 2, it includes a head 1, a neck 2 and a threaded part 3 which are connected in sequence. The end surface of the head 1 is provided with a retention groove 1.1, and the head 1 A ligation hole 1.2 is provided on the side, and the axial direction of the ligation hole 1.2 is perpendicular to the length of the microscrew body, and the ligation hole 1.2 penetrates the head;

Four attachments, each attachment includes a retention block 4 and a connection structure 5. The shape of the retention block 4 fits with the retention slot 1.1. The connection structure 5 is arranged at one end of the retention block 4, and the other end of the retention block 4 is used Inserted in the retention slot 1.1, the connecting structure 5 is used to connect the traction component;

The first accessory is shown in Figure 3. Its connecting structure 5 is a boss. The boss includes a large-diameter end and a small-diameter end. The small-diameter end is connected to the retaining block, and the top surface of the large-diameter end is provided with a cross-shaped groove. The font-shaped groove extends downward from the top surface of the large diameter end to the end surface of one end of the retaining block;

The second accessory is shown in Figure 4, the connecting structure 5 includes an extension rod and a hook, one end of the extension rod is hinged to the retention block, and the hook is installed at the other end of the extension rod;

The third accessory is shown in Figure 5. Its connecting structure 5 is a traction rod, one end of the traction rod is fixedly connected to the retention block, and the other end of the traction rod is provided with a curved plug;

The fourth accessory is shown in Figure 6, and its connecting structure 5 is in the shape of a hat and is buckled on one end of the retaining block to protect the oral mucosa;

In this embodiment, the head 1 of the micro-screw body is a regular hexagonal prism with a side length of 1.25mm, the neck 2 is a smooth cylinder with a diameter of 1.7mm and a length of 2mm, the threaded part 3 is also cylindrical, and the threaded part The free end is the tip, the thread pitch is 0.5mm, the minor diameter of the thread is 1.2mm, the major diameter of the thread is 1.6mm, the thread depth is 0.2mm, the length of the thread 3 is determined according to the actual clinical needs, and the retention groove 1.1 is the depth 1.5 mm cylindrical groove, the side wall of the cylindrical groove is provided with a trapezoidal positioning groove, the positioning groove penetrates the cylindrical groove along the axis of the cylindrical groove, and the diameter of the ligation hole 1.2 is 0.6mm.

In this embodiment, the shape of the retention block 4 fits with the retention groove 1.1, and includes a cylinder and a pair of positioning protrusions arranged on the side of the cylinder. The positioning protrusions are trapezoidal and penetrate along the axis of the cylinder. The side of the cylinder.

The orthodontic anchorage structure of the present invention is reasonable in design, and the range of the force application mode and force direction of the micro screw is expanded by installing accessories with different connection structures, so that the micro screw can be used more flexibly in orthodontic clinics and reduce the number of operations. An adverse event of microscrew fracture.

The present invention also provides an orthodontic method, including the steps:

Injection of anesthetics at the implantation site;

Make the threaded part of the microscrew body deep into the implantation site, and stop when the neck of the microscrew body is completely submerged in the soft tissue;

Put an appropriate amount of medical glue in the retention slot;

When in use, after implanting orthodontic anchorage microscrews, select the appropriate accessories for this treatment stage, and use the mechanical retention force between the retention groove and the retention block to assist with the chemical bonding force of the medical glue to fix the accessories. The head of the microscrew is anchored in the orthodontics, and then the force is loaded according to the clinical needs. When entering the next treatment stage, replace the applicable accessories and fix them in the same way.

The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art.

Claims

A microscrew is characterized in that it comprises a head, a neck and a threaded part which are connected in sequence, the threaded part is used for cutting bone tissue through alveolar bone, and the end surface of the head is provided with a retention groove.
The micro screw according to claim 1, wherein the side surface of the head is provided with a ligation hole, the axial direction of the ligation hole is perpendicular to the length direction of the micro screw body, and the ligation hole penetrates the述头。 Said head.
The micro screw according to claim 1, wherein the retaining groove is a cylindrical groove, and a positioning groove is provided on the side wall of the cylindrical groove, and the positioning groove is along the cylindrical groove. The axial direction of the groove penetrates the cylindrical groove.
The micro screw according to claim 1, wherein the head is a regular hexagonal prism, the neck and the threaded portion are both cylindrical, and the free end of the threaded portion is a tip.
The micro screw according to claim 1, wherein the material of the orthodontic anchor micro screw is tantalum alloy.
An accessory for mounting on the microscrew according to any one of claims 1-5, wherein the accessory includes a retaining block and a connecting structure, and the connecting structure is arranged on the retaining position. One end of the block, the other end of the retention block is used to insert into the retention groove, the shape of the other end of the retention block is adapted to the shape of the retention groove, and the connection The structure is used to connect the traction components.
The accessory according to claim 6, wherein the connecting structure is a boss, the boss includes a large-diameter end and a small-diameter end connected, the small-diameter end is connected to the retaining block, the A cross-shaped groove is provided on the top surface of the large-diameter end, and the cross-shaped groove extends downward from the top surface of the large-diameter end to the end surface of the one end of the retaining block.
The accessory according to claim 6, wherein the connecting structure comprises an extension rod and a hook, one end of the extension rod is hinged to the retention block, and the hook is installed on the other of the extension rod. One end.
The accessory according to claim 6, wherein the connecting structure is a traction rod, one end of the traction rod is fixedly connected to the retention block, and the other end of the traction rod is provided with a cambered plug.
The accessory according to claim 6, wherein the connecting structure is in the shape of a hat and is buckled on the one end of the retaining block to protect the oral mucosa.
An orthodontic anchorage, which is characterized by comprising: the microscrew according to any one of claims 1-5 and the accessory according to any one of claims 6-10.
An orthodontic method using the orthodontic anchor according to claim 11, characterized in that the method comprises the following steps:

Injection of anesthetics at the implantation site;

Make the threaded part of the microscrew body deep into the implantation site, and stop when the neck of the microscrew body is completely submerged in the soft tissue;

Rotate the main body of the microscrew so that the axis of the ligation hole is horizontal;

Put an appropriate amount of medical glue in the retention slot;

Insert the other end of the retaining block into the retaining slot to fix the accessory on the head of the micro screw body;

Connect the orthodontic traction component to the connecting structure at one end of the retaining block.