Dental instrument

Abstract

One aspect of this application provides a dental instrument comprising: a first shell-like body, which is an integral shell forming a cavity for receiving a patient's first dentition, the first shell-like body being configured such that a partial surface of the lingual or labial / buccal side of the first tooth is exposed on the first shell-like body, the first dentition being the maxillary or mandibular dentition; a second shell-like body, which is an integral shell forming a cavity for receiving the patient's second dentition, the second dentition being the opposing dentition of the first dentition; a first anchoring attachment protruding from the first or second shell-like body; a second anchoring attachment mounted on the partial surface of the first tooth exposed on the shell-like body; and an elastic member that mechanically engages with the first and second anchoring attachments to elastically deform, thereby applying an orthodontic force to the first tooth through the second anchoring attachment.

Description

Technical Field

[0001] This application generally relates to a dental instrument, and more particularly to a dental instrument capable of efficiently moving teeth. Background Technology

[0002] Due to their advantages such as ease of use, easy cleaning, and aesthetics, shell-shaped orthodontic appliances are becoming increasingly popular in the field of orthodontic treatment.

[0003] Orthodontic treatment using shell-shaped orthodontic appliances refers to the process of gradually repositioning a patient's teeth from their initial layout to the target tooth layout by wearing a series of shell-shaped orthodontic appliances.

[0004] Shell-shaped orthodontic appliances reposition teeth by using the rebound force generated by the elastic deformation when worn on the patient's teeth.

[0005] To increase the force applied to a tooth, the primary method is to bond attachments to the tooth's surface. The force is then amplified through the interaction between the shell-shaped orthodontic appliance, the tooth, and the attachments. However, the corrective force applied in this way is still relatively weak, thus limiting the efficiency of orthodontic treatment.

[0006] In view of the above, it is necessary to provide a new dental instrument that can efficiently move teeth. Summary of the Invention

[0007] One aspect of this application provides a dental instrument comprising: a first shell-like body, which is an integral shell forming a cavity for receiving a patient's first dentition, the first shell-like body being configured such that a partial surface of the lingual or labial / buccal side of the first tooth is exposed on the first shell-like body, the first dentition being the maxillary or mandibular dentition; a second shell-like body, which is an integral shell forming a cavity for receiving the patient's second dentition, the second dentition being the opposing dentition of the first dentition; a first anchoring attachment protruding from the first or second shell-like body; a second anchoring attachment mounted on the partial surface of the first tooth exposed on the shell-like body; and an elastic member that mechanically engages with the first and second anchoring attachments to elastically deform, thereby applying an orthodontic force to the first tooth through the second anchoring attachment.

[0008] In some implementations, the corrective force is along the mesiodistal direction.

[0009] In some implementations, the corrective force is in the vertical direction.

[0010] In some embodiments, the elastic element is bent into a predetermined shape, and the elastic deformation is a lateral elastic deformation in the direction of extension of the elastic element.

[0011] In some embodiments, the elastic element is bent near the point of engagement with the first anchoring attachment and / or the second anchoring attachment.

[0012] In some embodiments, the first anchoring attachment is adhered to the first or second shell-like body.

[0013] In some embodiments, the second anchoring attachment is adhered to a portion of the surface of the first tooth that protrudes from the first shell-like body.

[0014] In some embodiments, the first anchoring attachment is disposed on the portion of the first shell-like body corresponding to the first tooth, and is located on the same side of the first tooth as the portion of the first shell-like body that protrudes from the lingual or lip / buccal side.

[0015] In some embodiments, a window is provided on the first shell-like body or a notch is provided at the edge, so that a portion of the surface of the first tooth is exposed on the first shell-like body.

[0016] In some embodiments, the first anchoring attachment and / or the second anchoring attachment form a receiving groove, and the end of the elastic member corresponding to the first anchoring attachment and / or the second anchoring attachment is received in the receiving groove.

[0017] In some embodiments, the receiving groove of the first anchoring attachment and / or the second anchoring attachment extends to the surface of the first anchoring attachment and / or the second anchoring attachment away from the tooth surface, such that the elastic element can be mounted in the receiving groove from the side.

[0018] In some embodiments, the elastic element is a spring sheet or a tongue-shaped piece formed by bending a metal wire.

[0019] In some embodiments, the dental instrument further includes a third anchoring attachment, wherein the first and third anchoring attachments are projecting onto the first shell-like body and located on one or both sides of the second anchoring attachment.

[0020] In some embodiments, the first and third anchoring attachments are respectively protruding from the first shell-shaped body and located on both sides of the second anchoring attachment. The elastic element is formed by bending a metal wire, with its two ends inserted into holes on the first and third anchoring attachments respectively. Its middle part is bent to form a U-shaped structure, which is received in a groove recessed on the surface of the second anchoring attachment near the crown. Attached Figure Description

[0021] The above and other features of this application will be further described below with reference to the accompanying drawings and their detailed description. It should be understood that these drawings only illustrate several exemplary embodiments according to this application and should not be considered as limiting the scope of protection of this application. Unless otherwise specified, the drawings are not necessarily to scale, and similar reference numerals denote similar parts.

[0022] Figure 1 A dental instrument worn on a patient's dentition is illustrated in one embodiment of this application.

[0023] Figure 2 Showing Figure 1 The dental instruments shown correspond to the corresponding teeth;

[0024] Figure 3 Showing Figure 1 The fit between the elastic element and the first anchoring accessory is shown.

[0025] Figure 4 The first anchoring attachment in one embodiment of this application is illustrated schematically;

[0026] Figure 5 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application;

[0027] Figure 6 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application;

[0028] Figure 7 schematically shown Figure 6 The fit between the elastic element and the third anchoring accessory is shown.

[0029] Figure 8 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application;

[0030] Figure 9 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application;

[0031] Figure 10 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application;

[0032] Figure 11 The illustration schematically depicts a dental instrument worn on a patient's dentition according to yet another embodiment of this application; and

[0033] Figure 12 A dental instrument worn on a patient's teeth is illustrated in yet another embodiment of this application. Detailed Implementation

[0034] The following detailed description incorporates the accompanying drawings, which form part of this specification. The illustrative embodiments mentioned in the specification and drawings are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art will understand, based on the teachings of this application, that many other embodiments can be employed and various changes can be made to the described embodiments without departing from the spirit and scope of this application. It should be understood that the various aspects of this application illustrated herein can be arranged, substituted, combined, separated, and designed in many different configurations, all of which are within the scope of this application.

[0035] One aspect of this application provides a dental instrument comprising a first shell-shaped body, a second shell-shaped body, a first anchoring attachment, a second anchoring attachment, and an elastic element. The first anchoring attachment is bonded to a partial surface of a first tooth exposed in the first shell-shaped body, and the second anchoring attachment is protruding from the first or second shell-shaped body. The elastic element, through mechanical cooperation with the first and second anchoring attachments, causes elastic deformation, thereby applying an orthodontic force to the first tooth via the second anchoring attachment.

[0036] Please see Figure 1 The image schematically illustrates a dental instrument 100 worn on a patient's dentition in one embodiment of this application.

[0037] The dental instrument 100 includes a shell-shaped body 101, a first anchoring attachment 103, a second anchoring attachment 105, and an elastic element 107.

[0038] The shell-like body 101 is an integral shell that forms a cavity to accommodate the patient's dentition (maxillary or mandibular dentition). The buccal side of the portion of the shell-like body 101 corresponding to the tooth 121 forms a notch 1011 near the root of the tooth 121, so that the buccal surface portion of the tooth 121 near the root is exposed by the shell-like body 101.

[0039] The first anchoring attachment 103 is protrudingly disposed on the buccal side of the portion of the shell-like body 101 corresponding to the tooth 121. The second anchoring attachment 105 is cemented to the surface of the tooth 121 located at the notch 1011.

[0040] The elastic element 107 has a predetermined shape, which is mechanically engaged with the first anchoring attachment 103 and the second anchoring attachment 105 to cause it to elastically deform, thereby applying additional orthodontic force to the tooth 121 through the second anchoring attachment 105.

[0041] Please see Figure 2 It showed Figure 1 The portion of the dental instrument 100 shown corresponds to the tooth 121.

[0042] The elastic element 107 is a spring plate, with its first end detachably housed in a receiving groove of the first anchoring attachment 103 and its second end detachably housed in a receiving groove of the second anchoring attachment 105. The relative positions of the first anchoring attachment 103 and the second anchoring attachment 105 cause the elastic element 107 to elastically deform, thereby applying an additional orthodontic force along the A direction to the tooth 121 through the second anchoring attachment 105.

[0043] Please see Figure 3 It showed Figure 1 The shown shows the fit between the elastic element 107 and the first anchoring attachment 103.

[0044] The elastic member 107 forms a barb 1071 at one end near the first anchoring attachment 103. Correspondingly, the receiving groove 1031 of the first anchoring attachment 103 forms an enlarged portion 1033 near the crown of the tooth to receive the barb 1071, the lateral dimension of which is larger than the other parts of the receiving groove 1031. After the elastic member 107 and the first anchoring attachment 103 are assembled in place, the barb 1071 abuts against the step of the enlarged portion 1033 to prevent the elastic member 107 from dislodging from the first anchoring attachment 103 towards the tooth root.

[0045] In one embodiment, the receiving groove 1031 may extend to the top surface (the surface away from the tooth surface) of the first anchoring attachment 103 to form an opening, so that the elastic member 107 can be installed from the side. In another embodiment, the first anchoring attachment 103 may form an opening only on the surface near the tooth root, and the elastic member 107 is inserted into the receiving groove 1031 from the tooth root to the crown through this opening.

[0046] Please see Figure 4 This is a view of the first anchoring attachment 103 in one embodiment, from the root to the crown.

[0047] The receiving groove 1031 of the first anchoring attachment 103 forms a guide groove 1035 that gradually expands from the inside to the outside near the top surface, so as to facilitate the installation of the elastic member 107.

[0048] exist Figure 1 In the illustrated embodiment, the notch 1011, the first anchoring attachment 103, the second anchoring attachment 105, and the elastic element 107 are disposed on the lip and cheek side. Under the guidance of this application, it can be understood that they can also be disposed on the tongue side.

[0049] exist Figure 1 In the illustrated embodiment, the first anchoring attachment 103 is disposed on the portion of the shell-shaped body 101 corresponding to the tooth 121. Under the guidance of this application, it can be understood that it can also be disposed on other portions of the shell-shaped body 101, for example, it can be disposed on the portion of the shell-shaped body corresponding to the adjacent tooth of the tooth 121.

[0050] Please see Figure 5 The image schematically illustrates a dental instrument 200 according to yet another embodiment of this application.

[0051] A notch 2011 is formed on the buccal side of the portion of the shell-like body 201 corresponding to the tooth 221 near the root of the tooth 221, so that the buccal surface portion of the tooth 221 near the root exposes the shell-like body 201. A first anchoring attachment 203 is protrudingly disposed on the buccal side of the portion of the shell-like body 201 corresponding to the tooth 221. A second anchoring attachment 205 is cemented to the surface of the tooth 221 located at the notch 2011.

[0052] The elastic element 207 is a tongue-shaped piece formed by bending a metal wire (e.g., an archwire commonly used in dentistry). The two ends of the wire are inserted into the two holes of the first anchoring attachment 203, and the tip of the tongue of the elastic element 207 abuts against the side of the second anchoring attachment 205. The relative positions of the first anchoring attachment 203 and the second anchoring attachment 205 cause the elastic element 207 to undergo elastic deformation, applying a corrective force in direction B to the tooth 221 through the second anchoring attachment 205.

[0053] The elastic element 207 is bent at its mating point with the first anchoring attachment 203 and the second anchoring attachment 205. On one hand, this facilitates control over the direction of force application, ensuring it follows the proximal-distal direction as much as possible. On the other hand, this restricts the movement of the elastic element 207, preventing it from disengaging.

[0054] Based on the teachings of this application, it can be understood that Figure 5 The illustrated embodiment can have various variations. For example, the positions of the first anchoring attachment 203 and the second anchoring attachment 205 can be interchanged.

[0055] Please see Figure 6 The image schematically illustrates a dental instrument 300 according to yet another embodiment of this application.

[0056] A notch 3011 is formed on the buccal side of the portion of the shell-like body 301 corresponding to the tooth 321 near the root of the tooth 321, so that the buccal surface portion of the tooth 321 near the root exposes the shell-like body 301. A first anchoring attachment 303 and a second anchoring attachment 305 are respectively protrudingly disposed on the buccal side of the portion of the shell-like body 301 corresponding to the adjacent teeth on both sides of the tooth 321. A third anchoring attachment 307 is cemented to the surface of the tooth 321 located at the notch 3011.

[0057] The elastic element 309 is formed by bending a metal wire. Its first end is inserted into a hole extending in the mesiodistal direction of the first anchoring attachment 303, and its second end, opposite to the first end, is inserted into a hole extending in the mesiodistal direction of the second anchoring attachment 305. The elastic element 309 is bent near the hole to restrict the movement of the elastic element 309 in the mesiodistal direction.

[0058] Please see again. Figure 7 This schematically illustrates the engagement between the elastic element 309 and the third anchoring attachment 307.

[0059] The elastic element 309 bends in the middle toward the root to form a U-shaped structure 3091, which is housed in a groove 3071 with an opening facing the crown on the third anchoring attachment 307.

[0060] exist Figure 6 and Figure 7 In the example shown, the elastic element 309 abuts against the first anchoring attachment 303 by bending at the first anchoring attachment 303, and the U-shaped structure 3091 abuts against the side of the groove 3071 away from the first anchoring attachment 303. The relative position between the first anchoring attachment 303 and the third anchoring attachment 307 causes the elastic element 309 to be compressed along the mesiodistal direction and undergo elastic deformation, thereby applying an orthodontic force along direction C to the tooth 321 through the third anchoring attachment 307.

[0061] Based on the teachings of this application, it can be understood that Figure 6 and Figure 7 The illustrated embodiment can have various variations. For example, the second anchoring attachment 305 may be omitted, and correspondingly, a section on the left side of the U-shaped structure 3091 of the elastic member 309 can be cut off. Another example is that the elastic member may not have the U-shaped structure; instead, it may be bent at the third anchoring attachment 307, abutting against the side of the third anchoring attachment 307 closest to the first anchoring attachment 303. In this case, a groove may be formed on the abutting side of the third anchoring attachment 307, or a protruding blocking feature may be formed on the abutting side away from the tooth surface to prevent the elastic member 309 from dislodging. Yet another example is that a section of the elastic member between the first anchoring attachment 303 and the third anchoring attachment 307 may be pre-bent to a certain arc. When the elastic member is subjected to compressive force, this section undergoes elastic deformation, causing the arc to change. Yet another example is that the holes in the first anchoring attachment 303 and the second anchoring attachment 305 may extend vertically.

[0062] It is understandable that by changing Figure 6 The deformation direction of the elastic element 309 shown can also cause the first anchoring attachment 303 and the second anchoring attachment 305 to exert an upward or downward force on the third anchoring attachment 307 through the elastic element 309.

[0063] Please see Figure 8 The image schematically illustrates a dental instrument 400 in yet another embodiment of this application.

[0064] A window 4011 is formed on the buccal side of the portion of the shell-like body 401 corresponding to the tooth 421 at the crown of the tooth 421, so that the buccal surface portion of the tooth 421 at the crown is exposed above the shell-like body 401. A first anchoring attachment 403 is protrudingly disposed on the buccal side of the portion of the shell-like body 401 corresponding to the tooth 421 near the root, and a second anchoring attachment 405 is cemented to the surface of the tooth 421 located at the window 4011. An elastic member 407 connects the first anchoring attachment 403 and the second anchoring attachment 405. The relative position between the first anchoring attachment 403 and the second anchoring attachment 405 causes the elastic member 407 to elastically deform, and an orthodontic force is applied to the tooth 421 through the second anchoring attachment 405.

[0065] Please see Figure 9 The image schematically illustrates a dental instrument 500 in yet another embodiment of this application.

[0066] Windows 5011 and 5013 are formed on the buccal side of the portion of the shell-like body 501 corresponding to the tooth 521, near the root and crown, respectively, so that the buccal surface portion of the tooth 521 near the root and crown exposes the shell-like body 501. A first anchoring attachment 503 is cemented to the surface of the tooth 521 located at window 5011. A second anchoring attachment 505 protrudes from the buccal side of the portion of the shell-like body 501 corresponding to the adjacent tooth 523 of the tooth 521. An elastic member 511 connects the first anchoring attachment 503 and the second anchoring attachment 505. A third anchoring attachment 507 is cemented to the surface of the tooth 521 located at window 5013. A fourth anchoring attachment 509 protrudes from the buccal side of the portion of the shell-like body 501 corresponding to the adjacent tooth 523 of the tooth 521. The elastic member 513 connects the third anchoring attachment 507 and the fourth anchoring attachment 509.

[0067] The relative positions of the first anchoring attachment 503 and the second anchoring attachment 505 cause elastic deformation of the elastic element 511, applying orthodontic force to the tooth 521 through the second anchoring attachment 505. The relative positions of the third anchoring attachment 507 and the fourth anchoring attachment 509 cause elastic deformation of the elastic element 513, applying orthodontic force to the tooth 521 through the fourth anchoring attachment 509. The orthodontic force can be a mesial or distal force.

[0068] Please see Figure 10 The image schematically illustrates a dental instrument 600 in yet another embodiment of this application.

[0069] Windows 6011 and 6013 are formed on the buccal side of the portion of the shell-like body 601 corresponding to the tooth 621, near the root and crown, respectively, so that the buccal surface portion of the tooth 621 near the root and crown exposes the shell-like body 601. A first anchoring attachment 603 is cemented to the surface of the tooth 621 located at window 6011. A second anchoring attachment 605 protrudes from the buccal side of the portion of the shell-like body 601 corresponding to the distal adjacent tooth 623 of the tooth 621. An elastic member 611 connects the first anchoring attachment 603 and the second anchoring attachment 605. A third anchoring attachment 607 is cemented to the surface of the tooth 621 located at window 6013. A fourth anchoring attachment 609 protrudes from the buccal side of the portion of the shell-like body 601 corresponding to the mesial adjacent tooth 625 of the tooth 621. The elastic member 613 connects the third anchoring attachment 607 and the fourth anchoring attachment 609.

[0070] By configuring the elastic elements in different ways to apply force, different effects can be achieved. For example, if the second anchoring attachment 605 applies a force in the distal direction to the first anchoring attachment 603 through the elastic element 611, and the fourth anchoring attachment 609 applies a force in the distal direction to the third anchoring attachment 607 through the elastic element 613, then the tooth 621 will undergo a distal-distal translation.

[0071] In another embodiment, the first anchoring attachment 603 and the second anchoring attachment 605 can be disposed on the tongue side. By applying force to the first anchoring attachment 603 and the third anchoring attachment 607 through the elastic members 611 and 613, the tooth 621 can be deflected.

[0072] Please see Figure 11 The image schematically illustrates a dental instrument 700 in yet another embodiment of this application.

[0073] A window 7011 is formed on the buccal side of the portion of the shell-like body 701 corresponding to the tooth 721 near the crown, so that the buccal surface portion of the tooth 721 near the crown is exposed above the shell-like body 701. A first anchoring attachment 703 is cemented to the surface of the tooth 721 located at the window 7011, and a second anchoring attachment 705 is protrudingly disposed on the buccal side of the portion of the shell-like body 701 corresponding to the adjacent tooth 723 on the mesial side of the tooth 721. An elastic member 711 connects the first anchoring attachment 703 and the second anchoring attachment 705.

[0074] The third anchoring attachment 707 is protrudingly disposed on the buccal side of the portion of the shell-shaped body 701 corresponding to the distal adjacent tooth 725 of the tooth 721, and the fourth anchoring attachment 709 is protrudingly disposed on the buccal side of the portion of the shell-shaped body 701 corresponding to the distal adjacent tooth 727 of the tooth 725, and the elastic member 713 connects the first anchoring attachment 703, the third anchoring attachment 707 and the fourth anchoring attachment 709.

[0075] Please see Figure 12 The image schematically illustrates a dental instrument 800 in yet another embodiment of this application.

[0076] The dental instrument 800 includes a maxillary shell-shaped body 801 and a mandibular shell-shaped body 811.

[0077] A window 8011 is formed on the buccal side of the portion of the maxillary shell-like body 801 corresponding to the tooth 821 near the crown, so that the buccal surface portion of the tooth 821 near the crown exposes the maxillary shell-like body 801. A first anchoring attachment 803 is cemented to the surface of the tooth 821 located at the window 8011.

[0078] The mandibular shell-like body 811, corresponding to the portion of the tooth 823, has a second anchoring attachment 813 protruding from its buccal side. An elastic element 831 connects the first anchoring attachment 803 and the second anchoring attachment 813. This configuration allows the mandibular dentition to provide mesial or distal thrust to the tooth 823.

[0079] As can be seen from the above, the configuration of anchoring attachments and elastic components can be arbitrarily set according to specific needs to achieve the corresponding orthodontic purpose.

[0080] By using an anchoring attachment mounted on the shell-like body, force is applied to the anchoring attachment installed on the surface of the first tooth through an elastic element. On the one hand, the direction of force applied to the first tooth can be freely configured, and on the other hand, other teeth in the dentition can be used as anchors for the first tooth to strengthen the anchorage.

[0081] In one embodiment, the elastic deformation of the elastic element of this application can be non-axial, that is, its elastic deformation is not along its extension direction, but transverse, i.e., bending deformation.

[0082] In another embodiment, the elastic deformation of the elastic element of this application can also be axial, for example, using a conventional helical spring.

[0083] Although various aspects and embodiments of this application have been disclosed herein, other aspects and embodiments of this application will be apparent to those skilled in the art upon inspiration from this application. The various aspects and embodiments disclosed herein are for illustrative purposes only and not for limiting purposes. The scope and spirit of this application are determined solely by the appended claims.

[0084] Similarly, the diagrams may illustrate exemplary architectures or other configurations of the disclosed methods and systems, which aid in understanding the features and functions that may be included in the disclosed methods and systems. The claims are not limited to the exemplary architectures or configurations shown, and the desired features may be implemented with various alternative architectures and configurations. Furthermore, the order of the blocks given herein with respect to flowcharts, functional descriptions, and method claims should not be limited to various embodiments implemented in the same order to perform the said functions, unless explicitly indicated in the context.

[0085] Unless otherwise expressly stated, the terms and phrases used herein, and their variations thereof, should be interpreted as open-ended rather than restrictive. In some instances, the appearance of extended words and phrases such as “one or more,” “at least,” “but not limited to,” or other similar expressions should not be construed as an intention or necessity to indicate a narrower scope in examples where such extended expressions might not exist.

Claims

1. A dental instrument comprising: The first shell-like body, which is an integral shell, forms a cavity to accommodate the patient's first dentition. The first shell-like body is configured such that a partial surface of the lingual or labial / buccal side of the first tooth is exposed. The first dentition is the maxillary dentition or the mandibular dentition. The second shell-like body, which is a single shell, forms a cavity to accommodate the patient's second dentition, which is the opposing dentition to the first dentition; The first anchoring attachment is protrudingly disposed on the first or second shell-shaped body; A second anchoring attachment is installed on the exposed surface of the first tooth within the shell-like body; and The elastic element, through mechanical cooperation with the first and second anchoring attachments, undergoes elastic deformation, thereby applying orthodontic force to the first tooth via the second anchoring attachment.

2. The dental instrument as claimed in claim 1, characterized in that, The corrective force is along the mesiodistal direction.

3. The dental instrument as described in claim 1, characterized in that, The corrective force is along the vertical direction.

4. The dental instrument as claimed in claim 1, characterized in that, The elastic element is bent into a predetermined shape, and the elastic deformation is a lateral elastic deformation in the extension direction of the elastic element.

5. The dental instrument as claimed in claim 1, characterized in that, The elastic element bends near the point where it mates with the first anchoring attachment and / or the second anchoring attachment.

6. The dental instrument as claimed in claim 1, characterized in that, The first anchoring attachment is adhered to the first or second shell-shaped body.

7. The dental instrument as claimed in claim 1, characterized in that, The second anchoring attachment is bonded to the exposed portion of the first tooth on the surface of the first shell-like body.

8. The dental instrument as claimed in claim 1, characterized in that, The first anchoring attachment is disposed on the portion of the first shell-shaped body corresponding to the first tooth, and is located on the same side of the first tooth that protrudes from the partial surface of the first shell-shaped body, on the lingual or lip / buccal side.

9. The dental instrument as claimed in claim 1, characterized in that, A window is opened on the first shell-like body or a notch is opened at the edge so that a part of the surface of the first tooth is exposed on the first shell-like body.

10. The dental instrument as claimed in claim 1, characterized in that, The first anchoring attachment and / or the second anchoring attachment form a receiving groove, and the end of the elastic member corresponding to the first anchoring attachment and / or the second anchoring attachment is received in the receiving groove.

11. The dental instrument as claimed in claim 10, characterized in that, The receiving groove of the first anchoring attachment and / or the second anchoring attachment extends to the surface of the first anchoring attachment and / or the second anchoring attachment away from the tooth surface, so that the elastic element can be mounted in the receiving groove from the side.

12. The dental instrument as claimed in claim 10, characterized in that, The elastic element is a spring sheet or a tongue-shaped piece formed by bending a metal wire.

13. The dental instrument as claimed in claim 1, characterized in that, It also includes a third anchoring attachment, wherein the first and third anchoring attachments are protruding from the first shell-like body and located on one or both sides of the second anchoring attachment.

14. The dental instrument as claimed in claim 13, characterized in that, The first and third anchoring attachments are respectively protruding from the first shell-shaped body and located on both sides of the second anchoring attachment. The elastic element is formed by bending a metal wire, with its two ends inserted into the holes on the first and third anchoring attachments respectively. Its middle part is bent to form a U-shaped structure, which is received in the groove recessed on the surface of the second anchoring attachment near the crown.

Images