Attachment for effectively reducing the incidence of decrowning and improving the efficiency of overall tooth movement

Abstract

An attachment that effectively reduces the incidence of undercut and improves the overall efficiency of tooth movement includes an attachment body with a gingival portion and a vertical portion. The vertical portion includes a mesial portion located mesially to the crown and a distal portion located distally to the crown. The gingival portion is close to the gingival margin and located slightly below the undercut of the crown. Both the gingival portion and the vertical portion have opposing lingual and buccal surfaces, opposing occlusal and gingival surfaces, and opposing mesial and distal surfaces. The lingual surface is bonded to the tooth surface. The gingival, occlusal, mesial, and distal surfaces are all arc-shaped or spherical. This structural design not only greatly increases the undercut of the tooth but also provides multiple contact areas and a larger force application area with the orthodontic appliance, providing more effective coverage area for mesial or distal tooth movement. This effectively reduces the incidence of undercut and improves the overall efficiency of tooth movement.

Description

Technical Field

[0001] This invention belongs to the field of orthodontic technology, specifically relating to an accessory that effectively reduces the rate of tooth detachment and improves the overall efficiency of tooth movement. Background Technology

[0002] Clear aligners have gained popularity among patients and dentists due to their aesthetic appeal, comfort, and the ability to visualize tooth movement. Their indications have expanded from initial mild malocclusions to more complex cases requiring extraction. Clear aligners are essentially removable appliances; their stable retention and appropriate application area are fundamental to their corrective force and tooth movement. However, due to material limitations, clear aligners are less effective at controlling root movement, focusing more on crown tilting.

[0003] Compared to the anatomical morphology of premolars and molars, canines have a smoother buccal profile and lack undercuts, making it difficult for clear aligners to effectively hold and enclose the crown. This makes them less resistant to dislocation forces during tooth movement. Furthermore, compared to the difference in width between premolars and canines in their coronal planes, the difference in width between canines and lateral incisors is smaller. Combined with the smoother buccal profile of canines, this results in insufficient coverage area for clear aligners to apply force during canine distalization, making it more difficult to apply corrective force and thus resulting in weaker root control. Therefore, in cases involving tooth extraction, canine distalization is more prone to "brace detachment" and tooth tilting, leading to lower overall canine distalization efficiency and difficulty in restoring the original axial tilt after reaching the target position. Similarly, the same problems exist when moving premolars or molars mesially or distally. The device of the present invention can also be used for the overall movement of molars and premolars, reducing the rate of dislodgement while increasing the overall movement efficiency and effectively controlling the original axial tilt. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide an accessory that effectively reduces the incidence of tooth detachment and improves the overall tooth movement efficiency. The present invention can increase tooth undercuts and, during invisible orthodontic treatment, reduces the incidence of tooth detachment and improves the overall tooth movement efficiency by changing the tooth morphology. It effectively controls the axial tilt of the teeth and is characterized by convenient operation, practicality, and high efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An attachment that effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement includes an attachment body. The attachment body has a gingival portion and a vertical portion. The vertical portion includes a mesial portion located mesially to the crown and a distal portion located distally to the crown. The gingival portion is close to the gingival margin and located slightly below the undercut of the crown. Both the gingival portion and the vertical portion have opposing lingual and buccal surfaces, opposing occlusal and gingival surfaces, and opposing mesial and distal surfaces. The lingual surface is bonded to the tooth surface.

[0007] The lingual surface is bonded to the tooth surface; the mesial, distal, and occlusal surfaces are all spherical or elliptical; the gingival surface is an arc shape consistent with the gingival margin of the canine and is set towards the gingiva; its cross-section is similar to an Ω-shape or a semi-circle and its variations, or has a relatively narrow neck.

[0008] Taking the canine as an example, the gingival portion of the attachment body is located gingivally to the crown (slightly below the buccal undercut of the crown), while the vertical portion of the attachment body is located mesially and distally to the crown. The gingival portion of the attachment body is an arc shape consistent with the gingival margin morphology of the premolars and molars. By altering the tooth morphology and increasing the undercut, the rate of detachment of the aligners is reduced. The vertical portion includes a mesial and a distal portion. The mesial portion is near the mesiobuccal junction of the crown, and the distal portion is near the distobuccal junction. By changing the tooth morphology, the effective coverage area of ​​the aligner on the tooth during mesial or distal movement is increased, more effectively expressing the "pushing" force of the clear aligner and effectively improving the overall tooth movement efficiency.

[0009] The vertical portion is located near the buccal junction of the crown when it is located in the mesial region of the crown.

[0010] The vertical portion is located distal to the crown, near the distal buccal junction.

[0011] The occlusal surfaces of the gingival portion and the vertical portion are arc-shaped, and the walls of the occlusal surfaces are perpendicular to or inclined to the tooth surface.

[0012] The attachment body is a U-shaped caterpillar attachment; the gingival surface of the gingival portion and the vertical portion is arc-shaped, and the wall of the gingival surface is perpendicular or inclined to the tooth surface.

[0013] The mesial surface of the vertical portion of the gingival portion is arc-shaped, and the wall of the mesial surface is perpendicular or inclined to the tooth surface.

[0014] The distal surfaces of the gingival portion and the vertical portion are arc-shaped, and the surface of the distal surface is perpendicular to or inclined to the tooth surface.

[0015] The buccal surface of the gingival portion and the vertical portion is curved.

[0016] The U-shaped caterpillar attachment has a neck thickness of 1-1.5 mm and an overall thickness of 3-4 mm.

[0017] The beneficial effects of this invention are:

[0018] Because this invention increases the thickness of the undercut on the buccal side of the tooth, as well as the thickness of the buccal and lingual sides on the mesial and distal sides, it alters the crown morphology, resulting in a larger and more prominent effective coverage area for the tooth and orthodontic appliance on the gingival and mesial and distal sides of the crown. This reduces the incidence of detachment problems while improving the overall mesial and distal movement efficiency of clear aligners in extraction cases, effectively controlling tooth axial inclination. It features simple operation, practicality, high efficiency, effective prevention of tooth detachment, improved overall movement efficiency, and control of tooth axial inclination. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the attachment of the present invention being bonded to a canine.

[0020] Figure 2 This is a schematic diagram of the attachment of the present invention being bonded to the premolar.

[0021] Figure 3 This is a schematic diagram of the attachment of the present invention being bonded to a molar.

[0022] Figure 4 This is a schematic diagram of the attachment of the present invention being bonded to the dental arch.

[0023] Figure 5 This is a schematic diagram of the attachment body.

[0024] Figure 6 for Figure 5 Another perspective illustration.

[0025] In the diagram: 1-Attachment body, 11-Mesial surface, 12-Distal surface, 13-Occlusal surface, 14-Gingival surface, 15-Lingual surface, 16-Buccal surface, 17-Cross-section of attachment body, 2-Tooth, 3-Gingival portion, 4-Vertical portion. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, it will be described below with reference to the accompanying drawings of the embodiments of the present invention. Furthermore, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0027] See Figure 1-2 This embodiment provides an accessory that effectively reduces the rate of tooth detachment and improves the overall efficiency of tooth movement. Figure 1Taking a middle tooth 2 as an example, the attachment body includes an attachment body 1, which has a gingival portion 3 and a vertical portion 4. The attachment body has a mesial surface 11 and a distal surface 12, an occlusal surface 13 and a gingival surface 14, and a lingual surface 15 and a buccal surface 16, all arranged opposite each other. The overall shape of the attachment body is an upright or vertically flipped U-shape. Further, the lingual surface 15 is bonded to the tooth surface, preferably, but not limited to, the buccal surface. Further, the walls of the mesial surface 11 and the distal surface 12, the occlusal surface 13 and the gingival surface 14 are perpendicular to or inclined to the tooth surface. The mesial surface 11, the distal surface 12, the occlusal surface 13, and the gingival surface 14 are circular or elliptical arc-shaped surfaces. Further, the gingival surface 14 is an arc shape consistent with the shape of the gingival margin of the tooth. Further, the cross-section 17 of the attachment body is similar to an Ω or a semicircle, or a variation (deformation) of an Ω or a semicircle.

[0028] The overall thickness of the accessory body 1 is 3-4 mm. In specific implementation, the length, height, and position of the accessory body 1 can be flexibly changed according to the size of the teeth 2, and its overall shape can also be changed to a "J" shape or a variation thereof;

[0029] The accessory body 1 is made of resin, that is, it is bonded with resin and fixed to the tooth surface by the adhesive force between the resin and the teeth.

[0030] An attachment that effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement includes an attachment body 1. The attachment body has a gingival portion and a vertical portion. The vertical portion includes a mesial portion located mesially to the crown and a distal portion located distally to the crown. The gingival portion is close to the gingival margin and located slightly below the undercut of the crown. Both the gingival portion and the vertical portion have opposing lingual and buccal surfaces, opposing occlusal and gingival surfaces, and opposing mesial and distal surfaces. The lingual surface is bonded to the tooth surface.

[0031] The vertical portion, the mesial portion, is located near the buccal junction of the crown when it is located in the mesial part of the crown.

[0032] The vertical portion distal portion is located near the distal buccal junction of the crown when it is located distal to the crown.

[0033] The occlusal surfaces of the gingival portion and the vertical portion are arc-shaped, and the walls of the occlusal surfaces are perpendicular to or inclined to the tooth surface.

[0034] The mesial and distal surfaces are relative terms; in a dental arch, the surface closer to the midline is mesial, and the surface farther from the midline is distal.

[0035] In the vertical portion, the part located near the tooth is called the mesial portion, and the part located far from the tooth is called the distal portion; and in the mesial and distal portions, the surface located near the tooth is the mesial surface, and the surface located far from the tooth is the distal surface.

[0036] The attachment body is a U-shaped caterpillar attachment; the gingival surface of the gingival portion and the vertical portion is arc-shaped, and the wall of the gingival surface is perpendicular or inclined to the tooth surface.

[0037] The mesial surface of the vertical portion of the gingival portion is arc-shaped, and the wall of the mesial surface is perpendicular or inclined to the tooth surface.

[0038] The distal surfaces of the gingival portion and the vertical portion are arc-shaped, and the surface of the distal surface is perpendicular to or inclined to the tooth surface.

[0039] The buccal surfaces of the gingival portion and the vertical portion are curved.

[0040] The U-shaped caterpillar appendage has a neck thickness of 1.0–1.5 mm and an overall thickness of 3–4 mm.

[0041] See Figure 1 , Figure 1 The first image from the left is a buccal view of the canine, the second is a mesial view of the canine, the third is an occlusal view of the canine, and the fourth is a cross-sectional view of the accessory body with several variations.

[0042] See Figure 2 , Figure 2 The first image from the left in the middle is a buccal view of the mandibular first premolar; the second image is a mesial view of the mandibular first premolar; and the third image is an occlusal view of the mandibular first premolar.

[0043] See Figure 3 , Figure 2 The first image from the left is a buccal view of the mandibular first molar, the second is a mesial view of the mandibular first molar, and the third is an occlusal view of the mandibular first molar.

[0044] The working principle of this invention is:

[0045] Taking canines as an example, compared to the anatomical morphology of premolars and molars, the buccal side of canines is smoother and lacks undercuts, making it difficult for clear aligners to effectively hold and enclose the crown. This shape makes them less resistant to dislocation forces during tooth movement. Furthermore, compared to the difference in width between premolars and canines in their coronal plane, the difference in width between canines and lateral incisors is smaller. Combined with the smoother buccal side of canines, this results in insufficient coverage area for clear aligners to apply force during canine distalization, making it more difficult to apply corrective force and thus resulting in weaker root control. Therefore, in cases involving tooth extraction, canine distalization is more prone to "brace detachment" and tooth tilting, leading to lower overall canine distalization efficiency and difficulty in restoring the original axial tilt after reaching the target position. This invention increases the retention force of invisible aligners in the occlusal direction and the "pushing" area in the mesiodistal direction by increasing the undercut on the gingival side and the width of the buccal and lingual surfaces of the teeth, thus allowing the invisible aligners to apply pushing force to the teeth more effectively. One difference from conventional aligners is that the vertical portion of this invention alters the mesial and distal tooth morphology, increasing the pushing surface area near the mesial and distal transition points, which to some extent compensates for deficiencies in tooth morphology during mesiodistal movement. This invention makes the teeth more aligned with the force application principle of invisible aligners, further improving the efficiency of mesiodistal movement and achieving overall tooth movement.

[0046] Furthermore, the embodiments described above are merely some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the scope of this patent application. The U-shaped caterpillar-like attachment body 1 is suitable for teeth with smooth buccal and lingual morphology and small undercuts, and is not limited to canines, but can also be used for premolars and molars. Further, the cross-section of the U-shaped caterpillar-like attachment body 1 is similar to an Ω-shape or a semi-circle, but can be a variation thereof, and is not limited to its narrow neck; further, the overall shape and size of the attachment body 1 can be adjusted according to the shape of the tooth, and is not limited to a U-shape; further, the attachment body 1 can also be used to improve the overall movement efficiency of mesial tooth movement, and is not limited to distal movement.

Claims

1. An attachment that effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, comprising an attachment body, characterized in that, The attachment body has a gingival portion and a vertical portion. The vertical portion includes a mesial portion located mesially to the crown and a distal portion located distally to the crown. The gingival portion is close to the gingival margin and located slightly below the undercut of the crown. Both the gingival portion and the vertical portion have lingual and buccal surfaces, occlusal and gingival surfaces, and mesial and distal surfaces that are arranged opposite to each other. The lingual surface is bonded to the tooth surface.

2. The attachment according to claim 1, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The vertical portion is located near the buccal junction of the crown when it is located in the mesial region of the crown.

3. The attachment according to claim 1, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The vertical portion is located distal to the crown, near the distal buccal junction.

4. The attachment according to claim 1, which effectively reduces the rate of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The occlusal surfaces of the gingival portion and the vertical portion are arc-shaped, and the walls of the occlusal surfaces are perpendicular to or inclined to the tooth surface.

5. The attachment according to claim 1, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The attachment body is a U-shaped caterpillar attachment; the gingival surface of the gingival portion and the vertical portion is arc-shaped, and the wall of the gingival surface is perpendicular or inclined to the tooth surface.

6. The attachment according to claim 1, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The mesial surface of the vertical portion of the gingival portion is arc-shaped, and the wall of the mesial surface is perpendicular or inclined to the tooth surface.

7. The attachment according to claim 1, which effectively reduces the rate of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The distal surfaces of the gingival portion and the vertical portion are arc-shaped, and the surface of the distal surface is perpendicular to or inclined to the tooth surface.

8. The attachment according to claim 1, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The buccal surfaces of the gingival portion and the vertical portion are curved.

9. The attachment according to claim 5, which effectively reduces the incidence of tooth detachment and improves the overall efficiency of tooth movement, is characterized in that... The U-shaped caterpillar appendage has a neck thickness of 1.0–1.5 mm and an overall thickness of 3–4 mm.

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