Shell-shaped appliance set and shell-shaped appliance

Abstract

The utility model discloses a shell-shaped appliance set and a shell-shaped appliance, after the shell-shaped appliance in the previous step corrects teeth, the shell-shaped appliance in the next step is worn on the teeth corrected in the previous step; the shell-shaped appliance in the previous step and the shell-shaped appliance in the next step are both provided with cavities corresponding to accessories on teeth; wherein at least one cavity of the shell-shaped appliance in the next step is configured in the way that at least part of the size of the anchorage area of the cavity is enlarged in the action direction. By adopting the scheme, when the shell-shaped appliance in the next step is identified to have the non-designed anchorage force, the cavity with the non-designed anchorage force is subjected to at least partial size amplification, and the contact between the shell-shaped appliance and the tooth accessory at the cavity is reduced or avoided, so that the anchorage regulation and control on part of teeth are realized; therefore, anchorage weakening or anchorage transfer is achieved, and tedious clinical operations such as grinding and re-bonding of accessories are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the tooth correction field especially, a kind of shell-shaped appliance set and shell-shaped appliance. BACKGROUND

[0002] In clinical orthodontic industry, bracketless shell-shaped dental instrument is used for more and more tooth correction, and generally needs multiple shell-shaped dental instruments to correct teeth step by step. The shell-shaped appliance accommodates teeth to achieve the movement of target teeth from the first position to the second position, and usually with various types of attachments bonded on the teeth, which are used to assist the shell-shaped appliance to apply force on the teeth.

[0003] Since the shell-shaped appliance is a whole, while achieving the force on the target tooth, the reaction force is transmitted to the teeth beside it through the shell-shaped appliance, forming the anchorage force. This anchorage force is usually non-design force, so it will form certain side effects, such as non-design tooth movement of anchorage teeth, or reciprocating movement of anchorage teeth.

[0004] To reduce the influence of anchorage force, it is common in clinical practice to grind off the attachments on the teeth in the mouth of the patient during part of the correction stage to make the attachments not work, reduce the influence of anchorage force, and then re-bond the attachments to make the attachments assist in applying force. This method has a relatively cumbersome clinical operation, and the doctor and patient experience is not good. SUMMARY

[0005] The technical problem to be solved by the utility model is to overcome the defect of non-design anchorage force of the shell-shaped appliance in the prior art, and to provide a shell-shaped appliance set and shell-shaped appliance.

[0006] The utility model solves the above technical problems by the following technical solutions:

[0007] A shell-shaped appliance set, the shell-shaped appliance set includes multiple shell-shaped appliances worn on teeth step by step, among the multiple shell-shaped appliances, after the shell-shaped appliance of the current step is completed, the shell-shaped appliance of the next step is worn on the teeth after the previous step of correction. The shell-shaped appliance of the previous step and the shell-shaped appliance of the next step both have cavities corresponding to the attachments on the same tooth. Among them, at least one set of adjacent shell-shaped appliances has the following relationship: the cavity volume of the shell-shaped appliance of the next step is greater than the cavity volume of the shell-shaped appliance of the previous step.

[0008] In the present solution, the cavity volume of the shell-shaped appliance in the next step can be configured to be larger than the cavity volume of the shell-shaped appliance in the previous step, so that when non-design anchorage force is identified to appear on the shell-shaped appliance in the next step, the enlarged cavity volume can reduce or avoid the contact of the shell-shaped appliance with the dental attachment at the cavity, thereby achieving anchorage adjustment control on part of the teeth to achieve anchorage weakening or anchorage transfer, and avoiding tedious clinical operations such as grinding and reattaching of the attachment.

[0009] Preferably, the design misalignment amount of the cavity of the shell-shaped appliance in the next step and the attachment is greater than the design misalignment amount of the cavity of the shell-shaped appliance in the previous step.

[0010] Preferably, the cavity of the shell-shaped appliance in the next step can completely accommodate the cavity of the shell-shaped appliance in the previous step.

[0011] Preferably, the shell-shaped appliance set is used for distal movement of the molar, and the part of the cavity volume of the shell-shaped appliance in the next step that is larger than the cavity volume of the shell-shaped appliance in the previous step is located at least in the distal direction of the shell-shaped appliance.

[0012] In the present solution, in the process of distal movement of the molar, after the treatment of the shell-shaped appliance in the previous step is completed, the target tooth in the previous step moves in the distal direction, and the attachment on the tooth moves in the distal direction with the tooth; by increasing the cavity volume of the shell-shaped appliance in the next step in the distal direction relative to the cavity volume of the shell-shaped appliance in the previous step, the anchorage force exerted by the shell-shaped appliance in the next step on the target tooth in the previous step can be weakened and transferred, thereby avoiding affecting the treatment effect of the target tooth in the previous step.

[0013] Preferably, the shell-shaped appliance set is used for deep overbite extraction and retraction of the front teeth, and the part of the cavity volume of the shell-shaped appliance in the next step that is larger than the cavity volume of the shell-shaped appliance in the previous step is located at least in the direction away from the jaw plane of the shell-shaped appliance.

[0014] In the present solution, in the process of deep overbite extraction and retraction of the front teeth, after the treatment of the shell-shaped appliance in the previous step is completed, the target tooth in the previous step retracts in the direction away from the jaw plane, and the attachment on the tooth moves in the direction away from the jaw plane with the tooth; by increasing the cavity volume of the shell-shaped appliance in the next step in the position away from the jaw plane relative to the cavity volume of the shell-shaped appliance in the previous step, the anchorage force exerted by the shell-shaped appliance in the next step on the target tooth in the previous step can be weakened and transferred, thereby avoiding affecting the treatment effect of the target tooth in the previous step.

[0015] Preferably, the tooth corresponding to the cavity is the target tooth in the previous step and the anchorage tooth in the next step.

[0016] A shell-shaped appliance set, comprising a plurality of shell-shaped appliances to be worn on teeth step by step,

[0017] In the plurality of shell-shaped appliances, after the shell-shaped appliance of a current step is worn on teeth and the orthodontic treatment is completed, the shell-shaped appliance of a next step is worn on the teeth after the orthodontic treatment of the previous step; the shell-shaped appliances of the previous step and the next step each have a cavity corresponding to an attachment on the teeth.

[0018] At least one cavity of the shell-shaped appliance of the next step of at least one step is configured such that at least part of the size of the anchorage area of the cavity is enlarged in the action direction.

[0019] In the present solution, when it is identified that a non-design anchorage force will appear on the shell-shaped appliance of the next step, the contact between the shell-shaped appliance and the attachment on the teeth at the cavity where the non-design anchorage force will appear is reduced or avoided by at least partially enlarging the size of the cavity, thereby achieving anchorage adjustment control of part of the teeth to achieve anchorage weakening or anchorage transfer, and avoiding tedious clinical operations such as grinding and reattaching of the attachment.

[0020] Preferably, the shell-shaped appliance of the previous step has a cavity that contacts and exerts a force on the attachment on the teeth, and the cavity in the shell-shaped appliance of the previous step that exerts a force corresponds to the enlarged cavity of the shell-shaped appliance of the next step.

[0021] In the present solution, the enlarged cavity of the shell-shaped appliance of the next step is for the cavity of the previous step that exerts a force, so as to avoid affecting the orthodontic treatment effect of the previous step.

[0022] Preferably, at least one action surface of the anchorage area of the cavity is offset and enlarged relative to the attachment on the teeth.

[0023] In the present solution, at least one action surface of the anchorage area of the cavity can be enlarged according to the needs of the orthodontic treatment, such as the overall needs of the anchorage force, so as to both reduce the anchorage weakening of the cavity where the non-design anchorage force appears and provide sufficient anchorage force to achieve the current orthodontic treatment needs.

[0024] Preferably, the anchorage area of the cavity has a plurality of offset and enlarged action surfaces, and the plurality of action surfaces have the same offset and enlarged amount or different offset and enlarged amounts.

[0025] In the present solution, by setting different offset distances, different adjustments of the target anchorage force can be achieved.

[0026] Preferably, the size of the cavity is enlarged as a whole.

[0027] In the present solution, the size of the cavity is enlarged as a whole to weaken or avoid the anchorage force.

[0028] Preferably, the cavity is enlarged as a whole in three spatial directions, and the enlargement in the three spatial directions is equal or unequal.

[0029] In the present solution, by setting unequal enlargement in three directions, different adjustments of the target anchorage tooth force can be achieved.

[0030] Preferably, the enlarged part of the anchorage area of the cavity has an offset of not less than 0.1 mm.

[0031] Preferably, the enlargement of the cavity is negatively related to the anchorage force provided by other anchorage teeth.

[0032] In the present solution, if the anchorage force provided by other anchorage teeth is sufficient, the cavity can be enlarged to a larger extent so that the cavity is completely not in contact with the dental attachment. If the anchorage force provided by other anchorage teeth is insufficient, the cavity can be enlarged to a smaller extent so that the cavity can assist in providing part of the anchorage force.

[0033] Preferably, the shell-shaped appliance of the next step has a plurality of enlarged cavities, and the cavity near the target force tooth has a larger offset than the cavity far from the target force tooth.

[0034] In the present solution, by the above configuration, reasonable adjustment of the anchorage force can be achieved.

[0035] Preferably, the tooth corresponding to the cavity is the target tooth in the previous step and the anchorage tooth in the next step.

[0036] Preferably, the shell-shaped appliance set is used for distal movement of the molar, the shell-shaped appliance of the previous step is used for distal movement of the terminal tooth, the shell-shaped appliance of the next step is used for distal movement of the middle tooth, and the enlarged cavity of the shell-shaped appliance of the next step includes a cavity corresponding to the terminal tooth attachment.

[0037] Preferably, the enlarged surface of the cavity includes an action surface close to the distal direction.

[0038] Preferably, the enlargement of the cavity at the action surface is 1.1-1.2, or the overall enlargement of the cavity is 1.1-1.2.

[0039] Preferably, the shell-shaped appliance set is used for deep overbite extraction and incisor retraction and pressure reduction, the shell-shaped appliance of the previous step is used for pressure reduction of the cuspid, the shell-shaped appliance of the next step is used for pressure reduction of the incisor, and the enlarged cavity of the shell-shaped appliance of the next step includes a cavity corresponding to the cuspid tooth attachment.

[0040] Preferably, the enlarged surface of the cavity comprises an active surface close to the plane of the jaw.

[0041] A shell-shaped appliance having cavities corresponding to attachments on teeth, at least one cavity of the shell-shaped appliance being configured such that at least part of the anchorage area of the cavity is enlarged in the direction of action.

[0042] In the present solution, the anchorage adjustment control of part of the teeth can be realized to achieve anchorage weakening or anchorage transfer, and the tedious clinical operations such as grinding and re-bonding of the attachments can be avoided.

[0043] A design method of a shell-shaped appliance, the design method of the shell-shaped appliance comprising:

[0044] S10: confirming a tooth movement mode and designing an attachment arrangement on teeth;

[0045] S20: identifying a non-design anchorage condition of an anchorage area of a cavity;

[0046] S30: enlarging at least part of the size of the anchorage area of the cavity when the non-design anchorage is large.

[0047] Preferably, the design method of the shell-shaped appliance further comprises:

[0048] S40: restoring the original size of the anchorage area of the cavity when the non-design anchorage is restored to be small.

[0049] Preferably, in S30, the enlarging of at least part of the size of the anchorage area of the cavity comprises:

[0050] S31: determining a tooth position requiring enlargement;

[0051] S32: determining a cavity requiring enlargement;

[0052] S33: determining an enlargement mode of the cavity;

[0053] S34: determining a step number of the cavity requiring enlargement.

[0054] The positive progress effect of the present utility model lies in: when it is identified that a non-design anchorage force will appear on the shell-shaped appliance of the next step, at least part of the size of the cavity where the non-design anchorage force will appear is enlarged, the contact of the shell-shaped appliance with the tooth attachment at the cavity is reduced or avoided, the anchorage adjustment control of part of the teeth is realized to achieve anchorage weakening or anchorage transfer, and the tedious clinical operations such as grinding and re-bonding of the attachments can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1A schematic diagram showing the accessory provided in this embodiment of the present invention normally disposed in the cavity of the shell-shaped orthodontic appliance;

[0056] Figure 2 A schematic diagram from another perspective showing the accessory provided in this embodiment of the present invention normally disposed in the cavity of the shell-shaped orthodontic appliance;

[0057] Figure 3 A schematic diagram of an accessory provided in an embodiment of the present invention disposed in the cavity of a shell-shaped orthodontic appliance, the accessory being subjected to a leftward support force applied by the cavity;

[0058] Figure 4 for Figure 3 A schematic diagram showing the local offset of the working surface of the central cavity;

[0059] Figure 5 for Figure 3 A magnified schematic diagram of the central cavity;

[0060] Figure 6 A schematic diagram of an accessory provided in an embodiment of the present invention disposed in the cavity of a shell-shaped orthodontic appliance, wherein the accessory is subjected to a downward-sloping support force applied by the cavity;

[0061] Figure 7 for Figure 6 A schematic diagram showing the local offset of the working surface of the central cavity;

[0062] Figure 8 for Figure 6 A magnified schematic diagram of the central cavity;

[0063] Figure 9 This is a magnified view of the cavity from another perspective.

[0064] Figure 10 This diagram illustrates the relationship between the cavity and the tooth attachments during the distalization stage of molar distalization, with the target force and resistance force represented by hollow arrows.

[0065] Figure 11 This is a diagram without magnification of the cavity of the distal molar during molar distalization, when the distal molar is in place and the mid-tooth is distalized. The target force and the resistance force 1 and resistance force 2 are represented by hollow arrows.

[0066] Figure 12 This is a magnified diagram of the cavity of the distal molar during molar distalization, when the distal molar is in place and the mid-tooth is distalized. The target force and the resistance force 1 and resistance force 2 are represented by hollow arrows.

[0067] Figure 13 A schematic diagram showing an enlarged cavity volume provided for an embodiment of this utility model;

[0068] Figure 14 Another schematic diagram showing the enlarged cavity volume provided for an embodiment of this utility model;

[0069] Figure 15 This is a schematic diagram illustrating a design method for a shell-shaped orthodontic appliance provided in an embodiment of the present invention.

[0070] Reference Signs List

[0071] Teeth 10, terminal teeth 11, mid-segment teeth 12, anterior teeth 13, shell-shaped appliance 20, cavity 21, attachments 30, anterior cavity 211, posterior cavity 212, enlarged portion P, distal direction X, occlusal plane S. Detailed Implementation

[0072] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0073] Example 1

[0074] This embodiment provides a shell-shaped orthodontic appliance kit, comprising multiple shell-shaped appliances 20 that are progressively worn onto the teeth 10. For a given treatment cycle of the orthodontic treatment of the teeth 10, multiple shell-shaped appliances 20 are typically used to accommodate the orthodontic needs of different stages. These multiple shell-shaped appliances 20 are progressively worn onto the teeth 10 according to the different stages of the orthodontic treatment. For example... Figure 1 and Figure 2 The diagram shows the normal state of the cavity 21 on the shell-shaped orthodontic appliance 20 and the attachment 30 on the tooth 10 when the shell-shaped orthodontic appliance 20 is worn on the tooth 10.

[0075] In a plurality of shell-shaped orthodontic appliances 20, after the previous shell-shaped orthodontic appliance 20 has been used to treat the tooth 10, the next shell-shaped orthodontic appliance 20 is worn on the tooth 10 after the previous treatment. Both the previous and the next shell-shaped orthodontic appliances 20 have cavities 21 corresponding to attachments 30 on the tooth 10; wherein, the cavity 21 corresponds to the attachment 30 on the tooth 10, which can be understood as one or more attachments 30 being disposed on the tooth 10, and the cavity 21 on the shell-shaped orthodontic appliance 20 generally corresponds one-to-one with these attachments 30 on the tooth 10, the position of the cavity 21 is consistent with the corresponding attachment 30, and the cavity 21 can accommodate the attachment 30 in a manner that is in contact with, does not contact with, or partially contacts the attachment 30.

[0076] Among them, such as Figures 4-5 , Figures 7-8 , Figure 9 and Figure 12As shown, at least one cavity 21 of the shell-shaped orthodontic appliance 20 in at least one subsequent step is configured such that at least a portion of the size of the anchorage region of the cavity 21 is enlarged in the direction of action. The area within the cavity 21 capable of providing force to the attachment 30 forms the anchorage region; this direction of action can be understood as the direction in which the cavity 21 would apply force, such as an anchorage force, to the attachment 30 when the shell-shaped orthodontic appliance 20 in the subsequent step is not enlarged.

[0077] When it is identified that the shell-shaped orthodontic appliance 20 will apply undesigned anchorage force to the attachment 30 of the target anchorage tooth in the next step, the contact between the shell-shaped orthodontic appliance 20 and the tooth attachment 30 at the cavity 21 where the undesigned anchorage force will occur is reduced or avoided by enlarging at least a portion of the size of the cavity 21. For example... Figure 3 and Figure 6 As shown, the cavity 21 of the shell-shaped orthodontic appliance 20 will apply leftward and tilted leftward and downward anchoring forces to the attachment 30 of the target anchorage tooth, respectively. Figures 4-5 , Figures 7-8 and Figure 9 As shown, a portion of the cavity 21 is enlarged to allow for anchorage adjustment and control of some teeth 10, enabling anchorage reduction or transfer, and avoiding cumbersome clinical procedures such as grinding and re-bonding of attachments 30. It is understood that each step of the shell appliance 20 corresponds to a target tooth 10 for force application, and the enlarged cavity 21 in the shell appliance 20 of the subsequent step is not the target tooth 10 for force application in that stage.

[0078] In practice, the enlargement of cavity 21 can be achieved through offsetting or overall enlargement. When the offset is small, or when there is local offset enlargement, the enlarged cavity 21 and the corresponding attachment 30 on the tooth 10 are in contact, but the contact is smaller than that before enlargement. This effectively reduces the anchorage force on the target anchorage tooth, and some of the anchorage force is transferred to other unenlarged anchorage teeth. When the offset is large, or when the cavity 21 is offset and enlarged as a whole, the enlarged cavity 21 and attachment 30 are basically not in contact. The attachment 30 on the target anchorage tooth becomes ineffective, equivalent to the attachment 30 being ground away. At this time, the contact between the shell-shaped appliance 20 and the rounded tooth 10 will be greatly reduced, the anchorage force on the target anchorage tooth will be greatly reduced, and more of the anchorage force will be transferred to other unenlarged anchorage teeth.

[0079] Furthermore, it can be understood that the enlargement method of the cavity 21 of the shell-shaped orthodontic appliance 20 described above can be applied to any scenario in which undesigned anchorage occurs. Specifically, it is possible to first identify which tooth 10 will have undesigned anchorage and take that tooth 10 as the target anchorage tooth. By enlarging at least part of the size of the cavity 21 of the target anchorage tooth, the contact between the cavity 21 and the target anchorage tooth is weakened or eliminated, thereby weakening or eliminating the anchorage.

[0080] As an applicable scenario, for shell-shaped orthodontic appliances 20 used in two adjacent stages, the shell-shaped orthodontic appliance 20 in the previous stage has a cavity 21 that contacts and applies force to the attachment 30 on the tooth 10. The cavity 21 in the previous shell-shaped orthodontic appliance 20 that applies force corresponds to the enlarged cavity 21 in the shell-shaped orthodontic appliance 20 in the subsequent stage. The enlarged cavity 21 in the shell-shaped orthodontic appliance 20 in the subsequent stage is designed to address the cavity 21 that applies force in the previous stage, thus avoiding any impact on the orthodontic effect of the previous stage. Alternatively, in a treatment cycle with multiple treatment stages according to time, the tooth 10 corresponding to the cavity 21 is used as the target force-applying tooth 10 in a certain previous stage and as an anchor tooth providing anchorage force in a certain subsequent stage.

[0081] Understandably, in two adjacent stages, the teeth 10 being treated in the previous shell-shaped appliance 20 and the teeth 10 being treated in the subsequent shell-shaped appliance 20 are different, that is, the target force-applying teeth 10 are different. If the target force-applying tooth 10 of the previous shell-shaped appliance 20 is used as the anchor tooth of the subsequent shell-shaped appliance 20, it may affect the treatment effect of the previous stage. However, by using the cavity 21 in the previous shell-shaped appliance 20 corresponding to the target force-applying tooth 10 as an enlarged cavity 21 in the subsequent shell-shaped appliance 20, the treatment effect of the previous stage can be avoided.

[0082] As one implementation method for amplifying cavity 21, such as Figure 4 and Figure 7 As shown, at least one surface of the anchorage region of cavity 21 is offset and enlarged relative to attachment 30 on tooth 10. This surface is the surface identified as where anchorage forces will be generated. At least one surface of the anchorage region of cavity 21 can be enlarged according to the orthodontic needs of tooth 10, such as the overall requirement for anchorage force, thereby both reducing anchorage weakening of cavity 21 due to undesigned anchorage forces and providing sufficient anchorage force to meet current orthodontic needs.

[0083] like Figure 3 As shown, cavity 21 applies a leftward supporting force to attachment 30, and the right side of cavity 21 forms a supporting region; as Figure 4 As shown, the right side of cavity 21 is offset and enlarged to reduce the contact between cavity 21 and accessory 30. Figure 6As shown, cavity 21 applies a downward-sloping, left-facing support force to attachment 30, with the right and top surfaces of cavity 21 forming a support region; as Figure 7 As shown, the right side and top surface of the cavity 21 are offset and enlarged to reduce the contact between the cavity 21 and the accessory 30.

[0084] Furthermore, when the anchorage region of cavity 21 has multiple offset amplification surfaces, these surfaces may have the same offset amplification amount or different offset amplification amounts. By setting different offset distances, different adjustments to the force on the target anchorage tooth can be achieved. Specifically, for Figure 6 The support applied to the attachment 30 by the cavity 21 shown can cause the right side and top side to deviate from the force-bearing surface of the attachment 30 by the same amount of magnification, or they can deviate by different amounts of magnification.

[0085] As another implementation method for amplifying cavity 21, such as Figure 5 and Figure 7 As shown, the dimensions of cavity 21 are enlarged as a whole, thereby reducing or avoiding the support force.

[0086] like Figure 3 As shown, cavity 21 applies a leftward supporting force to attachment 30, and the right side of cavity 21 forms a supporting region; as Figure 5 As shown, the cavity 21 is shifted and enlarged as a whole, reducing the contact between the right side of the cavity 21 and the accessory 30. For example... Figure 6 As shown, cavity 21 applies a downward-sloping, left-facing support force to attachment 30, with the right and top surfaces of cavity 21 forming a support region; as Figure 8 As shown, the cavity 21 is offset and enlarged as a whole to reduce the contact between the right side and top surface of the cavity 21 and the attachment 30.

[0087] Furthermore, when cavity 21 is enlarged as a whole, cavity 21 can be enlarged in three spatial directions, with the enlargement amount being equal or unequal in the three spatial directions. By setting unequal enlargements in the three directions, different adjustments to the force on the target anchoring tooth can be achieved. It can be understood that the three spatial directions can be three perpendicular directions, and at least one of these directions is the direction in which the force is applied.

[0088] Preferably, for the above-mentioned magnification by offset and overall magnification, the magnification offset of the magnified portion in the support region of the cavity 21 is not less than 0.1 mm. Specifically, the spatial positional offset distance of the magnified local or overall action surface of the cavity 21 relative to the unmagnified cavity 21 is not less than 0.1 mm.

[0089] The amplification of cavity 21 is negatively correlated with the anchorage force provided by other anchorage teeth. If the anchorage force provided by other anchorage teeth is sufficient, the amplification of cavity 21 can be larger, so that cavity 21 does not contact tooth attachment 30 at all. If the anchorage force provided by other anchorage teeth is insufficient, the amplification of cavity 21 can be smaller, so that cavity 21 can assist in providing some anchorage force.

[0090] In practice, the shell-shaped appliance 20 in the later step may have multiple enlarged cavities 21. In this case, the enlargement offset of the cavity 21 closer to the target tooth is greater than that of the cavity 21 farther away from the target tooth. This configuration allows for different forms of enlargement, thereby achieving a reasonable adjustment of the anchorage force.

[0091] The tooth corresponding to cavity 21 is the target tooth in the previous orthodontic step and the anchorage tooth in the subsequent orthodontic step. The various structural features of the shell-shaped orthodontic appliance set provided above can be combined according to actual conditions. The following embodiments provide specific applications in the treatment of molar distalization, deep overbite extraction, and intrusion of anterior teeth 13, but the scope of protection of this utility model should not be limited to the following embodiments.

[0092] like Figure 10 , Figure 11 and Figure 12 As shown, the shell-shaped orthodontic appliance assembly is used for distalization of molars. The shell-shaped appliance 20 in the previous step is used for distalization of the distal tooth 11, and the shell-shaped appliance 20 in the subsequent step is used for distalization of the mid-tooth 12. The enlarged cavity 21 of the shell-shaped appliance 20 in the subsequent step includes a cavity 21 corresponding to the attachment 30 of the distal tooth 11. This distal tooth 11 is the target tooth in the previous step and the anchorage tooth in the subsequent step. Preferably, the enlarged surface of the cavity 21 includes an action surface close to the distal direction.

[0093] In orthodontic treatment involving distalization of molars, attachment 30 needs to be bonded to the molars to assist in the distalization process. Figures 10-12 The rectangular attachment 30 shown is used to obtain interdental space. Typically, the distal tooth 11 is displaced to a certain position and sufficient space is created before the mid-tooth 12 is displaced. During the mid-tooth 12 displacement stage, the distal tooth 11 acts as an anchor tooth, experiencing anchoring forces that cause it to tend to mesialize. The attachment 30 on it amplifies this tendency, leading to the side effect of reciprocating motion in tooth 10. If the cavity 21 of the attachment 30 is enlarged at this point, the anchoring forces on the distal tooth 11 will be significantly reduced, and part of the anchoring force will be transferred to the anterior tooth 13. When further displacement of the distal tooth 11 is needed, the enlarged cavity 21 of the attachment 30 can be removed, allowing it to assist in the force-bearing displacement of tooth 10. In this configuration, the distal tooth 11 initially serves as the target tooth for force application and subsequently as an anchor tooth.

[0094] Furthermore, orthodontic treatment for molar distalization may include the following steps:

[0095] S110: Confirm the distalization of the molar and attach attachment 30 to tooth 10.

[0096] S120: Distal repositioning of at least one terminal tooth. For example... Figure 10 As shown, distalization of the terminal tooth 11 is performed; attachments 30 are bonded to the terminal tooth 11, mid-tooth 12 and anterior tooth 13, wherein the shell-shaped orthodontic appliance 20 applies a target force to the attachments 30 of the terminal tooth 11 to the left through the cavity 21 of the terminal tooth 11, and the cavity 21 of the mid-tooth 12 and anterior tooth 13 provides support force, which is directed to the right.

[0097] S130: After the tooth is moved to a certain position, the cavity 21 corresponding to the appendage 30 of the distal tooth 11 is enlarged, and at the same time, the mid-segment tooth 12 in the mesial direction is designed to be moved distally. For example... Figure 11 As shown, after the distal tooth 11 moves into position, the mid-tooth 12 moves distally. At this time, the cavity 21 of the mid-tooth 12 applies a leftward target force to the attachment 30 of the mid-tooth 12. Since the cavity 21 of the attachment 30 of the distal tooth 11 is not enlarged, the left side of the cavity 21 of the distal tooth 11 contacts the attachment 30 of the distal tooth 11, and the left side of the cavity 21 of the anterior tooth 13 also contacts the attachment 30 of the anterior tooth 13, providing rightward support forces respectively. The rightward support force provided by the cavity 21 of the distal tooth 11 causes the distal tooth 11 to reciprocate. Figure 12 As shown, the cavity 21 of the appendix 30 of the terminal tooth 11 is enlarged, and the contact between the left side of the cavity 21 of the terminal tooth 11 and the appendix 30 of the terminal tooth 11 is weakened. The support force is mainly provided by the cavity 21 of the anterior tooth 13, thereby weakening the support force of the cavity 21 of the terminal tooth 11.

[0098] S140: Move the terminal tooth 11 distally again and cancel the magnification of the cavity 21 corresponding to its attachment 30; then repeat the operation until all teeth 10 are moved to the desired position.

[0099] Further, in step S130, the magnification factor of cavity 21 at the working surface is 1.1 to 1.2, or the overall magnification factor of cavity 21 is 1.1 to 1.2. Specifically, if considering that the excessive anchorage force is transferred to the anterior tooth 13, the cavity 21 of the terminal tooth 11 can be magnified slightly, such as at the working surface or as a whole by 1.1 times. At this time, the interference area between cavity 21 and tooth 10 is reduced to a certain extent, thereby weakening the anchorage of the terminal tooth 11. If the anchorage of the anterior tooth 13 is sufficient, the cavity 21 of the terminal tooth 11 can be magnified significantly, such as at the working surface or as a whole by 1.2 times, so that the cavity 21 does not contact the attachment 30 bonded to tooth 10 at all. In this way, the anchorage force of the terminal tooth 11 can be greatly weakened and transferred.

[0100] Furthermore, depending on clinical needs, the two distal teeth can be moved distally simultaneously first. After moving them to a certain point, the mid-segment teeth 12 need to be moved distally. At this point, both distal teeth act as anchorage teeth. Generally, the closer to the target tooth, the greater the anchorage force. Therefore, the attachment 30 on the distal tooth 11, which is closer to the target tooth, is enlarged or shifted more significantly, while the attachment 30 on the more distal distal tooth 11 can be enlarged or shifted less. In addition, because the crown area of ​​some patients' teeth 10 is small, the amount of enlargement or shifting of the attachment 30 is limited. It is necessary to ensure that the cavity 21 of the enlarged attachment 30 remains on the tooth surface. Therefore, the enlargement of the attachment 30 on different teeth 10 also needs to take into account the actual crown condition.

[0101] The shell-shaped appliance assembly is used for deep overbite extraction to retract and intrude the anterior teeth 13. The shell-shaped appliance 20 used in the previous step was used to intrude the canines, and the shell-shaped appliance 20 used in the subsequent step is used to intrude the incisors. The enlarged cavity 21 of the subsequent shell-shaped appliance 20 includes a cavity 21 corresponding to the attachment 30 of the canine tooth 10. This canine is the target tooth in the previous step and the anchorage tooth in the subsequent step. Preferably, the enlarged surface of the cavity 21 includes an action surface close to the occlusal plane.

[0102] In the orthodontic treatment of deep overbite with extraction to retract and intrude anterior tooth 13, an attachment 30, such as a rectangular attachment 30, needs to be bonded to the canine for auxiliary distalization force application. When intruding anterior tooth 13, the canine is usually intruded first. The cavity 21 provides some auxiliary intrusion effect to the attachment 30. After intrusion is complete, the incisor is then intruded. At this point, the canine acts as the main anchorage and is subjected to elongation force, which carries the risk of repetitive movements. Enlarging the cavity 21 of attachment 30 at this stage can reduce the anchorage force and transfer some of the anchorage force to the posterior teeth. After the incisor is intruded, the enlargement of the cavity 21 of attachment 30 is removed, and the cavity 21 of attachment 30 then provides auxiliary intrusion and distalization. This process is repeated until tooth 10 reaches the desired position.

[0103] Example 2

[0104] This embodiment provides a shell-shaped orthodontic appliance kit, which is the same as the shell-shaped orthodontic appliance kit in Embodiment 1. The shell-shaped orthodontic appliance kit in this embodiment includes multiple shell-shaped orthodontic appliances 20 that are progressively worn on the teeth. Among the multiple shell-shaped orthodontic appliances 20, after the previous shell-shaped orthodontic appliance 20 has completed the orthodontic treatment of the teeth, the next shell-shaped orthodontic appliance 20 is worn on the teeth after the previous treatment. Both the previous and the next shell-shaped orthodontic appliances 20 have a cavity 21 that corresponds to the attachment 30 on the same tooth.

[0105] In this embodiment, as Figure 13 and Figure 14 As shown, at least one set of adjacent shell-shaped appliances has the following relationship: the volume of the cavity 21 of the subsequent shell-shaped appliance 20 is larger than the volume of the cavity 21 of the preceding shell-shaped appliance 20. The volume of the cavity 21 of the subsequent shell-shaped appliance 20 can be configured to be larger than that of the preceding shell-shaped appliance 20. Therefore, when an undesigned anchorage force is identified on the subsequent shell-shaped appliance 20, the enlarged cavity 21 volume can reduce or prevent contact between the shell-shaped appliance 20 and the dental attachment 30 at that cavity 21. This allows for anchorage adjustment and control of some teeth, achieving anchorage reduction or transfer, and avoiding cumbersome clinical procedures such as grinding and re-bonding of the attachment 30. The tooth corresponding to the cavity 21 is the target tooth in the preceding treatment and the anchorage tooth in the subsequent treatment.

[0106] The design misalignment between the cavity 21 and accessory 30 of the subsequent shell-shaped orthodontic appliance 20 is greater than that of the previous shell-shaped orthodontic appliance 20. Therefore, compared to the cavity 21 of the previous shell-shaped orthodontic appliance 20, the cavity 21 and accessory 30 of the subsequent shell-shaped orthodontic appliance 20 have a larger misalignment volume, reducing or eliminating contact between them.

[0107] The cavity 21 of the subsequent shell appliance 20 can completely accommodate the cavity of the previous shell appliance 20.

[0108] like Figure 13 As shown, the shell-shaped orthodontic appliance set is used for molar distalization. The portion of the cavity 21 of the subsequent shell-shaped appliance 20 that is larger than the cavity 21 of the previous shell-shaped appliance 20 is located at least in the distal X direction of the shell-shaped appliance 20. During molar distalization, after the previous shell-shaped appliance 20 is completed, the target tooth of the previous step moves distally X, and the attachments 30 on the tooth move distally X along with the tooth. By increasing the cavity 21 volume of the subsequent shell-shaped appliance 20 relative to the cavity 21 volume of the previous shell-shaped appliance 20 in the distal X direction, the resistance force exerted by the subsequent shell-shaped appliance 20 on the target tooth of the previous step can be weakened and transferred, thus avoiding affecting the treatment effect of the target tooth of the previous step.

[0109] Specifically, such as Figure 13 As shown in the figure, attachment 30 represents the position after the previous orthodontic step, having moved distally in the X direction. The dashed box represents the previous cavity 211 of the shell-shaped appliance 20, which overlaps with the moved attachment 30. The solid box represents the subsequent cavity 212 of the shell-shaped appliance 20, which is larger in volume than the previous cavity 211. Furthermore, the subsequent cavity 212 has a larger volume portion P, at least in the distal X direction. Figure 13 In the middle, the volume of the second cavity 212 increases in both the distal X direction and the vertical direction.

[0110] like Figure 14 As shown, the shell-shaped appliance set is used for deep overbite extraction to retract and intrude anterior teeth. The volume of the cavity 21 of the subsequent shell-shaped appliance 20 is larger than that of the previous shell-shaped appliance 20, and is located at least in the direction away from the occlusal plane S. During the deep overbite extraction retraction and intrudement of anterior teeth, after the previous shell-shaped appliance 20 is completed, the target tooth of the previous step is retracted inward in a direction away from the occlusal plane S, and the attachments 30 on the tooth move away from the occlusal plane S along with the tooth. By increasing the volume of the cavity 21 of the subsequent shell-shaped appliance 20 relative to the volume of the cavity 21 of the previous shell-shaped appliance 20 in its position away from the occlusal plane S, the resistance force exerted by the subsequent shell-shaped appliance 20 on the target tooth of the previous step can be weakened and transferred, thus avoiding affecting the orthodontic effect of the target tooth of the previous step.

[0111] Specifically, such as Figure 14 As shown in the figure, attachment 30 represents the position after the previous orthodontic step. Attachment 30 has moved away from the occlusal plane S, specifically diagonally upwards to the right. The dashed box represents the anterior cavity 211 of the previous shell-shaped appliance 20, which overlaps with the moved attachment 30. The solid box represents the posterior cavity 212 of the subsequent shell-shaped appliance 20, which is larger in volume than the anterior cavity 211. Furthermore, the posterior cavity 212 has an increased volume portion P, at least in the direction away from the occlusal plane S. Figure 14 In the middle, the volume of the top and right side of the rear cavity 212 is increased.

[0112] Example 3

[0113] This embodiment of the invention also provides a shell-shaped orthodontic appliance 20, which is applied in the shell-shaped orthodontic appliance set of Embodiment 1 or Embodiment 2, and serves as an enlarged orthodontic appliance therein. The shell-shaped orthodontic appliance 20 has a cavity 21 corresponding to the attachment 30 on the tooth 10. At least one cavity 21 of the shell-shaped orthodontic appliance 20 is configured such that at least a portion of the size of the anchorage region of the cavity 21 is enlarged in the direction of action. This enables adjustment and control of the anchorage of a portion of the tooth 10 to achieve anchorage reduction or anchorage transfer, and avoids cumbersome clinical operations such as grinding and re-bonding of the attachment 30.

[0114] Example 4

[0115] This utility model embodiment provides a design method for a shell-shaped orthodontic appliance 20, such as... Figure 15 As shown, the design method of the shell-shaped orthodontic appliance 20 includes:

[0116] S10: Confirm the movement method of tooth 10 and design the arrangement of attachments 30 on tooth 10. Specifically, take an impression and generate a digital model of tooth 10 in the computer. Based on the orthodontic needs, confirm the movement method of the digital tooth 10 and add attachments to tooth 10 as needed.

[0117] S20: Identify undesigned anchorage conditions in the anchorage region of cavity 21. As provided in Examples 1 and 2, identify potential side effects that may occur in anchorage teeth at a certain stage.

[0118] S30: When the non-designed load is large, at least part of the size of the load region of cavity 21 is enlarged.

[0119] Specifically, step S30 may include the following steps:

[0120] S31: Determine the tooth position that needs to be enlarged;

[0121] S32: Determine the cavity 21 that needs to be enlarged;

[0122] S33: Determine the amplification method of cavity 21;

[0123] S34: Determine the number of steps required to amplify cavity 21.

[0124] This enlarges the cavity 21 to form a digital model of the enlarged shell-shaped orthodontic appliance 20.

[0125] Furthermore, such as Figure 13 As shown, the design method of the shell-shaped orthodontic appliance 20 also includes:

[0126] S40: When the non-designed support is restored to a smaller size, restore the original size of the support area of ​​cavity 21.

[0127] Furthermore, such asFigure 13 As shown, in the design of steps S10, S30, and S40 above, a corresponding digital tooth model 10 can be output, and a corresponding shell-shaped orthodontic appliance 20 can be made from it for wearing on the tooth 10 for orthodontic treatment. The shell-shaped orthodontic appliances 20 generated in these multiple steps form a shell-shaped orthodontic appliance set.

[0128] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A shell-shaped aligner kit, characterized in that, The shell-shaped aligner set comprises a plurality of shell-shaped aligners worn on teeth step by step, In the plurality of shell-shaped aligners, after the shell-shaped aligner of a current step is worn on teeth, the shell-shaped aligner of a next step is worn on the teeth after the shell-shaped aligner of the current step is worn on the teeth; the shell-shaped aligner of the current step and the shell-shaped aligner of the next step both have cavities corresponding to the same tooth and accessories; At least one set of adjacent shell-shaped aligners has the following relationship:

2. The shell aligner kit of claim 1, wherein, The cavity volume of the shell-shaped aligner of the next step is greater than the cavity volume of the shell-shaped aligner of the current step.

3. The shell aligner kit of claim 1, wherein, The design misalignment amount between the cavity of the shell-shaped aligner of the next step and the accessory is greater than the design misalignment amount between the cavity of the shell-shaped aligner of the current step and the accessory.

4. The shell aligner kit of claim 1, wherein, The cavity of the shell-shaped aligner of the next step can completely contain the cavity of the shell-shaped aligner of the current step. The shell-shaped aligner set is used for distal movement of molars, 5. The shell aligner kit of claim 1, wherein, The part of the cavity volume of the shell-shaped aligner of the next step, which is greater than the cavity volume of the shell-shaped aligner of the current step, is located at least in the distal direction of the shell-shaped aligner. The shell-shaped aligner set is used for deep overbite extraction and retraction of anterior teeth, 6. The shell aligner kit of any one of claims 1-5, wherein, The part of the cavity volume of the shell-shaped aligner of the next step, which is greater than the cavity volume of the shell-shaped aligner of the current step, is located at least in the direction away from the jaw plane of the shell-shaped aligner.

7. A shell aligner kit, characterized in that, The tooth corresponding to the cavity is a target tooth in the current step and is an anchor tooth in the next step. The shell-shaped aligner set comprises a plurality of shell-shaped aligners worn on teeth step by step, In the plurality of shell-shaped aligners, after the shell-shaped aligner of a current step is worn on teeth, the shell-shaped aligner of a next step is worn on the teeth after the shell-shaped aligner of the current step is worn on the teeth; the shell-shaped aligner of the current step and the shell-shaped aligner of the next step both have cavities corresponding to the same tooth and accessories; 8. The shell aligner kit of claim 7, wherein, At least one cavity of the shell-shaped aligner of the next step is configured such that at least part of the anchor area of the cavity is enlarged in the action direction.

9. The shell aligner kit of claim 7, wherein, The shell-shaped aligner of the current step has a cavity in contact with the accessory on the tooth and applying force, and the cavity of the shell-shaped aligner of the current step corresponding to the enlarged cavity of the shell-shaped aligner of the next step.

10. The shell aligner kit of claim 9, wherein, At least one action surface of the anchor area of the cavity is offset and enlarged relative to the accessory on the tooth.

11. The shell aligner kit of claim 7, wherein, The anchor area of the cavity has a plurality of offset and enlarged action surfaces, and a plurality of the action surfaces have the same offset and enlarged amount or different offset and enlarged amounts.

12. The shell aligner kit of claim 11, wherein, The size of the cavity is enlarged as a whole.

13. The shell aligner kit of claim 7, wherein, The cavity is enlarged as a whole in three spatial directions, and the enlargement amount of the cavity in three spatial directions is equal or unequal.

14. The shell aligner kit of claim 7, wherein, The enlarged part of the anchor area of the cavity is not less than 0.1 mm in the enlarged offset amount.

15. The shell aligner kit of claim 7, wherein, The cavity of the shell-shaped aligner applies an anchor force to the accessory of the target anchor tooth, and the enlarged amount of the cavity is negatively related to the anchor force provided by other anchor teeth except the target anchor tooth. The shell-shaped aligner of the next step has a plurality of enlarged cavities, and the enlarged offset amount of the cavity close to the target force application tooth is greater than the enlarged offset amount of the cavity away from the target force application tooth.

16. The shell aligner kit of any one of claims 7-15, wherein, The tooth corresponding to the cavity is a target tooth in the previous step of treatment and is an anchorage tooth in the next step of treatment.

17. The shell aligner kit of claim 16, wherein, The shell-shaped appliance set is used for distal movement of molars, the shell-shaped appliance of the previous step is used for distal movement of distal teeth, the shell-shaped appliance of the next step is used for distal movement of middle teeth, and the cavity of the shell-shaped appliance of the next step is enlarged and includes a cavity corresponding to a distal tooth accessory.

18. The shell aligner kit of claim 17, wherein, The enlarged surface of the cavity includes an action surface close to the distal direction.

19. The shell aligner kit of claim 18, wherein, The cavity is enlarged by a factor of 1.1-1.2 at the action surface, or the entire cavity is enlarged by a factor of 1.1-1.

2.

20. The shell aligner kit of claim 16, wherein, The shell-shaped appliance set is used for deep overbite extraction and incisor retraction, the shell-shaped appliance of the previous step is used for lowering cuspid teeth, the shell-shaped appliance of the next step is used for lowering incisor teeth, and the cavity of the shell-shaped appliance of the next step is enlarged and includes a cavity corresponding to a cuspid tooth accessory.

21. The shell aligner kit of claim 20, wherein, The enlarged surface of the cavity includes an action surface close to the jaw plane.

22. A shell aligner characterized by, The shell-shaped appliance has a cavity corresponding to an accessory on a tooth, and at least one cavity of the shell-shaped appliance is configured such that at least part of the anchorage area of the cavity is enlarged in the action direction.

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