Shell aligner kit, shell aligner and method of designing a shell aligner

Abstract

This invention discloses a shell-shaped orthodontic appliance set, a shell-shaped orthodontic appliance, and a design method for the shell-shaped orthodontic appliance. After the previous shell-shaped orthodontic appliance has been used to treat the teeth, a subsequent shell-shaped orthodontic appliance is worn on the teeth treated in the previous step. Both the previous and subsequent shell-shaped orthodontic appliances have cavities corresponding to attachments on the teeth. At least one cavity of the subsequent shell-shaped orthodontic appliance is configured such that at least a portion of the size of the anchorage region of the cavity is enlarged in the direction of action. Using this method, when it is identified that undesigned anchorage will occur on the subsequent shell-shaped orthodontic appliance, by enlarging at least a portion of the size of the cavity where undesigned anchorage will occur, the contact between the shell-shaped orthodontic appliance and the dental attachments at that cavity is reduced or avoided. This achieves anchorage adjustment and control of some teeth, thereby reducing or transferring anchorage, and avoiding cumbersome clinical operations such as grinding and re-bonding attachments.

Description

Technical Field

[0001] This invention relates to the field of orthodontics, and more particularly to a shell-shaped orthodontic appliance set, a shell-shaped orthodontic appliance, and a design method for the shell-shaped orthodontic appliance. Background Technology

[0002] In the clinical orthodontic industry, bracketless shell dental appliances are increasingly used for orthodontic treatment. Generally, multiple shell appliances are used in a step-by-step manner for orthodontic treatment. The shell appliance accommodates the teeth to move the target teeth from a first position to a second position, and is usually accompanied by various types of attachments bonded to the teeth to assist the shell appliance in applying force to the teeth.

[0003] Because the shell-shaped orthodontic appliance is a single unit, while applying force to the target tooth, the reaction force is transmitted through the shell-shaped appliance to the adjacent teeth, forming anchorage force. This anchorage force is usually undesigned, and therefore can cause certain side effects, such as undesigned tooth movements in the anchorage teeth, or reciprocating movements in the anchorage teeth.

[0004] To reduce the impact of anchorage, a common clinical practice is to grind down the attachments on the patient's teeth during partial orthodontic treatment, rendering them ineffective and reducing the impact of anchorage. The attachments are then re-bonded to assist in applying force. This method involves a rather cumbersome clinical procedure and provides a poor experience for both doctors and patients. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of non-designed support force in shell-shaped orthodontic appliances in the prior art, and to provide a shell-shaped orthodontic appliance set, a shell-shaped orthodontic appliance, and a design method for the shell-shaped orthodontic appliance.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A shell-shaped orthodontic appliance set includes multiple shell-shaped appliances that are progressively worn onto the teeth. In the multiple shell-shaped appliances, after the previous shell-shaped appliance has completed the orthodontic treatment, a subsequent shell-shaped appliance is worn on the teeth that have been treated in the previous step. Both the previous and subsequent shell-shaped appliances have cavities corresponding to attachments on the same tooth. At least one pair of adjacent shell-shaped appliances has the following relationship: the cavity volume of the subsequent shell-shaped appliance is larger than the cavity volume of the previous shell-shaped appliance.

[0008] In this approach, the cavity volume of the subsequent shell-shaped orthodontic appliance can be configured to be larger than that of the previous shell-shaped orthodontic appliance. Thus, when it is identified that undesigned anchorage will occur on the subsequent shell-shaped orthodontic appliance, the enlarged cavity volume can reduce or avoid the contact between the shell-shaped orthodontic appliance and the dental attachments at that cavity, thereby achieving anchorage adjustment and control of some teeth, so as to achieve anchorage reduction or anchorage transfer, and avoid cumbersome clinical operations such as grinding and re-bonding of attachments.

[0009] Preferably, the design misalignment of the cavity and accessories of the shell-shaped orthodontic appliance in the subsequent step is greater than the design misalignment of the cavity and accessories of the shell-shaped orthodontic appliance in the preceding step.

[0010] Preferably, the cavity of the subsequent shell-shaped orthodontic appliance can completely accommodate the cavity of the preceding shell-shaped orthodontic appliance.

[0011] Preferably, the shell-shaped orthodontic appliance is used for distalization of molars, and the portion of the cavity volume of the subsequent shell-shaped orthodontic appliance that is larger than the cavity volume of the previous shell-shaped orthodontic appliance is located at least in the distal direction of the shell-shaped orthodontic appliance.

[0012] In this approach, during the distalization of molars, after the previous shell appliance is completed, the target tooth moves distally, and the attachments on the tooth move distally along with the tooth. By increasing the volume of the shell appliance in the distal direction relative to the volume of the shell appliance in the previous step, the resistance force exerted by the shell appliance in the previous step on the target tooth can be reduced and transferred, thus avoiding affecting the treatment effect of the target tooth in the previous step.

[0013] Preferably, the shell-shaped appliance assembly is used for deep overbite extraction to retract and intrude the anterior teeth, and the cavity volume of the subsequent shell-shaped appliance, the portion larger than the cavity volume of the previous shell-shaped appliance, is located at least in the occlusal plane direction away from the shell-shaped appliance.

[0014] In this approach, during the treatment of deep overbite extraction and intrusion of anterior teeth, after the previous shell appliance is completed, the target tooth is retracted away from the occlusal plane, and the attachments on the tooth move away from the occlusal plane along with the tooth. By increasing the cavity volume of the subsequent shell appliance relative to the cavity volume of the previous shell appliance at its position away from the occlusal plane, the resistance force exerted by the subsequent shell appliance 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.

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

[0016] A shell-shaped orthodontic appliance kit, the shell-shaped orthodontic appliance kit comprising multiple shell-shaped appliances that are progressively worn onto the teeth.

[0017] In the plurality of shell-shaped orthodontic appliances, after the previous shell-shaped orthodontic appliance has completed the orthodontic treatment of the teeth, the next shell-shaped orthodontic appliance is worn on the teeth that have been treated in the previous step; both the previous and the next shell-shaped orthodontic appliances have cavities corresponding to the attachments on the teeth.

[0018] In this embodiment, at least one cavity of the shell-shaped orthodontic appliance in the next step is configured such that at least a portion of the size of the anchorage region of the cavity is enlarged in the direction of action.

[0019] In this approach, when it is identified that undesigned anchorage will occur on the shell appliance in the next step, at least part of the size of the cavity where the undesigned anchorage will occur is enlarged to reduce or avoid contact between the shell appliance and the dental attachments at that cavity. This allows for the adjustment and control of the anchorage of some teeth, thereby achieving anchorage reduction or anchorage transfer, and avoiding cumbersome clinical operations such as grinding and re-bonding of attachments.

[0020] Preferably, the preceding shell-shaped appliance has a cavity that contacts and applies force to attachments on the teeth, and the cavity in the preceding shell-shaped appliance that applies force corresponds to the enlarged cavity in the subsequent shell-shaped appliance.

[0021] In this approach, the enlarged cavity of the shell-shaped appliance in the later step is designed to target the cavity where the force was applied in the previous step, thus avoiding any impact on the orthodontic effect of the previous step.

[0022] Preferably, at least one working surface of the anchorage region of the cavity is offset and enlarged relative to the attachments on the tooth.

[0023] In this approach, at least one surface of the cavity's anchorage region can be enlarged according to the needs of orthodontic treatment, such as the overall requirements for anchorage. This can both reduce the weakening of the cavity's anchorage due to undesigned anchorage and provide sufficient anchorage to meet the current orthodontic needs.

[0024] Preferably, the support region of the cavity has multiple offset amplification surfaces, and the multiple surfaces have the same offset amplification amount or different offset amplification amounts.

[0025] In this scheme, different offset distances can be set to adjust the force on the target anchorage tooth.

[0026] Preferably, the size of the cavity is enlarged overall.

[0027] In this solution, the overall size of the cavity can be increased to reduce or avoid the support force.

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

[0029] In this scheme, by setting unequal amplification in three directions, different adjustments to the force on the target anchorage tooth can be achieved.

[0030] Preferably, the magnification offset of the magnified portion in the support region of the cavity is not less than 0.1 mm.

[0031] Preferably, the amount by which the cavity is amplified is negatively correlated with the anchorage provided by other anchorage teeth.

[0032] In this design, if the anchorage provided by other anchorage teeth is sufficient, the cavity can be enlarged to ensure that the cavity does not come into contact with the tooth attachments. If the anchorage provided by other anchorage teeth is insufficient, the cavity can be enlarged to allow it to provide some auxiliary anchorage.

[0033] Preferably, the shell-shaped orthodontic appliance in the subsequent step has multiple magnified cavities, wherein the magnification offset of the cavity closer to the target tooth is greater than the magnification offset of the cavity farther away from the target tooth.

[0034] In this scheme, the above configuration enables reasonable adjustment of the support force.

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

[0036] Preferably, the shell-shaped appliance is used for distalization of molars, the preceding shell-shaped appliance is used for distalization of terminal teeth, the subsequent shell-shaped appliance is used for distalization of mid-segment teeth, and the enlarged cavity of the subsequent shell-shaped appliance includes a cavity corresponding to the terminal tooth attachment.

[0037] Preferably, the enlarged surface of the cavity includes the action surface near the distal direction.

[0038] Preferably, the magnification of the cavity at the working surface is 1.1 to 1.2, or the overall magnification of the cavity is 1.1 to 1.2.

[0039] Preferably, the shell-shaped appliance is used for deep overbite extraction to retract and intrude the anterior teeth, the preceding shell-shaped appliance is used to intrude the canines, the subsequent shell-shaped appliance is used to intrude the incisors, and the enlarged cavity of the subsequent shell-shaped appliance includes a cavity corresponding to the canine tooth attachment.

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

[0041] A shell-shaped orthodontic appliance having cavities corresponding to attachments on the teeth, wherein at least one cavity of the shell-shaped orthodontic appliance is configured such that at least a portion of the size of the anchorage region of the cavity is enlarged in the direction of action.

[0042] This approach enables the adjustment and control of anchorage in some teeth, thereby reducing or transferring anchorage, and avoids cumbersome clinical procedures such as grinding and re-bonding of attachments.

[0043] A method for designing a shell-shaped orthodontic appliance, the method comprising:

[0044] S10: Confirm the tooth movement method and design the placement of dental attachments;

[0045] S20: Identify the non-designed reinforcement status of the cavity's reinforcement area;

[0046] S30: When the non-designed load is large, at least part of the size of the load-bearing region of the cavity is enlarged.

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

[0048] S40: When the non-designed bracing recovers to a smaller value, restore the original size of the bracing region of the cavity.

[0049] Preferably, in S30, enlarging at least a portion of the dimensions of the support region of the cavity includes:

[0050] S31: Determine the tooth position that needs to be enlarged;

[0051] S32: Determine the cavity that needs to be enlarged;

[0052] S33: Determine the method of cavity amplification;

[0053] S34: Determine the number of steps required for cavity amplification.

[0054] The positive and progressive effects of this invention are as follows: when it is identified that undesigned anchorage will appear on the shell-shaped orthodontic appliance in the next step, by enlarging at least part of the size of the cavity where the undesigned anchorage will appear, the contact between the shell-shaped orthodontic appliance and the dental attachments at that cavity is reduced or avoided, thereby achieving anchorage adjustment and control of some teeth, so as to achieve anchorage reduction or anchorage transfer, and avoid cumbersome clinical operations such as grinding and re-bonding of attachments. Attached Figure Description

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

[0057] Figure 3 This is 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 This is 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 illustrating the enlarged cavity volume provided in an embodiment of the present invention;

[0068] Figure 14 Another schematic diagram showing the enlarged cavity volume provided in an embodiment of the present invention;

[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] Explanation of reference numerals in the attached figures

[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 illustrated by way of embodiments below, 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 Figure 4-5 , Figure 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, as... Figure 4-5 , Figure 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 kit 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 invention 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. Figure 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 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 procedures such as grinding and re-bonding of the attachment 30.

[0114] Example 4

[0115] This invention 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 as Figure 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 the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A shell-shaped orthodontic appliance set, characterized in that, The shell-shaped orthodontic appliance set includes multiple shell-shaped appliances that are progressively worn onto the teeth. In the plurality of shell-shaped orthodontic appliances, after the previous shell-shaped orthodontic appliance has completed the orthodontic treatment of the teeth, the next shell-shaped orthodontic appliance is worn on the teeth that have been treated in the previous step; both the previous and the next shell-shaped orthodontic appliances have cavities corresponding to attachments on the same teeth; wherein, at least one set of adjacent shell-shaped orthodontic appliances has the following relationship: The cavity volume of the shell appliance in the later step is larger than that of the shell appliance in the previous step.

2. The shell-shaped orthodontic appliance set as described in claim 1, characterized in that, The design misalignment of the cavity and accessories of the shell-shaped orthodontic appliance in the subsequent step is greater than the design misalignment of the cavity and accessories of the shell-shaped orthodontic appliance in the previous step.

3. The shell-shaped orthodontic appliance set as described in claim 1, characterized in that, The cavity of the subsequent shell-shaped orthodontic appliance can completely accommodate the cavity of the previous shell-shaped orthodontic appliance.

4. The shell-shaped orthodontic appliance set as described in claim 1, characterized in that, The shell-shaped orthodontic appliance set is used to move molars distally. The portion of the cavity volume of the subsequent shell-shaped orthodontic appliance that is larger than the cavity volume of the previous shell-shaped orthodontic appliance is located at least in the distal direction of the shell-shaped orthodontic appliance.

5. The shell-shaped orthodontic appliance set as described in claim 1, characterized in that, The shell-shaped orthodontic appliance set is used for deep overbite extraction to retract and intrude the anterior teeth. The portion of the cavity volume of the shell-shaped orthodontic appliance in the subsequent step that is larger than the cavity volume of the shell-shaped orthodontic appliance in the previous step is located at least in the direction away from the jaw plane of the shell-shaped orthodontic appliance.

6. The shell-shaped orthodontic appliance set as described in any one of claims 1-5, characterized in that, The tooth corresponding to the cavity is the target tooth in the previous orthodontic step and the anchorage tooth in the next orthodontic step.

7. A shell-shaped orthodontic appliance set, characterized in that, The shell-shaped orthodontic appliance set includes multiple shell-shaped appliances that are progressively worn onto the teeth. In the plurality of shell-shaped orthodontic appliances, after the previous shell-shaped orthodontic appliance has completed the orthodontic treatment of the teeth, the next shell-shaped orthodontic appliance is worn on the teeth that have been treated in the previous step; both the previous and the next shell-shaped orthodontic appliances have cavities corresponding to the attachments on the teeth. In this embodiment, at least one cavity of the shell-shaped orthodontic appliance in the next step is configured such that at least a portion of the size of the anchorage region of the cavity is enlarged in the direction of action.

8. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, The preceding shell-shaped appliance has a cavity that contacts and applies force to attachments on the teeth, and the cavity in the preceding shell-shaped appliance that applies force corresponds to the enlarged cavity in the subsequent shell-shaped appliance.

9. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, At least one working surface of the anchorage region of the cavity is offset and enlarged relative to the attachments on the tooth.

10. The shell-shaped orthodontic appliance set as described in claim 9, characterized in that, The support region of the cavity has multiple offset amplification surfaces, and the multiple surfaces have the same offset amplification amount or different offset amplification amounts.

11. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, The dimensions of the cavity were enlarged overall.

12. The shell-shaped orthodontic appliance set as described in claim 11, characterized in that, The cavity is enlarged as a whole in three spatial directions, and the enlargement of the cavity in the three spatial directions may be equal or unequal.

13. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, The magnification offset of the magnified portion in the support region of the cavity is not less than 0.1 mm.

14. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, The amount by which the cavity is amplified is negatively correlated with the anchorage force provided by other anchorage teeth.

15. The shell-shaped orthodontic appliance set as described in claim 7, characterized in that, The subsequent shell-shaped orthodontic appliance has multiple magnified cavities, with the magnification offset of the cavity closer to the target tooth being greater than that of the cavity farther away from the target tooth being subjected to force.

16. The shell-shaped orthodontic appliance set as described in any one of claims 7-15, characterized in that, The tooth corresponding to the cavity is the target tooth in the previous orthodontic step and the anchorage tooth in the next orthodontic step.

17. The shell-shaped orthodontic appliance set as described in claim 16, characterized in that, The shell-shaped appliance set is used for distalization of molars. The previous shell-shaped appliance is used for distalization of terminal teeth, and the subsequent shell-shaped appliance is used for distalization of mid-segment teeth. The enlarged cavity of the subsequent shell-shaped appliance includes a cavity corresponding to the attachments of the terminal teeth.

18. The shell-shaped orthodontic appliance set as described in claim 17, characterized in that, The magnified surface of the cavity includes the action surface near the distal direction.

19. The shell-shaped orthodontic appliance set as described in claim 17, characterized in that, The magnification factor of the cavity at the working surface is 1.1 to 1.2, or the overall magnification factor of the cavity is 1.1 to 1.

2.

20. The shell-shaped orthodontic appliance set as described in claim 16, characterized in that, The shell-shaped appliance set is used for deep overbite extraction, retraction, and intrusion of the anterior teeth. The shell-shaped appliance in the previous step is used to intrude the canines, and the shell-shaped appliance in the subsequent step is used to intrude the incisors. The enlarged cavity of the shell-shaped appliance in the subsequent step includes a cavity corresponding to the canine tooth attachment.

21. The shell-shaped orthodontic appliance set as described in claim 20, characterized in that, The magnified surface of the cavity includes the functional surface near the jaw plane.

22. A shell-shaped orthodontic appliance, characterized in that, The shell-shaped appliance has cavities corresponding to attachments on the teeth, and at least one cavity of the shell-shaped appliance is configured such that at least a portion of the size of the anchorage region of the cavity is enlarged in the direction of action.

23. A design method for a shell-shaped orthodontic appliance, characterized in that, The design method of the shell-shaped orthodontic appliance includes: S10: Confirm the tooth movement method and design the placement of dental attachments; S20: Identify the non-designed reinforcement status of the cavity's reinforcement area; S30: When the non-designed load is large, at least part of the size of the load-bearing region of the cavity is enlarged.

24. The design method of the shell-shaped orthodontic appliance as described in claim 23, characterized in that, The design method for the shell-shaped orthodontic appliance also includes: S40: When the non-designed bracing recovers to a smaller value, restore the original size of the bracing region of the cavity.

25. The design method of the shell-shaped orthodontic appliance as described in claim 23, characterized in that, In S30, enlarging at least a portion of the dimensions of the support region of the cavity includes: S31: Determine the tooth position that needs to be enlarged; S32: Determine the cavity that needs to be enlarged; S33: Determine the method of cavity amplification; S34: Determine the number of steps required for cavity amplification.

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