CN114246698B - Design method and manufacturing method of shell-shaped tooth appliance - Google Patents
Design method and manufacturing method of shell-shaped tooth appliance Download PDFInfo
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- CN114246698B CN114246698B CN202011016472.8A CN202011016472A CN114246698B CN 114246698 B CN114246698 B CN 114246698B CN 202011016472 A CN202011016472 A CN 202011016472A CN 114246698 B CN114246698 B CN 114246698B
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- 238000013461 design Methods 0.000 title claims abstract description 33
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
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Abstract
The invention discloses a design method and a manufacturing method of a shell-shaped dental appliance, which solve the problem of insufficient retention of the existing shell-shaped dental appliance, especially for the problem of insufficient retention of teeth with short crowns, promote the corrective curative effect of the shell-shaped dental appliance, increase the retention of the short teeth without affecting the beauty and achieve the purpose of increasing the invisible corrective curative effect and the satisfaction of patients. The design method of the shell-shaped dental appliance comprises the steps of obtaining a digital dental model, cutting the digital dental model, virtually designing an appliance plan and designing the digital model of the shell-shaped dental appliance, wherein through the design, an auxiliary retention part is further arranged between cavities for accommodating two adjacent teeth on the shell-shaped body of the shell-shaped dental appliance, and the auxiliary retention part has a geometric structure for providing retention force for enabling the shell-shaped body to wrap the teeth firmly. The manufacturing method is to manufacture the shell-shaped dental appliance based on the design method.
Description
Technical Field
The invention belongs to the technical field of tooth correction, and particularly relates to a manufacturing technology of a shell-shaped tooth correction device, in particular to a design method and a manufacturing method of a shell-shaped tooth correction device with a reinforcing retention effect.
Background
In recent years, with the wide popularization of orthodontic treatment, more and more people choose invisible correction, and both beautiful appearance and comfort are achieved in the process of receiving orthodontic treatment.
However, in the invisible correction, the retention of teeth aiming at the shortness of the dental crown is a great technical difficulty to be solved. Insufficient retention of the small crown may result in the inability of the invisible dental appliance to remain with the teeth for a long period of time, resulting in the inability of the appliance to provide a sustained appliance force for a long period of time, affecting the appliance efficacy and progress. In addition, the attachment on the small and short dental crowns is difficult to adhere, and the problem of insufficient expression of the attachment effect is easily generated, so that the small and short dental crowns are usually present in a large number of teenagers, the dental crowns are small, the compliance is poor, and the attachment is difficult to adhere in the mouth while keeping an open state for a long time.
In the traditional dental appliance, the functional appliance is usually an interproximal hook made of stainless steel wires, mainly penetrates into the interproximal space of teeth through a right-angle-shaped hook, and plays a role in retention by means of undercut, but the functional appliance is not only attractive, but also easily causes damage to the intraoral mucosa. Particularly the interproximal hooks of the anterior and premolars, are prone to exposure during patient communication, which may lead to social barriers or socioeconomic problems for the patient. In addition, the conventional interproximal hook is divided into two parts: a retention groove and a connector; the retention groove enters the tooth adjacent surface undercut area, and the connector prevents the steel wire from rotating in the base. The traditional structure of the interproximal hooks is a common structure for fixed correction, and the combination effect cannot be achieved when invisible correction is used.
Therefore, research on the invisible appliance which can be worn with beautiful and comfortable appearance and can achieve the correction effect has important significance.
Disclosure of Invention
The invention mainly aims to provide a design method and a manufacturing method of a shell-shaped dental appliance, which solve the problem of insufficient retention of the existing shell-shaped dental appliance, especially for the short and small teeth of a dental crown, improve the orthodontic treatment effect of the shell-shaped dental appliance, and increase the retention of the short and small teeth without affecting the beauty so as to achieve the purpose of increasing the invisible orthodontic treatment effect and the satisfaction of patients.
The technical scheme provided by the invention is as follows:
a method of designing a shell-shaped dental appliance, the method comprising the steps of:
acquisition of a digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital dental model and a digital gingival model;
cutting of digital dental model: dividing the digital dental model into an independent digital gingival model and a single digital dental crown model;
virtual design of the correction plan: virtually designing the single digital dental crown model to gradually change the single digital dental crown model from an initial position to a target correction position to obtain a series of intermediate digital dental jaw models;
design of shell-shaped tooth appliance digital model: designing a shell dental appliance digital model such that the shell dental appliance comprises a shell body having a cavity accommodating a plurality of teeth and such that the shell body is further provided with an auxiliary retention portion between the cavities accommodating two adjacent teeth, the auxiliary retention portion being designed with a geometry providing retention force that causes the shell body to firmly wrap around the plurality of teeth.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion together with the tooth-receiving cavity is firmly wrapped by 70% -100% of the area of a single tooth.
As a preferred embodiment of the method of designing a shell-like dental appliance, the auxiliary retention portion is designed as a geometrical structure concavely formed toward the tooth space and/or gum direction.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion is provided at a portion of the shell-shaped body adjacent to one side of the gum and/or adjacent to a tooth gap between two adjacent teeth.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion is configured as a filling portion which is concavely formed toward the tooth gap and can fill the tooth gap when the shell-shaped body is disposed adjacent to the tooth gap between two adjacent teeth.
As a preferred embodiment of the method of designing a shell-shaped dental appliance, the filling part is designed as a plate-shaped structure connecting cheek/tongue sides or lip/tongue sides between tooth gaps, or as a concave structure provided along cheek/tongue sides or lip/tongue sides between tooth gaps, the concave structure at least partially covering the proximal/distal surfaces of two adjacent teeth.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion is designed as a concave triangle structure which wraps around the gingival papilla and has a shape matching the shape of the gingival papilla.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the distance between the auxiliary retention portion and the gingival papilla is designed to be 0.1-0.6mm.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion is provided on the lingual side, or the labial/buccal side, or both the lingual side and the labial/buccal side of the shell-shaped body.
As a preferred embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portion is provided in an anterior dental region, or a posterior dental region, or both of the anterior dental region and the posterior dental region of the shell-shaped body.
As a preferred embodiment of the method of designing a shell-like dental appliance, the auxiliary retention portion has a modulus of elasticity greater than that of a portion of the shell-like body other than the auxiliary retention portion.
As a preferred embodiment of the design method of the shell dental appliance, the shell dental appliance is used for increasing the retention of the short crown; the shell-like body is designed to have a geometry that gradually repositions the teeth from an initial position to a target appliance position.
Based on the same inventive concept, the invention also provides a manufacturing method of the shell-shaped dental appliance, wherein the shell-shaped dental appliance digital model obtained by the design method of the shell-shaped dental appliance according to any one of the above steps is manufactured by adopting hot-press film forming or adopting additive manufacturing technology, so that the shell-shaped dental appliance is obtained.
The design method and the manufacturing method of the shell-shaped dental appliance provided by the invention can bring at least one of the following beneficial effects:
the shell-shaped dental appliance obtained by the design method and the manufacturing method provided by the invention is characterized in that an auxiliary retention part is further arranged between the cavities of the shell-shaped body for accommodating two adjacent teeth, the auxiliary retention part has a geometric structure for providing retention force for enabling the shell-shaped body to firmly wrap the teeth, the teeth are better in retention force, the attachment of accessories can be reduced for smaller patients with crowns, the comfort of the patients is improved, and especially for teenager patients, the time for the patients to visit beside chairs is reduced, and the compliance of the patients is indirectly improved.
The shell-shaped dental appliance obtained by the design method and the manufacturing method can also directly or indirectly increase the gap distance between teeth, and can maintain the gap distance for patients needing to maintain the tooth gap, thereby providing correction conditions for subsequent correction.
Drawings
The above features, technical features, advantages and implementation thereof will be further described in the following detailed description of preferred embodiments with reference to the accompanying drawings in a clearly understandable manner.
FIG. 1 is a schematic flow diagram of a method for designing a shell-shaped dental appliance in accordance with the present invention;
FIG. 2 is a schematic view of a shell-shaped dental appliance according to the present invention;
FIGS. 3a, 3b are cross-sectional views of FIG. 2 taken along line A-A' and highlighting the secondary retention feature;
FIG. 4 is a partial view of another auxiliary retention feature in a shell-like dental appliance provided by the design method of the present invention;
FIG. 5 is a schematic view of another shell-shaped dental appliance provided by the design method of the present invention;
FIGS. 6a and 6B are sectional views taken along line B-B' of FIG. 5, wherein two views are partial sectional views of two types of filling portions having plate-like structures;
fig. 7 is a schematic cross-sectional view of another shell-shaped dental appliance according to the present invention, wherein the filling portion is a partially cross-sectional view of the concave structure.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Example 1
The present embodiment provides a design method of a shell-shaped dental appliance for enhanced retention of the appliance on teeth, referring to fig. 1, the design method includes the steps of:
s1, acquiring a digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital dental model and a digital gingival model;
s2, cutting the digital dental model: dividing the digital dental model into an independent digital gingival model and a single digital dental crown model;
s3, virtual design of an correction plan: virtually designing the single digital dental crown model to gradually change the single digital dental crown model from an initial position to a target correction position to obtain a series of intermediate digital dental jaw models; the initial position can be the original tooth layout before the orthodontic correction is started or any stage in the correction process, and the target correction position can be any stage after the orthodontic correction and can be the later stage or later stages of the original tooth layout;
s4, designing a shell-shaped tooth appliance digital model: designing a shell dental appliance digital model such that the shell dental appliance comprises a shell body having a cavity accommodating a plurality of teeth and such that the shell body is further provided with an auxiliary retention portion between the cavities accommodating two adjacent teeth, the auxiliary retention portion being designed with a geometry providing retention force that causes the shell body to firmly wrap around the plurality of teeth.
In the design method described in the present embodiment,
the digitized dental model may be obtained in step S1 by any one of the following methods: obtaining a digital model representing the original tooth layout by means of a tomography (CAT scan), a digital tomography (CT), a Cone Beam CT (CBCT), a Magnetic Resonance Imaging (MRI), an intraoral optical scan and the like; alternatively, a plaster cast of the patient's teeth may be first prepared by conventional means, and then scanned by a scanning device such as a laser scanning device, a CT scanning device to obtain a digital model representing the original tooth layout;
the cutting of the digitized dental model in step S2 may take the following non-limiting examples:
the dividing method is carried out by, for example, the following steps:
s200: and selecting first type characteristic points on a digital dental model to be segmented, wherein the digital dental model is a triangular facial mask model.
S201: classifying the second type of feature points in the digital dental model according to the first type of feature points, and determining the teeth to which each second type of feature points belong.
S202: combining the second type of characteristic points belonging to each tooth respectively to obtain a digital tooth area of each single tooth after the digital dental model is divided;
the first type of characteristic points are triangular patch vertexes which are selected based on the digital dental model and used for guiding the segmentation of each single tooth in the dental, and the second type of characteristic points are triangular patch vertexes which are selected based on the digital dental model and used for representing the overall shape of the digital dental model; that is, the first type of feature points are feature points for guiding division of the dental jaw, and the second type of feature points are feature points when the dental jaw is specifically divided; the second type of feature points can be accurately classified into each tooth through the segmentation guide of the first type of feature points, so that the segmentation precision of the dental jaw is improved;
the first type of characteristic points are selected on the whole digital dental model, and then the second type of characteristic points on the digital dental model are classified and then assembled according to the first type of characteristic points, so that the segmentation of single teeth is realized.
In step S3, virtually designing the single digital dental crown model, so that the single digital dental crown model gradually changes from an initial position to a target correction position, and a series of intermediate digital dental models are obtained; the initial position can be the original tooth layout before the orthodontic correction starts or any stage in the correction process, and the target correction position can be any stage after the orthodontic correction and can be the later stage or later stages of the original tooth layout; the target correction position can be a position for carrying out final correction effect according to patient appeal and intraoral conditions by doctors and medical designers, can be recommended according to intraoral digital design software and similar cases, and can be adjusted more pertinently for patient treatment according to the recommended results.
In step S4, the shell-like body has a plurality of portions between the cavities accommodating two adjacent teeth, and auxiliary retainers may be provided on one or more of the portions. The stability wrap includes all cases where the auxiliary retention feature is capable of producing retention force, and further may be measured in terms of the wrapped area of the tooth, e.g., calculated as a single tooth, where the wrapped area of the single tooth is 70% -100% defined as a stability wrap, whereas the area of a conventional shell-like body wrapping the single tooth is typically 60% -65%.
Referring to fig. 2, which illustrates a shell-shaped dental appliance structure provided by the design method of the present embodiment, fig. 2 provides a shell-shaped dental appliance 100, which includes a shell-shaped body 11, wherein the shell-shaped body 11 has a plurality of cavities 110 for accommodating a plurality of teeth; the shell body 11 is provided with an auxiliary retention portion (e.g. at 111 indicated in fig. 2) between the cavities accommodating two adjacent teeth, e.g. between cavities 110a and 110b accommodating two adjacent teeth, said auxiliary retention portion having a geometrical mechanism providing a further retention force which secures the shell body 11 around the teeth.
For the shell dental appliance 100, the shell body 11 is also able to provide some of the tooth retention force, but when the crown is small, the retention force generated by the shell body 11 alone wrapping the tooth surface is insufficient to ensure the retention effect between the shell body and the tooth, while the retention force provided by the auxiliary retention portion is a further enhancement and supplement to the retention force of the shell body. For the structure of the specific shell-shaped tooth appliance, the shell-shaped body and the auxiliary retention part can be designed into an integrated structure, and also can be a split structure, and the two structures are simpler to manufacture and have better retention effect.
In one embodiment, one or more auxiliary retainers may be provided on the shell-like body 11 at positions between one or more or all of the adjacent cavities 110 surrounding the teeth, respectively. Still further and specifically, the auxiliary retention portions may be disposed on the lingual side or the labial/buccal side of the shell-like body 11, or on both the lingual side and the labial/buccal side, and the specific arrangement and number may be set according to the correction requirements of the actual case, for example, for a child correction patient, may be disposed at intervals between adjacent cavities 110 of the shell-like body 11 surrounding the teeth, so that not only is the wearing comfortable, but also the retention effect is excellent.
The auxiliary retention portion may have a variety of implementations or configurations.
In one configuration, the auxiliary retention portion 211 is a geometric structure that is concave inward toward the tooth space, and more specifically, the auxiliary retention portion 211 is adjacent to the tooth space between two adjacent teeth, as shown in fig. 3 a. Or, the auxiliary retention portion 311 is a geometrical structure concaved inward toward the gum, and more specifically, the auxiliary retention portion 311 is provided at a portion of the shell-shaped body adjacent to the gum side, as shown in fig. 3 b. When the auxiliary retaining portion 211 is a geometric structure formed by recessing toward the tooth gap, one of the two ways may be a semi-cylindrical structure with recession, for example, when a gap exists between two adjacent teeth, the occlusal end and the gingival margin end of the two teeth form a gap matched with the height of the mesial-distal surface of the teeth along the extension direction of the dental crown, at this time, the auxiliary retaining portion is a semi-cylindrical structure with recession that fills or partially fills the gap, and both the labial/buccal and lingual sides may be provided, or may be provided on one side. When the auxiliary retaining portion 311 is a geometric structure formed by recessing toward the gum, one of the two ways may be a triangle structure with recession, such as a triangle structure with recession matching the shape of the nipple of the gum, or a triangle structure with recession matching a black triangle formed between two adjacent teeth adjacent to the gum. Alternatively, the auxiliary retaining portion may be formed by a combination of the two shapes. In a further preferred configuration, the auxiliary retention portion is spaced from the gingival papilla by a distance of 0.1 to 0.6mm. That is, the shape of the auxiliary retention portion is identical to the shape of the gingival papilla, but is spaced apart from the gingival papilla by a distance such that the resulting structure does not press the soft tissue of the gum, forming unnecessary intraoral lesions. In another embodiment, the auxiliary retaining portion 211 is a geometric structure formed by recessing inward toward the tooth space and simultaneously recessing inward toward the gum direction, so that the arrangement can better retain the teeth, and the retaining effect is better realized for the patient with larger space between two adjacent teeth and larger black triangle area.
More specifically, when the auxiliary retention portion is disposed on the side of the shell-shaped body adjacent to the gum, as shown in fig. 4, the auxiliary retention portion 411 includes a first connection portion 411a, a second connection portion 411b and a transition connection portion 411c, the first connection portion 411a is connected with the cavity 110 of the shell-shaped body 11 surrounding one tooth, the second connection portion 411b is connected with the cavity 110 of the shell-shaped body 11 surrounding the adjacent tooth of the one tooth, and the transition connection portion 411c connects the first connection portion 411a and the second connection portion 411b. More specifically, the transition connection 411c of the auxiliary retention portion 411 may have an arc-shaped transition structure, so that the formed structure can have a gentle transition without causing damage to the inside of the mouth of the patient due to the formation of the angular structure.
The auxiliary retention portion may further have another setting position, specifically, when the auxiliary retention portion is disposed at a tooth gap between two adjacent teeth of the shell-shaped body, the auxiliary retention portion is a filling portion that is concavely formed toward the tooth gap and is capable of filling the tooth gap. The structure formed by the arrangement form is particularly suitable for the situation of missing teeth or tooth replacement period, wherein for a patient with missing teeth, the auxiliary retention part not only has the retention effect, but also can keep the gap of the missing teeth, and two adjacent teeth are prevented from inclining towards the missing positions, so that the tooth roots are inclined. For the patients in the tooth replacement period, especially for the patients close to the tooth replacement period, as the number of the permanent teeth is increased compared with the number of the primary teeth, the primary teeth can be gradually arranged to generate gaps when the teeth are replaced, a reserved space for the permanent teeth is reserved, the reserved space which is naturally formed is required to be kept, and the gap distance is well maintained by forming a filling part between two adjacent teeth, so that the crowding of the teeth after the teeth replacement is prevented due to insufficient gaps in the tooth replacement process.
Further, the filling part 511 is a plate-shaped structure 511a, 511b connecting between the gaps of teeth in the labial/lingual direction or in the buccal/lingual direction, as shown in fig. 5, 6a and 6 b; or the filling 611 is a concave structure disposed in a cheek/lingual or labial/lingual direction between the teeth crevices, the concave structure at least partially covering the mesial/distal surfaces of adjacent two teeth as shown in fig. 7. More specifically, when the filling part is a plate-shaped structure connecting labial/lingual directions or buccal/lingual directions between gaps of teeth, the filling parts 511a, 511b may be plate-shaped structures integrally formed with the shell-shaped body 11 or separately formed, and more specifically, as shown in 511a and 511b of fig. 6a and 6b, respectively, the plate-shaped structures are filled at gaps between adjacent two teeth to maintain gap distances, and at the same time, the plate-shaped structures are in contact with proximal/distal surfaces of the adjacent two teeth, increasing contact areas of the shell-shaped dental appliance with the teeth, thereby further increasing retention effects with the teeth. When the filling portion is a concave structure disposed along the cheek/tongue side or lip/tongue side direction between the gaps of the teeth, the concave structure at least partially covers the mesial/distal surfaces of two adjacent teeth, as in the filling portion 611 in fig. 7, the filling portion is suitable for the case that the gap between two adjacent teeth is larger, and this disposition also has the effect of increasing the contact with the mesial/distal surfaces of two adjacent teeth, and at the same time, the gap distance between two adjacent teeth can be maintained according to the actual correction requirement.
For the shell-shaped dental appliance designed by the design method of the present invention, the placement position of the auxiliary retention portion may be the front tooth area or the rear tooth area of the shell-shaped body, or both the front tooth area and the rear tooth area. More specifically, the selection of the corresponding set positions may be made according to the patient's need for correction.
The design method of the present invention further preferably, the auxiliary retention portion of the shell-shaped dental appliance has a modulus of elasticity greater than that of a portion of the shell-shaped body other than the auxiliary retention portion. The elastic modulus can be set in various ways, for example, the following can be:
in one embodiment, the hardness of the auxiliary retention portion is greater than the hardness of the portion of the shell-like body other than the auxiliary retention portion, e.g., the shore hardness of the auxiliary retention portion is 65D-80D, and the shore hardness of the shell-like body other than the auxiliary retention portion is 50D-75D; more specifically, the auxiliary retention portion has the hardness that is greater than the shell-shaped body except auxiliary retention portion, and this kind of setting method can be to tooth production correction force simultaneously for shell-shaped body of parcel tooth is more comfortable in the in-process of wearing, and the hardness of auxiliary retention portion is bigger in addition can prevent that shell-shaped tooth appliance from breaking in the in-process of plucking and wearing, strengthens the holistic practicality of shell-shaped tooth appliance, extension life cycle.
In another embodiment, the auxiliary retention portion is a multi-layer structure comprising a base layer and a reinforcing layer, wherein at least one reinforcing layer at least partially covers the base layer; more specifically, the elastic modulus of the reinforcing layer is greater than that of the base layer, and the material of the base layer may be one, two or more of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol), TPU (thermoplastic polyurethane) or PC (polycarbonate). It should be noted that the material of the auxiliary retaining portion and the material of the shell-like body may be the same or different, and when the material of the auxiliary retaining portion and the material of the shell-like body are the same, the two may be made of the same material with different elastic modulus.
In the multilayer structure, the elastic modulus of the reinforcing layer is larger than that of the base layer, so that the reinforcing layer with different elastic moduli can be selected in a targeted manner according to the age or intraoral condition of a patient, and the reinforcing layer with different elastic moduli can be used for targeted treatment.
Still further, the thickness of the auxiliary retaining portion formed by the multilayer structure may be made larger than the thickness of the portion of the shell-like body other than the auxiliary retaining portion, further for example, the thickness of the auxiliary retaining portion is 2 to 5mm, and the thickness of the portion of the shell-like body other than the auxiliary retaining portion is 0.5 to 1.5mm; the auxiliary retaining part has stronger strength than the shell-shaped body, is not easy to break when being taken off and worn, and is comfortable to wear on the premise of ensuring the correction force.
The shell dental appliances designed by the design method of the present invention can be used in any situation where further retention or less retention of teeth is desired, such as is common for example, where the shell dental appliances are used to increase the retention of a small crown.
In one embodiment, the shell dental appliance may also have the function of straightening teeth, in which case the shell body may also have a geometry that gradually repositions teeth from an initial position to a target straightening position, e.g., the shell body may be closely or identically aligned with the teeth of the target straightening position. The initial position of the teeth can be the initial position of the teeth to be corrected or the position before correction in the tooth correction process, and the target correction position of the teeth can be any position which is closer to the correction target than the initial position. When the patient wears the shell-shaped dental appliance, the shell-shaped body 11 not only has the function of wrapping teeth, but also has the function of moving and correcting the teeth, for example, the shell-shaped body has the function of increasing the clamping force, and simultaneously has the effect of moving and correcting the teeth, so that the correction efficiency is improved in a staged manner, and the correction efficiency is also improved for the whole correction scheme.
Example 2
The present embodiment provides a method for manufacturing a shell-shaped dental appliance, wherein a shell-shaped dental appliance digital model obtained by the design method of the shell-shaped dental appliance according to embodiment 1 is manufactured by hot-pressed film forming or additive manufacturing technology, so as to obtain the shell-shaped dental appliance.
For example, when the hot press film forming process is used for manufacturing, the specific manufacturing method comprises the following steps: 3D printing is carried out on the basis of the digital dental model and a series of intermediate digital dental models, a solid dental model is manufactured, then a shell-shaped dental appliance containing tooth shapes is obtained on the solid dental model in a hot press molding mode, and then the shell-shaped dental appliance containing the tooth shapes is obtained by cutting the shell-shaped dental appliance along a gum line or adjacent to the gum line.
For example, when manufacturing by using additive manufacturing technology, a specific manufacturing technology is to print and manufacture the designed shell-shaped dental appliance digital model by using a 3D printing method.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (14)
1. A method of designing a shell-shaped dental appliance, the method comprising the steps of:
acquisition of a digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital dental model and a digital gingival model;
cutting of digital dental model: dividing the digital dental model into an independent digital gingival model and a single digital dental crown model;
virtual design of the correction plan: virtually designing the single digital dental crown model to gradually change the single digital dental crown model from an initial position to a target correction position to obtain a series of intermediate digital dental jaw models;
design of shell-shaped tooth appliance digital model: designing a shell dental appliance digital model such that the shell dental appliance comprises a shell body having a cavity accommodating a plurality of teeth and such that the shell body is further provided with an auxiliary retention portion between the cavities accommodating two adjacent teeth, the auxiliary retention portion being designed with a geometry providing retention force that causes the shell body to firmly wrap around the plurality of teeth.
2. The method of designing a shell dental appliance of claim 1, wherein the auxiliary retention portion along with the tooth-receiving cavity is securely wrapped about 70% -100% of the area of a single tooth.
3. The method of designing a shell-like dental appliance of claim 1, wherein the auxiliary retention feature is designed as a geometrical structure concave inward toward the interproximal tooth and/or gingival directions.
4. The method of designing a shell-like dental appliance of claim 3, wherein the auxiliary retention portion is provided at a portion of the shell-like body adjacent to one side of gums and/or adjacent to a tooth gap between two adjacent teeth.
5. The method of claim 4, wherein the auxiliary retention portion is configured as a filling portion that is recessed toward the tooth gap and is capable of filling the tooth gap when the auxiliary retention portion is disposed at the tooth gap between two adjacent teeth.
6. The method of designing a shell-like dental appliance according to claim 5, wherein the filling part is designed as a plate-like structure connecting cheek/tongue sides or labial/lingual directions between tooth gaps, or the filling part is designed as a concave structure provided along cheek/lingual or labial/lingual directions between tooth gaps, the concave structure at least partially covering proximal/distal surfaces of adjacent two teeth.
7. The method of claim 4, wherein the auxiliary retention portion is configured to include a first connection portion, a second connection portion, and a transition connection portion when the auxiliary retention portion is disposed on a side of the shell body adjacent to the gum, the first connection portion being connected to a cavity of the shell body surrounding one tooth, the second connection portion being connected to a cavity of the shell body surrounding an adjacent tooth of the one tooth, the transition connection portion connecting the first connection portion and the second connection portion.
8. The method of designing a shell-like dental appliance of claim 7, wherein the auxiliary retention portion is designed as a concave triangular structure surrounding the gingival papilla and shaped to conform to the shape of the gingival papilla.
9. The method of designing a shell-like dental appliance according to claim 7 or 8, wherein the distance of the auxiliary retention portion from the gingival papilla is designed to be 0.1 to 0.6mm.
10. The method of designing a shell-like dental appliance of claim 1, wherein the auxiliary retention portion is provided on the lingual side, or labial/buccal side, or lingual side and labial/buccal side of the shell-like body.
11. The method of claim 1, wherein the auxiliary retention feature is provided in an anterior or posterior region of the shell body or in both.
12. The method of designing a shell-like dental appliance of claim 1, wherein the auxiliary retention portion has a modulus of elasticity that is greater than a modulus of elasticity of a portion of the shell-like body other than the auxiliary retention portion.
13. The method of designing a shell dental appliance of claim 1, wherein the shell dental appliance is used to increase the retention of a short crown; the shell-like body is designed to have a geometry that gradually repositions the teeth from an initial position to a target appliance position.
14. A method for manufacturing a shell-shaped dental appliance, characterized in that a shell-shaped dental appliance digital model obtained by the design method of the shell-shaped dental appliance according to any one of claims 1 to 13 is manufactured by hot-press film forming or by additive manufacturing technology, so as to obtain the shell-shaped dental appliance.
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