An impression tray for orthodontics

Abstract

An impression tray for orthodontics, which is composed of an arc-shaped sheet body capable of fitting with the dental arch space in the labial and buccal sides and the vestibular area, and a handle for supporting the arc-shaped sheet body. The cross-section of the arc-shaped sheet body is C-shaped, and a plurality of holes for temporarily holding impression material are provided on the arc-shaped sheet body. The arc-shaped sheet body has a C-shaped central side surface suitable for covering the lower teeth and the upper teeth simultaneously, and the top wall and the bottom wall of the arc-shaped sheet body are formed in a wavy curved surface manner suitable for the labial and buccal frenum parts. Thus, the impression tray can not only avoid excessive stimulation to the patient, but also is easy to demold, and is convenient for cleaning and disinfection.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, and particularly to an impression tray for making a vestibular shield for orthodontics. Background Art

[0002] In the impression technique for orthodontics, the tray is an important factor related to the quality of the impression. In the past, when taking an impression for a vestibular shield used in orthodontics, two impression trays, a lower tray and an upper tray, were required and taken in two separate steps, first the lower tray and then the upper tray. Moreover, the subjects of this disease are teenagers and children, and there are situations where they do not cooperate well, or even accidents such as vomiting caused by the tray irritating parts such as the tongue. Summary of the Invention

[0003] To solve the above problems, the purpose of the present invention is to provide an impression tray with a simplified structure, which can effectively improve the impression-taking efficiency and enhance the willingness of patients to cooperate.

[0004] According to the present invention, there is provided an impression tray for orthodontics, which is composed of an arc-shaped sheet body that can cooperate with the dental arch gap in the vestibular area on the labial and buccal sides and a handle portion for supporting the arc-shaped sheet body. The cross-section of the arc-shaped sheet body is C-shaped, and an impression material holding portion for temporarily holding impression material is provided inside the C-shape.

[0005] Preferably, the top wall and the bottom wall of the arc-shaped sheet body are formed in a wavy curved surface manner suitable for the labial and buccal frenum parts; and / or the arc-shaped sheet body has a C-shaped inner surface suitable for simultaneously covering the lower teeth and the upper teeth.

[0006] Preferably, the arc-shaped sheet body and the handle portion are integrally formed; or the arc-shaped sheet body and the handle portion are formed in a combined manner. The arc-shaped sheet body has a fitting hole portion, and the handle portion has a rod portion and a head with a cross-sectional dimension larger than that of the rod portion. The rod portion can pass through the fitting hole portion from the inside of the C-shape of the arc-shaped sheet body so that the head is fitted into the fitting hole portion.

[0007] Preferably, a recess for temporarily holding impression material is formed on the top end surface of the head and / or the head is formed with a through hole extending from the top end surface towards the rod portion; or the recess is formed as the through hole.

[0008] Preferably, the impression material holding portion includes holes and / or uneven portions formed on the arc-shaped sheet body.

[0009] Preferably, the holes on the bottom side of the arc-shaped sheet body are provided with pin posts or movable rivets that can be in clearance fit with them.

[0010] Preferably, the arc-shaped sheet body has a main sheet body and a sub-sheet body provided with a plugging pin, and the plugging pin can be plugged into a hole at a corresponding position on the main sheet body.

[0011] Preferably, the arc-shaped sheet body includes a connecting portion formed on the back side of the "C" shape for connecting with the end of the handle portion.

[0012] Preferably, both the arc-shaped sheet body and the handle portion are made of metal sheets, and they are fixed by riveting or reversibly connected via magnetic elements.

[0013] Preferably, the arc-shaped sheet body is composed of a main body portion with a dovetail groove recessed upward on the bottom side and a slider that can be embedded in the dovetail groove and slide.

[0014] The impression tray according to the present invention can not only avoid excessive stimulation to the patient, but also complete impression taking at one time, is easy to demold, and is convenient for cleaning and disinfection. Description of the Drawings

[0015] Figure 1 Schematically shows a three-dimensional structural view of the impression tray according to an embodiment of the present invention.

[0016] Figure 2 Schematically shows a curved surface structural view of the upper and lower edges of the impression tray according to an embodiment.

[0017] Figure 3 (A) and (B) thereof schematically show a combined structural view of the impression tray according to a modification.

[0018] Figure 4 (C) and (D) thereof schematically show a telescopic structural view of the impression tray according to a modification.

[0019] Figure 5 Schematically shows a combined accessory structural view of the impression tray according to a modification.

[0020] Figure 6 (E) and (F) thereof respectively show the upper and lower impression-taking structures of an existing impression tray. Detailed Description of the Invention

[0021] The exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The exemplary embodiments described below and shown in the drawings are intended to teach the principles of the present invention so that those skilled in the art can implement and use the present invention in several different environments and for several different applications. Therefore, the protection scope of the present invention is defined by the appended claims, and the exemplary embodiments are not intended to, and should not be considered as, a restrictive description of the protection scope of the present invention. Moreover, for the convenience of description, the sizes of the various parts shown in the drawings are not necessarily drawn according to the actual proportional relationship, the same elements are represented by the same or similar reference numerals, and in some drawings, conventional structures or local structures are omitted for easy observation. Regarding the orientation description, such as the orientation or positional relationship indicated by up, down, back, inside, top, bottom, etc., may be based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the proximal side and the distal side refer to the positional relationship relative to the impression operator, the cross-sectional direction corresponding to the patient's body is the transverse direction, and the direction where the sagittal plane or the coronal plane perpendicular to the transverse direction is the longitudinal direction. The following description of each embodiment emphasizes the differences between the various embodiments, and their similarities can be referred to each other. For the sake of brevity, they will not be repeated one by one, and the technical features in the different embodiments can be freely combined according to the design needs to form more embodiments.

[0022] Figure 6 There is shown an existing impression tray 20. In the middle part of the bottom surface surrounded by its outer peripheral wall 24, there are respectively formed a raised portion 21 and two tongue wings 22. When taking an impression by placing impression material in the channel 23 formed along the inner side of the outer peripheral wall 24, the structures of such a raised portion 21 and tongue wings 22 will stimulate the tongue and the palatal elevation part in the oral cavity, thereby causing discomfort to the patient, and even leading to vomiting or a decrease in the willingness to cooperate.

[0023] In contrast, according to the present invention, as Figures 1 to 5 shown in the embodiments or variants of

[0024] Figure 1 An impression tray 1 as shown has a labial and buccal side arcuate sheet body 2 for uniformly press-fitting with the patient's dental arch in a state of holding the impression material, and a handle portion 3 for holding and supporting the arcuate sheet body 2. A plurality of holes 4 for temporarily holding the impression material are formed through the arcuate sheet body 2.

[0025] The arcuate sheet body 2 is a curved plate having a C-shaped cross-section, and the transverse circumference is adapted to cover at least several teeth in the vestibular area; the longitudinal section may be Figure 1The rectangle shown is not limited thereto, and may also be a curved plate shape with the central side concave proximally relative to the peripheral side, suitable for covering both the mandibular and maxillary teeth.

[0026] like Figure 2 As shown in the front view of the unfolded view, the top wall and the bottom wall of the arc-shaped sheet 2 are constructed in a wavy curved surface manner suitable for the lip and cheek frenulum of the patient. That is, the upper top edge (corresponding to the upper lip side) and the lower bottom edge (corresponding to the lower lip side) of the arc-shaped sheet 2 may have corresponding smoothly transitioned notches at the positions corresponding to the lip and cheek frenulum. The upper and lower sides of the arc-shaped sheet 2 are formed symmetrically, and in the concave structure along the outer surfaces of the upper top edge and the lower bottom edge, the distances of each wave crest and wave trough from the central part (for ease of understanding, the figure shows the shaded part) can be set to, for example, H1=H7=16mm, H2=H6=12mm, H3=H5=15mm, H4=10mm. Therefore, the peripheral shape and size of the arc-shaped sheet 2 are not limited to Figure 1 The rectangle shown can be set specifically as needed.

[0027] In this way, when taking a mold, alginate or other impression materials can be applied to the surface of the far side (also known as the center side of the C-shaped or the inner side of the C-shaped) of the arc-shaped sheet 2, and the hole 4 is used to increase the retention force of the impression material. The operator pinches the handle 3 to send the arc-shaped sheet 2 into the vestibule area of ​​the patient's mouth, presses the impression material on the mandibular teeth and maxillary teeth and maintains an appropriate material solidification time, then takes out the impression tray 1 from the mouth, demolds the solidified impression from the arc-shaped sheet 2, and accurately obtains the shape information of all or part of the dental arch in the vestibule area for subsequent vestibular shield production. As an example, a perfusion model can be used, which has a dental arch-shaped groove portion, and a cavity for placing the solidified impression is formed on one side of the groove portion, and a cavity for perfusing and forming a vestibular shield positive mold is formed between the impression surface placed in the cavity and the other opposite side of the groove portion. Optionally, a 3D scanner can be used to scan and obtain a corresponding digital model, and then the vestibular shield is produced by a 3D printing center.

[0028] As a variation, Figure 3 The arc-shaped sheet 2 and the handle 3 are combined into a structure that is separate from each other, so that the selected or replaced arc-shaped sheet has a configuration that is consistent with the patient's dental arch, and can be adapted to individual differences of the patient by referring to the individual patient's oral vestibule and the labial and buccal surfaces of the dental arch. Figure 3 As shown in (A), the arc-shaped sheet 2 has a fitting hole 7; Figure 3 As shown in (B), the handle 3 has a rod portion 34 and a head portion 31 whose cross-sectional size is larger than that of the rod portion 34. The rod portion 34 can pass through the fitting hole portion 7 from the inner side of the arc-shaped sheet 2 so that the head portion 31 can be reversibly fitted into the fitting hole portion 7, and at the same time, the handle 3 can be pinched on the back side (i.e., the proximal side) away from the center side of the C-shape.

[0029] Thus, when taking an impression, an appropriate arc-shaped sheet 2 can be selected for the patient and assembled with the handle 3 to perform the above-mentioned impression operation. When demolding, the handle 3 can also be pushed from the back side towards the inner side, and the top surface 35 of the head 31 facing the inner side is used to apply a demolding assist force, further suppressing the risk of the impression breaking during demolding.

[0030] Optionally, a recessed portion 32 for temporarily holding the impression material is formed on the top surface 35, thereby further increasing the holding force for the impression material.

[0031] Optionally, the head 31 is formed with a through hole 33 for temporarily holding the impression material extending from the top surface 35 towards the rod portion 34. Thus, when demolding, a push rod can also be passed through the through hole 33 from the side of the rod portion 34 to further apply a demolding assist force. Of course, the opening of the through hole 33 on the top surface 35 can overlap with the recessed portion 32 (i.e., be the same one).

[0032] As another variant, Figure 4 (C) of shows a partial longitudinal section of the arc-shaped sheet 2, Figure 4 (D) of shows a front view observed from the distal side. As can be seen from the figure, the arc-shaped sheet 2 includes a main body portion having a dovetail groove 5 recessed upward on the bottom side and a slider 6 that can be embedded in the dovetail groove 5 and slide.

[0033] Thus, the slider 6 can partially slide out of the dovetail groove 5 towards the distal side, so that the extended portion can be used to further increase the holding force for the impression material, facilitating further prevention of the impression material from falling off, and thus further reducing the requirement for the fluidity of the impression material. More specifically, when applying an impression material with relatively high fluidity to an individual patient, a part of the slider 6 can be pushed out of the dovetail groove 5 from the proximal side towards the distal side. When placed in the vestibular area, the extended portion is pushed back towards the proximal side by the resistance of the mandibular area, which can prevent discomfort to the patient caused by the pressure of the extended portion. Moreover, at this time, the material holding force of the extended portion is no longer required. Preferably, the length W1 of the above-mentioned extended portion is greater than or equal to the length of the gap portion on the proximal side of the dovetail groove 5. In other words, the length of the slider 6 in the sliding direction is less than or equal to the dovetail groove 5, but is not limited thereto.

[0034] Optionally or alternatively, when the hole 4 on the bottom side of the arc-shaped sheet 2 is a through hole, it can also have a pin or rivet that can be in clearance fit with it. The pin can extend towards the inner side of the C shape in the hole 4 in the same manner as the above-mentioned slider 6 and can be pushed back in the reverse direction when subjected to resistance. In the case of a rivet, a spacer can be pre-set on one end face side of the hole 4 and the spacer can be removed after embedding the rivet, which can then become a movable rivet, so that it can first be used to hold the impression material and then can be pushed back under force.

[0035] In addition, the connection manner between the arc-shaped sheet body and the handle is not limited to the above, and the two can also be integrally formed. Moreover, the two can also be configured such that a connection portion for connecting with the end portion of the handle is formed on the back side of the arc-shaped sheet body, thereby forming an interlockable reversible connection. In addition, the two can be made of deformable materials such as thermoplastic materials or flexible resins. For example, common low-temperature thermoplastic materials can be used, which can be plastically deformed in a personalized manner after being softened. Of course, the arc-shaped sheet body and the handle can also be made of metal sheets. In this case, the two can be fixed by riveting, or a reversible (detachable) connection can be formed between the two through magnetic elements.

[0036] The above takes the hole 4 as an example to illustrate the impression material holding portion. The hole 4 is preferably a through hole but can also be a blind hole. In addition, the slider 6 also serves as an impression material holding portion at the same time, but is not limited thereto. Other mechanisms for increasing the adhesion and gripping force of the impression material can also be provided inside, such as the rough surface or the hook surface of Velcro, a rough frosted surface, knurling, and reticulation, which are collectively referred to as the uneven portions herein.

[0037] As a variant Figure 5 It is shown that the arc-shaped sheet body has a combined structure of a main sheet body (corresponding to the arc-shaped sheet body 2 Figure 1 ) and a sub-sheet body 10. The sub-sheet body 10 serves as an extension sheet of the main sheet body. A tapered insertion pin 8 is provided on a fitting portion 9 such as a step on the lateral end side, and can be inserted into a corresponding hole 4 on the main sheet body, so as to appropriately extend the lateral span of the main sheet body to adapt to the conditions of different patients. In this case, the corresponding hole 4 on the main sheet body actually serves two functions: the impression material holding function when not extended and the extension fitting hole function.

[0038] Thus, according to the present invention, the C-shaped curved plate surface is different from the traditional tray in that it includes not only the outer peripheral wall but also the U-shaped bottom surface and the channels thereon. When taking an impression, it is not necessary to touch the lingual side, which can significantly improve the user experience.

[0039] In the description of the present application, the meaning of "a plurality of" is more than two, unless otherwise clearly and specifically defined. Unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. Although the present invention has been described with reference to various specific embodiments, it should be understood that modifications can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. An impression tray for orthodontics, characterized in that, It is composed of an arc-shaped sheet body capable of cooperating with the dental arch space in the labial and buccal sides and the vestibular area, and a handle for supporting the arc-shaped sheet body. The cross-section of the arc-shaped sheet body is C-shaped, and an impression material holding part for temporarily holding the impression material is provided inside the C shape. The impression material holding part includes holes and / or concave and convex parts formed on the arc-shaped sheet body; The arc-shaped sheet body and the handle are formed in a combined manner. The arc-shaped sheet body has a fitting hole part, and the handle has a rod part and a head with a cross-sectional dimension larger than that of the rod part. The rod part can pass through the fitting hole part from the inside of the C shape of the arc-shaped sheet body so that the head can be reversibly fitted into the fitting hole part; A through hole extending from the top end surface in the direction of the rod part is formed on the head; The arc-shaped sheet body is composed of a main body part with a dovetail groove recessed upward on the bottom side and a slider capable of sliding and fitting into the dovetail groove. The slider (6) can partially slide out of the dovetail groove (5) toward the distal side in such a way that a part of the slider (6) is pushed out of the dovetail groove (5) from the proximal side to the distal side. When the arc-shaped sheet body is placed in the vestibular area, the pushed-out part of the slider (6) is pushed back to the proximal side by the resistance of the mandibular area.

2. The impression tray for orthodontics according to claim 1, characterized in that, The top wall and the bottom wall of the arc-shaped sheet body are formed in a wave-shaped curved surface suitable for the labial and buccal frenum parts; and / or the arc-shaped sheet body has a C-shaped inner surface suitable for covering the lower teeth and the upper teeth at the same time.

3. The impression tray for orthodontics according to claim 1, characterized in that, A recessed part for temporarily holding the impression material is formed on the top end surface of the head.

4. The impression tray for orthodontics according to claim 3, characterized in that, The recessed part is formed as the through hole.

5. The impression tray for orthodontics according to claim 1, characterized in that, A pin or a movable rivet capable of having a clearance fit with the hole on the bottom side of the arc-shaped sheet body is provided.

6. The impression tray for orthodontics according to claim 1, characterized in that, The arc-shaped sheet body has a main sheet body and a sub-sheet body provided with a plug pin, and the plug pin can be plugged into a hole at a corresponding position on the main sheet body.

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