CN-115770113-B - Jaw pad design method, invisible appliance manufacturing method and invisible appliance

CN115770113BCN 115770113 BCN115770113 BCN 115770113BCN-115770113-B

Abstract

The invention discloses a jaw pad design method, an invisible appliance manufacturing method and an invisible appliance, and belongs to the technical field of tooth correction. The design method comprises the steps of obtaining a digital dental model, constructing a second occlusion model according to the first occlusion model, wherein the second occlusion model comprises complete occlusion relation information and occlusion space parameters, determining a jaw pad setting area according to a comparison result of the occlusion space parameters and a preset occlusion threshold value, and forming a jaw pad on the jaw pad setting area, wherein the jaw pad is a structure which is formed by tightly connecting a plurality of ellipsoidal structures and can open occlusion of rear teeth. The disclosed method of manufacturing the invisible appliance and the corresponding invisible appliance are based on the disclosed design method. The invention can design the appliance with reasonable structure under the condition of not depending on experience of designer.

Inventors

LIU DAPENG
ZHENG YANFANG
YANG KANG
ZHOU MI

Assignees

上海麦牙科技有限公司
上海微云实业集团有限公司

Dates

Publication Date: 20260508
Application Date: 20221124

Claims (7)

1. A method of designing a jaw pad, comprising: acquiring a digital dental model, wherein the digital dental model at least comprises an upper jaw model, a lower jaw model and a first occlusion model, and the first occlusion model has partial occlusion relation information; Constructing a second occlusion model according to the first occlusion model, wherein the second occlusion model is composed of the upper jaw model and the lower jaw model, the second occlusion model comprises complete occlusion relation information, and the occlusion relation information at least comprises occlusion space parameters; Determining a jaw pad setting area according to a comparison result of the occlusion space parameter and a preset occlusion threshold value, forming a jaw pad on the jaw pad setting area, wherein the jaw pad is a structure which is formed by tightly connecting a plurality of ellipsoidal structures and can occlude and open rear teeth, and the jaw pad comprises: Projecting the jaw pad setting area on an occlusal plane along the occlusal direction to obtain the area and the shape of the projection area; recognizing the curved surface shape of the occlusal surface of the jaw pad setting area; Generating the quantity and arrangement of the ellipsoidal structures according to the shape parameters of the ellipsoidal structures and the areas and the shapes of the projection areas, wherein the ellipsoidal structure fusion of the concave areas is larger than that of the ellipsoidal structures at other positions, and the projection area of the whole jaw pad on the occlusal plane along the occlusal direction is larger than 80% of the projection area of the jaw pad setting area; The occlusion relation information also comprises an occlusion type, and the design method determines structural parameters and arrangement of the ellipsoidal structure according to the occlusion type.
2. The method of designing a bite block according to claim 1, wherein determining a bite block setting area based on a comparison result of the bite space parameter and a preset bite threshold value comprises: When the occlusion space parameter is smaller than a first occlusion threshold, the jaw pad is arranged on the upper jaw or the lower jaw; When the occlusion space parameter is greater than or equal to a first occlusion threshold, the jaw pad is arranged on the upper jaw and the lower jaw, and the jaw pad on the upper jaw is matched with the jaw pad on the lower jaw; When the occlusion space parameter is smaller than a second occlusion threshold, the jaw pad is arranged on each of the left and right sides of the corresponding dental jaw; when the occlusion space parameter is greater than or equal to a second occlusion threshold, the jaw pad is disposed on at least one molar on the left and right sides of the corresponding dental jaw.
3. The method according to claim 2, further comprising determining an ellipsoidal structural shape parameter from the bite space parameter and the jaw pad placement area.
4. The method of claim 3, further comprising determining an arrangement of the plurality of ellipsoids based on the shape parameters of the ellipsoids and occlusal surface information.
5. The method of designing a jaw pad according to any one of claims 1-4, further comprising taking an intraoral photograph, calibrating a second occlusion model based on the intraoral photograph.
6. A method for manufacturing a concealed appliance, characterized in that a digital dental model provided with a jaw pad is obtained by using the method for designing a jaw pad according to any one of claims 1 to 5.
7. An invisible appliance is characterized by comprising a first shell-shaped body for accommodating upper teeth and a second shell-shaped body for accommodating lower teeth, wherein according to occlusion space parameters, at least the first shell-shaped body or the first shell-shaped body is provided with a jaw pad designed by the design method of any one of claims 1-5, and the jaw pad is a structure which is formed by tightly connecting a plurality of ellipsoidal structures and can open occlusion of rear teeth.

Description

Jaw pad design method, invisible appliance manufacturing method and invisible appliance Technical Field The invention belongs to the technical field of orthodontics, and particularly relates to a jaw pad design method, an invisible appliance manufacturing method and an invisible appliance. Background The jaw pad is a commonly used structural accessory in the field of traditional orthodontics, and can be used for keeping the upper jaw and the lower jaw in an open state and relieving interference between upper teeth and lower teeth so as to assist the dental appliance in correcting teeth. For a variety of tooth deformities, such as anterior teeth open and close (fig. 1 (a)), anterior teeth close (fig. 1 (b)), posterior teeth close (fig. 1 (c)), posterior teeth close (fig. 1 (d)), deep close (fig. 1 (e)), etc., occlusion needs to be opened by a jaw pad, and in some orthodontic techniques, an orthodontic force system is provided by a jaw pad to assist in correcting the jaw. When designing the jaw pad, a physician with abundant experience is usually required to design a more reasonable jaw pad, which leads to higher experience requirements for an stomatologist, relatively lower design efficiency, and possibly unreasonable structure, and the jaw pad is easy to wear. As for the jaw pad, one form which is currently very commonly used in the orthodontic field is to form a jaw pad structure directly on a shell-shaped dental appliance, but it has been found through researches that the jaw pad structure is easily worn out, causing damage to the appliance. Disclosure of Invention Aiming at the problems existing in the current jaw pad design, the invention provides a jaw pad design method to reduce excessive dependence on experience of designers, thereby efficiently designing the jaw pad with reasonable structure. A method of manufacturing an invisible appliance based on the provided design method and a corresponding invisible appliance are also provided. In view of the foregoing, a first aspect of the present invention provides a method for designing a jaw pad, including: acquiring a digital dental model, wherein the digital dental model at least comprises an upper jaw model, a lower jaw model and a first occlusion model, and the first occlusion model has partial occlusion relation information; Constructing a second occlusion model according to the first occlusion model, wherein the second occlusion model is composed of the upper jaw model and the lower jaw model, the second occlusion model comprises complete occlusion relation information, and the occlusion relation information at least comprises occlusion space parameters; And determining a jaw pad setting area according to a comparison result of the occlusion space parameter and a preset occlusion threshold value, and forming a jaw pad on the jaw pad setting area, wherein the jaw pad is a structure which is formed by tightly connecting a plurality of ellipsoidal structures and can occlude and open the rear teeth. In some embodiments, the jaw pad setting area is determined from a comparison of the bite space parameter to a preset bite threshold: When the occlusion space parameter is smaller than a first occlusion threshold, the jaw pad is arranged on the upper jaw or the lower jaw; When the occlusion space parameter is greater than or equal to a first occlusion threshold, the jaw pad is arranged on the upper jaw and the lower jaw, and the jaw pad on the upper jaw is matched with the jaw pad on the lower jaw; When the occlusion space parameter is smaller than a second occlusion threshold, the jaw pad is arranged on each of the left and right sides of the corresponding dental jaw; when the occlusion space parameter is greater than or equal to a second occlusion threshold, the jaw pad is disposed on at least one molar on the left and right sides of the corresponding dental jaw. In some embodiments, the design method further comprises determining an ellipsoidal structural shape parameter from the bite space parameter, the jaw pad placement region. In some embodiments, the design method further comprises determining the arrangement of a plurality of ellipsoidal structures according to the ellipsoidal structure shape parameters and the occlusal surface information of the teeth. In some embodiments, the determining the arrangement of the ellipsoidal structures according to the ellipsoidal structure shape parameter and the occlusal surface information comprises: Projecting the jaw pad setting area on an occlusal plane along the occlusal direction to obtain the area and the shape of the projection area; recognizing the curved surface shape of the occlusal surface of the jaw pad setting area; And generating the quantity and arrangement of the ellipsoidal structures according to the shape parameters of the ellipsoidal structures and the areas and the shapes of the projection areas, wherein the ellipsoidal structure fusion of the ellipsoidal structures positioned in the concave a