Digital indirect bracket bonding method based on 3D printing

Abstract

The invention discloses a digital indirect bracket bonding method based on 3D printing. The digital indirect bracket bonding method includes the following steps of: obtaining a digital dentition modelof a patient; accurately positioning a bracket in three-dimensional design software, carrying out outputting and 3D printing of a three-dimensional dentition model with the bracket; manufacturing a transfer tray; and placing the transfer tray on the dental surface of the patient after the transfer tray is internally provided with a bracket and carrying out conventional bonding. When a bracket ofwhich the undercut is not removed is used, an undercut is easily generated on a film pressing type transfer tray; a dislocation force is generated when the transfer tray is removed, and consequently the bonding interface of the bracket is damaged, which causes bonding failures. The undercuts in the gingiva direction and the occlusal surface (or incisal edge) direction are removed so as to preventthe generation of undercuts which cause bonding failures. 1 / 2 of the brackets with undercuts below the ligature wing in the proximal and distal directions are retained, so that the brackets are prevented from falling off easily after being placed in the transfer tray. Due to the design of removing partial undercuts, the falling-off rate of the bracket after bonding is reduced; the bracket is prevented from falling off in clinical operation; and meanwhile, due to the adoption of a full-package transfer tray, the bonding transfer accuracy is guaranteed.

Description

【Technical field】 [0001] The invention belongs to the technical field of orthodontics, and relates to a digital bracket indirect bonding method based on 3D printing. 【Background technique】 [0002] Contemporary fixed appliances have developed from the E-shaped bow, the nail tube bow, and the strip bow invented by Edward Angle to the square wire bow appliance. Because the square wire appliance can precisely control the crown and root in the three-dimensional direction, it has gradually become the mainstream of the fixed appliance. However, due to the use of the same bracket on all teeth, precise control of the teeth requires bending the first, second and third series of bends and other complex curves on stainless steel square wires of different sizes, which increases the orthodontist's workload. clinical workload. In the 1980s, Dr. Andrews improved the brackets based on the characteristics of each tooth, reduced the repeated bending of the arch wire to compensate for the an...

AI Technical Summary

Problems solved by technology

[0008] 1. The existing digital bracket indirect bonding technology needs to consider two issues at the same time: bonding loss rate and bonding accuracy

If the bonding accuracy is improved, the transfer tray will hold the bracket tightly, and the bracket will easily fall off when the transfer tray is taken out of the mouth during the bonding process

On the other hand, if the bracket drop-off rate is low, the bracket is easy to fall off from the transfer tray, and the bonding accuracy will be reduced during the bonding process.

Both aspects will affect the clinical correction effect

[0009] 2. The existing digital indirect bonding tray formed by direct 3D printing requires bonding of individual teeth in sequence, which takes a lot of time in clinical practice and does not have the advantage of saving chair time

Moreover, the materials required for printing must meet certain strength and elasticity at the same time, and the price is relatively expensive, which increases the financial burden of patients

[0010] 3. Most of the methods to obtain three-dimensional models are three-dimensional scanning of plaster models, and the evaluation of the accuracy of indirect bonding transfer of brackets can only be carried out by intraoral scanning

However, due to the influence of factors such as air humidity, temperature, and water-powder ratio of impression materials in the production of plaster models, the plaster models may be deformed and inconsistent with the final intraoral scan model after bonding, making model registration difficult and difficult to evaluate. Groove Transfer Accuracy

[0011] 4. Due to the undercuts of the brackets in the gingiva, incisal edge / cusp, and mesio-distal direction, if a fully-wrapped transfer tray is used, the bracket bonding will be destroyed when the transfer tray is dislocated. Most of the existing design methods use The method of adding an additional retention device, this additional component will increase the workload of the laboratory, bring inconvenience to clinical operations, and hinder the development of digital indirect bonding

Images