A molar anchorage control method for invisible orthodontic treatment of tooth extraction cases

Abstract

The invention discloses a molar anchorage control method for invisible orthodontic extraction cases. The method comprises the following steps that 1, a basic virtual model of the number of to-be-corrected teeth of the upper jaw and the lower jaw is obtained, and initial positions of maxillary molars and mandibular molars are determined on the basic virtual model separately; 2, on the basis of the initial positions of the maxillary molars and the mandibular molars, target positions of the maxillary molars and the mandibular molars moving to the distal are determined separately; 3, the maxillary molars and the mandibular molars are made to tilt to the distal to the reach the corresponding target positions from the initial positions through an invisible bracketless appliance. Accordingly, control in the three-dimensional direction of anchorage molars can be achieved conveniently without any assisted segmental arch technique or extraoral force; molar crowns can be made to tilt to the distal only through the action of the invisible bracketless appliance; the angle of the molars tilting to the distal can be accurately controlled; anterior teeth can be effectively adducted by controlling anchorage, and a good treatment effect on correction for anterior teeth protrusion or anterior teeth crowding cases is achieved.

Description

technical field [0001] The invention relates to a tooth anchorage control method, in particular to a molar anchorage control method for invisible orthodontic tooth extraction cases. Background technique [0002] Bracketless clear aligner is a transparent laminated orthodontic device based on computer-aided design (CAD) and computer-aided manufacturing (CAM). It continuously adjusts the position of teeth through a series of clear aligners to correct various malformations Jaw deformity and establish a good tooth cusp-socket relationship. For invisible orthodontics without brackets, the cases that require tooth extraction are low predictability cases, that is, clinicians are required to have rich experience in invisible orthodontics, and difficult cases even require the use of fixed appliances to obtain better results . [0003] In recent years, with the development of bracketless clear aligner technology, the scope of application of bracketless clear aligner has gradually ex...

AI Technical Summary

Problems solved by technology

However, due to the complex correction process of Tweed and Tweed-Merrifield correction techniques, more arch wires are needed for bending and external force is required, Tweed and Tweed-Merrifield correction techniques are not widely used in current orthodontic clinical correction

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