Correcting device and correcting method for traction and straightening of free-end impacted molars

Abstract

The invention discloses a correcting device and a correcting method for traction and straightening of free-end impacted molars. The correcting device comprises an anchor type hook, an elastic tractionpiece and a traction assembly, the anchor type hook comprises a sticking bottom plate, a connecting column and a plurality of traction hooks; one end of the connecting column is connected with the sticking bottom plate; the other end of the connecting column is connected with the plurality of traction hooks; the traction component comprises retention occlusal rests, cantilever arms and a connecting body; the retention occlusal rest is attached to a specified support tooth; the two cantilever arms extend out of the retention occlusal rests towards the far-middle direction; the two cantilever arms are respectively positioned on the buccal-lingual sides of a simulated eruption track of the impacted molar; each cantilever arm is provided with a plurality of suspension buttons; the connectingbody is positioned on the maxillary palate side or the mandibular lingual side; the connecting body is connected with the retention occlusal rests on two sides; one end of the elastic traction piece is connected with a traction hook; and the other end of the elastic traction piece is connected with the suspension buttons. The correcting device and correcting method are suitable for most free-end impediment molars, and particularly has obvious advantages for complex cases with low horizontal impaction and severe buccal-lingual inclination.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an orthodontic device for pulling impacted molars at a vertical free end and an orthodontic method. Background technique [0002] In clinical orthodontics, impacted molars, especially impacted free molars, are common malocclusions. The highest incidence rate is the mandibular third molar, and then the maxillary third molar. There are also impacted second molars at the free end, and even the first and second molars are impacted together. This not only affects the occlusal function, but also may affect the adjacent teeth. , affect the stability of the jaw teeth, and even the entire oral and jaw system. [0003] In an orthodontic design, usually at least two molars are retained to perform masticatory function and maintain intermaxillary height. For congenitally impacted first and / or second molars, orthodontists must try their best to promote eruption to improve function; f...

AI Technical Summary

Problems solved by technology

[0004] Compared with the impacted teeth in the middle of the dentition, the vertical traction of impacted molars at the free end is more complicated and difficult

The main reasons are as follows: ① Most of the impacted molars at the free end are multi-rooted teeth, which may be impacted in all directions in the mesio-distal buccolingual direction, and the bone at the distal end is relatively dense, so the situation is complicated; Extremely limited space for surgical exposure or orthodontic manipulation

③In terms of biomechanics, when the molars are vertical, it is difficult for the mesial single-ended teeth to provide effective anchorage, and it is difficult to achieve three-dimensional control in multi-directional traction such as distal, occlusal, or buccolingual

①Because the buccal tube and other accessories need to be bonded on the buccal surface, more crowns need to be exposed, so it is basically only suitable for mild and moderate oblique median impaction; Poor; ③If the segmental arch extends to the gingiva, it may cause gingival damage; ④Insufficient anchorage

①It is only suitable for the molars that are basically upright; ②The manufacturing process is complicated; ③It is difficult to control the magnitude and direction of the magnetic force; ④The gradually increasing fit pad feels more uncomfortable

①Only suitable for mandibular mesial impacted molars; ②It is difficult to apply buccal-lingual and occlusal forces; ③Bent archwires are in point contact with impacted teeth (or accessories), and it is difficult to precisely control the size and direction; ④If the molars at the free end are inserted Mesioproximal space, which can lead to periodontal damage

①It is only limited to mesial or horizontal impacted mandibular molars, and cannot be applied to the upper jaw; ②The production is more complicated and requires manual bending and welding; ③The control of the buccolingual direction can be initially achieved but the accuracy is not good;

①It is an invasive operation, and there is a risk of microscrew loosening and breaking; ②The implantable site is limited, the direction of force is limited, and it is difficult to achieve occlusal traction on maxillary molars

[0011] To sum up, at present, there are various methods for traction of impacted molars at home and abroad, but the indications are limited, and there is no appliance that can achieve traction of molars at the free end of the upper and lower jaws in all directions; most of the devices need to be bent and welded by hand, which is technically difficult , the doctor takes a long time; and it is still lacking in the impact on adjacent tissues and the provision of continuous light force

Images