Mandibular second molar torque control device

Abstract

The invention provides a torque controlling device of the mandibular second molar, and relates to the field of orthodontic instruments. The device comprises a mandibular first molar, first bottom plates, a bracket, a rotating part, a buccal tube, an NITI wire and a traction steel wire, wherein the mandibular first molar is attached to the side where the mandibular second molar is located; the first bottom plates are arranged on the buccal side surface of a mandibular second premolar; the bracket is attached to the lingual side surfaces of mandibular left and right first molars; the rotating part is arranged below the first bottom plates; the buccal tube is attached to the buccal side surface of the mandibular second molar; the NITI wire is arranged between the rotating part and the buccal tube; the traction steel wire is used for dragging the rotating part; the rotating part comprises a cannula which is parallel to the occlusal plane and a rotating shaft which penetrates through the cannula and can rotate in the cannula; a rotating disc is arranged at the mesial end part of the rotating shaft; a plurality of positioning parts are arranged on the rotating disc; two ends of the traction steel wire are connected with the positioning parts on the rotating disc and the mesial end parts of the first bottom plates; the distal end part of the rotating shaft is connected with the NITI wire. According to the device provided by the invention, the buccolingual torque of the mandibular second molar can be effectively adjusted.

Description

technical field [0001] The invention relates to the field of orthodontic appliances, in particular to a torque control device for mandibular second molars. Background technique [0002] In clinical orthodontics, some patients exhibit lingual inclination after the eruption of the mandibular second molars. From the perspective of occlusal relationship, it shows that the posterior teeth are covered or positively locked. This type of occlusal relationship can lead to inefficient chewing by the patient and even joint discomfort due to occlusal interference. The current correction methods include the use of wire bending to form a T-shaped curve, up-and-down interactive traction, or micro-implantation nail technology. Problems existing in forming a T-shaped curve by wire bending: Since the bent T-shaped curve is located between the first and second molars, but the space in this area is limited, the T-shaped curve often irritates the patient’s mucous membrane, and because its react...

AI Technical Summary

Problems solved by technology

Problems existing in forming a T-shaped curve by wire bending: Since the bent T-shaped curve is located between the first and second molars, but the space in this area is limited, the T-shaped curve often irritates the patient’s mucous membrane, and because its reaction force will Causes lingual inclination adjacent to first molar

The biggest problem with up-and-down interactive traction is the vertical component force generated, which will cause the mandible to rotate back and down, and ultimately affect the patient's facial shape

The micro-screw technique can improve the lingual inclination of the mandibular second molars while avoiding the elongation of the molars. However, it is difficult to choose the implant site because the vestibular groove on the buccal side of the second molars is very shallow. It is easy to stimulate soft tissue hyperplasia, and finally bury the implant nails

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