Two-dimensional maxillary molar moving device

Abstract

The invention provides a two-dimensional maxillary molar moving device, and relates to the field of orthodontic instruments. The two-dimensional maxillary molar moving device comprises left and rightretention parts and a stressing part; the left and right retention parts are respectively arranged at the left and right sides of the palatal suture; the stressing part is connected with the left andright retention parts; each retention part comprises a metal crown covering the first molar, and a retention plate with a transverse groove in the middle; the metal crown and the retention plate are arranged at the same side of the palatal suture, and connected through a steel wire; the buccal side of the metal crown is connected to an implant nail sleeve corresponding to the maxillary zygomatic alveolar ridge; and two sagittal ends of the retention plate are respectively provided with stressing part installation holes. The retention parts in the invention can be appressed to the palatal mucous membrane to the most extent; a micro implant nail can be implanted in bone to the most extent; the failure risk in the stressing process of the micro implant nail can be reduced; and furthermore, ina correction process, the transverse enough width change of the maxillary can be realized without disassembling the micro implant nail.

Description

technical field [0001] The invention relates to the field of orthodontic instruments, in particular to a clinical two-dimensional maxillary molar moving device. [0002] technical background [0003] Protruding upper dentition with narrow upper dental arch is relatively common in clinical practice. For narrow upper dental arch, the current expansion methods include: fast spiral expander, knight bow and four-eye coil spring. For the rapid expansion of the adult arch, it is often necessary to expand the arch with micro-implant screws on both sides of the palatal suture, so as to avoid the buccal inclination of the upper posterior teeth caused by the direct use of the rapid expansion device. The current bony rapid expander on the market directly connects the micro-implant nails and the expander. For cases with obvious dental arch stenosis, there are problems in choosing to use this type of rapid expander: (1) The palatal vault is too narrow, The selected expander can only be as...

AI Technical Summary

Problems solved by technology

The current bony rapid expander on the market directly connects the micro-implant nails and the expander. For cases with obvious dental arch stenosis, there are problems in choosing to use this type of rapid expander: (1) The palatal vault is too narrow, The selected expander can only be as narrow as possible, but the amount of expansion of the narrow expander is limited, and it cannot meet the clinical needs at one time, that is, it is necessary to replace the wider expander when the expander reaches a certain level , replacement of the appliance requires re-implantation of micro-screws, on the one hand, it increases the pain of the patient, and on the other hand, it increases the risk of subsequent micro-screw implantation failure, and the clinical cost increases

(2) There is a large distance between the arch expander and the top of the palatal vault, and it is necessary to use special micro-implantation screws long enough to provide sufficient retention in clinical practice. There is a large distance between the screw threads, and the diameter of the micro-implantation screw is small, and there is a risk of the nail bending, breaking or falling off during the force application process

Images