CN-121971190-A - Modular orthognathic postoperative dynamic limiting traction device based on invisible appliance

CN121971190ACN 121971190 ACN121971190 ACN 121971190ACN-121971190-A

Abstract

The invention discloses a modularized orthognathic postoperative dynamic limiting traction device based on an invisible appliance, which comprises an upper jaw invisible appliance and a lower jaw invisible appliance, wherein a guide ring is arranged on the cheek side of the upper jaw appliance, a palate rod is optionally arranged on the cheek side of the lower jaw appliance, a base is arranged on the cheek side of the lower jaw appliance, a limiting traction rod is detachably connected to the base, a detachable locking piece is arranged at the tail end of the traction rod, and the size of the locking piece is larger than the aperture of the guide ring. By selecting traction rods with different lengths or performances and changing the connection positions of the traction rods, the device can be modularly configured into four states, namely an early near-rigid braking state, a class II traction state in which the lower jaw is guided forwards, a class III traction state in which the lower jaw is guided backwards, and a fourth state in which elastic traction is realized through a button-like structure matched with rubber bands. Solves the problems that the traditional bite plate is not detachable and can not be cleaned, has the functions of detachable cleaning, dynamic limiting and active guiding, and is also suitable for different scenes of the whole block/block operation of the upper jaw.

Inventors

ZHANG QIAN
ZHANG KUN
WANG YUXIN
Wen Yunzhang
WANG ZISHUO

Assignees

南京市口腔医院

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. Modular orthognathic postoperative dynamic limit traction device based on invisible appliance, which is characterized by comprising: A maxillary invisible appliance (1) and a mandibular invisible appliance (2); one or more guide rings (11) are arranged on the cheek side of the upper jaw invisible appliance (1); The palate side of the upper jaw invisible appliance (1) is selectively provided with a palate transverse rod (12), and the palate transverse rod (12) is connected with the left side and the right side of the upper jaw invisible appliance (1); One or more bases (21) corresponding to the guide rings (11) are arranged on the cheek side of the mandibular invisible appliance (2), and a limit traction rod (22) is detachably connected to the bases (21); the tail end of the limiting traction rod (22) is provided with a detachable locking piece (23), and the size of the locking piece (23) is larger than the aperture of the guide ring (11).
2. The device according to claim 1, characterized in that the guide ring (11) is arranged in the anterior or posterior region of the maxillary invisible appliance (1).
3. The device according to claim 1, characterized in that the palate bar (12) is formed integrally with the maxillary invisible appliance (1) or is a connection part which is detachably connected to the maxillary invisible appliance (1) and is preset.
4. The device according to claim 1, characterized in that the locking element (23) is a ball head and is connected to the end of the limit traction rod (22) by means of a screw, a snap or a magnetic structure.
5. The device according to claim 1, characterized in that the limit traction rod (22) is of a plurality of different length specifications or the length of the limit traction rod (22) is adjustable.
6. A device according to claim 1 or 3, characterized in that the palate bar (12) is an arched rigid or semi-rigid beam structure, the shape of which is adapted to the palate side morphology of the dental arch of the patient.
7. The device according to claim 1, characterized in that the limit traction rod (22) is in a sliding fit with the inner bore of the guide ring (11) such that the limit traction rod (22) can slide axially within the guide ring (11) along it.
8. The device according to claim 1, wherein the base (21) is provided with a mounting groove, the mounting groove is provided with a clamping groove structure with a mouth part smaller than a bottom part, the end part of the limit traction rod (22) is provided with a connector matched with the clamping groove structure, and the connector can be clamped into the clamping groove through elastic deformation and is movably connected in the clamping groove.
9. The device according to claim 1, characterized in that it comprises a plurality of different lengths of the stop drawbar (22), the guide ring (11) and the base (21) being arranged in both the anterior and posterior regions of the maxillary and mandibular appliances, the device being configurable to different mechanical stop conditions by selecting different lengths of stop drawbar (22) and connecting between the guide ring (11) and the base (21) in different positions, the different mechanical stop conditions comprising: a first state, wherein the limit traction rod (22) is used, the length of the limit traction rod is configured to enable the locking piece (23) to be closely attached to the guide ring (11) when the limit traction rod is installed, so that the opening degree is limited to be within about 2 mm; The second state, connect the spacing traction rod (22) between base (21) of the anterior dental region of lower jaw and guide ring (11) of the posterior dental region of upper jaw, form the III kind of traction vector of the backward movement of the lower jaw of guiding, is used for resisting the recurrence trend after the mandibular retroversion; The third state, connect the spacing traction rod (22) between base (21) of the posterior teeth area of lower jaw and guide ring (11) of anterior teeth area of upper jaw, form the II kind of traction vector of the forward motion of the guiding lower jaw, used for stabilizing the bone pieces of forward movement after the anterior operation of lower jaw; In a fourth state, corresponding button-like structures are respectively arranged on the cheek sides of the upper jaw invisible appliance (1) and the lower jaw invisible appliance (2), and are connected through rubber bands to realize elastic traction with more degrees of freedom; the palate bar (12) is selectively arranged according to whether the upper jaw performs a block operation or not, and can be used independently of any one of the first state to the fourth state.
10. A orthognathic postoperative rehabilitation system, comprising: The modular orthognathic postoperative dynamic limit traction device based on an invisible appliance of any one of claims 1-9, and a plurality of different lengths of said limit traction rods (22) for a user to select and install according to the needs to change the limit state of the device; The limiting traction rod (22) with various lengths is any one of a short-specification rigid traction rod for post-operation early-stage near-rigid braking, a medium-length telescopic traction rod for post-operation middle-stage controllable opening training and a semi-rigid elastic traction rod for post-operation later-stage directional traction.

Description

Modular orthognathic postoperative dynamic limiting traction device based on invisible appliance Technical Field The invention relates to the technical field of oral medical appliances, in particular to a rehabilitation device used after orthognathic surgery, and especially relates to a modularized orthognathic surgery dynamic limit traction device based on an invisible appliance and a system thereof. Background Orthognathic surgery is an effective means of correcting severe maxillofacial deformities by osteotomy and moving the jawbone to a desired position to improve the biting function and facial appearance of the patient. Accurate bone block positioning in operation and long-term stable maintenance after operation are key links for determining treatment effect. In the final stage of surgery and in the initial stage of post-operative recovery, a final bite plate (Final Occlusal Splint) is widely used clinically for intermaxillary fixation in order to ensure that the displaced jaw bone pieces heal in a pre-designed position and establish a correct bite relationship. This is currently one of the standard techniques in orthognathic surgery rehabilitation. The prior art scheme is generally that a horseshoe-shaped solid resin plate (which can be made by adopting traditional manual stacking self-setting resin or modern digital 3D printing technology) matched with the arch state of the teeth of a patient is manufactured according to the expected occlusion relation after the operation designed by the virtual operation before the operation. The occlusal surface of the bite plate has imprinting grooves corresponding to the upper and lower dentitions. In clinical use, as shown in fig. 1 (prior art schematic), the practitioner wears the bite plate into the patient's mouth at the end of the procedure so that it is positioned between the upper and lower dentitions. In order to prevent the bone fragments from being displaced by the patient due to unintentional opening movements or muscle pulling and to prevent the bite plate itself from falling off at an early stage after the operation, it is generally necessary to drill holes in a proper position of the bite plate (e.g., cheek flank edges), then pass through the holes using medical stainless steel ligature wires, and tightly ligate and fix both ends of the wire to orthodontic brackets bonded to the teeth of the upper and lower jaws or to a specially implanted interjaw traction pin. By such strong wire ligation, the upper and lower jaws are forcibly locked in a single jaw relationship defined by the bite plate, resulting in a rigid, static "interjaw fixation". In clinical practice, the traction mode between the upper jaw and the lower jaw can be changed according to the different postoperative rehabilitation requirements of patients, namely elastic traction can be realized by hanging rubber bands, opening activities can be allowed in a controllable range, and complete rigid ligation can be realized by hanging steel wires. However, no matter what traction mode is adopted, the occlusal plate body still needs to be rigidly tied on the maxillary teeth or the jawbone through steel wires, so that convenient taking and wearing cannot be realized, and the occlusal plate body is difficult to be compatible with an invisible appliance system. Although the above prior art solutions can provide basic and reliable postoperative initial jaw positioning, the following recognized technical problems to be solved urgently are exposed in long-term clinical practice: 1. the oral cavity health condition is bad, and the infection risk is high, because the steel wire is adopted for non-detachable deadlock type fixation, the patient cannot open the mouth completely within 2 to 4 weeks after operation, and the bite plate cannot be taken out for any effective cleaning. Food residues, saliva and microorganisms are easily accumulated in a narrow gap between the occlusal plate and the gingiva and tooth surface, are difficult to remove, often cause severe gingivitis, mucosal ulcers, secondary bleeding and intractable halitosis, and obviously increase the risk of postoperative wound infection and delayed healing. 2. The function is single, and no active postoperative intervention can be performed, and the occlusal plate and the fixing mode thereof are completely passive retaining devices in nature. It can only maintain the static position of the jawbone set immediately upon surgery. If the patient begins to experience recurrent tendencies of bone block displacement during recovery due to factors such as muscle memory, changes in soft tissue tension, or poor habits (mandibular retraction following mandibular presynamics, or mandibular protrusion following mandibular prestretching), the static device cannot provide any directional, active corrective force to counter or correct such unwanted movements, and there are functional limitations. 3. Patient comfort is poor, postoperative quality of life is seri