CN210541881U

CN210541881U - Composite device for simultaneously realizing three-dimensional movement of orthodontic teeth by front traction of maxilla

Info

Publication number: CN210541881U
Application number: CN201920963394.9U
Authority: CN
Inventors: 熊国平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-05-19
Anticipated expiration: 2029-06-25

Abstract

The utility model discloses a preceding set composite that pulls upper jaw bone and realize just abnormal tooth three-dimensional removal simultaneously, including preceding tractor, the individualized no support groove of series rescues the ware, and with the individualized no support groove of series rescues the ware and the continuous traction elastic ring of preceding tractor, the device is utilizing the individualized no support groove of series to rescue the ware, when the realization carries out three-dimensional just abnormal removal to the tooth in the oral cavity, still provide the holding power for pulling the elastic ring through preceding tractor, make and pull the elastic ring and produce forward elasticity, it conducts maxilla to rescue the ware through the individualized no support groove of series, pull maxilla before reaching, promote the purpose that the patient's upper jaw bone of growth phase is developmental. This kind of device, because of realized promoting the development of patient maxilla in growth development phase and just abnormal tooth three-dimensional direction's removal simultaneously to improve the efficiency of correcting of patient's three kinds of dentognathic face deformity in growth development phase greatly, realized more fast four targets that dentognathic face deformity was corrected: beautiful, functional, healthy and stable occlusion.

Description

Composite device for simultaneously realizing three-dimensional movement of orthodontic teeth by front traction of maxilla

Technical Field

The utility model belongs to the technical research field of orthodontic medical instrument of oral cavity, in particular to front traction upper jaw bone realizes the three-dimensional composite set that removes of just abnormal tooth simultaneously.

Background

Patients with osseous class III dentofacial deformities often present as a depression in the face, mostly due to insufficient development of the upper jaw. Its incidence in caucasians is about 1% to 5%, while in asian populations, it is as high as about 14%. The deformity may further aggravate with the overall growth of the patient in the developmental stage, thereby seriously affecting the appearance and chewing function of the patient and even causing psychological disorder of the patient. Most scholars believe that early intervention is helpful in the prognosis of such patients, suggesting that 8-10 years of age is the golden period for the correction of this type of dysostosis.

Patients with osseous class III dentofacial deformity are often accompanied by the problems of crowding, irregular length, width, height and three-dimensional disorder of upper and lower dentition. The existing orthodontic treatment for patients with bone type III is generally divided into an maxillary anterior traction stage and an upper and lower dentition three-dimensional movement control stage, symptoms of maxillary hypoplasia and upper and lower dentitions three-dimensional disorder are respectively corrected in sequence, the treatment period is long (more than three years), and in the maxillary anterior traction stage (about 12 months), because the upper and lower dentitions cannot be simultaneously three-dimensionally adjusted and moved, the patients are often accompanied with the problems of crowding and misalignment of the upper and lower anterior teeth which affect the appearance, non-occlusion contact of the posterior teeth caused by maxillary anterior traction, dental caries and periodontal disease which are caused by serious crowding and dislocation of the teeth, the aims of correction, function and health of the upper and lower anterior teeth, the maxillary anterior traction and the lower dentition are difficult to realize in a short.

Secondly, after the patient with the bony type III dentogorofacial deformity in the growth and development period adopts the existing traditional anterior traction device to anterior-draw the maxilla, the side effects of mesial movement and extension of the upper molar, lip inclination increase of the upper anterior tooth, obvious back-down rotation of the lower jaw and the like are easily generated, and the subsequent orthodontic treatment becomes complicated.

Furthermore, in the traditional anterior traction maxillary bone orthopedic treatment for bone type III patients, the bonded spiral arch expander is always bonded to two molars and two bicuspids of the upper jaw in the whole anterior traction process (about 1 year), so that the patients have obvious discomfort for a long time, the oral cavity is difficult to clean, and the oral cavity health problems such as swelling of palatal mucosa are easily caused.

Therefore, for a patient with a growth development period with insufficient maxillary development and irregular tooth arrangement, a composite device capable of performing anterior traction on the maxillary bone and realizing three-dimensional movement of orthodontic teeth is needed.

Disclosure of Invention

In order to solve the prior art not enough, the utility model provides a compound device that preceding traction upper jaw bone realized just abnormal tooth three-dimensional removal simultaneously, include preceding tractor, the individualized no support groove of series and rescue the ware and with the individualized no support groove of series and the continuous traction elastic ring of preceding tractor. The device utilizes the contraction elasticity of the traction elastic ring as traction force to front-pull the maxilla of a patient in the growth period so as to promote the development of the maxilla. The series of personalized bracket-free appliances are provided with traction members which are used for fixing traction elastic rings. The series of personalized bracket-free appliances can realize the three-dimensional orthodontic tooth movement of upper and lower teeth.

The device is because of having realized promoting the three-dimensional removal that maxilla develops and just abnormal tooth simultaneously, has improved the efficiency of correcting of III class dentognathic face deformities of patient's osseous growth phase greatly, and more traditional device realizes four targets that dentognathic face deformity was corrected sooner: beautiful, functional, healthy and stable occlusion. Meanwhile, side effects of maxillary molar mesial movement and elongation, lip inclination increase of upper anterior teeth, obvious rear-lower rotation of the lower jaw and the like generated after correction by adopting a traditional device are avoided.

The utility model discloses the technological effect that will reach is realized through following scheme:

a composite device for anterior traction of maxilla and simultaneous realization of orthodontic tooth three-dimensional movement is characterized by comprising a front tractor, a series of personalized bracket-free appliances and a traction elastic ring for connecting the series of personalized bracket-free appliances with the front tractor, wherein the traction elastic ring is used for anterior traction of maxilla and promotion of maxilla development by utilizing the contraction elasticity of the traction elastic ring as traction force; the series of personalized bracket-free appliances are provided with traction members which are connected with the traction elastic ring and used for fixing the traction elastic ring.

Further, the series of personalized bracket-free appliances are provided with fixing parts which are rectangular and provided with openings so that doctors can quickly install the traction hooks, and the traction members are further designed in a way that the fixing parts and the series of personalized bracket-free appliances are integrally formed.

Furthermore, the traction component is a traction hook, the traction hook comprises a fixed rod and a connecting part, the fixed rod is arranged in the fixed part of the series of personalized bracket-free orthodontic devices, and the connecting part is arranged at the top end of the fixed rod and is of a question mark hook structure with a concave surface facing the inner side of the oral cavity.

Further, the length of the towing hook is not less than 4 mm.

Further, the front tractor comprises a head fixing assembly, a chin (chin) fixing assembly, a traction column assembly and a connecting rod assembly, wherein the head fixing assembly, the chin (chin) fixing assembly and the traction column assembly are connected into a whole through the connecting rod assembly;

the connecting rod assembly comprises a head connecting rod connected with the head fixing assembly, a chin connecting rod connected with the chin fixing assembly, and a position adjusting block for connecting the head connecting rod and the chin connecting rod into a whole; the head fixing component comprises a forehead support (forehead positioning block) and a connecting band, and two side ends of the forehead support (forehead positioning block) are provided with forehead support connecting blocks; the chin (chin) fixing component comprises a chin pocket structure matched with the chin in shape and a chin (chin) connecting block fixedly arranged at the bottom of the chin pocket structure; the traction column assembly comprises a traction connecting rod, a traction block movably sleeved on the traction connecting rod and a traction column in threaded connection with the traction block;

the head connecting rod is of a question mark hook structure and comprises a first connecting rod and a second connecting rod, the tops of the first connecting rod and the second connecting rod are respectively connected with a forehead support (a forehead positioning block), and the bottoms of the first connecting rod and the second connecting rod are connected with a position adjusting block; the chin (chin) connecting rod is of a U-shaped structure, two ends of the top of the chin (chin) connecting rod are respectively connected with the position adjusting block, and the bottom of the chin (chin) connecting rod is connected with the chin pocket structure; the traction connecting rod is of a U-shaped structure, two ends of the traction connecting rod are respectively connected with the position adjusting block, and the bottom of the U-shaped structure is movably connected with the traction block; the two ends of the connecting band are respectively clamped between the tops of the first connecting rod and the second connecting rod and the forehead support (forehead positioning block) to form a complete ring matched with the head.

Furthermore, the connecting band is an elastic connecting band with an adjusting buckle.

Furthermore, the forehead support connecting block, the chin (chin) connecting block and the position adjusting block are respectively provided with a positioning screw, and the positioning screws respectively correspond to the head connecting rod, the chin (chin) connecting rod and the traction connecting rod.

Furthermore, the tail ends of the head connecting rod, the chin (chin) connecting rod and the traction connecting rod are respectively provided with a limiting sleeve.

Further, the traction elastic ring is generally two on each side of the left and right sides, one end of the elastic ring is connected to the traction member of the series of individual bracket-free appliances, the other end is connected to the traction column of the front tractor, and each side of the left and right sides generates 500-1000 g traction force.

The utility model has the advantages of it is following:

1. the utility model discloses preceding draw the composite set that the patient's maxilla in growth and development period realized just abnormal three-dimensional removal of tooth simultaneously, its individualized no support groove of series rescues the ware and realizes removing the three-dimensional just abnormal tooth of upper and lower dentition, utilizes preceding tractor to provide the support for drawing the elastic ring simultaneously, makes the elastic action who draws the elastic ring, and the component of drawing of correcting the ware through the individualized no support groove of series conducts maxilla, draws the maxilla forward, promotes the development of maxilla. The device has avoided traditional device to pull stage (about 12 months) before the maxilla, because of can't carry out three-dimensional removal to upper and lower dentition simultaneously and a series of problems that appear, crowding the disorder of upper and lower anterior teeth that the patient often accompanies, the back tooth is because of the no interlock contact that the maxilla pulls the production, the caries that seriously crowds dislocation tooth appears and periodontal disease etc. seriously influence the patient beautifully, the function, healthy problem to realize more fast (the course of treatment shortens 12 months than traditional device about) four targets that the dentognathic-facial deformity was rescued: beautiful, functional, healthy and stable occlusion.

2. The utility model discloses preceding composite set that pulls growth and development phase patient's maxilla to realize just abnormal tooth three-dimensional removal simultaneously, its operation degree of difficulty is low, and can be by oneself by the patient to preceding tractor and the ware is rescued to no bracket of series and wear and change, save the trouble of wearing and changing at every turn and all needing the double-diagnosis, and, the device need the wearing time of the spiral expander that longer time (about 1 year) was worn in with the traditional preceding tractor device mesooral cavity, shorten to about 3 months, thereby more do benefit to the healthy maintenance in patient's oral cavity.

Drawings

FIG. 1 is a schematic view of the composite device of the present invention;

FIG. 2 is a schematic structural view of the individual bracket-free appliance of the present invention;

fig. 3 is a schematic structural view of the front tractor of the present invention.

Description of the symbols of the drawings: 1. a front tractor; 11. a head fixation assembly; 111. a connecting belt; 1111. adjusting buckles; 112. forehead rest (forehead positioning block); 1121. a forehead support connecting block; 12. chin (chin) fixation assembly; 121. a chin cup structure; 122. chin (chin) connecting block; 13. a traction column assembly; 131. a traction connecting rod; 132. a traction block; 133. a traction column; 14. a connecting rod assembly; 141. a head connecting rod; 1411. a first connecting rod; 1412. a second connecting rod; 142. chin (chin) connecting rods; 143. a position adjusting block; 15. a limiting sleeve; 16. a set screw; 2. a personalized bracket-free appliance; 21. a fixed part; 22. a traction member; 221. fixing the rod; 222. a connecting portion; 3. a traction elastic ring;

Detailed Description

In order to better understand the present invention, the structure and advantages of the present invention are more prominent, and the present invention is described in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the composite device for anterior traction of maxilla and simultaneous realization of orthodontic tooth three-dimensional movement in this embodiment includes an anterior retractor 1, a series of personalized bracket-free appliances 2, and a traction elastic ring 3 connecting traction members of the series of personalized bracket-free appliances with the anterior retractor, and the contraction elasticity of the traction elastic ring 03 is used as an anterior traction force for traction of the entire personalized bracket-free appliance 2. The series of individual bracket-free appliances are provided with a traction member 22, and the traction member 22 is connected with a traction elastic ring and used for fixing the traction elastic ring 3. When the series of personalized bracket-free appliances realize three-dimensional movement of upper and lower teeth in the oral cavity, the front retractor is used for providing support for the traction elastic ring, so that the elasticity of the traction elastic ring acts on the series of personalized bracket-free appliances, and then the upper jaw is pulled forwards and the development of the upper jaw is promoted, namely, the three-dimensional movement of the upper and lower teeth is realized while the front traction is realized on the upper jaw, thereby shortening the dentognathic face deformity correction period of a patient; furthermore, the side effects of mesial movement and elongation of the upper molar, increased lip inclination of the upper anterior teeth, and significant posterior-inferior rotation of the lower jaw, which are caused by the use of the existing anterior traction device, can be avoided.

The individual bracket-free appliance is a series of individual bracket-free appliances, as shown in figure 2, namely, after a clinician determines a correction scheme of dentognathic facial deformity, a series of (dozens of pairs of) appliances for moving orthodontic teeth of a patient from an original position to a set ideal position are produced with the help of computer aided design software, so that three-dimensional movement of upper and lower teeth is realized, and an orthodontic treatment target is completed. In this embodiment, the series of personalized bracket-free appliances are provided with a fixing portion 21, which is rectangular and provided with an opening for installing a traction member 22, and the fixing portion and the series of personalized bracket-free appliances are integrally formed. The traction component is a traction hook, as shown in fig. 2 and 3, the traction hook comprises a fixed rod 221 and a connecting part 222, the fixed rod is arranged in a fixed part of the series of personalized bracket-free orthodontic devices, the fixed rod is bonded and fixed on the tooth surface by light-cured resin through a fixed part template on the series of bracket-free orthodontic devices, after the series of upper jaw personalized bracket-free orthodontic devices are in place, the traction effect of a traction elastic ring with one end hung on a front tractor on the traction hook applies force to the upper jaw, and the upper jaw is subjected to front traction to promote the forward development of the upper jaw. The connecting part is arranged at the top end of the fixed rod and is close to the tooth resistance center, so that the forward traction efficiency of the front traction device for drawing the maxilla forwards is improved; the series bracket-free appliance and the fixed part of the traction hook are integrally formed, and a doctor can quickly manufacture the traction hook adhered to the tooth by utilizing the fixed part template on the series bracket-free appliance; the traction hook is a question mark hook structure with a concave surface facing the inner side of the oral cavity, is favorable for fixing the traction elastic ring, and the other end of the traction elastic ring stretches outwards the oral cavity and is connected with the traction column of the front tractor. In order to ensure that the elastic traction ring at the end of the traction hook is not easy to slip, the length of the traction hook is preferably not less than 4 mm. The number of the traction elastic rings on each side of the left and the right is generally 2, and the traction elastic rings generate 500-1000 grams of traction force on each side to pull the maxilla forwards.

In addition, the design of the traction member is not limited to the structure in the embodiment, and an arc-shaped incision with an opening facing the inside of the oral cavity can be directly and precisely cut on the personalized bracket-free appliance, then the traction elastic ring is connected with the arc-shaped incision, and the other end of the traction elastic ring is also hung on a traction column of a front tractor, so that the upper maxillary bone is subjected to front traction, and meanwhile, the upper and lower teeth are moved three-dimensionally by using a series of bracket-free appliances, and the correction target is achieved.

As shown in fig. 3, the front tractor comprises a head fixing component 11, a chin fixing component 12, a traction column component 13 and a connecting rod component 14, wherein the head fixing component, the chin fixing component and the traction column component are connected into a whole through the connecting rod component.

The connecting rod assembly comprises a head connecting rod 141 connected with the head fixing assembly, a chin connecting rod 142 connected with the chin fixing assembly, and a position adjusting block 143 for connecting the head connecting rod and the chin connecting rod into a whole; the head connecting rod is of a question mark hook structure and comprises a first connecting rod 1411 and a second connecting rod 1412, the tops of the first connecting rod and the second connecting rod are respectively connected with a forehead support (forehead positioning block), and the bottoms of the first connecting rod and the second connecting rod are connected with a position adjusting block; the chin (chin) connecting rod is of a U-shaped structure, two ends of the top of the chin (chin) connecting rod are respectively connected with the position adjusting block, and the bottom of the chin (chin) connecting rod is connected with the chin pocket structure.

The head fixing component comprises a forehead support (forehead positioning block) 112 and a connecting band 111, and forehead support connecting blocks 1121 are fixedly arranged at two side ends of the forehead support (forehead positioning block); the connecting band both ends joint respectively in the head of head and second connecting rod top and forehead hold in the palm (forehead locating piece) between, form complete, with the circle of head looks adaptation, forehead holds in the palm (forehead locating piece) and locates the forehead overhead, the connecting band both ends joint is in the head of head and second connecting rod top and forehead hold in the palm (forehead locating piece) between the back, twine behind patient's brain, can accomplish the fixed of connecting band and install. The connecting band is the elastic connecting band that has regulation button 1111, can carry out the adjustment of adaptability according to the size of patient's head, satisfies different patients' demand. The chin (chin) fixing component comprises a chin pocket structure 121 matched with the chin in shape and a chin (chin) connecting block 122 fixedly arranged at the bottom of the chin pocket, the chin pocket structure is placed on the chin of a patient and is of a structure with an outer contour arc line similar to that of the chin, and the patient can be free of discomfort when the patient wears the front retractor.

Because the head structure of each person is different, the distance from the chin to the neck and the shape of the maxilla can be different from person to person, when the patient wears the front tractor, the head connecting rod 141, the chin connecting rod 142 and the traction connecting rod 131 can be adjusted according to the requirements of the patient, thereby achieving the purpose of adjusting the positions of the chin fixing component 12 and the traction column component 13. In order to adjust the position of the chin (chin) fixing component 12 and the traction column component 13, the connecting rod component 14 is connected with the head fixing component 11 and the chin (chin) fixing component 12, and the connecting rod component 14 is connected with the traction column component 13 and is not easy to slide, so that the position of the chin (chin) fixing component and the traction column component is ensured, the forehead support connecting block, the chin (chin) connecting block and the position adjusting block are respectively provided with a positioning screw 16, and the positioning screws respectively correspond to the head connecting rod, the chin (chin) connecting rod and the traction connecting rod. In addition, head connecting rod, chin (chin) connecting rod and pull the connecting rod end and all be equipped with the stop collar, can not only prevent that head connecting rod, chin (chin) connecting rod and pull the connecting rod pine and take off, guarantee the stability of chin (chin) fixed subassembly and traction column subassembly position, but also can prevent head connecting rod, chin (chin) connecting rod and pull the terminal sharp-pointed part scratch patient of connecting rod, guaranteed the security that the patient used.

The traction column component comprises a traction connecting rod 131, a traction block 132 movably sleeved on the traction connecting rod and a traction column 133 in threaded connection with the traction block, the traction connecting rod is of a U-shaped structure, two ends of the traction connecting rod are respectively connected with a position adjusting block, the bottom of the U-shaped structure is movably connected with the traction block and arranged at the upper end of the chin fixing component, and is connected with a series of personalized bracket-free appliance traction components through a traction elastic ring to provide a force for traction to the front end of the oral cavity, so that the maxilla of a patient in a growing period is subjected to front traction, and the aim of promoting the development of the maxilla is fulfilled; the number of the traction columns is 2, and the traction columns are connected with traction hook openings on the series of personalized bracket-free appliances or traction members of the series of personalized bracket-free appliances bonded on teeth through traction elastic rings. The left and right sides of the traction elastic ring 3 are provided with a plurality of traction elastic rings, one end of each traction elastic ring is connected with a traction hook opening on a series of personalized bracket-free appliances or traction members of the series of personalized bracket-free appliances stuck on teeth, the other end of each traction elastic ring is connected with a traction column of a front tractor, the diameter of each traction elastic ring is preferably 3/16 inch-1/4 inch, and 500-1000 g of traction force is generated. The left side and the right side of the traction elastic ring can be placed in a crossed mode to prevent hurting the lower lip and improve the comfort degree of the tractor before a patient wears the tractor.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite device for anterior traction of maxilla and simultaneous realization of orthodontic tooth three-dimensional movement is characterized by comprising a front tractor, a series of personalized bracket-free appliances and a traction elastic ring for connecting the series of personalized bracket-free appliances with the front tractor, wherein the contraction elasticity of the traction elastic ring is used as traction force and acts on the maxilla of a patient in a growth and development period, so that the aims of anterior traction of the maxilla and promotion of the development of the maxilla are fulfilled; the series of personalized bracket-free appliances are provided with a traction member which is connected with the traction elastic ring.

2. The composite device for anterior distraction of the maxilla while achieving three-dimensional movement of orthodontic teeth according to claim 1, wherein the series of individual bracket-less appliances are provided with fixing portions having a rectangular shape and fixing holes for mounting the distraction member.

3. The composite device for anterior distraction of the maxilla while achieving three-dimensional movement of orthodontic teeth of claim 2, wherein the anchor is integrally formed with the personalized bracket-less appliance.

4. The composite device for anterior distraction of the maxilla and simultaneous three-dimensional movement of orthodontic teeth according to claim 2, wherein the distraction means is a distraction hook comprising a fixation rod and a connection portion, and the fixation rod is mounted in the fixation portion of the series of personalized bracket-free appliances, and the connection portion is provided at the top end of the fixation rod and has a hook structure with a concave surface facing the inside of the oral cavity.

5. A compound device for anterior distraction of the maxilla while achieving three-dimensional movement of orthodontic teeth according to claim 4, wherein the length of the distraction hooks is not less than 4 mm.

6. The composite device for anterior traction of maxilla while achieving three-dimensional movement of orthodontic teeth according to claim 1, wherein the anterior tractor comprises a head fixing assembly, a chin fixing assembly, a traction column assembly and a connecting rod assembly, the head fixing assembly, the chin fixing assembly and the traction column assembly being integrally connected by the connecting rod assembly;

the connecting rod assembly comprises a head connecting rod connected with the head fixing assembly, a chin connecting rod connected with the chin fixing assembly, and a position adjusting block for connecting the head connecting rod and the chin connecting rod into a whole; the head fixing assembly comprises a forehead support and a connecting band, and forehead support connecting blocks are arranged at two side ends of the forehead support; the chin fixing component comprises a chin pocket structure matched with the chin in shape and a chin connecting block fixedly arranged at the bottom of the chin pocket structure; the traction column assembly comprises a traction connecting rod, a traction block movably sleeved on the traction connecting rod and a traction column in threaded connection with the traction block;

the head connecting rod is of a question mark hook structure and comprises a first connecting rod and a second connecting rod, the tops of the first connecting rod and the second connecting rod are respectively connected with the forehead support, and the bottoms of the first connecting rod and the second connecting rod are connected with a position adjusting block; the chin connecting rod is of a U-shaped structure, two ends of the top of the chin connecting rod are respectively connected with the position adjusting block, and the bottom of the chin connecting rod is connected with the chin pocket structure; the traction connecting rod is of a U-shaped structure, two ends of the traction connecting rod are respectively connected with the position adjusting block, and the bottom of the U-shaped structure is movably connected with the traction block;

the two ends of the connecting band are respectively clamped between the tops of the first connecting rod and the second connecting rod and the forehead support to form a complete ring matched with the head.

7. The composite device for anterior distraction of the maxilla and simultaneous achievement of three-dimensional orthodontic tooth movement according to claim 6, wherein the connecting band is an elastic connecting band with adjustment buckles.

8. The composite device for anterior traction of maxilla and simultaneous realization of orthodontic tooth three-dimensional movement according to claim 6, wherein the forehead support connection block, the chin connection block and the position adjustment block are provided with positioning screws corresponding to the head connection bar, the chin connection bar and the traction connection bar, respectively.

9. The composite device for anterior distraction of the maxilla and simultaneous achievement of three-dimensional orthodontic tooth movement according to claim 6, wherein the head connecting rod, the chin connecting rod and the distraction connecting rod are provided at their distal ends with stop collars.

10. The composite device for anterior distraction of the maxilla and simultaneous achievement of three-dimensional orthodontic tooth movement of claim 1, wherein said elastic traction rings are 2 on each side and are connected at one end to the traction members of a series of personalized bracket-less appliances and at the other end to the traction posts of the anterior distractor, each side generating 500-1000 grams of traction force.