CN113116566A - Traction device for embedded tooth - Google Patents

Abstract

The invention relates to the field of orthodontic tools, in particular to an embedded tooth traction device. The device consists of a traction hook and an orthopedic appliance, wherein the traction hook is adhered to the dental crown of the embedded tooth to be pulled, the traction hook consists of an adhesive attachment and a ligature wire, one end of the ligature wire is fastened on the adhesive attachment, and the other end of the ligature wire is free and bent into a hook. The appliance is composed of an elastic traction wire and a fixing device, wherein one end of the elastic traction wire is embedded in the fixing device, and the other end of the elastic traction wire is bent and connected with the free bent end of the ligature wire on the traction hook. The device can reasonably adjust the traction direction of the embedded tooth in a three-dimensional space, can correct the embedded tooth in different dentition periods, has lower requirements on anchorage teeth, and is simple to manufacture, low in price and remarkable in effect.

Description

Traction device for embedded tooth

Technical Field

The invention relates to the field of orthodontic correction tools, in particular to an embedded tooth traction device, which is also suitable for correcting severely malposed teeth.

Background

An embedded tooth generally refers to a tooth which has passed the eruption stage, but is still embedded in the jaw bone tissue and cannot erupt due to the obstruction of adjacent teeth, bone tissue or soft tissue, and cannot be directly observed in the mouth through naked eyes, and can be discovered through the imaging examination. The prevalence rate of the buried teeth is 13.7-16.5% in foreign research, 7.33-9.61% in domestic big data case statistics, and is a common frequently encountered disease in oral clinic. The embedded tooth has complicated pathogenesis, common pathological factors include abnormal eruption of inherited permanent teeth caused by abnormal position of tooth embryos, early loss of deciduous teeth, infection of the deciduous teeth, trauma and the like, and systemic factors such as malnutrition, rickets, sclerosteosis, endocrine disturbance and the like.

An embedded tooth can cause various hazards to oral health. The buried teeth and the inflammation and the tumor of the oral cavity and the maxillofacial area induced by the buried teeth are the most common diseases in the oral cavity and the maxillofacial surgery. The embedded tooth can cause normal tooth space widening, tooth torsion, ectopic deformity and other deformities, easily cause dental caries and periodontitis, and possibly induce jaw bone tumor. The buried teeth may produce a compression symptom to adjacent teeth, such as the second molar being compressed by the buried third molar, root resorption occurring, causing pain and secondary pulpitis and periapical periodontitis. The occurrence of the buried teeth not only causes the reduction of the number of permanent teeth, but also causes abnormal dentition, abnormal arch morphology, disordered occlusion relation, inflammation of adjacent tissues and root absorption, and influences the beauty of the face and the chewing function and the psychological health of patients.

At present, the treatment of the embedded tooth has two options: firstly, the implant is removed by a surgical method, but the risk of directly removing the embedded tooth which is closely related to important tissue structures such as lower alveolar neurovascular bundles, maxillary sinus cavities, nasopalatine nerves and the like is high. In addition, the incomplete dentition caused by the removal of the embedded teeth sometimes affects the beauty, occlusion relation and chewing function of patients. Another option is to pull the embedded tooth into the oral cavity by traction, and then carry out conventional orthodontic treatment to correct the embedded tooth to the normal position. Even if the tooth needs to be pulled out after traction, because the embedded tooth leaves the tissues such as important nerve vessels, the risk and difficulty in the tooth extraction operation can be reduced, and the safety is greatly increased.

With surgical exposure, combined orthodontic distraction is one of the best treatments. The conventional correction steps are carried out in four steps, namely 1) expanding the eruption gap to ensure that the eruption channel of the buried tooth is smooth. 2) Performing surgical window opening to expose the embedded dental crown; 3) sticking traction accessories such as a bracket, a lingual button, a traction hook and the like; 4) the orthodontics applies traction force to pull the embedded teeth to sprout and align the teeth. The traction type embedded tooth has the longest treatment course and the largest difficulty, and is also the key point of the clinical research of the existing embedded tooth.

A common method of traction of an embedded tooth is to use a movable or fixed appliance to traction the embedded tooth. If a fixed appliance is used, it is desirable that the remaining teeth in the dentition undergo a fixed appliance. The dentition is initially aligned to stabilize the anchorage using a large arch wire. The traction of the buried teeth needs to be pushed back for several months. During this time, the position and morphology of the embedded teeth of the pediatric patient may change. If a plurality of continuous teeth are embedded, the free distance of the main arch wire is increased, so that the elasticity of the arch wire is increased, the force required for drawing the embedded teeth is increased, the trend is aggravated, and the inclination of the adjacent teeth serving as anchorage is easily caused. If the opposite jaw teeth are dragged, the opposite jaw teeth are easily stretched. The fixed appliance generally aligns the embedded teeth directly in the dentition, and the traction direction is single; furthermore, fixed appliances are limited in use in mixed dentition children with multiple deciduous teeth that may loosen. Moreover, the fixed appliance increases the difficulty of cleaning the oral cavity, which is easy to cause caries; in addition, the bracket falls off, the arch wire stimulates soft tissues and other emergencies, the requirement on the compliance of patients is higher, and the device is more difficult for children patients. Although the movable appliance has large volume and poor taste and influences pronunciation, the traction can be started immediately, and the hard palate and the alveolar bone can obtain more sufficient anchorage, so that the movable appliance can be used even if insufficient healthy teeth are not used for supporting in dentition; but also can be taken off to brush teeth and gargle, which is beneficial to keeping the oral hygiene and preventing dental caries and oral soft tissue inflammation. Therefore, the movable appliance is suitable for low-age children patients with poor tooth brushing effect and mixed dentition period, and can be used for early correction of the embedded teeth and reducing the damage of the embedded teeth.

The traction buried teeth need to have enough tissue to resist the counterforce of traction force and ensure the magnitude of the traction force, and the traction force direction also needs to be adjusted to control the eruption path of the buried teeth, so that the buried teeth can avoid the obstruction and move to the correct position.

In the conventional traction correction, the traction correction force is mainly derived from the restoring force generated by the deformation of an arch wire or an elastic ring. When the fixed orthodontic device is used, the embedded tooth is continuously tied with the arch wire, and the orthodontic force is generated by restoring force generated by deformation of the arch wire; the movable appliance mostly adopts a rubber ring to connect the embedded tooth with the appliance drag hook, and the embedded tooth is pulled by the elasticity of the rubber ring. The distance between the position (traction point) connected with the embedded tooth on the correcting device and the embedded tooth influences the correcting force, the distance is large, the shape of the arch wire or the rubber ring is enlarged, and the correcting force is large. Both archwires and rubber bands require sufficient distance between the embedded teeth and the distraction site. If there is insufficient space in the patient's mouth to allow the appliance to pull the hook away from the embedded tooth, the archwire or rubber band becomes less deformed and the appliance force is less. On the other hand, the direction of the correcting force is determined by the position of the traction point of the correcting device, and the embedded tooth is erupted towards the traction point after being pulled. In some cases, the traction point with the proper direction is difficult to consider the size of the correction force, if the embedded tooth needs to move towards the labial and buccal sides, the traction point is best on the labial side, but because the space between the gingiva and the soft tissues of the labial and buccal sides is narrow, the distance between the traction point and the embedded tooth is difficult to increase, and therefore, the three-dimensional traction of the embedded impacted tooth is always a clinical difficulty at present.

Aiming at the problem, the invention designs the appliance which has low requirement on anchorage teeth, can be used for different dentition periods, has flexible and changeable traction force and direction, is simple to manufacture, is convenient for a patient to wear and apply force, and is safe and efficient.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the traction device for the embedded tooth, which can adjust the traction direction in a three-dimensional space, can be used for different dentition periods and has low requirement on the anchorage tooth.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the device consists of a traction hook and an appliance, wherein the traction hook is adhered to the dental crown of the embedded tooth to be pulled, the traction hook consists of an adhesive attachment and a ligature wire, one end of the ligature wire is fastened on the adhesive attachment, the other end of the ligature wire is free and bent into a hook, the appliance consists of an elastic traction wire and a fixing device, one end of the elastic traction wire is embedded in the fixing device, the tail end of the elastic traction wire is bent, and the tail end of the elastic traction wire is bent to be beneficial to stabilization; the other end of the elastic traction wire can be bent or not and is detachably connected with the bent hook at the other end of the ligature wire on the traction hook. The ligature wire is used for penetrating through gingival tissues and connecting the adhesive attachment and the elastic traction wire. Along with the eruption of the embedded teeth, the length can be cut short as required.

Furthermore, the elastic traction wire can also be combined with an invisible appliance, and the invisible appliance is used as a retention device. That is to say the retention means can be replaced by invisible appliances.

Furthermore, the elastic traction wire is bent into a ring at the position extending out of the retention device, the number of the rings is 1-2 to adjust the required elasticity, and the number of the rings is determined according to the required traction force and the softness degree. The number of the elastic traction wires which are bent back to form a ring at the position where the fixing device is extended is determined according to the elastic force required by traction of the embedded teeth, and one elastic traction wire is generally used. One end of the ring extends outwards to form a traction section, and the length and the angle direction of the traction section can be adjusted according to the direction required by the embedded tooth, so that the requirement is met.

Furthermore, the elastic traction wire is made of an Australian wire, an orthodontic stainless steel arch wire or a nickel titanium wire.

Preferably, the elastic traction wire is an Australian wire. Australian wire is between stainless steel and nickel titanium wire in its elasticity and hardness. The wire has lower hardness and better elasticity than a stainless steel arch wire, but has higher hardness and better toughness than a nickel-titanium wire. A section of free Australian wire not only has enough hardness and no deformation, but also can be bent to form a spring curve, so that the elasticity is increased, the movement direction of teeth can be well controlled, and the elasticity can be adjusted. Therefore, Australian silks are the best choice for the device.

Furthermore, the structure of the retention device mainly depends on the direction of the traction force required for traction of the embedded tooth and the height and integrity of the crowns of the teeth except the embedded tooth in the dentition where the embedded tooth is positioned. The basic principle of the design of the retention device at least meets the three-point balance of the retention device, wherein the elastic traction wire is connected with the traction hook to form a fixed point, and the other two fixed points are positioned in different quadrants of the same dental arch, so that the sufficient retention force is ensured, and meanwhile, the beauty and the comfort are considered.

Further, if the direction of the traction force is towards the palate side or the jaw side, when the dentition is in an early stage of mixed dentition or the damage to the tooth body is serious, the retention device can adopt a full-wrapping type jaw pad, so that the contact area of the appliance and the oral tissue is increased, and the retention force is increased. One end of the elastic traction wire is embedded at the lingual side position in the fully-wrapped jaw pad close to the position of the embedded tooth; when the dentition is in the permanent dentition period or in the later period of the mixed dentition and the tooth body is healthy and complete, the retention device is composed of a base and 2-3 single-arm clamps, the single-arm clamps are used for fixing the base, and one end of the elastic traction wire is embedded in the position of the tongue side in the base close to the position of the embedded tooth.

Further, if the direction of the traction force is toward the palatal side or the jaw side, the retention device may employ a Nance button.

Further, the single-arm card can be replaced by an arrow card, and a double-curved lip bow can be added according to needs.

Further, when the direction of the traction force is deviated to the labial side, when the dentition is in the early stage of mixed dentition or the damage to the tooth body is serious, the fixing device can adopt a full-wrapping jaw pad, and one end of the elastic traction wire is embedded in the labial side part of the full-wrapping jaw pad; when the dentition is in the permanent dentition period or the mixed dentition later period and the tooth body is healthy and complete, the retention device comprises a base support and 2 or more than 2 single-arm cards and a hyperbolic labial arch, one end of the elastic traction wire is bonded on a beam of the hyperbolic labial arch to a curve by self-setting plastics, and the position of the hyperbolic labial arch does not shield the buried teeth to be corrected. This is because: when the height of the crown of the rest teeth in the dentition is insufficient, for example, the mixed dentition is early, the primary teeth in the dentition are provided with primary teeth, the permanent teeth are not sufficiently erupted, or the damage to the tooth body is serious, for example, a plurality of teeth have serious diseases, so that the retention of the appliance is difficult. In such cases, the use of a fully wrapped jaw pad as a retention device may increase retention. Have a plurality of permanent teeth erupted in the dentition, and the tooth body is healthy complete, like permanent dentition period or mixed dentition later stage, the maintenance device constitute by base support plus 2 or more than single armed card and hyperbolic lip arch, elastic traction silk with from congealing plastics bond and make on the song of hyperbolic lip arch and form, the position of hyperbolic lip arch not shelter from the buried tooth that will correct.

For patients with early mixed dentition or serious tooth injury, the fully-wrapped jaw pad is used, the whole dentition except for the embedded teeth is used as the anchorage teeth, the anchorage force is effectively dispersed, and the phenomena that the adjacent teeth of the embedded teeth are too stressed to move or skew are avoided; furthermore, if a retention device consisting of a base plus 2 or more than 2 single-armed clips and a hyperbolic labial arch is used in the early stage of mixed dentition, the single-armed clips may not be placed because the molars are not yet fully erupted. Therefore, in the early stage of mixed dentition or when the damage to the tooth body is serious, the full-wrapping jaw pad is preferably used. While the permanent dentition stage and the mixed dentition later stage may have an effect on the joint if a full-wrap jaw pad is used. Furthermore, there are already enough healthy teeth to provide retention, and a one-armed snap-on-base device can be used for retention.

Furthermore, the adhesive accessories mostly use tongue side buckles and brackets.

The traction hook is adhered, firstly, the mucous membrane of the embedded tooth is cut, part of alveolar bone is removed, part of the dental crown of the embedded tooth is exposed, an adhesive accessory (a lingual button or a bracket) is adhered to the dental crown of the embedded tooth, then a ligature wire is fastened on the adhesive accessory, and the other end of the ligature wire is bent; the mucosa is sutured and the free ends of the ligature wire are extended into the mouth.

The fully-wrapped jaw pad is adopted, one end of the elastic traction wire is embedded in the fully-wrapped jaw pad, and the whole dentition, alveolar bones and mucous membranes can be used as anchorage tissues to bear the reaction force of traction force; if the patient is in the permanent dentition stage, a double-curved labial arch is arranged at the position avoiding the embedded teeth, and one end of the elastic traction wire is bonded on the double-curved labial arch by self-setting plastics. The elastic traction wire is bent back to form a ring at the position exposed out of the retention device, and the extended free arch wire is connected with the traction hook of the embedded tooth.

When in use, the traction hook is installed and then the appliance is worn. Different appliance devices are selected according to different traction directions of the embedded teeth. When the embedded tooth needs to be pulled, the bent end of the ligature wire on the pulling hook is connected to the pulling tail end of the elastic pulling wire on the appliance. If not, the curved end of the ligature wire on the towing hook is separated from the towing tail end of the elastic towing wire on the appliance, as shown in phantom. After the traction hook is connected with the elastic traction wire, the elastic traction wire deforms and generates restoring force at the same time, and the traction hook forms pulling force to the traction hook, so that the embedded tooth is subjected to traction force towards different directions of a palate side, a lip side and a jaw side, and the embedded tooth is slowly pulled towards a required direction, and the purpose of traction of the embedded tooth is achieved; the elastic traction wire is bent back to form a ring at the position extending out of the retention device, and the trend and the position of the traction wire can be adjusted in the three-dimensional direction at the position, so that a proper traction point is obtained.

The key characteristic of this patent design is that the orthodontic arch wire is placed on the movable appliance, and the elasticity of the orthodontic arch wire is used to pull the buried teeth. The special traction hook is not needed, the distance between the traction hook and the embedded tooth does not need to be considered, the influence of the position of the traction hook on the traction force does not need to be considered, and the soft tissue stimulation is small. The rubber band does not need to be used or replaced, and the operation of the patient is simple. The fixed orthodontic arch wire (such as Australian wire, nickel titanium wire, stainless steel wire and the like) used by the appliance has the characteristics of large elasticity, small diameter and soft and durable strength, and moreover, the fixed orthodontic arch wire has various elastic changes according to different types and specifications of the arch wire and can meet the requirements of different force values. In addition, the archwire is easily plastic (Australian wire, stainless steel wire) and can be bent to different shapes and lengths as required. The orthodontic arch wire can be used for manufacturing a traction wire or a hook, has elasticity and is easy to deform after being stressed. Even if the distance from the embedded tooth is long, the tooth can be hung. The elastic traction wire is connected to the embedded tooth, the distance from the embedded tooth is reduced, and even the elastic traction wire can cling to the mucous membrane. The stimulation of the oral tissue is minimal. In addition, once the elastic traction wire is connected to the embedded tooth, the elastic traction wire has the tendency of returning to the original shape after being deformed, and the generated restoring force acts on the embedded tooth, namely the traction force for drawing the embedded tooth. The restoring force direction is the direction of the traction force of the buried tooth, and the buried tooth can be pulled towards the jaw direction, the labial palatal side or even the gum direction in the three-dimensional direction.

Compared with the prior art, the invention has the following beneficial effects:

1) the invention creatively changes the innovative idea, places the orthodontic arch wire on the movable appliance, and utilizes the elasticity of the orthodontic arch wire to draw the buried teeth. The special traction hook is not needed, the distance between the traction hook and the embedded tooth does not need to be considered, the influence of the position of the traction hook on the traction force does not need to be considered, and the soft tissue stimulation is small. The rubber band does not need to be used or replaced, and the operation of the patient is simple. The device solves the defects that the rubber band is used as an elastic traction material in the prior art, and the rubber band cannot apply force if the distance between an embedded tooth and an anchorage tooth is small; even if the rubber band can be used, the rubber band needs to be replaced frequently; and the problem that the traction hook is difficult to place due to the fact that the distance between the embedded tooth and the surrounding tissues is too close is also solved.

2) The invention designs the traction device according to the direction of traction force needed by traction of the buried teeth, can provide multidirectional traction force for the palate side, the lip side, the jaw side and the like, and realizes the problem of controlling the three-dimensional traction direction of the buried teeth at different positions.

3) The invention realizes the intermittent traction of the embedded tooth through the detachable connection of the ligature wire and the elastic traction wire on the traction hook, so that a patient can take and wear the appliance by himself, the oral hygiene is facilitated, the appliance is convenient to clean, and the safety is increased.

4) The invention adopts different retention devices for different dentition periods, effectively solves the problem of insufficient anchorage and simultaneously gives consideration to the comfort.

5) The device skillfully utilizes the characteristics that the lengths and the curvatures of the elastic traction wire and the ligature wire can be adjusted according to requirements. When the embedded tooth part is pulled out, and the traction ligature wire is too long to extend out of the gum, the ligature wire can be cut short to be bent again, so that the stimulation to oral tissues is avoided while the traction force is increased. In the traction process of the embedded tooth, the traction angle is adjusted according to the requirement, so that the subsequent adjustment and treatment for multiple times are facilitated, and the success rate and the efficiency of the traction of the embedded tooth are increased.

6) The device is suitable for traction and correction of the embedded teeth in different dentition stages and different positions. Aiming at patients with mixed dentition stage, with missing or non-eruption posterior teeth, the full-wrapped jaw pad can provide sufficient anchorage. The device has low anchorage requirement and wider application range, can be used for early correction of the embedded tooth of the child, is more beneficial to the growth of the tooth root of the embedded tooth, and reduces the tooth root deformity. In cases where the permanent dentition or anchorage is sufficient, a one-armed or arrowhead card plus base may be used as the retention device.

7) Australian wires, stainless steel arch wires and nickel-titanium wires are usually combined with brackets and are used for fixed correction, but are rarely used on a movable corrector.

8) The position that the base held in the palm is stretched out to elasticity traction wire in this device is crooked the cyclization, can rationally adjust the direction and the angle of elasticity traction wire as required to adjust reasonable big or small direction of power of correcting in three-dimensional space, enable the embedding tooth and avoid the interference that blocks of surrounding tissue, reduce the tractive resistance of embedding tooth, improve and pull the success rate.

9) The device has the advantages of easily available materials, low cost, simple manufacture, convenience, cleanness and practicability.

Description of the figures and reference numerals

FIG. 1 is a schematic view of the structure of a device for pulling an embedded tooth traction device towards the palatal side or the jaw side in the late stage or the permanent dentition stage of a mixed dentition, wherein an arrow head card is used as a fixed base;

FIG. 2 is a schematic view of the structure of the device for pulling the mixed dentition late stage or permanent dentition period embedded teeth to the palatal side or jaw side, wherein the fixed base uses a single-arm card;

FIG. 3 is a schematic view of the hybrid dentition early-stage buried tooth traction device structure drawing to the palatal side or jaw side, fully wrapped jaw pad;

FIG. 4 is a schematic diagram of the device configuration for labial traction of a hybrid advanced or permanent dentition buried tooth traction device, wherein a single arm clip is used for the fixed base;

FIG. 5 is a schematic view of the device configuration for labially retracting a hybrid late dentition or permanent dentition buried tooth retractor, wherein the fixed base uses an arrow card;

FIG. 6 is a front view of the device with the mixed dentition post-stage or permanent dentition stage submerged tooth traction device trailed labially;

FIG. 7 is a schematic view of the device for labially traction of the hybrid dentition early-stage embedded tooth traction device, fully wrapped jaw pad;

wherein, 1-a traction hook, 2-an appliance, 11-an adhesive attachment, 12-a ligature wire, 12 a-one end of the ligature wire, 12 b-the other end of the ligature wire, 21-an elastic traction wire, 22-a retention device, 21 a-one end of the elastic traction wire, 21 b-the other end of the elastic traction wire, 21 c-a ring, 221-a single-arm clip, 222-a base, 223-an arrow head clip, 224-a double-curved labial arch and 225-a full-wrapping jaw pad.

Detailed Description

The technical solutions of the present invention will be described in further detail with reference to the drawings and specific examples, but the present invention is not limited to the following technical solutions.

Example 1

As shown in fig. 1-7, an embedded tooth traction device, the device is composed of a traction hook 1 and an appliance 2, the traction hook 1 is adhered on the tooth crown of the embedded tooth to be pulled, the traction hook 1 is composed of an adhesive attachment 11 and a ligature wire 12, one end 12a of the ligature wire is fastened on the adhesive attachment 11, the other end 12b of the ligature wire is free and bent into a hook, the appliance 2 is composed of an elastic traction wire 21 and a fixing device 22, one end 21a of the elastic traction wire is embedded in the fixing device 22, the tail end is bent, the other end 21b of the elastic traction wire is bent or not bent, and is detachably connected with the bent hook at the other end 12b of the ligature wire on the traction hook. The elastic traction wire 21 can also be combined with an invisible appliance, and the invisible appliance is used as a retention device 22. The elastic traction wire 21 is bent into a ring 21c at the position extending out of the retention device 22, the number of the rings is 1-2 to increase the elasticity, and the number of the rings is determined according to the required traction force and the softness degree. The elastic traction wire 21 is made of an Australian wire, an orthodontic stainless steel arch wire or a nickel titanium wire. The structure and shape of the retention device 22 are mainly determined by the direction of the traction force required for traction of the embedded tooth and the height and integrity of the crowns of the teeth except the embedded tooth in the dentition where the embedded tooth is located.

As shown in fig. 1-3, if the direction of the traction force is toward the palatal side or the jaw side, when the dentition is a mixed dentition in an early stage or the damage of the dental body is serious, the retention device 22 may be a fully wrapped jaw pad, and one end 21a of the elastic traction wire is embedded at a lingual position in the fully wrapped jaw pad 225 near the position of the embedded teeth; when the dentition is in the permanent dentition stage or the later stage of the mixed dentition and the tooth body is healthy and complete, the retention device 22 is composed of a base and 2-3 single-arm clamps 221, the single-arm clamps are used for fixing the base 222, and one end 21a of the elastic traction wire is embedded in the position close to the tongue side in the base 222 of the embedded tooth position. The retention device 22 may be replaced with a Nance button. The single-arm clip 221 can be replaced by an arrow clip 223, and a double-curved lip bow 224 can be added when necessary.

As shown in Figs. 4-7, the retention means 22 may be a full-enclosed jaw pad 225, and the elastic traction wire may be used when the dentition is early mixed or the damage of the tooth is serious, such as when the traction force is directed labiallyIs/are as follows One end 21a is embedded in the labial portion of the fully-enclosed jaw pad 225; when the dentition is in the permanent dentition period or the mixed dentition later period and the tooth body is healthy and complete, the retention device 22 consists of a base 222 and 2 or more than 2 single-arm cards 221 and a double-curved labial arch 224, one end 21a of the elastic traction wire is bonded on a beam of the double-curved labial arch 224 to be curved by self-setting plastics, and the position of the double-curved labial arch 224 does not shield the buried teeth to be corrected. The adhesive attachment 11 mostly uses lingual buttons and brackets.

Adopts a full-wrapping jaw pad, and one end of an elastic traction wire is embedded in the full-wrapping jaw pad. The whole dentition, alveolar bone and mucous membrane can be used as anchorage tissues to disperse the reaction force brought by traction force; if the patient is in the permanent dentition stage, a double-curved labial arch is arranged at the position avoiding the embedded teeth, and one end of the elastic traction wire is bonded on the double-curved labial arch by self-setting plastics. The elastic traction wire is bent back to form a ring at the position exposed out of the retention device, and the extended free end is detachably connected with the traction ligature wire of the embedded tooth.

When in use, the traction hook is installed and then the appliance is worn. Different traction devices are selected according to different directions required by traction of the embedded tooth. When the embedded tooth needs to be pulled, the bent end of the ligature wire on the pulling hook is connected to the pulling tail end of the elastic pulling wire on the appliance. If not, the curved end of the ligature wire on the towing hook is separated from the towing tail end of the elastic towing wire on the appliance, as shown in phantom. When the traction hook is connected with the elastic traction wire, the restoring force generated after the elastic traction wire is deformed pulls the embedded tooth, so that the embedded tooth is subjected to the pulling force in different directions such as the palate side, the lip side, the jaw side and the like, and the embedded tooth is slowly pulled to the required direction, thereby achieving the purpose of pulling the embedded tooth; the elastic traction wire is bent back to form a ring at the position extending out of the fixing device, and the position and the direction of the free end of the elastic traction wire can be adjusted at the position so as to change the magnitude and the direction of traction force; the direction and length of the traction ligature wire can be adjusted, and the force application size and angle of the elastic traction wire are matched.

Claims (10)

1. The utility model provides an embedding tooth draw gear which characterized in that: the device comprises a traction hook (1) and an appliance (2), wherein the traction hook (1) is adhered to a dental crown of an embedded tooth required to be dragged, the traction hook (1) comprises an adhesive attachment (11) and a ligature wire (12), one end (12a) of the ligature wire is fastened on the adhesive attachment (11), the other end (12b) of the ligature wire is free and bent to form a hook, the appliance (2) comprises an elastic traction wire (21) and a retention device (22), one end (21a) of the elastic traction wire is embedded in the retention device (22), the tail end of the elastic traction wire is bent, and the other end (21b) of the elastic traction wire is detachably connected with the bent hook at the other end (12b) of the ligature wire on the traction hook.

2. The traction device according to claim 1, wherein: the elastic traction wire (21) can also be combined with an invisible appliance, and the invisible appliance is used as a retention device (22).

3. The traction device according to claim 1, wherein: the elastic traction wire (21) is bent into a ring (21c) at the position extending out of the retention device (22), the number of the rings (21c) is 1-2 to increase the elasticity, and the number of the rings is determined according to the required traction force and the softness degree.

4. The traction device according to claim 1, wherein: the elastic traction wire (21) is made of an Australian wire, an orthodontic stainless steel arch wire or a nickel titanium wire.

5. The traction device according to claim 1, wherein: the structure and the shape of the retention device (22) are mainly determined by the direction of traction force required for traction of the embedded tooth and the height and the integrity of crowns of other teeth in the dentition where the embedded tooth is positioned except the embedded tooth.

6. The traction device according to claim 5, wherein: if the direction of the traction force is towards the palate side or the jaw side, when the dentition is mixed, the early stage of the dentition or the damage of a tooth body is serious, the retention device (22) can adopt a full-wrapping jaw pad, and one end (21a) of the elastic traction wire is embedded at the lingual side position in the full-wrapping jaw pad (225) close to the position of the embedded tooth; when the dentition is in the permanent dentition period or in the later period of mixed dentition and the tooth body is healthy and complete, the retention device (22) is formed by a base and 2-3 single-arm cards (221), the single-arm cards are used for fixing the base (222), and one end (21a) of the elastic traction wire is embedded in the position of the lingual side in the base (222) close to the position of the embedded tooth.

7. The traction device according to claim 6, wherein: the retention device (22) may be replaced by a Nance button.

8. The traction device according to claim 6, wherein: the single-arm card (221) can be replaced by an arrow card (223), and a double-curved labial arch (224) can be added when necessary.

9. The traction device according to claim 5, wherein: when the direction of the traction force is towards the labial side, when the dentition is early mixed or the damage to the tooth body is serious, the retention device (22) can adopt a full-wrapping jaw pad (225), and one end (21a) of the elastic traction wire is embedded in the labial side part of the full-wrapping jaw pad (225); when the dentition is in the permanent dentition period or the later period of the mixed dentition and the tooth body is healthy and complete, the retention device (22) consists of a base (222) and 2 or more than 2 single-arm clamps (221) and a double-curved labial arch (224), one end (21a) of the elastic traction wire is bonded on a beam of the double-curved labial arch (224) to a curve by using self-setting plastics, and the position of the double-curved labial arch (224) does not shield the embedded teeth to be corrected.

10. The traction device according to claim 1, wherein: the adhesive accessories (11) mostly use tongue side buckles and brackets.

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