CN105769354A - Recovery method for early loss of mixed dentition spaces of children - Google Patents
Recovery method for early loss of mixed dentition spaces of children Download PDFInfo
- Publication number
- CN105769354A CN105769354A CN201610198851.0A CN201610198851A CN105769354A CN 105769354 A CN105769354 A CN 105769354A CN 201610198851 A CN201610198851 A CN 201610198851A CN 105769354 A CN105769354 A CN 105769354A
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- China
- Prior art keywords
- arch wire
- main arch
- gap
- chute
- ring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/14—Brackets; Fixing brackets to teeth
- A61C7/16—Brackets; Fixing brackets to teeth specially adapted to be cemented to teeth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/20—Arch wires
Abstract
The invention discloses a recovery method for early loss of mixed dentition spaces of children. The method is characterized by mainly comprising the following steps: preparing a space recovery and maintaining device; preparing an oral cavity model; preparing a functional tip; wearing the functional tip; and applying stress. The device mainly comprises a retention ring, a slide chute, a main arch wire, a stress applying spring and a baffle plate, wherein the slide chute is fixedly connected with the outer side surface of the retention ring; a penetrating hole adapting to the outline of the main arch wire is formed in the slide chute; a retention hook is arranged on the side wall of the front end of the slide chute; the main arch wire is provided with a U-shaped curve at the front position of the slide chute; and a mobile rod is arranged at the rear end of the U-shaped curve. The device disclosed by the invention is reasonable in design, simple in structure, convenient to use and relatively good in effect of maintaining and recovering mixed dentition spaces of the children.
Description
Technical field
The present invention relates to field of oral cavity medical equipment, particularly a kind of restoration methods again lost for child for spaced dentition early stage.
Background technology
Caries in primary teeth is the sick kind common and the most occurred frequently in Pediatric Oral Emergency disease, and especially its caries prevalence rate of deciduous molar is high, serious dental caries bad person can concurrent periapical abscess, alveolar abscess etc. finally must be pulled out, and is the main cause causing deciduous molar early mistake.Deciduous molar early loses, and tends to cause that adjacent teeth shifts, and arch length reduces, and dental arch is asymmetric, so that inheriting permanent teeth dislocation eruption or the impacted, causes the crowded generation waiting malformation of occlusion.The child of premature shedding of deciduous tooth is compared with normal children, it is necessary to the probability carrying out follow-up orthodontic treatment will increase by 3 times.Research finds that the incidence rate that premature shedding of deciduous tooth post gap diminishes is relevant with the interval length after exodontia, interval is more long, the gap amount of diminishing is more big, the rear extraction of tooth space having at least 96% in more than 1 year of having tooth pulled out diminishes, minimizing amount severe patient in gap is up to 5mm, causing dental depth seriously to reduce, the later stage must have tooth pulled out rectification.Therefore, how reasonable management deciduous molar early lose after gap, induction bioocclusion is set up, prevention patho-occlusion occurs, avoids the orthodontic treatment of the follow-up complexity of infant to be clinical oral doctor's frequently problem.Clinic commonly uses the gap after space maintainer manages premature shedding of deciduous tooth at present, and clinical common keeper kind has: semi-fixed type cast space maintainer, ring type space maintainer, and band wire ring formula space maintainer etc. maintains the gap after deciduous molar early loses.
More than conventional method has bigger defect clinically, major defect has: (1) is mainly used in maintaining the gap after deciduous molar early loses, or the gap enlargement of trace, when gap reduces when more than 1mm, conventional space maintainer cannot expand gap, the adjacent teeth of reach cannot return to initial position, and further results in the generation of involutory tooth malocclusion.(2) though can afterburning inching, its correction strength cannot be controlled, and gap keeps the Mixed dention that is all used in child, and its strength is necessary for low force, is generally about 60 gram forces.(3), after primary molars loss, adjacent teeth moves to mesial inclination often, though general gap keeper can afterburning inching, its grind one's teeth in sleep also be straight line backward, it is impossible to complete toward tilting in remote then upright.(4) just having, after in common fine setting space maintainer tape entry, the strength directly expanding gap, and cannot take out adjustment after wearing and boning, child is as specific group, its intelligence is not yet reached maturity, uncomfortable easily caused by infant, it is impossible to accomplish first to allow infant adapt to keeper more afterburning.
Summary of the invention
For prior art exist deficiency, the invention provides a kind of have gap keep and recover function space maintainer, and provide a kind of adopt this device for child for spaced dentition early stage lose restoration methods again.
The present invention adopts the following technical scheme that
1) prepare gap to recover and holding means: this device mainly includes maintenance ring, chute, main arch wire, energizing spring and baffle plate；Described chute is fixing with the lateral surface of maintenance ring to be connected, and is provided with the perforation adapted with main arch wire outline in chute, and the front end side wall of chute is provided with maintenance hook；Described main arch wire is positioned at chute anterior position and is provided with U-shaped song, and U-shaped Qu Houduan is provided with mobile bar, its can in the perforation of chute slide anteroposterior；The front end of energizing spring is fixing connects baffle plate, and rear end is connected with the front end of main arch wire；The front end of described main arch wire is provided with scale；The front end of described energizing spring is provided with spring ring for fixing；Described main arch wire is provided with main arch wire ring for fixing near the front end of U-shaped song；The mesial margin of described maintenance ring is provided with function network；Described chute be arranged over main arch wire ceiling；
2) produce oral cavity model and adjust gap recovery and holding means: size selects suitable maintenance ring according to grinding one's teeth in sleep in patient oral cavity, buccal impression is produced after entering to grind one's teeth in sleep by maintenance endless belt, die medical gypsum irrigates, take out after Gypsum Fibrosum hardening and be oral cavity model, maintenance ring is transferred on the grinding one's teeth in sleep of oral cavity model, by vernier caliper measurement edentulous space and calculate primary molars loss post gap windage on model, main arch wire is inserted in the chute of maintenance ring side, adjust UXing Qushi winner arch wire and be suitable for the oral soft tissue of different patient, the distal surface of the baffle plate nearly Tooth of closely connected edentulous space of main arch wire leading portion, main arch wire is determined according to gap windage in the length that chute back segment is reserved, again main arch wire end is bent into a ring song and namely draws circle；Such as calculate primary molars loss post gap to scatter and disappear 3mm, then the length that main arch wire is reserved after going out chute should be 3mm, more main arch wire end is bent into a ring song namely draws circle；
3) preparing function point: situation according to involutory dental articulation on model, recover in gap and fill light-cured resin on the function network of holding means, mould standby function point according to the antagonist of relevant position, photo solidification machine is standby after irradiating hardening；
4) wear: gap is recovered and holding means is tried in patient oral cavity, it is ensured that be bonded and fixed at maintenance ring with binding agent on grinding one's teeth in sleep after suitable oral hard and soft tissue gap to be recovered and holding means is brought in patient's mouth；Slide main arch wire, makes baffle plate just withstand the remote middle proximal surface of the nearly Tooth of edentulous space, then traction circle and maintenance hook ligation is fixed with the stainless steel silk of ligation, it is prevented that main arch wire slides in oral cavity, and now energizing spring is in the not compressive state of the first graduation mark；
5) afterburning: to adapt to after this device, regulate main arch wire until patient oral cavity afterburning, namely with the stainless steel silk of ligation, main arch wire is moved forward by traction circle and maintenance hook ligation, make energizing spring compress and move to the second graduation mark, playing the effect precisely continuing to load low force；According to patient profiles, every 1 to 2 month afterburning 1 time；
6) gap keeps: after gap is recovered, the ring for fixing of ligation spring ring for fixing and the U-shaped Qu Qianduan of main arch wire, then the maintenance hook of the traction circle of the main arch wire end of ligation and arc chute front end, is used for maintaining gap.
As preferably, the cross section of above-mentioned main arch wire is rectangle or square.
The remote middle gum edge width of described maintenance ring is less than nearly middle gum edge width.
Described scale is provided with three graduation marks, and each scale represents 60g power.
Compared with prior art, this patent has the advantage that and beneficial effect: (1) this gap is recovered and holding means reinforcing is for continuing low force, and strength is soft, meets the biomechanics of tooth, doctor can be accurately afterburning according to the force value graduation mark of device, it is to avoid adding carrying force causes the damage of tooth.(2) when deciduous molar early loses post gap minimizing amount more than 1mm, this device according to gap deletion condition, can adjust the length of mobile bar, regularly the afterburning gap recovering to lose.(3) premature shedding of deciduous tooth need to wear the patient of space maintainer, the general age is less, and high during the far middle gingiva covering position of sixth-year molar corona is relatively near, the maintenance ring design of apparatus of the present invention fully takes into account this point, gum edge width in remote is reduced, to prevent from wearing the fashionable damage to remote middle gingiva.(4) on main arch wire design have U-shaped song, can according to the situation adjustment of the curvature of dental arch and the gingiva concrete condition with applicable oral cavity, additionally, U-shaped song also have increase arch wire elastic and slight adjust reinforcing effect.(5) this keeper can be afterburning stage by stage, namely not afterburning when just wearing in infant mouth, allows infant adapt to keeper, after infant adapts to, more afterburning by the stainless steel wire ligation of ligation, reinforcing in two months once, recovers until gap.(6) this space maintainer has the function expanding gap and maintenance concurrently, namely losing after gap recovers, ligation spring ring for fixing and main arch wire ring for fixing, make spring be compressed completely, the traction circle of the main arch wire end of ligation and the maintenance hook of arc chute front end, play the effect maintaining gap again.(7) chute of arc, moves after being conducive to the rotation of the first molar turned forward, and moves after non-rectilinear, be conducive to sixth-year molar to return to original position.(8) the mesial margin design of apparatus of the present invention maintenance ring has function network, and function network makes function cusp by potting resin, after improving absence of tooth on the one hand, and the masticatory efficiency of edentulous region, the elongation of involutory tooth after moving after preventing sixth-year molar on the other hand.(9) chute is arranged over main arch wire ceiling, it is prevented that cause main arch wire to deform when foods such as teeth chewing bones.In a word, space maintainer provided by the invention, reasonable in design, simple in construction, easy to use, on child's edentulous space keeps and recovers, there is good promotional value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the use status architecture schematic diagram of the present invention；
Fig. 3 is main arch wire cross section is rectangular schematic cross-section；
Fig. 4 is main arch wire cross section is foursquare schematic cross-section；
In figure: 1-maintenance ring；2-chute；The main arch wire of 3-；3a-draws circle；3b-U type is bent；3c scale；4-maintenance hook；5-energizing spring；6-baffle plate；7-function network；8-stainless steel silk；The main arch wire ceiling of 9-；A-spring ring for fixing；The main arch wire ring for fixing of B-.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described.
A kind of gap is recovered and holding means, and this device mainly includes maintenance ring 1, chute 2, main arch wire 3, energizing spring 5 and baffle plate 6；Described chute 2 is fixing with the lateral surface of maintenance ring 1 to be connected, and is provided with the perforation adapted with main arch wire 3 outline in chute 2, and the front end side wall of chute 2 is provided with maintenance hook 4；Main arch wire 3 is positioned at chute 2 anterior position (i.e. diastema position) and is provided with U-shaped bent 3b, and the main arch wire of U-shaped bent 3b rear end is referred to as mobile bar, its can in the perforation of chute 2 slide anteroposterior；The front end of energizing spring 5 is fixing connects baffle plate 6, and rear end is connected with the front end of main arch wire 3.Main arch wire 3 is after the perforation of chute 2, and its end need to manually be curved, and makes traction circle 3a.Now, maintenance circle 3a is positioned at the tail end of main arch wire 3, and U-shaped bent 3b is positioned at the middle part of main arch wire 3, for mobile bar between U-shaped bent 3b and maintenance circle 3a, can in the perforation of chute 2 slide anteroposterior.The front end of energizing spring 5 is fixing connects baffle plate 6, and rear end is connected with the front end of main arch wire 3, and main arch wire 3 inserts energizing spring device, by insertion number regulate the elastic force of energizing spring.Energizing spring device is prior art, then this does not repeat.In order to realize afterburning size more accurately, it is provided with scale 3c in the front end of main arch wire 3, is followed successively by first, second and third totally 3 graduation marks from front to back, move forward a graduation mark and represent and add 60g power.The front end of energizing spring 5 is provided with spring ring for fixing A；Main arch wire 3 is provided with main arch wire ring for fixing B near the front end of U-shaped bent 3b.
In order to realize the main better stability of arch wire 3, the cross section of main arch wire 3 is preferably rectangle or square, certainly, because using in the oral cavity, in order to comfortable and be unlikely to lesion ports intraluminal tissue, the outline of main arch wire 3 need round and smooth and without sharp-pointed corner angle or tip.
Gap holding device designed by the present invention, the chute 2 of its maintenance ring 1 lateral surface is preferably devised to the arc raised up, and this design moves after being conducive to the rotation of first molar turned forward, and moves after non-rectilinear, is conducive to sixth-year molar to recover original position.
Additionally, owing to premature shedding of deciduous tooth need to wear the patient of space maintainer, the general age is less, it is high during the far middle gingiva covering position of sixth-year molar corona is relatively near that (tooth is referred to as mesial surface near the one side of dental arch center line clinically, one side away from dental arch center line is referred to as distal surface), the maintenance ring 1 designed by the space maintainer designed by the present invention, it is to improve to form on existing band basis, reduce by band gum edge width in remote, fashionable to the damage of gingiva in remote to prevent from wearing.
For the elongation of involutory tooth after moving after preventing sixth-year molar, the mesial margin of apparatus of the present invention maintenance ring is preferably devised with function network, and function network makes function cusp by potting resin, after function cusp can also improve absence of tooth, and the masticatory efficiency of edentulous region.
Laboratory rodent chow is often wanted because of tooth, especially when the first-class harder food of chewing bone, easily cause main arch wire 3 bending deformation effect gap recover and keep effect, also likely cause that main arch wire 3 is immovable in chute 2, when deforming serious, also need to the maintenance more renewed.In order to overcome this shortcoming, the present invention is provided above main arch wire ceiling 9 at chute 2, is used for protecting main arch wire 3 indeformable.
During use, by following operating procedure:
1) prepare above-mentioned gap to recover and holding means:
2) produce oral cavity model and adjust gap recovery and holding means: maintenance endless belt being entered after grinding one's teeth in sleep in patient oral cavity and produces buccal impression, die medical gypsum irrigates, take out after Gypsum Fibrosum hardening and be oral cavity model, such maintenance ring is transferred on the grinding one's teeth in sleep of oral cavity model, by vernier caliper measurement edentulous space and calculate primary molars loss post gap windage on model, main arch wire is inserted in the chute of maintenance ring side, adjust UXing Qushi winner arch wire and be suitable for the oral soft tissue of different patient, main arch wire need to reserve certain length at chute back segment, this reserved length is determined by manner below: the baffle plate of main arch wire leading portion first firmly props up the distal surface of the nearly Tooth of edentulous space, spring is compressed completely, then make marks on the main arch wire of runner rear end, bend ring song at labelling rear and namely draw circle 3a.Main arch wire is determined according to gap windage in the length that chute back segment is reserved, such as calculate the lost 3mm of primary molars loss post gap, when energizing spring is fully compressed, the length that then main arch wire is reserved after going out chute should be 3mm, more main arch wire end is bent into a ring song namely draws circle 3a.
3) preparing function point: situation according to involutory dental articulation on model, recover in gap and fill light-cured resin on the function network 7 of holding means, mould standby function point according to the antagonist of relevant position, photo solidification machine is standby after irradiating hardening；
4) wear: gap is recovered and holding means is tried in patient oral cavity, it is ensured that be bonded and fixed at maintenance ring with binding agent on grinding one's teeth in sleep after suitable oral hard and soft tissue gap to be recovered and holding means is brought in patient's mouth；Slide main arch wire, makes baffle plate just withstand the remote middle proximal surface of the nearly Tooth of edentulous space, then traction circle and maintenance hook ligation is fixed with the stainless steel silk of ligation, it is prevented that main arch wire slides in oral cavity, and now energizing spring is in the not compressive state of the first graduation mark；
5) afterburning: to adapt to after this device, regulate main arch wire until patient oral cavity afterburning, namely with the stainless steel silk of ligation, main arch wire is moved forward by traction circle and maintenance hook ligation, make energizing spring compress and move to the second graduation mark；The degree of ligation can be fixed according to main arch wire leading portion spring graduation apparatus, and a usual scale represents 60 gram forces.The effect precisely continuing to load low force can be played.According to patient profiles, every 1 to 2 month afterburning 1 time.
6) gap keeps: after gap is recovered, the ring for fixing of ligation spring ring for fixing and the U-shaped Qu Qianduan of main arch wire, then the maintenance hook of the traction circle of the main arch wire end of ligation and arc chute front end, is used for maintaining gap.
This device is reasonable in design, simple in construction, easy to use, can early stage fast quick-recovery edentulous space, it is prevented that increasing the weight of of malocclusion, has good promotional value on child's edentulous space keeps and recovers.
Claims (4)
1. the restoration methods again lost for spaced dentition early stage for child, it is characterised in that comprise the steps:
1) prepare gap to recover and holding means: this device mainly includes maintenance ring (1), chute (2), main arch wire (3), energizing spring (5) and baffle plate (6)；Described chute (2) is fixing with the lateral surface of maintenance ring (1) to be connected, and is provided with the perforation adapted with main arch wire (3) outline in chute (2), and the front end side wall of chute (2) is provided with maintenance hook (4)；Described main arch wire (3) is positioned at chute (2) anterior position and is provided with U-shaped song (3b), and U-shaped song (3b) rear end is provided with mobile bar, its can in the perforation of chute (2) slide anteroposterior；The front end of energizing spring (5) is fixing connects baffle plate (6), and rear end is connected with the front end of main arch wire (3)；The front end of described main arch wire (3) is provided with scale (3c)；The front end of described energizing spring (5) is provided with spring ring for fixing (A)；Described main arch wire (3) is provided with main arch wire ring for fixing (B) near the front end of U-shaped song (3b)；The mesial margin of described maintenance ring (1) is provided with function network (7)；Described chute (2) be arranged over main arch wire ceiling (9)；
2) produce oral cavity model and adjust gap recovery and holding means: maintenance endless belt being entered after grinding one's teeth in sleep in patient oral cavity and produces buccal impression, die medical gypsum irrigates, take out after Gypsum Fibrosum hardening and be oral cavity model, maintenance ring is transferred on the grinding one's teeth in sleep of oral cavity model, by vernier caliper measurement edentulous space and calculate primary molars loss post gap windage on model, main arch wire is inserted in the chute of maintenance ring side, adjust UXing Qushi winner arch wire and be suitable for the oral soft tissue of different patient, the distal surface of the baffle plate nearly Tooth of closely connected edentulous space of main arch wire leading portion, main arch wire is determined according to gap windage in the length that chute back segment is reserved, again main arch wire end is bent into a ring song and namely draws circle (3a)；
3) preparing function point: situation according to involutory dental articulation on model, recover in gap and fill light-cured resin on the function network of holding means, mould standby function point according to the antagonist of relevant position, photo solidification machine is standby after irradiating hardening；
4) wear: gap is recovered and holding means is tried in patient oral cavity, it is ensured that be bonded and fixed at maintenance ring with binding agent on grinding one's teeth in sleep after suitable oral hard and soft tissue gap to be recovered and holding means is brought in patient's mouth；Slide main arch wire, makes baffle plate just withstand the remote middle proximal surface of the nearly Tooth of edentulous space, then traction circle and maintenance hook ligation is fixed with the stainless steel silk of ligation, it is prevented that main arch wire slides in oral cavity, and now energizing spring is in the not compressive state of the first graduation mark；
5) afterburning: to adapt to after this device, regulate main arch wire until patient oral cavity afterburning, namely with the stainless steel silk of ligation, main arch wire is moved forward by traction circle and maintenance hook ligation, make energizing spring compress and move to the second graduation mark, playing the effect precisely continuing to load low force；According to patient profiles, every 1 to 2 month afterburning 1 time；
6) gap keeps: after gap is recovered, the ring for fixing of ligation spring ring for fixing and the U-shaped Qu Qianduan of main arch wire, then the maintenance hook of the traction circle of the main arch wire end of ligation and arc chute front end, is used for maintaining gap.
2. a kind of restoration methods again lost for spaced dentition early stage for child according to claim 1, it is characterised in that: the cross section of described main arch wire (3) is rectangle or square.
3. a kind of restoration methods again lost in early days for spaced dentition for child according to claim 1, the remote middle gum edge width of described maintenance ring (1) is less than nearly middle gum edge width.
4. a kind of restoration methods again lost for spaced dentition early stage for child according to claim 1, it is characterised in that: described scale (3c) is provided with three graduation marks, and each scale represents 60g power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610198851.0A CN105769354B (en) | 2016-04-01 | 2016-04-01 | A kind of preparation method of recovery device again for children for spaced dentition early stage forfeiture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610198851.0A CN105769354B (en) | 2016-04-01 | 2016-04-01 | A kind of preparation method of recovery device again for children for spaced dentition early stage forfeiture |
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| Publication Number | Publication Date |
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| CN105769354A true CN105769354A (en) | 2016-07-20 |
| CN105769354B CN105769354B (en) | 2018-09-11 |
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| CN201610198851.0A Active CN105769354B (en) | 2016-04-01 | 2016-04-01 | A kind of preparation method of recovery device again for children for spaced dentition early stage forfeiture |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269191Y (en) * | 1996-07-17 | 1997-12-03 | 陕西省城固县城关镇医院 | Retainer for gap capable of enlarging gap of big teeth |
| US20040013996A1 (en) * | 2002-07-22 | 2004-01-22 | Sapian Schubert L. | Adjustable tooth spreading and uprighting device |
| JP2008532614A (en) * | 2005-03-12 | 2008-08-21 | ジュ ヨン リ | Orthodontic appliance and orthodontic method using the same |
| CN202776591U (en) * | 2012-07-12 | 2013-03-13 | 袁林天 | Wire type double-pin spring fixed orthodontic device for treating premature shedding of deciduous teeth |
| CN104287846A (en) * | 2014-10-13 | 2015-01-21 | 肖家良 | Tooth gap closure device |
-
2016
- 2016-04-01 CN CN201610198851.0A patent/CN105769354B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269191Y (en) * | 1996-07-17 | 1997-12-03 | 陕西省城固县城关镇医院 | Retainer for gap capable of enlarging gap of big teeth |
| US20040013996A1 (en) * | 2002-07-22 | 2004-01-22 | Sapian Schubert L. | Adjustable tooth spreading and uprighting device |
| JP2008532614A (en) * | 2005-03-12 | 2008-08-21 | ジュ ヨン リ | Orthodontic appliance and orthodontic method using the same |
| CN202776591U (en) * | 2012-07-12 | 2013-03-13 | 袁林天 | Wire type double-pin spring fixed orthodontic device for treating premature shedding of deciduous teeth |
| CN104287846A (en) * | 2014-10-13 | 2015-01-21 | 肖家良 | Tooth gap closure device |
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| Publication number | Publication date |
|---|---|
| CN105769354B (en) | 2018-09-11 |
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