CN203970590U - A kind of cambered surface contact magnetic attachment - Google Patents

Abstract

It is a kind of for complying with free-end that this utility model provides, the local pressure of minimizing to abutment, alleviate abutment periodontal burden, the maintenance performance of artificial tooth and a kind of cambered surface contact magnetic attachment of stability have been increased, by Magnet portion 1, armature portion 2, yoke forms, wherein, Magnet portion 1 is placed on basal seat area 3, Magnet portion 1 has a Magnet cancave cambered surface 4, the termination portion of armature has the termination protuberance 6 of the convex globoidal 5 mutual identical with Magnet cancave cambered surface 4, armature portion 2 end afterbodys are fixedly placed in oral cavity abutment undesirable root 7, yoke is wrapped in Magnet portion 1 outside, the Magnet cancave cambered surface 4 of Magnet portion 1 is connected and fixed with the mutual magnetic attraction of termination protuberance 6 of armature portion 2, Magnet cancave cambered surface 4 is cambered surface with termination protuberance 6 contact surfaces, can effectively protect the intact type of base 3, strengthened the retention of magnetic attachment, the artificial tooth of having avoided free-end to absorb and having occurred prizes problem.

Description

A kind of cambered surface contact magnetic attachment

Technical field

This utility model relates to a kind of use accessory of oral artificial tooth, is specifically related to a kind of magnetic attachment, belongs to oral artificial tooth medical instrument field.

Background technology

At present, in the clinical practice of Oral Repair, patient for denture serious defect, doctors are usually in order to retain remaining tooth and protection residual alveolar ridge, tend to take the repair mode of overlay denture, and a kind of as in overlay denture of magnetic attachment, along with research deeply and the constantly accumulation of clinical experience, be widely used in complete mouthful overlay denture in Oral Repair, removable denture, implant-supported complete overdenture, counterfeit attached body, its volume is little and have a good retention effect, aesthetic and easily plucking such as wears at the advantage, make it in prosthetic dentistry, there is irreplaceable effect, magnetic attachment is to utilize magnetic force that artificial tooth is connected on abutment, to increase the maintenance of artificial tooth and stable device, magnetic attachment has permanent applicating history must have its irreplaceable advantage in field, oral cavity, using magnetic force maintenance, has reduced the use of snap ring, strengthens attractive in appearance, comfortableness, protected abutment, easy to clean, be easy to pluck and wear, efficiently utilize undesirable root, non-conducting side force, automatically reset etc.,

Using magnetic force maintenance, also band is served new problem simultaneously, artificial tooth easily fractures at the position of Magnet, Magnet is perishable, Magnet easily comes off, retention can weaken, easily there is gingivitis and recurrent caries in abutment, free-end frontal resorption, artificial tooth sinking etc., when closed circuit magnet settles the total artificial tooth of the position difference upper jaw stressed, base be take center line as axle, easily there is vertical folding, mandibular denture is because cross section is little, magnetic retention is mainly placed in the canine tooth or front upper of grinding one's teeth in sleep, and complete denture canine tooth position is shallow covering, shallow covering, gmatjpdumamics is mainly in backteeth district, thereby mandibular denture easily fractures,

According to many pertinent literatures and UR clinically, known wearing with the alveolar bone of most of patient after artificial tooth has absorption, no matter be removable partial denture or complete denture, along with the passing of wearing time and the continuous growth of patient age, can there is the especially absorption of alveoli dentales mandibulae bone of absorption of alveolar bone in various degree, bone resorption no matter be physiological or pathology have a several factors.The absorption of physiological alveolar bone often after exodontia First Year and the First Year of wearing artificial tooth seem more obvious, be probably 3 ~ 4mm, lower jaw 13.5 annuals absorb and highly approximately have 7mm, the upper jaw absorbs relatively less, but the treatment of the bone resorption of pathology is difficult to, and be difficult to assess, and clinical undesirable root is while obtaining suitable preservation, undesirable root alveolar bone around can be maintained, be not easy to absorb atrophy, because the abutment of magnetic attachment overlay denture mostly is canine tooth and premolars, and the strongest position of meshing functions is first molar district, therefore, easily take attachment as fulcrum, in far away, free-end sinks, cause middle position far away bone resorption, magnetic attachment can alleviate the side force of abutment, when but if artificial tooth occurs prizing because free-end absorbs, abutment still can form local fulcrum at certain on a bit, now not only increased the periodontal burden of abutment, also can cause the loose or dislocation of armature simultaneously, artificial tooth will be take undesirable root and prized or rotate as fulcrum like this, in addition, the captivation of traditional magnetic attachment is only the strongest in the direction perpendicular to adsorption plane, and it is the most weak at the tangential direction retention of adsorption plane, when there is lateral displacement between magnet and gripper shoe or become angle to throw off, retention significantly declines, in oral environment, the movement velocity of mandibular bone is approximately 50mm/min, retention at such condition lower magnet will decline rapidly, research shows, between the magnet of magnetic attachment and gripper shoe, sidesway distance reaches 0. 3 mm or when angle reaches 0. 3 ° between the two, retention 10 % that decline, during 6 ° of inclinations, between Magnet and lower jaw armature, retention almost disappears completely.

On this basis, scholars propose buffer-type magnetic attachment, or adopt the method that increases abutment to increase maintenance, but these modes also have many limiting factors clinically, As time goes on, and in oral cavity, motor system is complicated and irregular, buffer-type material is constantly aging, long-term retention effect is difficult to prediction be there are some researches show, the retention of magnetic attachment obviously declines along with the increase of distance between magnet and root cap, when distance is while reaching 0.1mm between the two, retention declines 30%.Therefore, the existence of buffer gap will cause obviously reducing of captivation between magnet and root cap, the retention that reduces artificial tooth, has many patients abutment when needs complete denture restoration to lose a lot, does not have enough conditions to strengthen retention effect by increasing abutment.

Summary of the invention

Existing defect for current magnetic attachment as Denture attachment, it is a kind of for complying with free-end that this utility model provides, the local pressure of minimizing to abutment, alleviate abutment periodontal burden, the maintenance performance of artificial tooth and a kind of cambered surface contact magnetic attachment of stability have been increased, by Magnet portion (1), armature portion (2), yoke forms, wherein, Magnet portion (1) is placed on basal seat area (3), Magnet portion (1) has a Magnet cancave cambered surface (4), the termination portion of armature has the termination protuberance (6) of the convex globoidal (5) mutual identical with Magnet cancave cambered surface (4), armature portion (2) end afterbody is fixedly placed in oral cavity abutment undesirable root (7), yoke is wrapped in Magnet portion (1) outside, the Magnet cancave cambered surface (4) of Magnet portion (1) is connected and fixed with the mutual magnetic attraction of the termination protuberance (6) of armature portion (2), Magnet cancave cambered surface (4) is cambered surface with termination protuberance (6) contact surface.

Further, the termination protuberance (6) of described armature portion (2) also comprises that convex globoidal (5) extends to outside Magnet cancave cambered surface (4) and the buffering suface (8) of receiving downwards, and the termination protuberance (6) of armature portion (2) is for being greater than the approximate hemispherical of hemisphere.

Further, described Magnet cancave cambered surface (4) is hemisphere sphere, and the end afterbody that the termination protuberance (6) of armature portion (2) is the approximate hemisphere that is greater than hemisphere of arc surface, armature portion (2) is inverted cone.

Further, described armature portion (2) and yoke select SUS316 stainless steel material, described Magnet portion (1) material to select neodymium iron boron strong magnet.

Further, described Magnet portion (1) profile can be tile or cylindric.

Operation principle of the present utility model is: a kind of cambered surface contact magnetic attachment, it is characterized in that by Magnet portion (1), armature portion (2), yoke forms, wherein, Magnet portion (1) is placed on basal seat area (3), Magnet portion (1) has a Magnet cancave cambered surface (4), the termination portion of armature has and the mutual identical protuberance of Magnet cancave cambered surface (4), armature portion (2) end afterbody is fixedly placed in oral cavity abutment undesirable root (7), yoke is wrapped in Magnet portion (1) outside, the Magnet cancave cambered surface (4) of Magnet portion (1) attracts each other and contacts with the protuberance of armature, the two contact surface is cambered surface, the contact site that the Magnet cancave cambered surface (4) of Magnet portion (1) matches with the protuberance of armature is designed to arc surface type and contacts, the main purpose of design is that arc surface type contact can comply with free-end like this, the local pressure of minimizing to abutment, alleviate abutment periodontal burden, in addition, because artificial tooth can freely be complied with sinking, do not have fulcrum to form, can reduce the probability of base (3) fracture, characteristic due to cambered surface, artificial tooth has retention in each possible dislocation direction, being different from traditional magnetic attachment only has and has in vertical direction retention, thereby maintenance performance and the stability of artificial tooth have also been increased, when Free end sinks, when adnexa is the contact of traditional plane formula, during magnetic attachment abutment is far away, do not have natural teeth to support, artificial tooth can be divided into fulcrum with abutment middle part far away and sink, and, artificial tooth in oral cavity due to the complexity of masticatory system, its motion mode also can be very complicated, comprise the cheek-tongue direction rotation in certain limit, middle-distant direction prizes, these forms of motion are for the attachment of plane formula contact, can not comply with these complicated forms of motion, arc surface type contact just in time can address these problems, he can comply with in the mode of movement in a curve the motion of artificial tooth, retention simultaneously that have again all directions, in the time of protection abutment, also can protect artificial tooth, increase patient's comfort level,

The cambered surface of the protuberance of the termination portion of described armature extends to outside Magnet cancave cambered surface (4) and downwards, receives the buffering suface (8) of one of formation, the protuberance that makes the termination portion of armature portion (2) is be greater than hemisphere approximate hemispherical, on clinical abutment, before application, there is technician to cast armature portion (2) minute, form the root cap shape adapting with abutment, the protuberance of the termination portion of armature than with Magnet portion (1) contact surface the unnecessary cap shape part growing, when cap shape portion complies with when magnet, can comply with to glide along the buffering suface (8) of the termination protuberance (6) of armature portion (2) and make arcuate movement, thereby in motor process, there is no the resistance from armature, thereby do not cause the side force to abutment, therefore armature area need to be slightly less than the area of section of root of the tooth, also make design of the present utility model can meet in theory common free-end deflection, well protected abutment,

Described armature portion (2) for termination be arc surface protuberance, end afterbody is inverted cone: research shows, the cross-sectional area of armature portion (2) is 5mm-6mm, time can meet statistics sample condition, because armature portion of the present utility model (2) is cambered surface protuberance shape, and armature portion (2) end afterbody is inverted cone, the termination protuberance (6) of armature portion (2) is non-standard spherical, be greater than hemisphere, but not complete spheroid, thereby its diameter can≤5mm, the diameter of described arc surface protuberance is no more than 5mm, armature must with abutment cervical region sectional area close contact, it is closely sealed that the edge of similar hat reparation must reach, prevent the generation of recurrent caries, the contact surface of Magnet and armature needs mutually to coincide, could form closed circuit magnetic field and prevent magnetic leakage, reach best retention effect, or occur elastically-deformable time at mucosa, Magnet can be complied with the variation of mucosa,

Described a kind of cambered surface contact magnetic attachment, it is characterized in that described Magnet portion (1) profile all can be hemispherical, tile or cylindric, described Magnet portion (1) material is selected neodymium iron boron strong magnet, described armature and yoke are selected SUS316 stainless steel material, under the corrosion resistance that guarantees cambered surface contact magnetic attachment, also guaranteed that cambered surface contact magnetic attachment forms closed magnetic circuit simultaneously, can not cause magnetic to reveal, and the configuration design of cambered surface contact magnetic attachment can be varied, as long as the contact surface of Magnet portion (1) and armature portion (2) is that arc surface type contacts, profile can be designed to cylindric (bottom surface depression), tile (radian can be adjusted arbitrarily), the profile that is such magnetic attachment can be designed to varied, can and need to select different shapes according to clinical condition, can better adapt to various Treatment need,

From foregoing, the cambered surface contact magnetic attachment that this utility model provides, because Magnet portion (1) has a Magnet cancave cambered surface (4), the termination portion of armature has and the mutual identical protuberance of Magnet cancave cambered surface (4), the contact site that the Magnet cancave cambered surface (4) of Magnet portion (1) matches with the protuberance of armature is designed to the design that arc surface type contacts, and the cambered surface of armature portion (2) termination protuberance (6) extends to receipts outside Magnet portion (1) cancave cambered surface and downwards, the protuberance that makes the termination portion of armature is the approximate hemispheric design that is greater than hemisphere, having solved traditional magnetic attachment artificial tooth easily fractures at the position of Magnet, Magnet is perishable, Magnet easily comes off, retention can weaken, easily there is gingivitis and recurrent caries in abutment, free-end frontal resorption, the problem that artificial tooth sinks, increased patient's life cycle, reduce repair rate, reduce free-end frontal resorption rate, artificial tooth deflection ratio, simultaneously, can effectively protect the complete integrity of basal seat area (3), the artificial tooth of having avoided free-end to absorb and having occurred prizes problem, reduce base (3) and abutment burden, in the time of protection abutment, also can protect artificial tooth, increase patient's comfort level, and, use the design of cambered surface contact, strengthened the multi-direction magnetic attraction of contact surface, strengthened the retention of magnetic attachment, reduced the probability of the loose or dislocation of magnetic attachment, this cambered surface contact magnetic attachment denture structure is simple simultaneously, be convenient to make and use, cost of manufacture and technique have been reduced, efficiency and the convenience of making have been improved.

Accompanying drawing explanation

Fig. 1 is a kind of structural representation of cambered surface contact magnetic attachment,

Fig. 2, Fig. 3 are a kind of using state figure of cambered surface contact magnetic attachment,

Fig. 4 is the design principle schematic diagram of buffering suface structure,

Fig. 5 is that Magnet portion is columniform schematic diagram;

Fig. 6 is that Magnet portion is the schematic diagram of tile;

Wherein: 1-Magnet portion, 2-armature portion, 3-base, 4-Magnet cancave cambered surface, 5-convex globoidal, 6-termination protuberance, 7-undesirable root, 8-buffering suface.

The specific embodiment

Embodiment 1: as shown in Figure 1, this utility model provides a kind of cambered surface contact magnetic attachment, by Magnet portion 1, armature portion 2, yoke forms, wherein, Magnet portion 1 is placed on basal seat area 3, Magnet portion 1 has a Magnet cancave cambered surface 4, the termination portion of armature has the termination protuberance 6 of the convex globoidal 5 mutual identical with Magnet cancave cambered surface 4, armature portion 2 end afterbodys are fixedly placed in oral cavity abutment undesirable root 7, yoke is wrapped in Magnet portion 1 outside, the Magnet cancave cambered surface 4 of Magnet portion 1 is connected and fixed with the mutual magnetic attraction of termination protuberance 6 of armature portion 2, Magnet cancave cambered surface 4 is cambered surface with termination protuberance 6 contact surfaces, further, the cambered surface of the termination protuberance 6 of described armature portion 2 extends to outside Magnet cancave cambered surface 4 and downwards and receives and form buffering suface 8, the protuberance of the termination portion of armature portion 2 is be greater than hemisphere approximate hemispherical,

Further, being shaped as of described Magnet portion 1 is hemispherical, Magnet cancave cambered surface 4 is hemisphere sphere, and the termination protuberance 6 end afterbodys for the approximate hemisphere that is greater than hemisphere of circular arc spherical surface, armature portion 2 of armature portion 2 are inverted cone; Armature portion 2 and yoke select SUS316 stainless steel material, described Magnet portion 1 material to select neodymium iron boron strong magnet, and Magnet carries out combination with yoke employing laser weld mode;

As shown in Figure 2, the undesirable root 7 of fixed armature portion 2 need to improve root canal, need to there be enough length and thickness to guarantee drag and retention, Crown-down technique, retain the sealing of 3-4mm tip of a root, use silicone rubber delivery, with finished product armature, cast and match with the root pipe after preparation, finally use glass ion bonding, armature portion 2 is fixed in root pipe, during fixed magnets portion, armature portion 2 and undesirable root 7 be around coated with paraffin oil prevent self curing plastic and armature bonding, magnet portion is placed on the termination protuberance 6 of armature portion 2 coincide with it, at artificial tooth respective sets surface of second order, grind magnet nest simultaneously, and prepare the overflowing road that diameter is about 2mm, use self curing plastic bonded magnet and basal seat area 3 in the wire drawing phase, after self curing plastic solidifies completely, take off artificial tooth, remove unnecessary self curing plastic, polishing, armature portion 2 and the bonding of Magnet portion 1 have just completed,

Magnet portion 1 and the armature portion of connecing touch determining of area and mainly according to the size of abutment section, determine, armature portion 2 must with abutment cervical region sectional area close contact, it is closely sealed that the edge of similar hat reparation must reach, prevent the generation of recurrent caries, Magnet portion 1 needs mutually to coincide with the contact surface of armature portion 2, could form closed circuit magnetic field and prevent magnetic leakage, reach best retention effect, therefore determine Magnet portion 1 and armature portion 2 areas, need to measure root of the tooth buccolingual diameter and the nearly central diameter far away of abutment, had Research statistics Chinese's tooth neck portion buccolingual diameter and nearly far away central diameter, result is as shown in the table:

root of the tooth cervical region section gauge statistical value table

Ya Wei Jia tongue footpath mm(is at enamelo-cemental junction) nearly far away central diameter mm(enamelo-cemental junction root is to 2mm)

Max min average value standard deviation max min average value standard deviation

1 7.32 5.72 6.38 0.4222 6.80 5.38 6.28 0.4301

2 6.78 4.84 5.89 0.4606 6.68 3.60 4.79 0.5933

3 9.20 7.00 7.94 0.5197 6.82 4.84 6.01 0.8141

4 10.10 7.12 8.41 0.7460 6.10 4.42 5.01 0.3350

5 9.20 7.10 8.08 0.6250 5.80 4.24 4.73 0.3313

6 11.60 9.50 10.48 0.5216 8.82 6.88 7.58 1.0878

7 11.68 9.00 10.39 0.7427 8.74 6.40 7.47 0.4677

1 6.10 4.60 5.27 0.3537 4.80 2.80 3.45 0.4372

2 6.88 5.00 5.97 0.4253 4.60 3.10 3.76 0.3469

3 9.00 6.20 7.62 0.6854 6.30 4.54 5.13 0.3387

4 9.00 6.12 7.18 0.6911 5.58 4.10 4.83 0.3653

5 8.74 6.10 7.22 0.5230 5.92 4.12 4.93 0.3415

6 11.58 8.34 9.44 0.7557 10.02 7.00 8.96 0.7702

7 11.32 8.12 9.02 0.7668 10.00 6.54 8.60 0.7080

Clinically, it is generally canine tooth and premolars that magnetic attachment abutment is selected, Gu it is reference that armature portion 2 areas be take canine tooth and premolars area of section meansigma methods, because Magnet portion 1 and armature portion 2 parts generally can be made into finished product, on clinical abutment, before application, there is technician to cast armature portion 2 parts, form the root cap shape adapting with abutment, therefore armature portion 2 areas need to be slightly less than the area of section of root of the tooth, by: table 1 can be found out, the cross-sectional area of the termination protuberance 6 of armature portion 2 is 5mm*6mm, time can meet statistics sample condition, the termination protuberance 6 of armature portion 2 is the non-standard spherical hemisphere that is greater than, but not complete spheroid, thereby its diameter can≤5mm,

The size of the termination protuberance 6 of Magnet portion 1 and armature portion 2 also will be with reference to vertical dimension, the size of adnexa can not surpass vertical dimension, at this, parameter with reference to the serial magnetic attachment of current Magfit EX conventional on clinical oral, the data that provide according to the parameter material of Magfit EX series magnetic attachment, in conjunction with ferromagnetic material fragility, the factors such as clinical practice operation possibility and experiment condition restriction are tentatively determined the design parameter design of sphere contact type magnetic attachment, as shown in Figure 3, R is the radius of Magnet portion 1, r is the radius of armature portion 2, L be the unnecessary Magnet of termination protuberance 6 portion 1 contact surface be partly buffering suface 8 height, the termination protuberance 6 of armature portion 2 need to be made into non-hemisphere and have a buffering suface 8, object is when magnet is complied with, can comply with along buffering suface 8 surfaces glides makes arcuate movement, in motor process, there is no the resistance from armature, thereby do not cause the side force to abutment, the amount that the numerical values recited of L need to may be sunk according to artificial tooth is calculated,

as following table permanent teeth tooth bulk measurement statistical table represents:

The wide neck breadth of the long hat of total length crown length root is preced with thick neck depth

1 22.8 11.5 11.3 8.6 6.3 7.1 6.2

2 21.5 10.1 11.5 7.0 5.0 6.4 5.9

3 25.2 11.0 14.2 7.9 5.7 8.2 7.7

4 20.5 8.5 12.1 7.2 4.9 9.5 8.4

5 20.5 7.8 12.7 6.7 4.6 9.3 8.3

6 19.7 7.3 12.4 10.1 7.6 11.3 10.5

7 19.3 7.4 11.9 9.6 7.6 11.4 10.7

8 17.9 7.3 10.6 9.1 7.3 11.2 10.3

1 19.9 9.0 10.7 5.4 3.6 5.7 5.3

2 21.0 9.5 11.5 6.1 4.0 6.2 5.9

3 24.6 11.1 13.5 7.0 5.4 7.9 7.5

4 20.9 8.7 12.3 7.1 4.9 7.9 6.9

5 20.5 7.9 12.6 7.1 4.9 8.3 7.0

6 20.5 7.6 12.9 11.2 8.9 10.5 8.6

7 19.1 7.6 12.3 10.7 8.5 10.4 8.7

8 18.0 7.1 12.9 11.1 9.2 10.4 8.9

Free-end distal-most end is designed to second molar, abutment is set as frist premolar, in conjunction with the nearly central diameter data far away of tooth, as shown in Figure 4: F is that suffered down force, deflection distance are for S, free-end are apart from being H, when Magnet portion 1 rotates at utmost: L/S=1.4/H calculates: when attachment design is during at canine tooth, can deflection S1=11.31mm; When attachment design is during at frist premolar, can deflection S2=9.3mm;

When attachment design is during at the second premolars, can deflection S3=7.27mm, according to data show, termination protuberance 6 by armature portion 2 is the approximate hemispheric design that is greater than hemisphere, making design of the present utility model can at least meet in theory free-end deflection is 7.27mm, above data show, it is that 7.27mm is even more that design of the present utility model can meet free-end deflection in theory, or occur elastically-deformable time at mucosa, Magnet can be complied with the variation of mucosa, according to clinicist's experience, when sinking, free-end should carry out in time the heavily title of artificial tooth when obvious, but not the compliance of dependence adnexa, simultaneously, selection with reference to magfit magnetic attachment material, determined the material of sphere contact type magnetic attachment, that is: ferromagnetic material is selected neodymium iron boron strong magnet, armature and yoke are selected SUS316 stainless steel material, wherein, the radial design of Magnet portion 1 is 3.2mm, the radius of armature portion 2 termination protuberances 6 is 1.4mm, magnet thickness is 1.8mm, armature portion 2 termination thickness are 2.2mm,

The in-vitro measurements of retention:

Magfit EX 600 magnetic attachment mark magnetic force are 600gf, but while using in oral environment, strength weakens, and along with passage of time, its retention is in continuous decline, absorption along with free-end, attachment be take abutment as fulcrum formation perk, between Magnet and armature, form certain angle, this phenomenon of this experimental basis, retention while measure respectively 0 °, 3 °, 7 ° and 16 °, retention while simultaneously measuring hemispherical magnetic attachment inclination different angles, parallel statistical analysis.

experiment material and method

1.1 experiment materials and equipment

Digital display type pull and push dynamometer (Chengdu San He measurer company limited, China)

Electrodynamic type single-column tester table (Shanghai Si Wei instrument manufacturing company limited, China)

Make tooth resin and monomer (Shanghai Medical Instrument Co., Ltd., China)

1.2 experimental technique

Digital display type pull and push dynamometer is arranged on electrodynamic type single-column tester table, first-class clamping device, make self curing plastic blockage, respectively Magnet and armature are fixed on upper lower clamp, holding magnet and armature are on same vertical line, the speed of adjusting test machine is 50mm/min, measure peak value ten times, and measure 3 ° respectively, 7 °, retention after 16 °, record data averaged, can measure in this experiment the open magnetic field retention of arc-shaped magnet and cylindrical magnetic iron, and the size of the closed circuit magnetic field of hemispherical Magnet retention, in test, armature portion 2 and Magnet portion 1 fixing all adopted to dentistry self curing plastic is bonding to be individually fixed on test desk and strain gauge, vertically to stressed, pulling force speed is 50mm/min, range 30mm.

1.2.1magfit the outer maintenance force measurement of magnetic attachment mouth:

1.2.2 hemispherical magnetic attachment retention test

Hemispherical Magnet is the main object of this experiment, retention size while measure respectively 0 °, 3 °, 7 ° and 16 °, the yoke of Magnet portion 1 is made by SUS316 rustless steel, is divided into ball cap part and cast part, finally with laser welding technology, Magnet is combined with these two parts

Test result the external retention of Magfit EX 600 magnetic attachment is measured

the closed circuit magnetic field of hemispherical Magnet retention test gf

conclusion:

(1) magfit EX 600 measurement results are carried out to statistical analysis, through one factor analysis of variance, compare between two significance P=0, between each group, have significant difference, after tilting there is obviously change in retention.

(2) the average retention of Magfit EX 600 is 281.25gf, tilts 3 °, and retention average out to 185.24gf, declines 34.13%; Tilt 7 °, retention average out to 88.97gf, declines 68.37%: tilt 16 °, retention average out to 38.62gf, declines 86.27%.

(3) hemispherical magnetic attachment is when through 0 °, 3 °, 7 °, 16 °, and Analysis of variance is reached a conclusion, no difference of science of statistics between each group, P>0.05.Be hemispherical magnetic attachment after over-rotation, retention does not decline.

From foregoing, the cambered surface contact magnetic attachment that this utility model provides, because Magnet portion 1 has a Magnet cancave cambered surface 4, the termination portion of armature has and the mutual identical protuberance of Magnet cancave cambered surface 4, the contact site that the Magnet cancave cambered surface 4 of Magnet portion 1 matches with the protuberance of armature is designed to the design that arc surface type contacts, and the cambered surface of armature portion 2 termination protuberances 6 extends to receipts outside Magnet portion 1 cancave cambered surface and downwards, the protuberance that makes the termination portion of armature is the approximate hemispheric design that is greater than hemisphere, having solved traditional magnetic attachment artificial tooth easily fractures at the position of Magnet, Magnet is perishable, Magnet easily comes off, retention can weaken, easily there is gingivitis and recurrent caries in abutment, free-end frontal resorption, the problem that artificial tooth sinks, increased patient's life cycle, reduce repair rate, reduce free-end frontal resorption rate, artificial tooth deflection ratio, simultaneously, can effectively protect the complete integrity of basal seat area 3, the artificial tooth of having avoided free-end to absorb and having occurred prizes problem, reduce base 3 and abutment burden, in the time of protection abutment, also can protect artificial tooth, increase patient's comfort level, and, use the design of cambered surface contact, strengthened the multi-direction magnetic attraction of contact surface, strengthened the retention of magnetic attachment, reduced the probability of the loose or dislocation of magnetic attachment, this cambered surface contact magnetic attachment denture structure is simple simultaneously, be convenient to make and use, cost of manufacture and technique have been reduced, efficiency and the convenience of making have been improved.

Embodiment 2: as shown in Figure 5, be that with the difference of above-described embodiment 1 being shaped as of Magnet portion 1 is cylindric.

Embodiment 3: as shown in Figure 6, be the tile that is shaped as of Magnet portion 1 with the difference of above-described embodiment 1.

Claims (5)

1. a cambered surface contact magnetic attachment, by Magnet portion (1), armature portion (2), yoke forms, wherein, it is characterized in that: Magnet portion (1) is placed on basal seat area (3), Magnet portion (1) has a Magnet cancave cambered surface (4), the termination portion of armature has the termination protuberance (6) of the convex globoidal (5) mutual identical with Magnet cancave cambered surface (4), armature portion (2) end afterbody is fixedly placed in oral cavity abutment undesirable root (7), yoke is wrapped in Magnet portion (1) outside, the Magnet cancave cambered surface (4) of Magnet portion (1) is connected and fixed with the mutual magnetic attraction of the termination protuberance (6) of armature portion (2), Magnet cancave cambered surface (4) is cambered surface with termination protuberance (6) contact surface.

2. a kind of cambered surface contact magnetic attachment according to claim 1, the termination protuberance (6) that it is characterized in that described armature portion (2) also comprises that convex globoidal (5) extends to outside Magnet cancave cambered surface (4) and the buffering suface (8) of receiving downwards, and the termination protuberance (6) of armature portion (2) is for being greater than the approximate hemispherical of hemisphere.

3. a kind of cambered surface contact magnetic attachment according to claim 1 and 2, it is characterized in that described Magnet cancave cambered surface (4) is hemisphere sphere, the end afterbody that the termination protuberance (6) of armature portion (2) is the approximate hemisphere that is greater than hemisphere of arc surface, armature portion (2) is inverted cone.

4. a kind of cambered surface contact magnetic attachment according to claim 3, is characterized in that described armature portion (2) and yoke selection SUS316 stainless steel material, described Magnet portion (1) material selection neodymium iron boron strong magnet.

5. a kind of cambered surface contact magnetic attachment according to claim 1, is characterized in that described Magnet portion (1) profile can be hemispherical, tile or cylindric.