JP3387045B2 - Archwire, method of making the same, and spherical plate therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arch wire corresponding to the curvature of an occlusal surface of a dentition and a spherical plate for making the arch wire. In particular, the present invention relates to a Monson spherical plate for making an archwire having a Monson curve to be bent and formed in order to prevent the curve of Spee of the dental arch of each individual from being broken by orthodontic full band treatment. . Furthermore, the present invention also relates to an archwire made using such a spherical plate and a method for making the same. It should be noted that the present invention, in a broader sense, relates to orthodontic treatment of teeth.

[0002]

2. Description of the Related Art In conventional orthodontic full-band treatment, emphasis is placed only on the aesthetic side, each tooth is arranged flat in an elevational view, and an archwire is created by bending along the dentition arch in a plan view. Was there.

[0003]

In such a treatment method, since each tooth is arranged flat in an elevational view, the expression of the Kristensen phenomenon, the inhibition of movement of the muscles around the jaw, and the flattening of the occlusal plane are caused. However, there was a problem that excessive pressure was applied to the teeth.

The present invention has been made in view of the problems of the prior art, and is for producing an archwire capable of preventing the Kristensen phenomenon, smoothing the movement of the muscles around the jaw, and preventing changes in the occlusal plane. An object is to provide a Monson spherical plate on which an arch chart is drawn. From another point of view, another object of the present invention is to provide an archwire having a curvature corresponding to an occlusal curved surface, and a method for making the same.

[0005]

In order to achieve the above object, in the first aspect of the present invention, a dentition arch, a memory and an arch reference line used for making an arch wire are drawn on a Monson's spherical plate.

In the present invention, the "Monson spherical plate" means
This is a substantially spherical plate having a spherical surface (or a part of the spherical surface) corresponding to a curved surface with respect to the occlusal surface of the dentition. From the lecture, the occlusal curve is called the Monson curve. Therefore, in the present invention, an imaginary spherical surface including this Monson curve will be referred to as a "Monson spherical surface" and correspondingly named a "Monson spherical plate", but the diameter dimension and the like are not limited to this definition. First, change according to the actual condition of the patient's teeth to be corrected.

The "Monson curve" in the course is
"A type of accommodative curve derived from GS Monson's spherical theory for jaw movements, which has a diameter of 8 inches (1 inch is approximately 2.
It forms a spherical surface of 54 cm. (The Encyclopedia of Color Dentistry, 1st Printing, July 20, 1976, Eiue Shoten, p. 703), which says, "Actually, something like a metal 8-inch watch glass. Use to give the occlusal ridge an accommodating curve first, which is part of a spherical surface,
Its center is in the glabella (ethmoid crest). The artificial tooth is arranged so that its incisal edge and both cheek-lingual cusps contact this spherical surface. By arranging in this way, it is possible for artificial teeth in full dentures to achieve such balanced occlusion in the condylar path during mandibular movement. Here, the Monson's sphere theory is "a hypothetical mandibular movement theory published by Monson in 1920" (source ibid.)
The condyle, the anterior incisal edge, and the buccolingual cusp of the molar are arranged on one spherical surface, and the mandibular movement is performed on this spherical surface as a gliding movement. The major axis of each tooth is toward the center of this sphere, the center of which is on the midline and in the ethmoid crow, and the radius is said to be on average 4 inches. "

Means for achieving the above object according to another aspect of the present invention will be listed below.

In a second aspect of the present invention, the concave surface of the Monson's spherical plate has an arch chart of the upper dentition arch curve and the memory arch reference line, and the front tooth contact portion has a flat portion formed flat. Is preferred.

In a third aspect of the present invention, the convex portion of the Monson's spherical plate has a lower jaw row arch curve, a memory, and an arch chart of an arch reference line drawn, and the front tooth contact portion is a flat portion formed flat. It is preferable to have.

In the fourth aspect of the present invention, it is preferable that the bottom of the Monson spherical plate is provided with legs.

In a fifth aspect of the present invention, the tooth arch curve is a curve along the contour of the outer side (cheek side) of the tooth in a projection view seen from the direction of the sphere center of the Monson spherical plate. It is preferable that the axis of symmetry of the curve passes through the center of the Monson spherical plate.

In a sixth aspect of the present invention, the arch reference line is a symmetry axis of the dentition arch curve and a tangent line at the apex of the dentition arch curve in a projection view seen from the direction of the sphere center of the Monson spherical plate. It is preferable to include.

In a seventh aspect of the present invention, the memory line is a straight line connecting the center points of the left and right canine teeth and the first and second molars of the left and right canines in a projection view seen from the direction of the sphere center of the Monson spherical plate. It is preferable to include a straight line connecting the central points.

In an eighth aspect of the present invention, the plane portion has a symmetry axis coincident with an axis of a tooth arch curve and a direction thereof is a tooth in a projection view seen from a direction of a sphere center of a Monson spherical plate. Contour the curve that is the opposite of the column arch curve,
It is preferable that the intersections of the curve and the arch curve of the dentition substantially coincide with the positions of the left and right canine teeth.

In the ninth aspect of the present invention, it is preferable that the Monson's spherical plate includes one having a standard radius of curvature or various sizes different from the standard size.

In a tenth aspect of the present invention, the Monson spherical plate is a partial spherical surface corresponding to the curvature of the occlusal surface of the dentition,
And preferably a memory for measuring the position of the dental arch curve or arch wire drawn or mounted on the spherical surface.

In the eleventh aspect of the present invention, it is preferable that the Monson spherical plate has a flat surface portion in which at least a portion where the front teeth abut is formed horizontally.

In the twelfth aspect of the present invention, it is preferable that the concave surface or the convex surface of the Monson spherical plate, or both surfaces have a dental arch curve and a memory.

In a thirteenth aspect of the present invention, a concave or convex surface of the Monson spherical plate, or both surfaces thereof, includes an arch reference line forming an axis of symmetry of a dental arch curve, and the memory includes the dental arch. It is preferably formed in a direction that represents the lateral position of the curve.

In the fourteenth aspect of the present invention, it is preferable that the archwire is formed by using the Monson spherical plate and forming an occlusal surface curve corresponding to the dentition arch curve on the archwire.

In the fifteenth aspect of the present invention, the archwire produced by the method for producing an archwire described above contributes to the achievement of the above object.

In the sixteenth aspect of the present invention, with respect to the plane projection shape substantially corresponding to the plane projection shape of the dentition and the curve corresponding to the curve of the occlusal surface, that is, the curve of the occlusal surface (Monson curve) An archwire with a corresponding curvature on the spherical surface of the Monson spherical plate serves the purpose above.

In the seventeenth aspect of the present invention, the material of the archwire may be a shape memory alloy, stainless steel, or any other known material usable for dentistry.

According to an eighteenth aspect of the present invention, the memory has a tangent line of the memory and a tangent line of the dentition arch curve at the intersection with the dentition arch curves of the left and right first molars and the left and right canines. It is also possible to describe so that and are substantially orthogonal.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION On the concave surface of a Monson's spherical plate, an arch chart composed of an upper dentition arch curve, a memory and an arch reference line is drawn. Note that various arch charts (namely, men and women, colored people, white people, and various grades representative of typical occlusal surface curvature) may be prepared.
The concave arch chart is smaller than the convex arch chart.

On the convex surface of the Monson's spherical plate, an arch chart composed of a lower jaw dentition arch curve, a memory and an arch reference line is drawn. Various concave and convex arch charts may be created in advance. That is, it is advisable to prepare various sizes that are different from the average (reference) size.

The part of the Monson spherical plate on which the front teeth come into contact is made flat to be a flat part. The part where the front teeth contact this flat surface is horizontal when the Monson spherical plate is viewed from the front. That is, the front teeth are arranged horizontally, which has an aesthetic effect that the arrangement of the front teeth becomes visually apparent by horizontally aligning the front teeth.

At the bottom of the convex surface, it is preferable to provide a leg portion as a rolling prevention tool for mounting. It should be noted that the function is not limited to these modes as long as it has the same function.

The memory is drawn on the curved front (front) portion of the dentition arch curve and the end portions (open) of the arch curve.

The arch reference line includes at least the axis of symmetry of the arch, and is preferably formed so that the horizontal line of the curved tip of the dentition arch curve and the vertical line of the center of the arch intersect vertically.

An arch wire is created by bending the wire along the arch curve drawn on the Monson spherical plate. As a result, an archwire having a curvature corresponding to the curvature of the occlusal surface (also referred to as Monson curve) is obtained.

The archwire may be preliminarily provided with a curve corresponding to the curve of the occlusal surface (Monson curve) on the spherical surface of the Monson spherical plate.

[0034]

Embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, an arch curve 1 is drawn on the concave surface of the Monson spherical plate in the central portion of the concave surface, and the memory 3,
4 are drawn near the open ends and near the closed (distal) end of arch curve 1, respectively. The arch reference line 5 is drawn at the center of the tip of the arch curve 1 and the median position of both ends of the arch curve 1 to create an arch chart, and the portion 2 of the Monson spherical plate on which the front teeth hit is formed flat.

In FIGS. 3 and 4, the arch curve 8 is drawn on the convex surface of the Monson spherical plate in the central portion of the convex surface, and the memory 1
1 and 12 are drawn near the open ends and near the closed (distal) end of the arch curve 8, respectively. The arch reference line 6 is drawn at a central portion of the distal end of the arch curve 8 as a tangent to the distal end of the arch curve 8 of the arch reference line 5 at a right angle to the arch reference line 5. An arch chart is drawn in FIG. 4, and a portion 7 of the Monson spherical plate corresponding to the front tooth is formed as a flat portion. As shown in FIG. 5, the flat surface portion 7 is designed for the front teeth, and the beveled surface portion 7 is combined with the spherical surface portion.
With a, it spreads out in a substantially horizontal direction. Slope 7
a is formed as a curved triangular slope.

7 and 8, the memories 15, 16 and
23 and 24 are drawn so that the tangent line of the memory and the tangent line of the dentition arch curve at the intersection point are substantially orthogonal to each other at the intersection point with the dentition arch curves 13 and 20 of the left and right first molars and the left and right canines. This makes it possible to accurately know the movement amount and direction of the fixed point on the archwire. In other words, a point on the archwire always moves along the memory as it moves. At this time, the memory may not include the central portion as illustrated.

The legs 9 and 10 are provided between the arch reference line 5 and both sides of the convex arch curve 8 of the Monson spherical plate. Note that the leg portions prevent rolling when the spherical plate is placed, and the shape is not limited to that shown in the figure, and for example, small protrusions may be provided at each vertex of a triangle.

The dentition arches 1 and 8 are curves along the contour of the outer side (cheek side) of the dentition, and as an example thereof, in the projection view seen from the spherical center of the Monson spherical plate, the center of the circle is A parabola whose axis of symmetry passes can be mentioned. Further, the dentition arch curve is curved even on the perspective plane that includes the axis of symmetry and is perpendicular to the projection view (Speech curve).

Even when a Monson curve is attached to the archwire in advance, when the archwire is placed on the dentition arch, the center of the circle is the symmetry axis of the circle in the projection viewed from the spherical center of the Monson spherical plate. An example thereof is one in which a parabola passing through is drawn and which is curved even on a plane that includes the axis of symmetry and is perpendicular to the projected view.

In the projection view of the Monson spherical plate viewed from the center of the sphere, memories 3 and 11 include straight lines connecting the center points of the left and right first molars, and memories 4 and 12 connect the center points of the left and right canines. Including a straight line. The intersection of the contour lines of the plane portions 2 and 7 and the tooth arch curves 1 and 8 corresponds to the center points of the left and right canines.

Tooth arch curves 1, 8, memories 3, 4, 1
As for 1 and 12, the standard size or the size corresponding to individual difference (sex, race, etc.) may be described in advance on the Monson spherical plate. In this case, apply a model of the tooth and select the one with the suitable dimensions. Alternatively, the dental arch curves 1 and 8 and the memories 3, 4, 11 and 12 may be described after the positions of the left and right first molars and the left and right canines are determined by applying the tooth model to the Monson spherical plate. In this case, since it is only necessary to specify the position of the reference tooth, the tooth arch curves 1 and 8 and, depending on the case, the memories 3, 4, and 1.
The numbers 1 and 12 can also be omitted.

As described above, it suffices if the positions of the reference teeth (first molars and canines) can be specified. Therefore, even when the arch chart is written on the Monson spherical plate in advance, the arch reference The lines 5 and 6 can also be omitted and any alternative marking can be applied if desired.

The Monson spherical plate is considered to be a part of a spherical surface having a radius of curvature of about 10 cm (standard dimension) in the course of study, but the occlusal curvature may differ depending on individual differences (sex, race, etc.). It is also possible to create various sizes corresponding to this. Moreover, the material of the Monson spherical plate is made of metal or plastic such as transparent or translucent, which keeps a certain shape, but in case it is necessary to adapt it to the actual occlusal surface due to individual differences, It is also possible to adopt one.

Archwires (including those with a Monson curve) corresponding to the size of Monson's spherical plate (the size of the radius of curvature) can be prepared in various sizes standardized for mass production. it can.

The arch wire includes various cross-sectional shapes such as circular, square and rectangular in cross section as required, and the materials are trade names "true chrome" (stainless steel wire) and trade name "Elgiloy wire". "(Rocky Mountain Morita Co., Ltd.), product name" Waraby ", product name" Azuroy "(Omco Co., Ltd.)
In addition to the above, use shape memory alloys such as product name "Naitai" (nickel / titanium alloy), product name "TMA" (titanium / molybdenum alloy) (above OMCO Co., Ltd.), and other applicable dental products. be able to.
In addition to single wires, twisted wires (multi strand
d), weaved multiple wires into a rectangular cross section (mult
i strand braided rectangular) (for example, trade name "Force 9", Omco Co., Ltd.), spirally wound with multiple wires around the axis, and other various forms applicable to dentistry. including. The use of shape memory alloys eliminates the need for archwire replacement and reduces the number of adjustments.

When a shape memory alloy is used, at least a curve corresponding to the Monson's sphere is stored, and the memory shape can be stored as a first or second (or multi-step) shape. Therefore, for example, the first memorized shape is a shape that substantially corresponds to the projected shape of the dentition, and the second memorized shape is a specific curved shape that corresponds to the curvature of the occlusal surface. It is also possible to store each stage so as to transform into one or both of the projected shape and the different occlusal surface corresponding shapes. In addition, various storage forms and stages are possible.

Regarding the method of shape memory, known means or other suitable means can be used according to the characteristics of the alloy.

On the Monson's spherical plate on which the arch chart is drawn, the models of teeth prepared by the conventional method are stored in the memories 3, 4, 11, 12 in which the left and right first molars and the left and right canines respectively correspond.
It is installed so as to be located at the intersection of the dentition arch curve and the archwire, and the archwire is curved along the Monson's sphere and the contour of the dentition, and the points through which the archwire passes are recorded on the memories 3, 4, 11, 12. As a result, the amount of movement of the archwire to the proper position (target position) due to the passage of time after the installation of the archwire can be confirmed in stages, and as a result, the correction becomes easy. The archwire can be installed on the tooth by, for example, attaching a bracket whose groove angle is adapted to the speed curve to the tooth and inserting the archwire into the bracket. At this time, if the arch wire is previously provided with a curve and a Monson curve corresponding to the contour of the dentition, it becomes easy to determine the passing point (starting point) of the wire on the memory. Furthermore, if the archwire is made of a shape memory alloy, it is not necessary to replace the archwire and the number of adjustments can be reduced.

When the arch chart is not drawn on the Monson's spherical plate in advance, the tooth model prepared by the conventional method is installed on the Monson's spherical plate so that the left and right canines are on the curved line which is the contour of the flat surface. The positions of the canines and the left and right first molars are specified, and the marks indicating these are marked on the Monson's sphere. And the point where the archwire passes in the vicinity is described. The subsequent treatment is the same as the case where the arch chart is drawn in advance.

[0051]

Since the present invention is configured as described above, it has the following effects.

Since each tooth is arranged by attaching a Monson curve to the bent arch wire, the Kristensen phenomenon can be prevented.

When this archwire is used for orthodontics, the teeth are not arranged in a plane, and since the Monson curve is attached, smooth movement of the muscles around the jaw is not disturbed.

Since the teeth are not arranged in a plane, a uniform correction force can be applied to each tooth.

Since the dentition arch on the Monson's spherical plate is provided with a memory to make it uniform in each step, the arch wire can be uniformly bent. With the memory, the interval of the archwire can be set accurately and at other stages by adapting the degree of correction at each stage of correction.

By previously bending the archwire in correspondence with the curvature (Monson curve) of the occlusal surface, it becomes easy to adjust the tooth on the model. Furthermore, by using a shape memory alloy as the material of the archwire, replacement of the archwire becomes unnecessary and the number of adjustments can be reduced.

[Brief description of drawings]

FIG. 1 is a concave perspective view of a Monson's spherical plate showing a dental arch chart.

FIG. 2 is a concave top view of a Monson's spherical plate showing a dental arch chart.

FIG. 3 is a convex perspective view of a Monson's spherical plate showing a dental arch chart.

FIG. 4 is a convex top view of a Monson's spherical plate showing a dental arch chart.

FIG. 5 is a view of a Monson's spherical plate in which a dentition arch chart is drawn, with its convex surface facing downward, as seen from the side surface and the tip of the arch.

FIG. 6 is a view of the dentition arch chart viewed from the side of the arch chart from the side with the convex surface of the Monson spherical plate facing downward.

FIG. 7 is a concave top view of another embodiment of the Monson's spherical plate in which a dentition arch chart is drawn.

FIG. 8 is a convex top view of another embodiment of the Monson's spherical plate in which a dentition arch chart is drawn.

[Explanation of symbols]

1 Upper dentition arch curve 2 The part where the front teeth hit 3 memory 4 memory 5 reference line 6 reference line 7 Front tooth contact area 7a slope part 8 Lower dentition arch curve 9 legs 10 legs 11 memory 12 memories 13 Upper dentition arch curve 14 The part where the front teeth hit 15 memory 16 memory 17 Base line 18 reference line 19 The part where the front teeth hit 20 Lower jaw arch curve 21 legs 22 legs 23 memory 24 memory

Continuation of front page (56) Reference JP-A-2-209458 (JP, A) JP-A-58-50950 (JP, A) JP-A-63-161954 (JP, A) JP-A-5-317336 (JP , A) Japanese Unexamined Patent Publication No. 8-117251 (JP, A) Japanese Unexamined Patent Publication No. 10-295707 (JP, A) U.S.A. 63-46109 (JP, U) US Patent 4079993 (US, A) US Patent 4818226 (US, A) US Patent 5092941 (US, A) US Patent 5137446 (US, A) US Patent 4268250 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61C 7/00 A61C 7/20

Claims (14)

(57) [Claims] 1. A Monson's spherical plate, wherein a dentition arch curve, a memory and an arch reference line used for making an archwire for orthodontic full band treatment are drawn. 2. The concave surface of the Monson's spherical plate has an arch curve of a maxillary dentition arch curve, a memory, and an arch reference line, and a front tooth contact portion has a flat surface portion. Item 1. The Monson spherical plate according to item 1. 3. The convex surface of the Monson's spherical plate has an arch chart of a lower dentition arch curve, a memory, and an arch reference line, and the front tooth contact portion has a flat surface portion. Item 1. The Monson spherical plate according to item 1. 4. A Monson's spherical plate according to claim 3, wherein the Monson's spherical plate is provided with legs at its bottom. 5. The tangent line of the memory and the tangent line of the dentition arch curve at the intersection point are substantially orthogonal to each other at the intersection point with the dentition arch curve of the left and right first molars and the left and right canines. The Monson spherical plate according to claim 1, wherein Wherein said Monson spherical plate include those of various different sizes from those or its radius of curvature reference size, Monson spherical plate according to claim 1, one 5, characterized in that. 7. A partial spherical surface corresponding to the curvature of the occlusal surface of the dentition,
And a Monson spherical plate with a memory for measuring the position of a dental arch curve or archwire drawn or mounted on the spherical surface. 8. further comprising at least flat portion portions horizontally formed parked in the front teeth, and wherein the claim 7
Monson spherical plate described in. 9. Monson spherical plate according to claim 7 or 8 wherein the concave or convex of the Monson spherical plate, or with both surfaces of the teeth arch and a memory, characterized in that. 10. The Monson spherical plate has a concave surface or a convex surface, or both surfaces, and an arch reference line forming an axis of symmetry of a dentition arch curve, the memory including a direction representing a lateral position of the dentition arch curve. The Monson's spherical plate according to claim 9 , wherein the Monson spherical plate is formed as follows. 11. A method for producing an archwire, which comprises using the Monson spherical plate according to any one of claims 1 to 10 and forming an occlusal surface curve corresponding to a dental arch curve on the archwire. 12. An archwire produced by the method for producing an archwire according to claim 11 . 13. An archwire having a plane projection shape substantially corresponding to a plane projection shape of a dentition and a curvature corresponding to a curvature of an occlusal surface of the dentition. 14. The archwire according to claim 12 , wherein the material is a shape memory alloy.