JPH11332886A - Tray for dental impression - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tray for dental impression with a higher density which enables an impression material to stably rest on the tray for dental impression until hardened being pressed onto a tooth or the like while being kept from coming off the tray when removed from the tooth or the like after the impression is transferred. SOLUTION: In a try for dental impression which comprises a tray body 1 to hold an impression material that is pressed onto a tooth or a gum in an oral cavity to transfer a mold thereof and a strip plate-shaped grip part extending backward from the side of the bottom of a side part of the tray body, a concave part 6 is so formed on the top surface of the grip part 2 to make the middle of a thumb fit thereon along it when the grip part 2 extended backward is held to match the direction of the finger with the center line of the grip part 2. Tapered tiny through holes 7 are bored in plurality in the tray body so as to make the inner circumference thereof expand in diameter to the internal surface side of the tray body 1 and other tapered tiny holes in plurality in the tray body so as to make it expand in diameter to the external surface side of the tray body. A long bridge 9 with a small width and a diameter-expanded tapered end part have a circular slit 11 or 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental impression tray for holding an impression material for taking the shape of teeth and gums in the oral cavity.

[0002]

2. Description of the Related Art In dental treatment, in order to manufacture a denture or the like, it is necessary to form the teeth and gums (hereinafter referred to as "teeth etc.") in the oral cavity. To remove the impression material, which is generally viscous and fluid and hardens in a short time, is placed on a dental impression tray, and the dental impression tray is inserted into the oral cavity. Is pressed against the teeth of the upper or lower jaw to capture the impression of the teeth and the like. As the impression material, a material obtained by kneading a powder of alginate (alginate) mixed with water at a predetermined ratio to form a rice cake is mainly used, and other materials such as silicon and agar are also used. As shown in FIG. 10A, a conventional general dental impression tray includes a tray main body 71 for holding an impression material and a grip 72. The tray main body 71 is made of a half-elliptical plate, and the half-ellipse outer peripheral portion 73 is curved upward. In the case of the upper jaw tray, the half-ellipse central portion 74 is formed in a convex shape. Curved, in the case of a lower jaw tray, a half elliptical central portion 74 is cut and removed to provide a relief for the tongue, and a tray that generally corresponds to the shape of the gums and dentition and can hold the impression material Is formed.

A large number of small through holes 76 are formed in the tray body 71, and the impression material after curing is removed from the teeth and the like by the flow of the impression material into the small through holes 76 as shown in FIG. Sometimes, the tray body 71 and the impression material are prevented from peeling off. On the other hand, the grip part 72 is a band-shaped body, and is protruded rearward and horizontally from the bottom of the tray main body 71. The dental impression tray shown in FIG. 10A is for the full jaw and for the upper jaw described above.

[0004] Although not shown, in the case of a dental impression tray for one jaw or anterior teeth, the tray main body 71 is formed in a shape generally corresponding to the target portion, and the grip portion 72 also moves the tray main body 71 to the target portion. It is attached in such a position and direction as to protrude from the mouth when fitted. In the case of a toothed jaw, the tray body 71 is a so-called box type in which the curvature of the tray body 71 is deep, and in the case of an edentulous jaw, the tray body 71 is a so-called round type in which the curvature of the tray body 71 is shallow. Further, instead of the small through hole 76 of the tray body 71, the tray body 71
May be formed in a mesh shape. The conventional dental impression tray is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-4213.

[0005] In order to form a tooth pattern as described above, an impression material is packed in a dental impression tray, the dental impression tray is inserted into the oral cavity, and the impression material on the dental impression tray is placed on teeth. It is necessary to hold the dental impression tray immovably for a predetermined period of time until the impression material hardens, usually 4-5 minutes. However, since the grasping portion 72 of the tray is grasped with one finger, it is liable to sway slightly, and the grasping portion 72 of the conventional tray for dental impression is formed of a simple flat plate. The grip 72 easily slips from side to side, making it difficult to hold the dental impression tray stationary. Therefore, it is difficult to obtain an accurate impression of teeth and gums, and considerable skill is required.

Further, as shown in FIG. 10 (b), the small through-holes 76, which are means for preventing the tray body 71 from peeling off from the impression material, are merely cylindrical as shown in FIG. The hardened impression material is easily removed by being inserted into the tray, and the action of preventing the impression material and the dental impression tray from peeling off when removed from the teeth or the like is relatively weak. Thus, the tray body 7
When the impression material 1 is peeled off from the impression material, the shape of the impression mold is distorted, and plaster is poured to make a tooth model impossible.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and inserts the impression material on the dental impression tray into the oral cavity of a patient and stably presses the impression material on the teeth and the like until the material is hardened. To provide a dental impression tray in which the impression material does not come off the tray when it is removed from the teeth, etc. after taking the impression and applying the appropriate pressure and taking the impression, that is, having high adhesion to the tray. Aim. Furthermore, when the impression is inserted into the oral cavity and the impression is taken, the thumb or index finger holding the holding portion of the dental impression tray does not touch the lips of the patient, and the holding portion has a high hardness. The gripper is not deformed when the whole body is removed from the palate such as the gums, and the tray body is deformable when the sampler taking an impression applies force with forceps etc. according to the size of the patient's gums and palate. That is, an object of the present invention is to provide a dental impression tray having a hardness slightly softer than the grip portion.

[0008]

According to a first aspect of the present invention, there is provided a dental impression tray in which a dental impression tray is pressed against teeth and gums in the oral cavity to copy its mold. In a dental impression tray comprising a tray main body for holding an impression material and a band-shaped grip extending rearward from the bottom of the side of the tray main body, the direction of the finger is set to the midline of the grip extending rearward. A concave portion is formed on the upper surface of the grip portion, along which the belly of the thumb gripped while holding the body is aligned, and the inner periphery is expanded to the inner surface side of the tray main body with a tapered small through hole and the outer surface side of the tray main body A plurality of tapered small through-holes are formed in the tray body.

According to a second aspect of the present invention, in the dental impression tray according to the first aspect of the present invention, the root portion of the grip portion is inclined obliquely to the tray body, and the middle portion of the grip portion has a tip portion. It is curved so as to be horizontal, and a positioning portion for the index finger is formed by the lower surface of the base of the grip portion and the outer surface of the tray body connected to the lower surface of the base.

According to a third aspect of the present invention, in the dental impression tray according to the first aspect of the present invention, the root portion of the holding portion is projected rearward from the tray body.
A concave portion into which the belly of the thumb fits is formed on the middle upper surface of the protruding grip portion, and the front slope on the tray body side of the convex portion on the lower surface of the grip portion corresponding to the concave portion is a contact portion of the index finger. And
The rear slope of the tip of the grip portion of the convex portion is formed at the contact portion of the middle finger, and the tip of the rear slope of the convex portion is further curved in a direction of contacting the middle finger with the middle finger. A gap is provided between the base and the grasped finger.

According to a fourth aspect of the present invention, there is provided a dental impression tray according to any one of the first to third aspects, wherein two 1 cm long cuts are formed at the bottom of the tray body. A narrow bridge is formed for each jaw, which is formed in parallel at a distance from each other, and formed by curving the band between the two cuts outwardly.

A dental impression tray according to a fifth aspect of the present invention is the dental impression tray according to any one of the first to fourth aspects, wherein slits having both ends formed in a large circular shape are formed in the tray body. And the inner peripheral surface of the slit is formed in a tapered shape.

According to a sixth aspect of the present invention, there is provided a dental impression tray according to any one of the first to fifth aspects, wherein the tray is formed of a tin alloy.

[0014] In the tray for dental impression according to claim 7, the tin alloy has a different alloy composition between the tray main body and the gripping portion, and the tray main body is subjected to a strong force of the extractor according to the difference in the shape of the jaw for taking the impression. The grip is hard enough to deform, the grip is harder than the tray body, and when collecting an impression, the tray body is rolled and kneaded, or the impression material is removed from the gum or palate after copying the impression, along with the tray body 7. The dental impression tray according to claim 6, wherein the grip portion gripped at this time has a hardness that does not deform.

The operation of the above means will be described below. According to the dental impression tray of the first aspect, since the concave portion along which the belly of the thumb along the longitudinal direction of the upper surface of the grip portion fits and is formed on the upper surface of the grip portion, the thumb is placed on the upper surface of the grip portion. By holding the dental impression tray firmly so that the belly of the thumb follows the concave portion, the dental impression tray can be easily held in a fixed position. In addition, since the concave portion is formed so that the direction of the finger coincides with the median line of the grip portion, the thumb along the concave portion is aligned with the median line of the U-shaped jaw, so that the tray body is formed. It becomes easy to match with the tooth etc. of the impression object, and handling becomes easy. For this reason, the tray main body is provided so that the median line of the gripping part coincides with the median line of the U-shaped jaw in a state in which the tray main body is aligned with the teeth of the target portion. Further, since the inner peripheral surface of the plurality of small through-holes formed in the dental impression tray is formed in a tapered shape, the contact area with the impression material which has flowed into the small through-hole and hardened increases, and the holding by close contact is performed. Strength can be improved. When the small through-hole has a tapered shape whose diameter increases toward the outer surface, the impression material which has been hardened in a reverse taper shape further engages with the inside of the small through-hole so as not to be pulled out. Therefore, the adhesion between the dental impression tray and the impression material can be dramatically improved. Because we mixed small through-holes with the opposite direction of the taper,
The adhesion between the dental impression tray and the impression material can be maintained for various forces acting on the impression material.

According to the dental impression tray of the second aspect, the index finger holding the grip together with the thumb on the lower surface of the base of the grip which is obliquely inclined and the outer surface of the tray body connected to the lower surface of the root. The index finger on the lower surface side of the grip portion supported by this positioning portion is formed since the index finger positioning portion whose position of the index finger is stably determined by the contact of the back of the finger between the first joint and the second joint of the index finger. And the thumb on the upper surface in accordance with the concave portion allows the dental impression tray to be more stably and firmly gripped, and further facilitates holding the dental impression tray in a fixed position.

According to the dental impression tray according to the third aspect, when the gripping portion is gripped by the thumb and the forefinger or the middle finger,
When the position of the thumb is substantially at the center of the grip portion in the longitudinal direction, this position is reached, and the index finger gripped from the back side of the grip portion is also obliquely below the thumb, so that the tip of the thumb and the first and second joints of the index finger The back of the finger makes a gap from the base of the holding portion of the tray body to hold the holding portion. for that reason,
When inserting the dental impression tray into the patient's mouth to take an impression and copying the impression, the gap between the thumb or index finger holding the grip of the dental impression tray and the finger or the like does not touch the patient's lips. It is sufficiently provided between the tray body side and the patient's lips and the like do not touch the finger of the sampler, so that the patient does not feel discomfort.

According to the dental impression tray according to the fourth aspect, two 1 cm long parallel cuts are formed at the bottom of the tray body with a narrow gap therebetween, and a band between the two cuts is formed. Since a narrow bridge formed by bending outwardly is formed for each jaw, a dent is formed in the bottom of the tray body by the narrow bridge, and the dent is opened outward by two notches. ing. Therefore, the impression material on the tray body flows into the recess of the narrow bridge at the bottom, protrudes outward from the openings on both sides of the narrow bridge in a T-shape, flows out, and hardens. Therefore, the impression material cured in a T-shape outside the dental impression tray acts as a hook, and the adhesion between the dental impression tray and the impression material can be significantly improved. Furthermore, the narrow bridge of the dental impression tray is 1
The T-shaped outflow portion of the impression material to the outside of the tray main body is large and thick unlike the conventional short bridge which can be formed only by a narrow outflow portion because it is formed from a notch of cm length and is relatively large. Since it hardens in width, the adhesion between the dental impression tray and the impression material can be made stronger and more reliable.
For this reason, unlike the conventional bridge having a short length such as many, for example, three, it is sufficient to provide one narrow bridge having a long length of 1 cm according to the present invention on one jaw.

According to the dental impression tray of the fifth aspect, a slit having both ends formed in a large circular shape is formed in the tray body, the inner peripheral surface of the slit is formed in a tapered shape, and the slit is formed outward. Due to the swelling, the impression material easily flows through the slit, and the adhesion after the impression material is cured can be improved. In addition, the fact that the impression material and the tray body after curing are linearly engaged by the slit also contributes to the improvement of the adhesion between the dental impression tray and the impression material. Furthermore, when the impression material placed on the dental impression tray is pressed against the teeth or the like, there is an advantage that excess impression material easily flows from the slit, facilitating the molding operation.

According to the dental impression tray of the present invention, since the dental impression tray is formed of a tin alloy, it has a relatively high thermal conductivity and can respond immediately to the body temperature of the operator.
Does not feel cold when inserted into the mouth. In addition, the dental impression tray requires a predetermined rigidity to obtain an accurate impression, but on the other hand, it is required that the shape of the dental impression tray can be modified and changed according to the difference in the shape of the jaw of the patient. . The tin alloy used for the dental impression tray has such a rigidity that it is not deformed by the stress acting on the dental impression tray during the impression forming operation, but can be deformed when the extractor applies a deforming force with forceps. With rigidity, the shape of the dental impression tray can be changed appropriately according to the difference in jaw shape.

According to the dental impression tray according to the seventh aspect, the finger for gripping the gripping part is located near the center in the longitudinal direction of the gripping part in the dental impression tray according to the third aspect. A portion where only the gripping portion exists exists between the tray main body in front of the finger and the position of the fulcrum caused by gripping the gripping portion with the finger with respect to the tray main body is shifted rearward from the tray main body. Therefore, the gripping part of this part should not be deformed by rolling and kneading the tray body when taking an impression or deforming by the force applied when removing the tray body together with the impression material from the gums and palate after the impression is taken The tin alloy composition of the grip portion is harder than the tin alloy composition of the tray body. On the other hand, the tin alloy composition of the tray body has such a rigidity that it is not deformed by the stress acting on the dental impression tray during the impression forming operation, but it is a rigidity that can be deformed when the extractor applies strong deformation force with forceps, The dental impression tray has a hardness that allows the shape of the dental impression tray to be changed appropriately in accordance with the difference in jaw shape.

[0022]

1 to 9 show several embodiments of the present invention. 1 (a), 1 (b) and 1 (c) are a plan view, a side view and a front view showing a dental impression tray of the first embodiment, and FIG. 2 illustrates a use state of the dental impression tray of FIG. FIGS. 3A and 3B are schematic cross-sectional views illustrating a state in which the impression material has flowed into the small through-holes of the dental impression tray of FIG. 1, and FIGS. (B) and (c) are a back view, a side view, and a front view showing a dental impression tray of the second embodiment, FIG. 5 is a rear view showing a dental impression tray of the third embodiment, and FIG. It is a top view which shows the dental impression tray of a form. (A) and (b) of FIG. 7 are a plan view and a side view showing a dental impression tray of a fifth embodiment,
FIG. 8 is a perspective view illustrating the use state of the dental impression tray of FIG. 7, and FIGS. 9A and 9B are a plan view and a side view illustrating a dental impression tray of a sixth embodiment.

The dental impression tray of each embodiment will be described below in the order of the drawings. The dental impression tray according to the first embodiment shown in FIGS. 1A to 1C is for an upper jaw and a toothed full jaw. The dental impression tray comprises a tray body 1 for holding an impression material and a gripper 2 for gripping by hand. This tray main body 1 is a half-elliptical plate body like the conventional dental impression tray of FIG. 7, the elliptical outer peripheral portion 3 is curved upward, and the elliptical central portion 4 is convex upward. To a shape generally corresponding to the upper jaw. Therefore, the oval central part 4 of the tray main body 1 is along the palate, and the dentition and the gum can be inserted into the groove between the elliptical central part 4 and the elliptical outer peripheral part 3,
That is, the entire upper surface of the tray main body 1 was formed so as to follow the shape of the upper jaw. Since this dental impression tray is for teeth, the arc-shaped groove 5 is relatively deep, and is a so-called box type.

The grip portion 2 is a band-shaped body, and is provided substantially horizontally from the rear bottom of the tray body 1 along the midline. More specifically, the base of the gripping portion 2 is projected slightly inclined downward from the tray main body 1, and is curved concavely near the base so that the tip is horizontal. In addition, the grip portion 2 was also curved concavely in the width direction of the band-shaped body, and the curvature was increased near the base. As a result, a concave portion 6 was formed near the base of the upper surface of the grip portion 2, and the belly of the thumb having the shape of the concave portion 6 aligned with the midline of the grip portion 2 was fitted. Further, the index finger positioning portion 5 was formed by the outer surface of the tray body 1 adjacent to the lower surface of the base portion of the grip portion 2. Therefore, when gripping and handling the grip portion 2 of the dental impression tray, as shown in FIG. 2, the abdomen of the thumb is aligned with the concave portion 6 on the upper surface of the grip portion 2 and the index finger is positioned on the positioning portion 5 on the lower surface of the grip portion 2. By holding the dental impression tray from above and below, the dental impression tray can be firmly and stably gripped, and the deviation to the left and right can be reduced. Therefore, an accurate impression can be obtained. In addition, since the concave portion 6 is located on the median line of the tray main body 1, the tray main body 1 is inserted into the oral cavity at the time of tooth shaping, and the thumb along the concave portion 6 coincides with the median line of the upper jaw. The midline of the main body 1 and the midline of the upper jaw substantially match, and positioning is facilitated.

A large number of small through holes 7 are formed in the tray body 1. As shown in FIGS. 3A and 3B, the small through hole 7 has an inner peripheral surface formed in a tapered shape. The tapered shape in the present invention means that the diameter of the inner peripheral surface is uniformly increased as shown in FIGS. 3A and 3B and that the tapered shape is as shown in FIGS. 3C and 3D. In this case, the diameter of the inner peripheral surface initially increases uniformly, but the diameter suddenly increases so as to be depressed halfway. In the case of the small through-hole 7a whose diameter is increased in the outer surface direction as shown in FIG. 3A, the impression material 8 which has flowed into the small through-hole 7a and hardened has a dovetail shape having a reverse taper with the small through-hole 7a. Engage,
The peeling of the tray body 1 and the impression material 8 can be prevented. On the other hand, in the case of the small through hole 7b whose diameter increases in the inner surface direction as shown in FIG. 3B, the impression material 8 like the small through hole 7a in FIG.
There is no dovetail-like engagement with the impression material 8, but the contact area with the impression material 8 is larger than that of the conventional small through hole 76 as shown in FIG. As shown in FIGS. 3 (c) and 3 (d), by increasing the diameter in a tapered and concave shape, the adhesion of the impression material 8 is further increased. The small through-hole 7 of the dental impression tray has a mixture of a small through-hole 7a expanded in the outer surface direction and a small through-hole 7b expanded in the inner surface direction. Can be maintained.

A pair of narrow bridges 9 are formed at symmetrical positions on the bottom of the tray body 1. This narrow bridge 9
Is a structure in which two parallel cuts are formed in the tray body 1 and the band between the cuts is curved outward. Therefore, relatively large crescent-shaped openings 10 are opened on both sides of the narrow bridge 9 in a direction substantially parallel to the tray main body 1 in the vicinity thereof. Therefore, when the impression material is placed on the tray body 1, the impression material flows into the concave portion of the narrow bridge 9, and forms a T-shape along the outer surface of the tray body 1 from the openings 10 on both sides of the narrow bridge 9. Spills and hardens. Thus, the T-shaped impression material hardened on the outer surface of the tray body 1 functions like a hook, and the adhesion between the tray body 1 and the impression material is improved. In addition, since the length of the narrow bridge 9 is set to about 1 cm, the opening 10 is large and the impression material easily flows out. Therefore, the T-shaped impression material that has flowed and hardened to the outer surface of the tray body 1 as described above is sufficiently large, and sufficient adhesion between the tray body 1 and the impression material can be obtained.

Further, a slit 11 having a predetermined length was formed in the center of the tray body 1, and both ends 12 of the slit 11 were formed in a large circle. The inner peripheral surface of the slit 11 was formed in a tapered shape whose diameter increased toward the outer surface. Further, a pair of slits 13 are formed in the left and right symmetric positions from the center of the elliptical outer peripheral portion 3 of the tray body 1.
4 was also formed in a large circle. However, the inner peripheral surface of the slit 13 was formed in a tapered shape whose diameter increased toward the inner surface side. The slit 11 and the slit 13 allow the impression material placed on the tray body 1 to flow easily, and the hardened impression material, the tray body 1 and the engagement portion are linearly long, so that a large adhesion force is exhibited. Can be.

As described above, the dental impression tray has a small through hole 7, a narrow bridge 9, and slits 11, 13 provided in the tray body 1 to improve the adhesion between the cured impression material and the tray body 1. Dramatically improved, facilitating the molding work. In addition, the concave portion 6 provided on the upper surface of the grip portion 2 and the index finger positioning portion 5 provided on the lower surface enable firm holding of the dental impression tray, thereby improving the accuracy of molding. .

The dental impression tray according to the second embodiment shown in FIGS. 4A to 4C is for a lower jaw and a toothed full jaw. Like the dental impression tray of the first embodiment (see FIG. 1), the dental impression tray has a structure in which a grip portion 22 is received in a half-elliptical tray body 21, but is used for the lower jaw. The dental impression tray of the first embodiment is shaped upside down and the tray body 21 is turned down. Also, a half-elliptical cutout 24 is formed in front of the tray body 21 in the same manner as the conventional dental impression tray for a lower jaw. The grip portion 22 is a grip portion 2 of the first embodiment.
In the same manner as described above, a concave portion 25 protruding substantially horizontally along the midline from the rear portion of the tray body 21 and having a shape along the belly of the thumb on the upper surface.
And a positioning portion 23 for the index finger is formed on the lower surface so that it can be firmly gripped. The tray body 21 of the dental impression tray for the lower jaw is also provided with a small through hole 26, a narrow bridge 27 and slits 28 and 29 similarly to the dental impression tray of the first embodiment, and the impression material after hardening. And the tray body 1 are promoted in close contact with each other.

The dental impression tray according to the third embodiment shown in FIG. 5 is for a lower jaw and an edentulous full jaw. The dental impression tray is the same as the dental impression tray of the second embodiment, and comprises a tray body 31 lying down and a grip portion 32 projecting substantially horizontally from the rear of the tray body 31. Since the dental impression tray is for the lower jaw, the front central portion of the tray main body 31 is cut into an elliptical half-shape like the dental impression tray of the second embodiment. In addition, since the tray main body 31 is shallow, so-called round type because it is used for edentulous jaws. The grip portion 32 also has a concave portion 33 similar to that of the dental impression tray on the upper surface and a positioning portion for the index finger on the lower surface to enable firm grip. In the tray body 31, three small through holes 34 each having a tapered inner peripheral surface are formed at the left, right, and center of the bottom, respectively, such as the dental impression trays of the first and second embodiments. Neither narrow bridges 9 and 27 nor slits 12 and 28 are provided.
This is because the dental impression tray is toothless, so that the cured impression material is easily separated from the jaw and the adhesion between the impression material and the dental impression tray is not so required. This is because the adhesion by the holes 34 is sufficient. Although not shown, in the case of an edentulous full jaw and an upper jaw, the dental impression tray has a shape that is inverted upside down, and has a convex curved shape without cutting the front of the tray body 31. I do.

The dental impression tray of the fourth embodiment shown in FIG. 6 is for a single jaw, and is used for molding the right side of the lower jaw and the left side of the upper jaw. The dental impression tray is J
The tray body 41 is formed in the shape of a letter, and a gripping portion 42 protruding horizontally from the lower end of the J-shape of the tray body 41. Therefore, the dental impression tray is gripped so that the tray body 41 faces downward when used for molding the right side of the lower jaw, and so that the tray body 41 faces upward when used for molding the left side of the upper jaw. Hold. At the bottom of the tray body 41, narrow bridges 44 and small through holes 43 similar to the narrow bridges 9, 27 and small through holes 7, 26 of the dental impression trays of the first and second embodiments are provided. But the slit 1
2, 28 are not provided. This is because the dental impression tray is for a single jaw, so that it is easier to remove from the jaw than for a full jaw, and the adhesion required to prevent the separation of the tray body 41 from the impression material is a narrow bridge. 44 and the small through-hole 43 can be sufficiently obtained. Further, on the upper surface and the lower surface of the grip portion 42, a concave portion 45 similar to the above-mentioned dental impression tray is formed, and in either case of molding the right side of the lower jaw or the left side of the upper jaw, the gripped thumb and the concave portion 45 are formed. Are fitted. In the case of the dental impression tray for the lower left side and the upper right side, the shape is such that the dental impression tray is turned left and right.

The dental impression tray according to the fifth embodiment shown in FIGS. 7A and 7B is the same as the dental impression tray according to the first embodiment of FIG. Things. The difference between the two is the shape of the grip. Therefore, the description of the tray body will be omitted by referring to the description relating to the first embodiment. The dental impression tray includes a tray body 1 for holding an impression material and a gripper 52 for gripping by hand.

The grip portion 52 is a strip-shaped body, and is provided substantially obliquely from the rear bottom of the tray body 1 along the midline.
More specifically, the root portion 58 of the grip portion 52 projects slightly inclining downward from the tray main body 1, and the concave portion 53 for fitting the belly of the thumb approximately in the middle between the root portion 58 and the tip end 59 of the grip portion 52. To form The shape of the concave portion 53 is aligned with the median line of the grip portion 52 so that the belly of the thumb fits and abuts. The concave portion 53 is formed deeply so that the belly of the thumb is sufficiently fitted and abutted. By forming the deep concave portion, a sufficient force can be exerted even when the dental impression tray is rolled left and right and kneaded when collecting impressions. A sufficient space 54 is provided between the concave portion 53 of the grip portion 52 and the root portion 58 of the tray body 1. A convex portion 55 corresponding to the concave portion 53 is provided at the center of the back side of the grip portion 52.
Are formed. Of the slopes forming the convex portion 55,
The slope on the base portion 58 side of the grip portion 52 is a front slope 58, the slope on the tip 59 side of the grip portion 52 is a rear slope 57, and the forefinger when gripping the grip portion 52 abuts on the front slope 56, The rear slope 57 is a surface with which the middle finger contacts the grip portion 52 when gripping the grip portion 52, and the distal end side of the grip portion is further curved to the side enclosing the middle finger at the tail portion 60 of the rear slope 57. Further, the form of the tray of the tray body 1 can be slightly changed. That is, the portion surrounded by the circle of the rear side end 61 of the tray main body is slightly inclined to the inside of the tray main body 1. In this way, the impression material bites into the tray body more strongly,
It is possible to prevent the tray main body 1 from coming off the impression material when the tray main body 1 after the molding is removed from the palate together with the impression material.

When the gripping portion 52 of the dental impression tray is gripped and handled by forming the gripping portion 52 as described above, the concave portion 53 on the upper surface of the gripping portion 52 as shown in FIG. The belly of the thumb is fitted, the forefinger is fitted to the front slope 56 of the convex part 55 on the lower surface of the grip part 52, and the convex part 5
Positioning can be performed by aligning the middle finger with the rear slope 57 of the fifth gripper 5 and gripping it from above and below, so that the dental impression tray can be firmly and stably gripped, and the lateral deflection can be reduced. Then, a sufficient gap 54 is formed between the tip of the thumb or the back of the index finger holding the holding portion 52 and the rear side of the tray body 1. For example, the interval 54
Is an interval at which the lips of the patient taking the impression do not touch the finger holding the grip 52. With the configuration of the present embodiment, an accurate impression can be obtained. Also, the concave portion 53
Is positioned on the median line of the tray body 1, the tray body 1 is inserted into the oral cavity at the time of tooth shaping, and the thumb along the concave portion 53 is made to coincide with the median line of the upper jaw. And the midline of the upper jaw substantially coincide with each other, which facilitates positioning, as in the first embodiment.

The dental impression tray according to the sixth embodiment shown in FIGS. 9A and 9B is for a lower jaw and a full toothed jaw, and is a tray body of the dental impression tray according to the sixth embodiment. Is substantially the same as the tray body of the dental impression tray of the second embodiment, and the tray body is referred to the description of FIG. The difference between the two dental impression trays lies in a gripping portion 52 that grips the tray body 21 substantially. By the way, since the dental impression tray is for the lower jaw, the dental impression tray of the first embodiment is shaped upside down,
The tray body 21 is turned down. Gripper 52
Is located at a position corresponding to the concave portion 53 on the rear surface of the grip portion 52 by projecting slightly obliquely from the rear of the tray body 21 along the midline, forming a concave portion 53 along the belly of the thumb on the upper surface. A front slope 56 on the tray body 21 side of the projection 53 is used as a positioning part for the index finger, and a rear slope 57 on the tip 59 side of the projection 53 is used as a positioning part for the middle finger, From this portion, the portion of the grip portion 52 at the tip is further curved in the direction of wrapping the middle finger. Since formed in this way, a sufficient space 54 is formed between the tip of the thumb or the back of the index finger holding the holding portion 52 and the root portion 58 on the rear side of the tray body 21 as in the fifth embodiment. . For example,
The interval 54 is set so that the lips of the patient who takes the impression do not touch the finger holding the grip 52.

The dental impression trays of the first to fourth embodiments were all formed of a tin alloy in which about 90% of tin was mixed with antimony and copper. Since this tin alloy has a relatively high thermal conductivity, it immediately responds to the body temperature of the operator during handling and does not feel cold when inserted into the oral cavity. In addition, since the tin alloy has high rigidity and cannot be easily deformed, the deformation of an impression which tends to occur when the tin alloy is removed from the chin is prevented. Furthermore, if tools such as forceps are used, deformation is possible, and the shape of the dental impression tray can be changed according to the difference in the shape of the jaw.

In the dental impression tray 1 of the fifth embodiment and the dental impression tray 21 of the sixth embodiment, the position of the finger holding each holding portion 52 is located at the center of the holding portion 52 in the longitudinal direction. Since there is a gap 54 between the root 58 of the tray body and the position of this finger, the strength of the grip 52 at this interval 54 is such that when the impression is taken, the grip is gripped with a finger and rolling is performed. It is necessary to withstand the force when kneading and kneading and when removing both the impression material and the tray body from the palate. Therefore, the tin alloy composition of the grip portion 52 is set to be harder than the tin alloy composition of the tray body that can be deformed by using the above-mentioned tools such as forceps. For example, as a first example of a tin alloy, in the following weight%, the tray body is composed of Sn: 97.8%, Sb: 1%,
Bi: 1%, Te: 0.2%, and the grip portion is Sn: 9
2.8%, Sb: 4%, Bi: 3%, Te: 0.2%. As a second embodiment, the tray body is Sn: 9.
7.7%, Sb: 2%, Te: 0.3%
Sn: 91.7%, Sb: 4%, Bi: 4%, Te:
0.3%. Then, the tray main body and the grip portion having different tin alloy compositions are connected to each other by casting and manufactured.

Although the embodiment has been described above, the implementation of the dental impression tray according to the present invention is not limited to this. For example, the tapered small through-holes, narrow bridges and tapered slits provided in the tray body allow the impression material to separate from the tray body in consideration of the condition and size of the dental impression tray to be used. Instead, it may be appropriately arranged so as to provide such an adhesive property that the impression material can be removed from the chin. The acute end of the tapered small through hole or the slit that widens to one side may have rounded corners so as not to cut the inflow-hardened impression material.

[0039]

As described above, according to the present invention, the holding portion can be firmly gripped by the concave portion, and the dental impression tray can be easily held in a fixed position. The material can be stably stopped in a state where the material is pressed against the teeth or the like, and the mold can be accurately molded. In addition, the tapered inner peripheral surface of the small through hole increases the contact area with the impression material, improves the adhesion, and further swells and hardens out of the tapered hole, so that the hardened impression material does not pull out. As a result, the adhesion between the dental impression tray and the impression material is dramatically improved. The shape of the gripping portion is such that the gripping fingers are exactly along the shape, so that it can be firmly gripped, so that the impression can be taken stably and accurately, without skill. The impression material flows outward from the large narrow bridge in a T-shape and hardens, and the cured impression material is caught by the bridge, so that the adhesion between the dental impression tray and the impression material is large. Therefore, the detachment of the impression material and the dental impression tray can be further prevented when the tooth impression is removed from the teeth,
The accuracy of molding a tooth model such as gypsum increases. Furthermore, since the slit is formed in the tray main body, the impression material easily flows out, and the adhesion can be further improved. In addition, since the tin alloy is used as the material, the cooling sensation at the time of contact is reduced due to the relatively high thermal conductivity of the tin alloy, and it can be deformed despite its relatively high rigidity. It can be deformed with forceps or the like according to the shape of the jaw, and the effects of the present invention can be further enhanced.

Further, in the gripping part of the dental impression tray, the gripping part of the finger gripping the gripping part is located in the middle of the gripping part in the longitudinal direction and there is an interval between the tray body and the gripping finger. Since the lips of the patient collecting the impression at this interval do not come into contact with the finger of the sampler, they do not cause discomfort to the patient, and the depth of the concave portion for fitting the thumb is deep enough. Also, when the impression is taken, the force of the finger can be sufficiently transmitted when the tray body is kneaded by rolling. Further, in this dental impression tray, the strength of the grip portion is set to a hardness enough to withstand the above-described rolling.
Therefore, the feeling of wearing when grasping the gripping portion is good and fits perfectly to the hand, and the impression can be more efficiently collected. Moreover, by changing the strength of the tin alloy of the gripping part and the tray body by casting, the tray body can be easily deformed by the impression sampler with forceps etc. according to the shape of the patient's jaw and gums, and the applicable range is What is extremely broad is the same as the other inventions of the present application.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) are a plan view, a side view and a front view showing a dental impression tray according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a use state of the dental impression tray of FIG. 1;

FIG. 3 (a) and (b) and (c) and (d)
FIG. 2 is a schematic cross-sectional view illustrating a state where an impression material has flowed into a small through-hole of the dental impression tray of FIG. 1.

FIGS. 4 (a), (b) and (c) are a rear view, a side view and a front view showing a dental impression tray of a second embodiment.

FIG. 5 is a rear view showing a dental impression tray according to a third embodiment.

FIG. 6 is a plan view showing a dental impression tray according to a fourth embodiment.

FIGS. 7A and 7B are a plan view and a side view showing a dental impression tray according to the first embodiment of the present invention.

FIG. 8 is a perspective view illustrating a use state of the dental impression tray of FIG. 7;

FIGS. 9A and 9B are a rear view and a side view showing a dental impression tray of a sixth embodiment.

10A is a perspective view showing a conventional dental impression tray, and FIG. 10B is a schematic cross-sectional view illustrating a state in which an impression material flows into a small through hole of the dental impression tray of FIG. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tray main body 2 Grasping part 3 Elliptical peripheral part 4 Elliptical central part 5 Positioning part 6 Concave part 7 Small through-hole 7a Small through-hole which expanded toward the outer surface 7b Small through-hole which expanded toward the inner surface 8 Impression material 9 Narrow width Bridge 10 Crescent-shaped opening 11 Slit 13 Slit 14 Both ends 21 Tray body 22 Gripping part 23 Positioning part 25 Concave part 26 Small through hole 27 Narrow bridge 28 Slit 29 Slit 31 Tray body 32 Gripping part 33 Concave part 34 Inner circumference Small through-hole 41 with tapered surface 41 Tray body 42 Gripping part 43 Small through-hole 44 Narrow bridge 45 Concave part 52 Gripping part 53 Concave part 54 Gap 55 Convex part 56 Front slope 57 Rear slope 58 Root part 59 Tip 61 Tray Rear end of main body 71 Tray main body 72 Gripping part 73 Outer periphery of half ellipse 74 Central part of half ellipse 75 Small penetration Hole

Claims (7)

[Claims] 1. A tray body for holding an impression material for pressing the teeth and gums in the oral cavity to copy the mold, and a strip-shaped grip portion extending rearward from the bottom of the side of the tray body. In the dental impression tray, a concave portion is formed on the upper surface of the gripping portion along which the belly of the grasped thumb placed with the direction of the finger aligned with the midline of the gripping portion extending rearward is formed on the upper surface of the gripping portion, and the inner peripheral surface is formed. Dental wherein a plurality of small tapered through holes which increase in diameter in the inner surface direction of the tray body and a plurality of small taper through holes whose inner peripheral surface expands in the outer surface direction of the tray body are provided in the tray body. Impression tray. 2. The dental impression tray according to claim 1, wherein a root of the grip is inclined obliquely to the tray body, and an intermediate portion of the grip is curved so that the tip is horizontal, and the root of the grip is provided. A dental impression tray, wherein an index finger positioning portion is formed by a lower surface of the part and an outer surface of the tray body connected to the lower surface of the root part. 3. The dental impression tray according to claim 1, wherein a root portion of the holding portion projects rearward from the tray main body,
A concave portion into which the belly of the thumb fits is formed on the middle upper surface of the protruding grip portion, and the front slope on the tray body side of the convex portion on the lower surface of the grip portion corresponding to the concave portion is a contact portion of the index finger. And
The rear slope of the tip of the grip portion of the convex portion is formed at the contact portion of the middle finger, and the tip of the rear slope of the convex portion is further curved in a direction of contacting the middle finger with the middle finger. A dental impression tray, wherein a gap is provided between a base and a grasped finger. 4. The dental impression tray according to any one of claims 1 to 3, wherein two 1 cm long cuts are formed side by side in the bottom of the tray main body with a narrow gap therebetween. A dental impression tray, characterized in that a narrow bridge formed by curving a band between cuts of a strip outwardly is provided for each jaw. 5. The dental impression tray according to claim 1, wherein a slit having both ends formed in a large circle is formed in the tray main body, and an inner peripheral surface of the slit is formed. A dental impression tray formed in a tapered shape and bulging outward. 6. A dental impression tray according to claim 1, wherein the dental impression tray is formed of a tin alloy. 7. The tin alloy has a different alloy composition between the tray body and the grip portion, and the tray body has a hardness sufficient to be deformable by a strong force of a sampler in accordance with a difference in the shape of a jaw for taking an impression. The part is harder than the tray body and has a hardness that does not deform the gripper that is gripped when kneading by rolling the tray body at the time of impression collection or removing the impression material from the gums and palate together with the tray body after copying the impression The dental impression tray according to claim 6, wherein the tray is provided.