JPH0586309U - Dowel pin with sleeve - Google Patents

Abstract

(57) [Summary] [Purpose] The reference surface is not damaged even if it is attached and detached several times for shape adjustment, and it can be easily reattached in its original position. Also, the adhesive does not stick out when the dowel pin is planted. The dowel pin with sleeve that can handle the above and is easy to handle with the hand of the dowel pin. [Structure] A dowel pin with a sleeve in which a dowel pin has a conical shape with an oval cross section, a sleeve having a height lower than that of the dowel pin is engaged with the periphery thereof, and a grip portion is formed at a lower end of the dowel pin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dowel pin for implanting an abutment tooth so that the abutment tooth can be easily attached / detached from a tooth model.

[0002]

[Prior Art]

 To make a removable dental model, a dental technician used a dental technician to trim the opposite side of the tooth tip to form a reference surface, and the bottom surface of this reference surface. Place the dowel pins in parallel holes drilled with a pin drill or pin planting machine with glue, resin, or plaster, and then remove the raised resin or plaster on the reference surface with a knife, and Grooves etc. are formed on the bottom surface of the reference surface so that the reattachment position can be specified, and then the gypsum separating agent is applied to the reference surface and the dowel pin, and then the secondary gypsum is poured into the rubber mold and the dowel pin Embed the part and mold it. Then, only the abutment tooth to be manufactured is divided from the tooth model.

[0003]

[Problems to be solved by the device]

 With the conventional method, if there is a mistake in planting the dowel pin and there is a gap between the dowel pin and the reference plane of the model, either fill the gap or pull out the dowel pin with pliers and drill with a drill or pin planter. Since it re-digs, it takes time and effort to reset the pins. In addition, the reference surface may be destroyed when the dowel pin is pulled out. Furthermore, since the abutment tooth is removed and attached from the model ten or more times in order to correct the shape of the abutment tooth during the work, the hole diameter may be widened and the abutment tooth may become loose and may not be able to stand upright.

Moreover, if the cross section of the dowel pin is circular, it is easy to rotate, and it is difficult to reattach it to the original position. Further, in the case of a commercially available sleeveless dowel pin, the abutment teeth are easily rotated because the area of the base of the primary plaster such as the lower jaw cannot be secured.

[0005]

Means for Solving the Problems The present invention provides a dowel pin having an oval cross section for preventing rotation, and a tubular sleeve is engaged with the dowel pin to correct the shape of an abutment tooth. The dowel pin can be easily attached and detached, and the hole diameter can be prevented from being damaged.

In addition, by making the height of the sleeve lower than the height of the reference surface of the dowel pin and making it shorter, a pool for the adhesive that overflows when the dowel pin is planted is produced. Has been done. Further, when implanting a dowel pin on an abutment tooth, it is difficult to grasp the round and thin tip to determine the direction of the implant, but the present invention makes both sides of the tip of the dowel pin a flat surface. Formed so that it is easy to see.

[0007]

【Example】

 Next, an explanation will be given according to an embodiment shown in the drawings.

The dowel pin 1 has an oval cross-sectional shape formed by attaching a small diameter circle b to the side surface of a large diameter circle a of a well-known circular cross section and connecting both circles with a circumscribed line. The overall shape is a cone with a wide upper cross section and a narrow lower cross section.

A cylindrical sleeve 2 having an inner surface of the same cross-sectional contour shape is engaged with the peripheral surface of the dowel pin 1, and its length is shorter at the upper and lower parts than the dowel pin 1. At the lower end, a locking step 3 for reinforcing the fixing at the time of secondary gypsum is laterally projected at the lower end if necessary. Although the locking step 3 is shown as protruding only on both side surfaces in the major axis direction in the embodiment, it may be formed in any direction or on the entire circumferential surface.

Both sides of the lower end of the dowel pin 1 exposed from the sleeve 2 in the major axis direction are cut flat to form a grip portion 4. On the upper part of the dowel pin 1, a screw portion 5 is projected on the axis of the large diameter circle.

Further, a concave groove 6 for preventing rotation is formed on the upper side surface of the dowel pin 1, and a convex rib 7 is provided on the inner surface position of the sleeve 2 corresponding to the concave groove 6 to prevent the rotation. And the convex rib 7 are engaged with each other. The convex ribs also serve as a reinforcement.

In the present embodiment, the sleeve 2 is engaged with the dowel pin as a separate body, but the same shape as the sleeve formed integrally with the dowel pin by bulging the center of the body of the dowel pin 1 The same effect can be achieved even with the above configuration.

[0013]

[Effect of the device]

 According to the dowel pin with a sleeve of the present invention, even if the abutment tooth is attached to and detached from the model 10 times or more for assembling and shape correction, the hole is not wobbled because it is protected by the sleeve. The dowel pin does not rotate because it has an egg-shaped cross section and the convex rib 7 for preventing rotation is present, and the dowel pin can be easily reattached to the original position. Further, the locking step 3 is provided on the sleeve 2 to prevent the secondary gypsum from being fixed and prevented from falling off and reinforced. Furthermore, when the dowel pin is planted and reattached, the dowel pin can be held with a flat grip portion, which is easy to handle.

Further, since the shape is oval, by locating the small diameter portion inside the oropharynx, the saw tooth can be cut without hitting the dowel pin when the dental model is divided.

Furthermore, since the height of the sleeve is set lower than the reference surface of the dowel pin, the protruding portion of the adhesive at the time of planting is formed on the upper part of the sleeve and the upper side surface of the dowel pin. Since it will be pulled into space, there is no need for the sleeve to be slid and the protruding portion to be scraped off with a knife as in the past. Since the dowel pin has a conical shape, engaging the sleeve with the upper part left does not make the sleeve wider than the maximum width of the upper part of the dowel pin, so when dividing the abutment tooth with a saw. The saw does not hit the sleeve.

[Brief description of drawings]

FIG. 1 is a front view showing the sleeve without the front surface.

2 is a plan view

[Figure 3] Bottom view

[Explanation of symbols]

 1 Dowel pin 2 Sleeve 3 Locking step 4 Grip part 5 Screw part 6 Recessed groove 7 Convex rib

Claims (5)

[Scope of utility model registration request] 1. A conical shape having an oval cross-section and having a small diameter toward the lower end, a threaded portion protruding above the same axis of the large diameter portion, and having the same shape on the peripheral surface of the conical portion. The sleeve consisting of a cylinder is engaged, and this sleeve is
A dowel pin with a sleeve having a short length such that the upper and lower ends of the conical portion are exposed. 2. The sleeve according to claim 1, wherein a grip portion is formed in which both side surfaces of the lower end of the conical portion in the major axis direction are flat surfaces.
Dowel pin with knob. 3. The dowel pin with a sleeve according to claim 1, wherein at least both side surfaces of the lower end of the sleeve in the major axis direction are projected to form a locking step. 4. The dowel pin with sleeve according to claim 1, wherein the dowel pin has at least one concave groove on a side surface thereof, and the inner surface of the sleeve has a rotation preventing structure provided with a corresponding convex rib. 5. A dowel pin formed by bulging a body part of the dowel pin in the same shape as that of the dowel pin with a sleeve according to claim 1.