JPH0288053A - Artificial dental root - Google Patents

Abstract

PURPOSE:To facilitate operation to fill an artificial dental root in an alveoli bone and perform rapid setting of a filling part by a method wherein a filling part and a head part are divided from each other and engaged with each other and situated in a manner to couple with each other, an engaging coupling part is formed in a taper shape, and the head part is inserted in the filling part for fixing. CONSTITUTION:A filling part 1 is formed in a flat shape, a number of holes 1a are formed in a flat surface, and an engaging protrusion part 1b in a taper narrowed toward above is formed on the one side of a central part. A head part 2 is provided with a tapered engaging recessed part 2a spread toward a lower end. When the head part 2 is inserted in the filling part 1 from above, the engaging recessed part 2a of the head part is engaged in a manner to fasten the engaging protrusion and recessed part 1b, and the two tapered engaging parts are firmly fixed without loosening. The filling part 1 and the head part 2 are divided from each other and both formed by a Ti material or a Ti alloy material, and a fine groove is formed in an alveoli bone by operation, and the flat filling part 1 is filled therein. During filling, the engaging recessed part 1b formed in the filling part is filled with resin to prevent blocking of a hole. In the filled filling part 1, rapid reproduction of a bone is effected through the holes 1a, and holding ability is improved for securing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the improvement of an artificial tooth root (implant) that is implanted into the oral bone and serves as an abutment for a denture.

[Prior art]

In recent years, oral implantation surgery has been performed in which artificial teeth are permanently attached to replace extracted teeth, and improvements have been made to practical implanted structures, ie, implants. As shown in Fig. 1, the conventional implant has an implant part 1 that is implanted into the alveolar bone, a head part 2 that is exposed in the oral cavity and serves as an abutment for the denture, and the head part 2 is connected to the implant part 1. cervical region 3
It is composed of 1a is the diameter 1 formed in the implanted part.
Make a hole with a diameter of ~3 mm to ensure a good bone attachment. Note that there are cases where the neck 3 is not narrowed and the head 2 is connected to the implant 1 in a straight manner. The implant has an implant portion 1, a head portion 2, and a neck portion 3 that are integrally made of a corrosion-resistant material such as li or Ti alloy. It is a single metal structure that is cast, forged, sintered, or injection molded, or that the implantation part and head are divided into parts, processed and formed, and then welded together to form a single body.

(Problem) Conventionally, with such a single-structure implant, it is necessary to perform a surgery to implant the implant part 1 into the alveolar bone with the head attached, so the exact position must be carefully determined before implantation. It required skill. In addition, there is a drawback that the implanted part loosens or moves before it takes root in the bone, resulting in poor stability.

[Means for solving problems]

The present invention has been proposed in order to eliminate such conventional drawbacks, and the implant part and the head part of the implant are divided and provided so as to fit and connect with each other, and the fitting connection is It is characterized by having a tapered section so that the head can be inserted and fixed into the implanted section.

[Effect]

In the present invention, since the implantation part and the head part have a separate structure, processing and molding is easy and precision parts can be manufactured. In addition, during surgery, implantation is easy, and since the head is fitted and connected from behind to the implanted part embedded in the alveolar bone, the implanted part can be fully rooted in the bone, preventing loosening or movement. It is possible to improve retention without causing any damage.

Furthermore, since the fitting portion is tapered so that the head is inserted into the implanted portion and connected, the fitting portion is reliably strong and stable holding force can be obtained without loosening.

(Example] The present invention will be explained below with reference to an embodiment of the drawings.

In Fig. 2, (a) shows the head 2, and (b) shows the implanted part 1.
(C) shows the top surface of the implanted part 1. (b)
As shown in the figure and (C), the implantation part 1 has a flat shape and has a large number of holes 1a on the flat surface, and a tapered fitting uneven part 1b is formed on one side of the central part. It is. The head 2 has a tapered fitting recess 2a with a widened bottom end as shown in the figure (a). When the head 2 is inserted into the implant 1 from above, the fitting recess 2a of the head will fit into the implant. The fitting convex portions 1b of the two are tightly fitted, and the tapered fitting portions of both are firmly fixed without loosening. The implant part 1 and the head part 2 are each formed separately from Ti material and Ti alloy material,
The flat implant portion 1 is surgically implanted into the alveolar bone by cutting a thin groove therein.

In addition, when implanting, the fitting recess 1b formed in the implantation part is filled with resin or the like to prevent the hole from being blocked.

Bone regeneration is rapidly performed in the implanted part 1 through the hole 1a, and the bone is fixed with improved retention.

When the head 2 is embedded and fitted into the implanted portion 1, the two are tapered and firmly fixed together. The resin filled in the fitting recess 1b of the implanted part is handled, and the fitting part 2a of the head is fitted therein. The implanted part 1 thus constructed is firmly held in the bone, and the head 2 is firmly fixed to the implanted part 1, so that the R teeth supported on the head can be stably supported without loosening or moving. can.

The implant portion 1, the head 2, and the fitting connection portion thereof are processed by die-casting or injection processing of Ti material or Ti alloy material, and furthermore, precision finishing processing is performed if necessary. In addition, precision processing is performed on the rolled or forged thin plate by laser processing, wire cut electric discharge machining, electric discharge die engraving, drilling, lathe processing, etc., and sheet metal press processing is performed. It is usually effective to finish with a processing accuracy of about 10 μm.

Further, the fitting joint portion may be formed with a concave shape on the implant portion 1 and a convex shape on the head 2, and the tapered surface of the fitting joint portion may be dulled to approximately 5μRmaxPi! By finishing it at the same time, I!
The bonding strength can be increased by J-rubbing.

Fig. 3 shows that the implantation part 11 is formed into a double blade shape in which two flat blades are bridge-connected at the upper end base and face each other almost parallel to each other in the depth direction, and the opposing inner surfaces of both blades are each tapered. A fitting portion 11b is formed into which the head is inserted. (B) is a side sectional view of the implanted portion 11, and (C) is a top view, in which a large number of holes 11a are formed in the flat blade surface. The head 21 is <a
> As shown in the figure, 21a are formed on both sides of the tapered concave fitting part, and are inserted and fitted into the implanted part 11. Since the implantation part 11 is formed into a double blade, the implantation in the alveolar bone is firmly held with more than twice the force, and the retention force of the head 21 coupled to the implantation part 11 is also increased.

Fig. 4 shows a case in which the fitting part of the head that fits into the double blade of the implanted part is shaped like a mouth in which two blades face each other in parallel, and a tapered fitting part 31a is formed on the outer surface of the blade. Then, the head can be inserted and fitted into the implanted part in a compressed state.

FIG. 5 shows a plurality of fitting joints 11b in the implanted part 11.
FIG. 2 is a perspective view of the implantation portion of a double-head implant having a plurality of heads.

FIG. 6 is a top view of a modified example of the single-blade implantation part 1 shown in FIG. ,(b)
The figure shows a round concave part with a downward taper, and the figure (C) shows an inverted triangular concave part with a central convex part tapered downward. Can increase pressure resistance. The figure (d) shows a triangular convex part formed into a tapered shape that widens downward, and the figure (e) shows one with a round convex part, and in both cases, the head that fits and connects to this part is formed in a symmetrical shape. .

Figure 7 is a top view of a modified example of the implanted part of a double blade, where (a) shows a double head with three rectangular fitting recesses formed, and the recesses are formed in a tapered shape with a concave shape at the bottom. . (b) The figure shows one with three triangular fitting recesses, (C) shows the one with one square fitting recess, and (d)
) The figure shows one triangular fitting recess formed.

FIG. 8 is an exploded perspective view of the implanted part 1 and the head 2. The implanted part has a downwardly concave tapered fitting recess 1b, and the head 2 has a corresponding reverse tapered fitting part 2a. Ru.

In FIG. 9, the convex part of the concave-convex fitting part 1b is formed in the implanted part 1 in a tapered shape that widens downward, and the head part 2 is formed with a reverse tapered concave part 2a that fits therein.

In this case, compressive stress is greater when the convex portion of the implanted portion is tightened by the concave portion 2a of the head 2, and is stronger than the tensile stress that is generated when the implanted portion 1 is expanded by insertion of the head 2 as shown in FIG.

In addition, when the implanted part is surgically implanted into the alveolar bone during treatment, a rod-shaped plug is inserted in advance into the tapered hole where the head is fitted and connected, and the plug is handled when the head is connected after implantation. By inserting and fitting the head therein, it is possible to easily and reliably connect the parts without foreign matter entering the fitting gap.

FIG. 10 shows Haku's embodiment, in which the outside of the implantation part 3 is formed into a screw shape 3a, so that it can be screwed into the teeth of the jawbone and the narrow part of the teeth. A tapered fitting hole 3b is formed from the top surface along the central axis, into which the tapered portion 4a of the head 4 is inserted and fitted. Of course, the tapered hole 3b may have a rectangular taper instead of a circular shape.

The outer shape of the embossed part is formed into a screw shape, and since it is embedded into the bone, it can be closely bonded and the retention force can be increased.

In each of the above embodiments, the taper of the fitting portion is approximately 2° to 5°.
°Culm degree, and according to experiments, pressure cuff 0
k>, and the pulling force was about 2 in 24.

FIG. 11 shows another embodiment, in which the implanted portion is formed into a double-blade shape 5, and a long tapered fitting hole 5b is formed inside from the top surface, where (I ) Insert and fix the tapered fitting part 6a of the head 6 in the figure.(a
) In the figure, 5a is a hole for bone regeneration in the implant blade, and 5C is a fold formed on both the left and right ends of the blade, which is designed to increase the contact area with the bone and increase the retention force. . The head 6 is fixed to the oblong tapered fitting part 6a,
Since this is inserted into the tapered fitting hole 5b of the implanted portion, a stable implant with high bonding strength and holding power can be constructed. In addition, the figure (C) shows the tapered fitting part 6.
It is a double head type with two heads 6 installed on a, and two heads are installed at the same time.
Two heads 6 can be fitted together.

In FIG. 12, the tip of the blade of the implanted portion 5 is rounded to have an uneven shape, and is formed in a stress dispersion shape that disperses the pressure applied to the head over the entire blade. A fitting hole is formed from the top surface, into which the head 6 is inserted, but when the implanted part is surgically implanted into the bone, the top surface is covered with a lid 7, and after surgery, the lid 7 is removed and the head 6 is inserted. The portion 6 is fitted and fixed.

FIG. 13 shows a tapered fitting part 6 in which a tapered fitting recess 8 is attached to the upper surface of the implant part 5 and the head 6 is connected to the tapered fitting recess 8.
b is inserted and fixed.

(Effects of the Invention) As described above, according to the present invention, an artificial tooth root has an implanted part embedded in the alveolar bone and a head that is connected to the implanted part and serves as an abutment for a denture exposed in the oral cavity. The implanted part and the head are divided and provided so that they fit and connect with each other, and the fitting joint part is tapered so that it is inserted into the implanted part and fixed to the head. Because of this, the implantation surgery into the alveolar bone can be easily performed, and the implanted part can be quickly boned, and since the head is connected to this fixed implanted part, the implanted part can be fully boned and the head can be firmly attached. It increases the holding power and prevents loosening or movement, making it possible to stably and reliably support the denture. In addition, since the implantation part and the head are connected by a tapered fitting connection, sufficient pressure resistance (70 ki or more) is obtained against the occlusal force in the insertion direction, and the connection is strong and stable without loosening. It has the effect of providing holding power. In addition, since the head part is a tapered joint, it is easy to pull out the head part, which is extremely convenient when making precise corrections and finishing.

[Brief explanation of drawings]

Fig. 1 shows a conventional implant, Fig. 2 shows an embodiment of the present invention, (a) is a side view of the head, (b) is a side view of the implanted part, and (c) is a top view. , FIGS. 3 to 13 show other embodiments of the present invention. 1...... Implant part 1a... Hole 1b... Taper fitting joint part 2.
···········head

Claims (1)

[Claims] In an artificial tooth root that has an implanted part embedded in the alveolar bone and a head connected to the implanted part and used as an abutment for a denture exposed in the oral cavity, the implanted part and the head are divided and mutually separated. 1. An artificial tooth root, characterized in that the tooth root is provided so as to be fitted and connected, and the fitting connection part is tapered so that the head can be inserted and fixed into an implanted part.