DE2715689A1 - DISPOSABLE OR DISPOSABLE WRENCH FOR SELF-SCREWING SURGICAL HOLDING PINS - Google Patents

Description

Dipl.-In ₉ . H. MITSCHERLICH Dipl.-Uq. K. GUNSCHMANN

Dr.r.r. not. W. KÖRBER

Dipl.-l η <j. J. SCHMIDT-EVERS PATENT LAWYERS

D-800C MCNCHEN 22 Steinsdorfstrasse 10

f £> (089) * 29 66 84

April 7, 1977

Anthony Joseph Biggs 9 Westdown

Great Bookham / Surrey England

Patent application

Disposable or disposable wrenches for screwing in surgical retaining pins

709842/0942

The present invention relates to single-use or disposable wrenches for screwing in surgical wrenches Retaining pins and in particular self-tapping surgical pins for use as Holding aids in dental and orthopedic surgery.

In dentistry, superstructures are generally built over substructures that are broken up from or undermined teeth consist of a number of in the substructure or substructure protruding pins is provided around which the upper structure or the superstructure or the Superstructure is formed. The pins are originally made of wire of certain lengths, which is made into a mass not hardened dentist cement is introduced, this cement or dental putty in one in the Dentin drilled hole of larger dimension is provided.

With recent developments in the field, a number of small size bores have been made in the Dentin substructure drilled, with oversized tooth retention pins or tooth retention pins in the holes larger dimensions were used, which are provided with a thread and differ from the substructure extend. Such a process is described in U.S. Patents 3,434,209 and 3,675,328. The one with it used retaining pins are each self-tapping, although not expressly in these Patent documents mentioned the self-tapping Effect of the pen is achieved by a

709842/0942

sharp-edged thread is provided on the pin, which clears the dentin when the post is threaded into the dentin. Usually Pins are inserted into the bores either by using a power tool or the pins are driven manually or by hand. When using a machine operated Tool is necessary that the speed of the pen is relatively low, in general does not perform more than 700 revolutions per minute, otherwise the dentine will most likely break, wherein the break point can extend to the enamel and / or to the gums, so that through the entry of saliva and food in the tooth or in the teeth the dental pins that are used, attacked and possibly acute pain. In practice, many own Dentists or dentists found no drilling equipment at the required low speed so that became that when they try, the tooth pins with the help of a mechanically operated tool employing the above problem is unavoidable unless this dentist or dentist is one use a suitable tool with a correspondingly lower speed. In addition, those are at this Method pens used are extremely small and require careful handling.

As an alternative to the use of power tools, it is also known to use tooth retention pins inserted by hand. For this purpose, the toothed pins are inserted into the clamping head of a hand wrench introduced and to the preformed

709842/0942

Bore brought. When turning the hand wrench the oversized toothed pins enter the bores up to the bottom of the bores and are kept in it due to their oversize. For this reason, the pen, if manually or by means of of a machine-operated tool, called self-screwing, for the difference of the pins, which are self-tapping, if they are not sufficiently sharply threaded, are so that the threads cut away the material that lesser the edge of the hole Forms size into which they are inserted, the screwing in or the thread formation before the introduction of the self-tapping screw thread takes place. In and of themselves these are Terms have often been mixed up or confused, but should be understood here is that the expressions "self-screwing" or "self-tapping" according to the above explanations be used.

It should be noted that the pins according to the two aforementioned US-PS are extremely small and that the use of which is a sensitive process. For example, they can have dimensions of the order of 4 mm in length dimension and 0.508 mm in diameter. Nevertheless, whether the pins in the clamping head a hand wrench or in the clamping head of a dental machine-operated tool are inserted, there is often a risk that the pins from the clamping head and into the throat fall for the patient, especially if the

709842 / 0Θ42

The clamping head is relatively old and can no longer be clamped.

Further difficulties have so far been found in removing the pins from the clamping head, once they have entered the wells to the required depth. In and of itself is The established practice nowadays that the pins break when the wrench or power operated Tool is removed from the mouth, with the stump of the pin that remains in it being pulled out before another pin is inserted into the grip head. This is a time consuming process in itself, if many holes are to be provided with pins.

U.S. Patent 3,861,043 attempts to overcome many of the above problems with a single embodiment of a hand wrench to overcome, whereby the dental post, which is to be attached in the oral cavity, is part of this Forms wrench. To overcome the aforementioned problem of dentin fracture, the dental post thus forms part of a hand tool that is turned by the action of the fingers, wherein, moreover, the dental post has a groove or corrugation or groove in the bottom of the The pin is formed where a thread provided on the pin ends. This groove cuts in Thread into the smaller size hole that was drilled into the dentin beforehand, with an arcuate, outer edge on the thread, which for self-tapping purposes or for Unsatisfactory for self-screwing purposes, one

709842/0942

Has cutting surface which is sufficient to cut of the thread formed by the groove in the smaller size hole. Such a tool is relatively expensive to manufacture due to the need for a Provide a groove on the front surface, in addition, this tool consists of two components is formed, namely from a shaft and a handle, which are to be connected to each other to achieve a one-piece unit.

The solution to another problem with the tool according to US Pat. No. 3,861,043, in particular when the Dental post with a break groove between the part with the groove and the handle is concerned with separating the groove-bearing part of the dental post from the rest Part of the tool acts when the dental post reaches the bottom of the smaller size hole to be achieved by bending the upper part of the pin sideways with respect to the lower part of the pin is. However, this is not a completely satisfactory process because it is obviously the dentin damaged and a fine gap can be formed between the dental post and the dentin, so that Saliva and food debris can enter the teeth, attacking the dental pins. It is also unclear whether the pin breaks anywhere around it. If the break groove is not perfectly circumferential, it will be particularly difficult for the pin to break, if the break point is near the patient's cheek or cheek.

709842 / 0Θ42

The tooth pins in the tools according to US Pat. No. 3,861,043 can only be used to a limited extent, since it is not possible for the dentist to change the length of the post as required in certain cases without losing the groove, which is required to make the hole with the smaller Size dimension to cut thread-wise. In case the pen as an aid to recovery or the rebuilding of the gums in connection with erosion is used, it is expedient reduce the length of commercially available pens to a shorter length by using the The end of the pin is cut off with a cutting disk that rotates at high speed. One of those Operation cannot be carried out in conjunction with the pen of a tool according to US Pat. No. 3,861,043 will. In addition, it is impossible to shorten a pen that is already in the mouth area has been used since heat transfer would then be a major problem.

The object of the present invention is to provide a disposable hand wrench for insertion a self-screwing surgical pen, in particular a dental post, into an in a hard tissue drilled hole of smaller size.

The object of the present invention is also to provide a disposable hand wrench, as previously mentioned, which is formed from a single constituent body, when in manufacture of the same all operations in one scope

709642/0942

direction take place.

Another object of the present invention is to provide a disposable hand wrench - as mentioned before - taking his surgical pen from the remaining part of the wrench without any bending stress can be separated.

According to the invention there is a disposable hand wrench for inserting a self-screwing surgical pen into one that has been drilled into a harp tissue Bore of smaller size is created, this wrench having an elongated body and a weakened area of reduced thickness between the ends of the elongated Body, a self-threading surgical pen or surgical pen device, which consist of a part of the elongated body between the weakened area and a End of the elongated body and a section at the other end or next to the other end of the elongated Body, with a diameter larger than that of any other part of the elongated body is, with this wrench formed in one piece and the weakened area with reduced Thickness is such that when the pin reaches the bottom of the smaller size bore, it separates from the rest of the wrench.

While turning the wrench and the pin into a pre-formed hole in a hard tissue occurs, the shearing or severing takes place

709842/0942

of the pin from the remainder of the elongated body in the weakened area of lesser thickness instead of. The wrench is preferably formed from certain alloys, which are described below and have a brittleness such that shearing occurs particularly easily. The remainder of the elongated body with which the part formed from a pen denotes Hand wrench forms can then be thrown away and a new wrench for use be selected when inserting a pin into an adjacent, pre-formed hole. In the subject U.S. Patent No. 3,861,043, which describes a tool which is also a disposable hand wrench can be mentioned, the pin used according to the invention is self-screwing. Such marking poses no problem whatsoever in connection with a tool, which is operated between the fingers, since the rotational speed or speed is so low. That the risk of damaging the dentin is avoided.

It should be noted that the designation "one-piece" is used in conjunction with the hand wrench according to the present invention, to denote a one-piece tool formed from a single piece of metal. The hand wrench can thus be made from a metal rod with the help of suitable machining of the same will.

709Ö42 / 0942

The term "hard tissue" is used herein to refer to any type of tissue in which surgical pins can be attached to hold prostheses and in particular dentin or dentin Tooth bones.

The wrench according to the invention is preferred made of orthopedic stainless steel. As this forms the only piece of equipment that is placed in the oral cavity or comes into contact with an exposed bone or leg, the risk or danger of infection can be minimized as the overall device sterilized with hot air, water, autoclave methods or cold sterilization solutions can. Alternative sterilization methods that can be used include • γ-irradiation and subjecting an atmosphere of ethylene oxide to pressure for a long period of time (for example 72 hours). This means that the wrench can be completely cleaned of dirt after this method of use be achieved.

One form of orthopedic steel that has been found to have particular value in the Production of wrenches according to the invention has, since this steel easily machined can be used to manufacture the wrench, also with a weakened area lesser Thickness, as previously mentioned, is achievable, although it will break during normal use of the surgical pen, which is part of the

709842/0942

Forms wrench, protrude in a hole which, however, breaks or shears off as soon as the pin reaches the bottom of the hole, Is an alloy En 58J according to BS 1970-1955 (also part 316 S16 according to the British Standard 1970 4 called). Such alloys are not magnetic, as is generally required for stainless steels, which are used in the field of surgery, these alloys essentially consisting of 8 - 12% nickel, 17 - 20% chromium, 2.50 - 3.50% molybdenum, silicon in a minimum amount of 0.20% and carbon, Manganese, sulfur and phosphorus consist in maximum amounts of 0.12, 2.00, 0.045 and 0.045% and the rest iron and inevitable impurities are. The alloy may contain small amounts of titanium and niobium. Especially if the In addition, the key to be used for dental purposes can be the steel alloy in addition 0.2% to improve the free machining properties. The thread of the part of the wrench, which forms a self-screwing pin, can be formed by cutting or milling or rolling will. Such alloys in particular enable precise processing. A roll thread however, it is approximately 20% stronger than a cut thread without the shear properties of the post to affect.

An alternative material that is used to manufacture the pins is an alloy made of titanium and chromium, as is now commonly used in bone implantation. Preferably contain such alloys 92 - 98% titanium, 2-8% chromium and un-

70Θ & 42/0942

avoidable impurities. A particularly preferred alloy 1 contains 97% titanium and 3% chromium.

Since the wrench is made in one piece, it is extremely easy to choose different lengths as required. For example, the post itself can be manufactured in lengths of 4 mm and 7 mm for various purposes for dental purposes. Since the ^v tool and the pin are formed as a unit, it can not happen that by using the stylus, the operator would drop the pin. The enlarged or enlarged part of the elongated body ensures that the wrench can be easily handled by the operator, the operator being able to work quickly at his discretion, so that the risk of the pin screwing into the hard tissue is considerably reduced and the pin will break off, as soon as it reaches a preselected depth, which is already provided before the attachment of the pen. Thanks to the presence of the part at the other end or adjacent to the other end of the elongated body with a diameter greater than that of the elongated body and which can be called a handle, although in use it is held between the finger and the thumb, It is possible to introduce an additional safety factor in the fastening of a surgical pen by tying cocoon floss for dental purposes around this handle and placing another loop on an operator's finger. Since there is no additional tool, be it

709842/0942

A machine-operated, or hand-operated, one is used, the wrench can be in places
that are relatively inaccessible to other tools, including the wrench
in particular can be used in all areas of the mouth.

If the wrench for dental use
is used, the part of the wrench which has a self-screwing dental post
results, with a liquid cavity lining, such as
Hydroxylin can be coated to reduce the risk of one
Reduce Nikrolensens to a minimum and to isolate the pen against temperature changes. Micro-leaks usually occur as a result of cracks or breaks due to the inception stresses and above
in addition, as a result of the impossibility of drilling a perfectly round pin hole when drilling at low speed, as recommended for tight spots
Achieve tolerances in the preparation of the canal. The holding of the self-screwing pin is not impaired by the cavity chuck devices (cavity varnish).

To handle the wrench after the
To facilitate the present invention, the handle, as mentioned above, can be provided with ribs or corrugations or crimps. By using different shapes of ribs or crimps on the handles of wrenches, the self-screwing pin parts of which have different dimensions, it is possible to facilitate the easy visual identification of the pins, which are through the

7098U / 0942

Wrench surrender. The self-screwing dental pins manufactured so far were like this small that it was not possible to easily distinguish between pens of different sizes at first glance.

The wrenches according to the invention are in particular suitable for dental purposes. They can primarily be used as a holding aid find use for example with silver amalgams, silicates and acrylics. Specific operations, in which these pens can be used are as follows:

1. To increase the length of a broken or shortened stop in the construction material can be held.

2. To achieve additional holding force with fixed prostheses, cross pins in already existing gold crowns or gold seals for additional holding Pen pads.

3. To support the structure of a superstructure with any material.

4. As a holding aid for self-hardening of the raw plastics that make up a tooth construction can be added to correct absorption surfaces or temporary splints.

709842/0942

5. For supporting and anchoring in subsequent teeth with any material. To this Purposes can include bending the pins to match the tooth outline.

6. For additional holding of a full crown with a short stop, what other difficulties prepares for holding in the desired position.

7. To increase the holding force in an area in which erosion of the gums has occurred Has. Relatively short pens are used here.

8. To achieve an additional holding force for an acrylic lining as a replacement for a veneer crown.

The wrench part that remains after the self-screwing pin shears off can be thrown away. However, this part is a useful tool in and of itself, because it is basically pointed at one end and can be used by a ceramist as a support stand for firing a porcelain crown or a bridge in an oven . It can also be used as a lost head for small gold inlays, with the curling of the handle providing additional holding power when the lost head is placed in a melting pot containing wax . The remaining part can also serve as a small dowel pin for epoxy model materials. Everything the technician then does too

709842/0942

all you have to do is grind one surface of the wrench flat with a chrome stone or with a grinding wheel before use.

A particularly important use of the remaining part of the wrench, insofar as the dental one As far as reconstructive surgery is concerned, however, it is used as an afterthought should be if a previous denture or caries insufficient dentine to support of the dentures. Post support is also required if the neck area is so narrow is that even if the root canal diameter is small, insufficient dentin remains. About that In addition, in the case of badly aligned teeth, it may be necessary to carry out an optional weakening, whereupon a subsequent preparation takes place in order to achieve a correct denture. To a to use post support, the nerve of a tooth must be dead or electrically killed, the pulp must be removed and the post-support cemented into the root canal. The superstructure meterial is then built around the post afterwards.

The remaining part of a wrench according to the invention can as such as an additional support or preferably after the shaping of its handle Find use. So that the superstructure material is particularly effective at the subsequent Can bind support fuse, is preferably the part of the wrench between the

709842/0942

weakened area of reduced thickness and the handle curled, ribbed or formed like a screw thread.

Although previously in particular on the use of wrenches with the subject matter of the invention When referring to dental surgery, they can also be applied to orthopedic surgery Find. For example, the pins can be used to attach preformed prosthesis parts to attach existing dentin material, for example for plates which are attached to the skull or chin should be, which can also be artificial links that instead of a incorrigibly damaged fingers or can be used as replacement limbs for toe. This one Pins are used to attach flat parts to bones, they can be bent over to keep them in place of the flat part on the bone. However, it is preferred that the part of self-screwing pin next to the area with the reduced thickness of the wrench according to the invention is shaped so that a countersunk head for the pin is obtained when it is in the leg screwed in to hold a part of the prosthesis attached to the bone.

To better understand the present invention and to illustrate the manner in which The invention can be carried out, will now be made only by way of example on the accompanying drawings Referenced; show in it:

709842/0942

Figure 1: A plan view of an embodiment of a wrench according to the invention;

Figure 2: a section through a tooth from which defective parts have been removed, to form a substructure ready to receive a superstructure is;

Figure 3: a section through a tooth, of which

Damaged fabrics or parts have been removed to make a substructure form, which is ready to receive the upper structure.

Figure 4: a view which is similar to that of Figure 3, but in one further enlarged scale is present, the manner illustrated is, in which a dental post is inserted into a hole produced thereby;

FIG. 5: a view similar to that of FIG

is similar, showing a superstructure attached to a dental bone substructure is fixed by means of the tooth pins which result from the wrench according to the invention;

Figure 6 - schematic views of various forms 13: of dentures made by using

709842/0942

the wrench of the present invention can be obtained;

FIG. 14: a plan view of an alternative embodiment a wrench according to the invention;

FIG. 15: a view similar to that of FIG. 5 and the remaining part of one Wrench of the type shown in Figure 14 shows when he is as a subsequent Prop is used; and

FIG. 16: a plan view of an inventive

Wrenches for use in orthopedics.

In the drawings, like reference characters indicate like parts in each figure.

Referring first to Figure, this figure shows a dental screwdriver 1 which is formed by drawing from a single rod of orthopedic stainless steel the wrench is punched, this having an elongated body 2 represents, which has a ribbed handle part 3 of larger diameter and with a part 4 reduced diameter is connected, which is formed by means of a neck portion 6 reduced thickness Has screw thread 5, and results in a region of a predetermined weakening.

Referring now to Figure 2, this figure shows a tooth 10 in the soft tissue 12 of the gums. Of the

709842/0942

Body 12 of tooth 10 consists of dentin or dentin and encloses a pulp canal 13 Dentin extending from the soft tissue is covered with an enamel layer 14. To get the tooth to build a Part 15 of the enamel and part 16 of the Dentin removed to remove rot and undermined parts of the substructure and around the hollowed out parts To form surface 17 that no longer has any rot.

To create a superstructure on the hollowed out surface 17, several bores 18 are made into the dentin from the surface 17 using a Drill 19 drilled according to Figure 3. The drill bit 20 of the drill can have a diameter of, for example approximately 5.0 mm (0.20 in.) The number of required for a particular substructure Channel 18 varies according to surface area the hollowed surface 17 and a portion of the dentin 16, and the enamel 15, which must be replaced by a superstructure. In certain cases a single hole is sufficient.

Returning now to FIG. 4, it can be seen that a dental post 4 is inserted into the dentin 12 target. For this purpose, the wrench 1 shown in Figure 1 is via a hole 18 (Figure 3) brought and rotated by hand to insert the screw-threaded pin into the bore. In the example shown, the pin is about 6.0 mm (0.24 in.) In diameter.

709842/0942

As soon as the pin 4 has reached the bottom of the bore 18, further turning of the screwdriver results in part 2 the shearing from the pin as a result of a break at the neck portion 6. The one in the hand of the Operator's remaining portion of the screwdriver is then discarded and replaced with a new wrench for inserting a pin into another hole.

When a dental post has been self-threading into each bore 18, as final Operation, the superstructure is placed on the exposed, hollowed surface using the Supporting capacity of the dentin built up, with the help of the protruding pins 4 to hold the Superstructure in position is to be taken into account. Referring now to Figure 5, a superstructure 21 can be built up on the hollowed surface 17 of the tooth. Referring now to Figures 6-13 These figures show various special uses of the retaining pins made possible by the inventive Screwdrivers are created and used.

Thus, Figure 6 shows the attachment of a porcelain crown, a gold / porcelain crown or an acrylic crown 31 on the dentin 32, the holding being carried out with two holding pins 33, which after they have been attached have been bent at the dentin. In this way the length of an aborted or if the stop has become shorter.

709842/0942

FIG. 7 shows the fastening of a gold tooth replacement 34 in a cutout 35 of a tooth using a locking screw 36 and two retaining pins 37. As an alternative to use a locking screw can also be a self-screwing or self-tapping surgical one Pin into the tooth from side 38 opposite that which has the gold insert should be introduced. Such a way of working can also be used for edition work with the pen Find use.

Referring now to Figure 8 it can be seen that two pins 39 and 40 are laterally in a substructure 41 attached and used in the attachment above the same of a superstructure 42, which replaces a broken corner. Because of the position of the break point it is necessary that the pins lie outside the added substructure and are therefore visible, so that they can be held on effectively the superstructure can be achieved. Figure 9 shows the use of a number of pins 43, which serve to hold a provisional splint 44 formed from acrylic material and placed on a Row of teeth 45 is provided. Such a splint as a temporary measure is required if the Position of the teeth is such that teeth from opposite chins are not aligned and must be made right to escape. This temporary, i.e. this splint, is used to open the mouth Implementation of the replacement work.

709842/0942

Figure 10 simply shows the use of the Screwdrivers according to the invention result in self-screwing pins for holding larger quantities of superstructure material 46 on a jaw tooth or upper lip tooth 47. In this case, are 3-5 posts per tooth required.

Figure 11 shows the use of a retaining pin 48 for reattaching a crown 49 on the tooth Such reattachment is necessary if a crown threatens to fall while chewing, which is a particular problem, if the crown is intended on a short tooth stump. The process of inserting a dental post using a wrench according to the invention has a particular value, which consists in that due to the initial drilling, air can be let out of the crown.

Figure 12 shows the use of the inventive Wrench-made tooth pins to increase the holding force in an area in which gum decay has already taken place. In this case the gum is 51 shrunk back from the portion 52 of the enamel covered tooth, with a zone 53 of exposed soft dentin is created. A cover layer 54 is added to this dentin, which is passed through the pins 55 is held in place.

Finally, FIG. 13 shows a cold-cured layer 56 made of acrylic resin, which is provided with a bent self-screwing pin 57 in position

709842/0942

is held, which results in connection with a wrench according to the invention and as A replacement for a defective veneer crown on a tooth 58 is used.

Referring now to Figure 14 of the drawings in which like numerals indicate like parts in Figure 1, has in a modified embodiment of a wrench 61 according to the present invention, the same can be done by cutting or punching out a single rod of orthopedic stainless steel Steel is formed, an elongated body part 62 which is slimmer than the body part 2 according to FIG and is screw-threaded along its length dimension. When used as a Dental wrench for inserting part 4 into a pre-drilled hole in a tooth the wrench acts in a manner which is the same as that according to FIG. The one after Shearing off of the pin 4 remaining part can, however, in particular due to the shape and the screw thread of the part 62 can be used repeatedly. Referring to Figure 15, the remainder Parts as endopost with the reference numeral 63 after the processing of the handle part to form a part 64 with a relatively small diameter is used. The threaded portion 62 of the endopost, which was produced in the process, is inserted into the enlarged root canal 65 within a Broken tooth 66 introduced, the broken end 67 of which has been ground off. This Endopost rests on a silver point 68, which was previously in the

709842/0942

Base of the root canal has been inserted. Cement, not shown, is used to hold the endopost part in place in the enlarged root canal in full contact with the one along the entire length dimension the same extending thread. A crown 69 is inserted or turned up on the head part 64, wherein cement 70 is used to adhere this part.

Holding the handle part of the remaining parts that obtained after sheared from the pin in order to file it down around the head of an end mail piece Forming can be done by holding the remaining part in a Jacob-style chuck which is located in a dentist's lathe or even held by hand.

Finally, referring to FIG. 16, this figure shows a wrench according to the invention which in particular as a modified embodiment for general use in the surgical field Area for attaching plates and the like to the bone suitable. The same reference symbols in turn show the same parts in FIG. 1. This wrench is different differs from that shown in Figure 1 in that the elongated body 2 has a larger diameter and its tapered part extends into a part 71 of section 4 with the reduced diameter, to form a countersunk head to the portion with the reduced diameter, this part to hold flat plate links in position, which is used with the help of the self-screwing Pin are attached to the bone, which is formed by the part 4.

709842/0942

The wrench shown in Figure 16 finds
used in some of the aforementioned operations. The pin 4 with the countersunk head 71 can thus be used instead of the locking screw 36 according to FIG. 7 for fastening a gold tooth replacement in a cut-out part of a tooth. Such a surgical pin can optionally be used instead of the simple tooth pins 43 and 48 according to FIGS. 9 and 10 for holding a crown or the like on the dentine.

The patent attorney

709842/0942

Claims (15)

Claims One-way or one-way wrenches for screwing in surgical retaining pins in a small bore drilled in a hard tissue, the wrench being an elongated Body, an area of reduced thickness between the ends of the elongated body, a surgical retaining pin device consisting of part of the elongated body between the area of reduced thickness and one end of the elongated body and a part adjacent to it the other end of the elongated body with a diameter larger than either is the other part of the elongated body, characterized in that the surgical retaining pin device (4) is provided with a thread such that it is self-tapping that the area (4) the reduced thickness is sufficiently weak to be severed or closed break when said one end of the elongated body (2) lower the bottom of the bore (18) Reached size and that it is integrally formed. 2. Wrench according to claim 1 for inserting a self-threading tooth retaining pin (4) in a small bore (18) drilled in a tooth (10), characterized in that the tooth retaining pin (4) 709842/0942 ORIGINAL INSPECTED consists of said self-tapping surgical post assembly. 3. Wrench according to claim 2, characterized in that g e identifier I mean that part of the elongated body (2) between the weakened area and said other end of the elongate body (2) has a roughened surface. 4. Wrench according to claim 3, characterized in that the surface roughening is formed by grooved areas, ribs or screw thread cutting. 5. Wrench according to claim 1, characterized in that a portion of the Part of the elongated body (2) between the weakened area and said one End of the elongated body (2), said portion being at the weakened area reduced thickness adjoins, is sunk. 6. Wrench according to one of the preceding claims, characterized in that that said section at the other end of the elongate body 2 has a roughened surface having. 7. wrench according to claim 6, characterized in that the surface 709842/0942 roughening is formed by ribs or fluted areas. 8. A wrench according to any one of the preceding claims, characterized in that it consists of orthopedic stainless steel consisting essentially of 8-12% nickel, 17-20% chromium, 2.50-3.50 molybdenum, silicon in a minimal amount of 0.20% and carbon, manganese, sulfur and phosphorus in maximum amounts of 0.12, 2.00, 0.045 and 0.045% , the remainder being iron and inevitable impurities. 9. wrench according to claim 8, characterized in that the stainless steel additionally contains titanium and / or niobium. 10. Wrench according to claim 8 or 9, characterized in that the stainless steel contains 0.2% selenium. 11. Wrench according to one of claims 1 7, characterized in that it is formed from an alloy of titanium and chromium. 12. Wrench according to claim 11, characterized in that the alloy contains 92-97% titanium, 2-8% chromium and unavoidable impurities. 709842/0942 13. Wrench according to claim 12, characterized in that the alloy consists of 97% titanium and 3% chromium. 14. Wrench according to one of the preceding claims, characterized in that that the self-tapping surgical retaining pin coated with cavity varnish is. 15. Wrench according to claim 14, characterized in that the cavity varnish is hydroxylin. 709842/0942