WO2005053566A1

WO2005053566A1 - Assistant for implant stent and using method thereof

Info

Publication number: WO2005053566A1
Application number: PCT/KR2004/000147
Authority: WO
Inventors: Jong-Pil Kim
Original assignee: Jong-Pil Kim
Priority date: 2003-12-03
Filing date: 2004-01-28
Publication date: 2005-06-16
Also published as: KR20050053479A; CN1901848A; KR100497784B1

Abstract

The present invention relates to an assistant for implant stent and using method thereof, and provide the assistant for implant stent comprises, a plate-shaped supporting part; and a guiding part which is extended from the center portion of said supporting part, and in which a drill connecting hole is formed to communicate, wherein the assistant is inserted from the upper part of the implant stent. And, the present invention also provides a method for using the assistant for implant stent comprising the steps of: making plaster cast of mouth, and mounting; making a stent based on the manufactured plaster cast; boring a hole on the center of the stent; incising gingiva of a patient; setting the manufactured stent; checking the location of hole bored on stent and marking on the upper end of alveolar bone; selecting an assistant accorded with the marking on alveolar bone and setting it in the hole of stent; and drilling after inserting a drill through the drill connecting hole of the assistant for stent. According to the present invention, when the alveolar bone of a patient is bored, because the metallic assistant for stent can support a drill stably, precise boring is conducted. Specially, when the location of alveolar bone is missed, by the drill connecting hole formed to be inclined, stable and rapid boring is conducted. And, because the boring depth is confirmed precisely and easily, the operation period decreases sharply.

Description

Title of the Invention ASSISTANT FOR IMPLANT STENT AND USING METHOD THEREOF

Field of the invention The present invention relates to an assistant for implant stent and method for using the same, more particularly to an assistant for implant stent and method for using the same to insert implant into the alveolar bone of a patient more precisely and safely.

Background of the invention Implant is a kind of assistant hardwares which is used to treat a troubled or missing tooth, and one of the recently highlighted medical technologies because it can be not only operated individually without relying on adjacent teeth for support but also used semi-permanently. Generally, a drill is used to establish the location of the implant on the alveolar bone of a patient, the implant is inserted, and an artificial tooth is attached on it.

Therefore, for the successful implantation, it is much more important to create a hole precisely on the alveolar bone of a patient using a drill. Referring to Fig. 1, the stent used for a traditional implantation is illustrated.

The stent is used to guide the precise implant placement by making a model of the artificial tooth operated to a patient previously before placing the implant, is manufactured from resin(acryle) as illustrated, and is inserted to the adjacent tooth. The inserting process of an implant using a stent is as follows. First, the engraved shape of the upper and lower jaws of a patient is acquired by using imprint material of rubber, and the plaster model same with the shape of the upper and lower jaws of a patient is made by pouring plaster into the engraved shape. By attaching the plaster model of upper and lower jaws of the same shape with the real occlusion state of a patient on an articulator playing the same role with the temporomandibular joint of a patient, the interrelation between the temporomandibular joint and the teeth of the upper and lower jaws similar to the state of a patient is revived outside of mouth. After inserting the implant into the position of the tooth lost by using resin and the like, the model is made and used as a stent by predicting the final shape of an artificial tooth to be acquired before operation. The center part of the model of the artificial tooth formed in the stent is the location where the implant is inserted, and forming a hole for a drill in this part completes manufacturing the stent . Stent is generally made to be inserted into the teeth around, and gets support from the teeth around. The number and location of the implant to be inserted is determined by considering integrally the state of the mouth of a patient, the result of X-ray, economical situation and the like. After that, the stent is inserted into the tooth remaining after the incision of the gingival of a patient. In this case, the boring location is indicated on the proper part of the upper end of the alveolar bone of a patient referring to the location of the hole bored on the stent, the indicated place is bored after inserting a drill from the upper part of the hole of the stent in the state of equipping the stent, and the place for inserting the implant on the alveolar bone can be ready. In case that the peak of the alveolar bone in located in the right lower part of the hole formed in stent, the alveolar bone can be bored directly after locating the drill vertically, but the location of the peak of the alveolar bone is often located to inner and outer side from the predicted direction of the hole depending on individual before exfoliating a gingival. In this case, because the boring angle should be changed from the peak part of hole formed in the stent to the peak part of the alveolar bone, the size of the hole is inevitably formed greatly for that case. As the hole is bored small, the range of tolerance of a drill and the error of boring angle are small when the alveolar bone is bored, but in case that the size of the hole is small the boring angle cannot be changed because the drill is held to the wall of this hole and the angle of boring cannot be changed. If the hole is big, a drill during the boring can be significantly shaken, or the operator can err in determining an angle of boring. The scale confirmation of a drill in boring of the alveolar bone is conducted in the surface of the alveolar bone, but that part is far away from sight, the sight in operation is narrow, the sight of operation part can be dim due to the blooding during operation and it becomes difficult for an operator to confirm the scale of drill, so a complication can be induced due to the excessive boring in operation. Therefore, when an operator is abstracted momentarily during operation or makes misjudgement, the chance to have error in an inserting angle of the implant increases or bore excessively is caused, so the degree of fatigue of an operator increases because more concentration is required. Because the boring direction and location of the alveolar bone can be often deviated from the desired direction and location by an operator in the implant inserting using a conventional stent, to confirm the direction of boring of the alveolar bone during operation, the troublesome process of X-ray picturing or confirmation of injury and the possibility of it of main structures around is usually enforced additionally and the operation period is extended, and an operator and a patient become more painful. Detailed description of the invention The present invention was invented to overcome the defects associated with conventional technologies, and it is an object of the present invention to provide an assistant for implant stent to bore a hole precisely and rapidly by equipping on conventional stent and supporting the drill more stably in boring the hole for inserting the implant to the alveolar bone of a patient. And, It is another object of the present invention to provide an assistant for implant stent with which the depth of hole to be bored is measured precisely and easily in boring the hole to insert the implant to the alveolar bone of a patient. To obtain the above-mentioned purposes, the present invention provides an assistant for implant stent comprising a plate-shaped supporting part; and a guiding part which is extended from the center portion of said supporting part, and in which a drill connecting hole is formed to communicate, wherein the assistant is inserted from the upper part of the implant stent. The most basic concept of the assistant for implant stent according to the present invention is that the location of upper entrance of a drill connecting hole formed in the assistant is not changed, and the direction of the drill connecting hole guiding the boring direction of the drill can be changed basically to inner and outer side or rarely to forward and backward according to the anatomic conditions of the alveolar bone of lower part. Repeatedly speaking, the location of the upper entrance of the drill connecting hole is not changed, and the location of the lower entrance can be changed according to the state of the alveolar bone. Therefore, the assistant for implant stent according to the present invention is to insert the guiding part into conventional stent for implant after boring, and to bore the alveolar bone of a patient after inserting a drill through the drill connecting hole formed in the guiding part. On the other hand, the assistant for stent can be equipped inside an inserting guide entrance after the inserting guide entrance made of plastic or metal is equipped in the stent. In this time, it is desirable that the assistant for stent is made of metal, more desirably stainless steel so that the drill is supported more stably. In this case, since the assistant for stent has enough hardness, the diameter of the drill connecting hole formed in the assistant for stent can be equal to the diameter of the drill, so precise boring is possible because the shake of the drill can be prevented during the operation. The boring of an alveolar bone for the transplantation requires several drillings with gradually increasing diameter, in this every drilling the assistants having different drill connecting holes should be replaced. To reduce this troublesome, by equipping the drill connecting hole of small diameter in the assistant with the drill connecting hole of great diameter, the single body assistant can be thought that only the small drill connecting hole is withdrawn after the job of drill of small diameter and the job of great drill is conducted. And, as mentioned above, for the case that the uppermost part of the alveolar bone of a patient is out of the stent hole, it is preferred to form the drill connecting hole to be inclined from a supporting part. When the alveolar bone is out of the stent, a proper assistant of assistants for the stent with various inclination angles of the drill connecting hole can be selected and inserted depending on a patient, thus the drill can be supported stably. That is, after the operation and the gingival exfoliation, if the actual shape of the alveolar bone and the location is similar with the boring part of the upper part of the alveolar bone predicted from the model before the gingival exfoliation, to the boring direction determined by using the surveyor (shelf) on the plaster model first, that is, vertical direction to the upper end face of the assistant, the alveolar bone is bored by inserting the most basic assistant with a drill connecting hole and inserting the drill into a drill connecting hole. If the boring part of the upper end of the alveolar bone is out of the boring location on plaster model after the gingival exfoliation, generally missed to inner and outer side direction, the assistant is inserted to the stent and the alveolar bone is bored by a drill, wherein the assistant having the drill connecting hole accordance with the center of the occlusion face of an artificial tooth, that is the path from the uppermost part of the drill inserting way to the way connected to the boring part of the upper end of alveolar bone, in other words same inner and outer inclination angle, is selected. , . Therefore, it is profitable to previously prepare assistants with various heights and inclination angles. On the other hand, the width of the drill connecting hole can be formed to be expanded in the width as it goes from supporting part to guiding part. In this case it is good to be suitable for various situations with just one assistant for stent. That is, because the width of the drill connecting hole is expanded in the lower end of the guiding part, even if the alveolar bone is out of the stent, the drill can approach by locating inclined. Though, the degree of preciseness becomes lower than the above case, only if the attention is paid in starting the job of boring the operation is possible with no great difficulty. For example, if the lower end of the drill connecting hole is set in the shape of cone or fan, one can be suitable for more various angles. The present invention also provides an assistant for the implant stent which the drill connecting hole is formed inside to communicate, protrusion is formed at the lower end part of, and is inserted from the upper part of the implant stent. In this case, because the area of the upper face of the assistant for stent is smaller than that of the tooth engraved on stent, and the outline of the tooth can be maintained as it is. It is also helpful to predict the direction and location of boring in a particular situation of removing the assistant and operating in conventional method in case that the assistant cannot be used under the operation. And, because this assistant can be reclaimed in the stent and the upper face of the assistant for stent is located lower than the occlusion face of the tooth, the operation is possible with a shorter drill and the lower end face of the assistant for stent is also supported, so it is more stable. That is, because the size of mouth of a patient is various but it is not general, the length of drill usable in operation is limited. Therefore, the fact that same operation with a shorter drill is possible makes the assistant for stent according to the present invention be usable in more cases. As is mentioned above, the drill connecting hole formed in the stent assistant is formed to be inclined downwardly from the upper part, or the width of the drill connecting hole is expanding as it goes away from the upper part, so it is preferable to be suitable enough in case that the location of the alveolar bone of a patient is missed. The present invention also provide an assistant for implant stent which is stick shape having the drill connecting hole formed to communicate inside the assistant for implant stent, and inserted from the upper part of the implant stent, and of which the lower end is directly in contact with an alveolar bone. By supporting the drill wholly the operation is possible more stably by contacting the lower end of the assistant for the stent assistant to the alveolar bone, especially, the depth of boring can be measured by referring to the length of the assistant for stent inserted. For example, in case of boring in the depth of 5mm, if the assistant for stent of 10mm is used, and bored to a marking point on the surface of the assistant for stent after marking the 15mm point from the end of the drill, one can bore precisely to the depth of 5mm. Here, if the lower end of the assistant of the stent is wide, in case that the surface of the alveolar bone is engraved, surface of the bone of the boring part cannot be contacted because the side of the lower end of the assistant is caught by the bone around. Therefore, for this and the better sight for operation, the contact area can be formed narrowly by narrowing the width of the lower end part of the assistant. For example, the shape of the lower end part can be formed like a cylinder with a small diameter or a cone. Until now the lower end of a stent was separated from the alveolar bone, and it was impossible to measure it precisely during the operation, so little by little, the multi level borings was conducted and the depth was confirmed in each level by X-ray. But according to the present invention, because the assistant for stent can be a kind of distance measuring apparatus, the operation can be done precisely in one time. In the time of the bone boring, pieces of bone engraved are held in the groove between the blade of a drill, but until now water is sprayed on moving drill continuously, and it was impossible to collect pieces of bone separated from the groove of drill. But, if the present invention is used, the wall of a drill connecting hole prevents the piece of bone from separating from the groove of drill, and becomes easy to collect the piece of bone. The piece of bone collected here can be used usefully in the self-bone transplantation operation. In above case, it is desirable to form the drill connecting hole to be inclined downwardly, or the width of said drill connecting hole is expanding as it goes to the lower end, and to be suitable for various locations of the alveolar bone. Also, the present invention provides an assistant for implant stent comprising: a supporter of which the lower end face is in contact with an alveolar bone, and the girth of the upper end face supports the lower face of a stent; and a connecting part which is located in the upper end face of said supporter, and inserted into the hole of the stent; wherein a drill connecting hole is formed to communicate between said supporter and said connecting part. In case that many implants are transplanted, the stent becomes long and shake under the operation without stable support, but as is mentioned above, because the supporter supports the lower face of the stent, it becomes possible to operate safely and stably. Particularly, if X-ray is pictured after that the stick for measuring magnification with the predetermined length is inserted in the drill connecting hole, the magnification of X-ray picture can be confirmed easily by comparing the length of image of the picture with the length of the stick for measuring real magnification. The stick for measuring magnification can be made of material such as metal, and it is desirable that the shape is like stick with both sharp ends to measure precise length on the X-ray picture, and it can be used in every kind of the assistant for stent disclosed in the present invention. The stick for measuring magnification indicates the direction of the implant, that is the direction of boring, so it helps predicting previously whether the anatomic structures such as teeth around, nerves and so on are injured or not before operation. The present invention also provides a method for using the assistant for implant stent comprising the steps of: making plaster cast of upper and lower jaws, and applying the caster of upper and lower jaws into an articulator corresponding to a temporomandibular joint to accord the occlusion state of a patient; making a stent having a pattern of an artificial tooth at an expected part to be implanted; determining an optimum boring location and direction on the plaster cast; incising gingiva of a patient; checking if the direction of the drill connecting hole of the assistant of the stent is in the same direction of the boring of an alveolar bone after equipping the stent with the assistant inserted, and indicating an accurate boring portion on the upper end of the alveolar bone if it is not ; selecting an assistant having the drill connecting hole toward the boring portion indicated on the alveolar bone at the center of the occlusion face and positioning it on the stent; and boring the alveolar bone by inserting a drill into the drill connecting hole. Here, the assistant for stent can adopt one of the things mentioned above.

Brief description of the drawings Fig. 1 is a perspective view illustrating a conventional stent for implant. Fig. 2 is a perspective view illustrating the state that first embodiment of stent for implant according to the present invention is equipped in stent. Fig. 3 is a perspective illustrating the embodiment illustrated in Fig.2. Fig. 4 is a sectional view for A- A' in Fig. 2. Fig. 5 is a sectional view for B-B' in Fig. 2. Fig. 6 is a perspective view illustrating the second embodiment of stent for implant according to the present invention. Fig. 7 is a sectional view for C-C in Fig. 6. Fig. 8 is a perspective view illustrating the third embodiment of stent for implant according to the present invention. Fig. 9 is a sectional view for D-D' in Fig. 8. Fig. 10 is a perspective view illustrating the hole forming device used in manufacturing the embodiment illustrated in Fig. 8. Fig. 11 is a perspective view illustrating the state of use of the hole forming device illustrated in Fig. 10. Fig. 12 is a perspective view illustrating the fourth embodiment of stent for implant according to the present invention. Fig. 13 is a sectional view for E-E' in Fig. 12.

Embodiments Hereinafter, an embodiment of the assistant for stent according to the present invention will be described in more detail with reference to the accompanying drawings. Referring to Fig. 2, the state that the first embodiment 100 of the assistant for stent according to the present invention is equipped in the stent 10 is illustrated. The stent 10 is composed of the material such as resin(acryle) and so on, and inserted in the state that the both ends are supported on the remaining teeth 12 of a patient. And, in the center of the stent 10 a stent hole 14 for inserting the first embodiment 100 is formed and the first embodiment 100 in inserted into it. The stent 10 is manufactured in the basically same way with the conventional way. That is, after making the plaster model of mouth of a patient and the stent to fit thereto, a hole is formed in the center of the part corresponding to an artificial tooth to locate the implant to be inserted. Until now the size of hole was formed greater than the diameter of a drill to prevent the drill from interfering with the inner wall of this hole and for the end part of drill to approach the peak face of the alveolar bone, but the diameter of the stent hole 14 in the embodiment is formed to be same with the diameter of a guiding part of the first embodiment 100 mentioned later. Referring to Fig. 3, the first embodiment 100 generally has the shape of T, and a supporting part 110 with the shape of flat plate is formed in the upper part. The supporting part 110 is generally shaped like ellipse, and the guiding part 120 is formed in the back face of the supporting part 110. The guiding part 120 is inserted into the stent hole 14, and a drill connecting hole 130 is formed to communicate with the supporting part 110 and the guiding part 120. Here, a taper part can be formed in the entrance part to insert a drill easily in the drill connecting hole 130. Now by referring to Fig. 4 and Fig. 5, the function of the first embodiment 100 is described. Fig. 4 illustrates the state that the stent 10 is inserted under the state of incising the gingival of a patient after the manufacture of the stent, and the lower end part roughly illustrates the alveolar bone 16 of a patient. The first embodiment 100 is inserted from the upper part of the stent 10, and the lower part is located separated from the alveolar bone 16. In this state, after inserting the drill 18 from the upper part of the first embodiment 100 into the drill connecting hole 130, and confirming the marking part indicated in the peak of alveolar bone, the boring is started. At this time the diameter of the drill connecting hole 130 is set a little greater than the diameter, of the drill 18. Therefore, it is necessary to select the assistant for stent corresponding to the drill used. On the other hand, according to situation, the peak of alveolar bone can be located out of the lower part of the assistant for stent. Fig. 5 illustrates the case that the alveolar bone is located slightly to the right from the lower part of the assistant for stent, in this case the assistant for stent having the drill connecting hole 130 formed by not rising vertically but inclining is selected and equipped. That is, ready-made assistants having various angles of the drill connecting hole 130 can be used depending on various situations. Therefore, in case that the drill is arranged and bored not vertical but inclined, the safe and precise operation is possible.

Referring to Fig. 6, the second embodiment 200 of the assistant for stent according to the present invention is illustrated. The second embodiment 200 is same with the first embodiment except that it is supported on the stent in the lower part of the assistant instead of that it is supported on the stent in the upper part It in the first embodiment. For this, the second embodiment 200 comprises a body 210, and a protrusion 220 protruded from the lower face of the body 210, due to the border of this the protrusion 220 and the body 210 is shaped like stairs. And, A drill connecting hole 230 is formed to communicate the entire of the protrusion 220 and the body 210. Fig. 7 is for description of the function of the second embodiment 200, and is relevant to the Fig. 4 basically. The second embodiment 200 is equipped from the upper part of the stent 20, and the hole 22 of the stent 20 is formed same with the outline of the second embodiment 200. In this time, for the upper part of the stent hole 22 corresponding to the body 210, the size of body is relatively smaller than that of the first embodiment and the upper face of the stent 20 is not injured much, so the outline of teeth can be maintained as it is. Also in the special situation of not being able to use the assistant during operation, thus operating has to be conducted in conventional method with removing the assistant, and in it is helpful for an operator to predict the direction and location of boring. And, the location of the upper face of the assistant for stent is lower than that of the first embodiment. Due to this, the alveolar bone can be bored in same depth by using a shorter drill, so the cases of using in the second embodiment increase compared to those in the first embodiment. On the other hand, in the second embodiment like the first embodiment, assistants having various inclined angles of the drill connecting hole can be pre-made and used according to the location of the alveolar bone of a patient.

Referring to Fig. 8, the third embodiment 300 of the assistant for stent according to the present invention is illustrated. The third embodiment 300 comprises one body 310 with same sectional shape to the entire, and a drill connecting hole 320 formed through it to communicate. Here, the side of the body 310 is a plane not a curve, this is for fixing tightly and not rotating when it is inserted to a stent The third embodiment is different from the embodiments mentioned above in that the lower end face of the body 310 is in contact with the alveolar bone 16. That is, as is illustrated in Fig. 9 after equipping the stent 30 on the tooth of a patient, the third embodiment 300 is inserted in the stent hole 32 until the lower end face is contacted with the alveolar bone 16. After that, the boring is conducted, and a short drill can be used like the second embodiment because the upper end face of the assistant for the stent is formed lower than the stent. Because the lower end part of the third embodiment is supported by the alveolar bone, it is possible to lower the upper end face more than the second embodiment. And, in case of the third embodiment, the depth of boring can be easily confirmed because the lower end face is in contact with the alveolar bone. For example, if the depth to be bored is 5mm, the assistant for the stent of 10mm is equipped and the point of 15mm from the end of drill 15mm is then marked 19. In this state the boring begins and when the marking 19 is accord with the upper end face of the assistant for stent, the depth of boring reaches 5mm. The depth of boring can be confirmed easily through this. Of course, in the third embodiment, assistants having various inclined angles of the drill connecting hole can be pre-made and used adequately in operation. On the other hand, in the third embodiment, the shape of the stent hole 32 is not circle, so it is impossible to manufacture by drilling. Therefore, it is desirable to use a hole forming device 350 illustrated in Fig. 10. The hole forming device 350 comprises a forming part 352 with the same section with the body 310, and a cylindrical connecting part 354 extended from the lower face of the forming part 352. As is illustrated in Fig. 11, in manufacturing the hole forming device 350, after forming the hole in the alveolar bone where an artificial tooth is inserted in a mouth plaster model, if the stent is made in the state that a connecting part 354 of the hole forming device is inserted, the stent hole 32 in which the body 310 can be inserted in the stent can be formed. This is available to the second embodiment. That is, because the shape of the stent hole is not circle in the second embodiment, the stent hole can be formed by using the hole forming device with the appearance of the assistant to be inserted. Referring to Fig. 12, the fourth embodiment 400 of the assistant for stent according to the present invention has basically the shape of turned over the first embodiment. That is, in the lower end part of the fourth embodiment 400 a supporter 410 is located, the lower end face of the supporter 410 is placed on the upper end of the alveolar bone incised, and in the center of the upper face of the supporter 410 the connecting part 420 which is inserted to the stent hole 42 of the stent 40 is formed. The width of the connecting part 420 is narrower than that of the supporter 410, and the drill connecting hole 430 is formed to communicate through the connecting part 420 and the supporter 410. Referring to Fig. 13, the state of the fourth embodiment equipped is illustrated. As is illustrated, the fourth embodiment is equipped from the lower part of the stent, the lower face of the supporter 410 is located on the alveolar bone 16, and the girth in the upper face of the supporter 410 supports the stent in the state of in contact with the lower face of the stent 40. In case of transplanting many implants the stent can be supported more stably through this. On the other hand, differently from that illustrated in Fig. 13, the fourth embodiment can be the shape of rotating to 90 degree. That is, by equipping to be located that the longitudinal direction of the wings protruded to both sides in the supporter 410 is vertical to the going direction of the alveolar bone, the enough distance between adjacent assistants for the stent assistant can be secured.

Industrial availability According to the present invention comprised as above mentioned, first, because an alveolar bone is bored by inserting a drill as predetermined angle of bone boring, it is unnecessary to worry about the variation of the angle during operation, the operation period is shortened, the operation can be progressed easily and conveniently, and thus the degree of fatigue of an operator decreases. Though the boring angle predicted out of mouth is changed due to the disposition of the location of the alveolar bone during operation, the location of the center of the occlusion face is not changed, and a desired final assistant hardware can be made and equipped. And because the inclination angle changed can be measured numerically, scientific and mechanical job is possible. Second, the induction of a drill by the assistant prevents the frill from shaking in boring and makes the stable and precise boring of an alveolar bone possible. Third, because the boring angle predicted and determined out of mouth can be revived in the mouth in real operation, the result of operation can be predicted to some extent before operation. Similar to a real operation process, perfect parallel is pursued between front and back and between inner and outer among several implants on the mouth model with surveyor(shelf) out of mouth, and even if it is the state of no gingival exfoliation, by conducting the sham boring on the part decided to be the best and applying the angle of boring to the assistant for stent, more mechanical result can be pursued. Actually the front, back angle during the operation using an assistant is rarely changed, only inner, outer angle can be changed according to the location of an alveolar bone. And by equipping an assistant on the stent before operation, equipping the stent in the mouth of a patient, and picturing X-ray, the length of implant to be inserted is predicted, the appropriate direction of the drill connecting hole and the relations with the main structures around is also predicted, and the inserting direction can be modified

previously if necessary. Fourth, in case that an assistant is in contact with an alveolar bone, in boring to the expected depth, by locating the scale of a drill which is added the length of the assistant to the depth of boring at the uppermost part of the assistant, the boring job is eased without difficulties shown in conventional operation that the depth of boring must be measured in the bad sight due to blooding and so on, and excessive boring can be prevented, so the stability of operation can be increased. Fifth, because the main body of an assistant is standardized and the drill connecting holes of various sizes and various angles can be changed alternately, it can be effectively used in different operation conditions. Sixth, an assistant can be used as a tool to correct the ratio of magnification in X-ray picturing, and specially an accurate magnification ratio of X-ray picture can be determined by inserting the stick for measuring magnification . Seventh, in the special situation that an assistant cannot be used during operation, the operation can be conducted in conventional method by removing the assistant.

Claims

Claims 1. An assistant for implant stent comprising: a plate-shaped supporting part; and a guiding part which is extended from the center portion of said supporting part, and in which a drill connecting hole is formed to communicate, wherein the assistant is inserted from the upper part of the implant stent.

2. The assistant for implant stent of claim 1, wherein said guiding part is extended to be inclined from the supporting part.

3. The assistant for implant stent of claim 1, wherein the width of said drill connecting hole is expanding as it goes from the supporting part to the guiding part.

4. An assistant for implant stent which the drill connecting hole is formed inside to communicate, protrusion is formed at the lower end part of, and is inserted from the upper part of the implant stent.

5. The assistant for implant stent of claim 4, wherein said drill connecting hole is formed to be inclined downwardly from the upper part.

6. The assistant for implant stent of claim 4, wherein the width of said drill connecting hole is expanding as it goes away from the upper part.

7. An assistant for implant stent which is stick shape having the drill connecting hole formed to communicate inside the assistant for implant stent, and inserted from the upper part of the implant stent, and of which the lower end is directly in contact with an alveolar bone.

8. The assistant for implant stent of claim 7, wherein said drill connecting hole is formed to be inclined downwardly from the upper part.

9. The assistant for implant stent of claim 7, wherein the width of said drill connecting hole is expanding as it goes to the alveolar bone.

10. An assistant for implant stent comprising: a supporter of which the lower end face is in contact with an alveolar bone, and the girth of the upper end face supports the lower face of a stent; and a connecting part which is located in the upper end face of said supporter, and inserted into the hole of the stent; wherein a drill connecting hole is formed to communicate between said supporter and said connecting part.

11. The assistant for implant stent of claim 10, wherein said drill connecting hole is formed to be inclined downwardly from the upper face of the connecting part.

12. A method for using the assistant for implant stent comprising the steps of: making plaster cast of upper and lower jaws, and applying the caster of upper and lower jaws into an occlusion apparatus corresponding to a temporomandibular joint to accord the occlusion state of a patient; making a stent having a pattern of an artificial tooth at an expected part to be implanted; determining an optimum boring location and direction on the plaster cast; incising gingiva of a patient; checking if the direction of the drill connecting hole of the assistant of the stent is in the same direction of the boring of an alveolar bone after equipping the stent with the assistant inserted, and indicating an accurate boring portion on the upper end of the alveolar bone if it is not ; selecting an assistant having the drill connecting hole toward the boring portion indicated on the alveolar bone at the center of the occlusion face and positioning it on the stent; and boring the alveolar bone by inserting a drill into the drill connecting hole.

13. The method for using the assistant for implant stent of claim 12, wherein said stent assistant is inserted from the upper part of the stent.

14. The method for using the assistant for implant stent of claim 13, wherein said stent assistant is inserted from the upper part of the stent until it is contacted with the surface of the alveolar bone.

15. The method for using the assistant for implant stent of claim 12, wherein said stent assistant is inserted from the lower part of the stent.