CA1302129C - Tool for use in applying filler material to an endodontically prepared root canal - Google Patents
Tool for use in applying filler material to an endodontically prepared root canalInfo
- Publication number
- CA1302129C CA1302129C CA000563877A CA563877A CA1302129C CA 1302129 C CA1302129 C CA 1302129C CA 000563877 A CA000563877 A CA 000563877A CA 563877 A CA563877 A CA 563877A CA 1302129 C CA1302129 C CA 1302129C
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- filler material
- end portion
- root canal
- distal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims abstract description 60
- 210000004262 dental pulp cavity Anatomy 0.000 title claims abstract description 38
- 239000000945 filler Substances 0.000 title claims abstract description 33
- 239000000899 Gutta-Percha Substances 0.000 claims abstract description 27
- 240000000342 Palaquium gutta Species 0.000 claims abstract description 27
- 229920000588 gutta-percha Polymers 0.000 claims abstract description 27
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 18
- 238000002560 therapeutic procedure Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000007373 indentation Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 210000000332 tooth crown Anatomy 0.000 description 1
Landscapes
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
A TOOL FOR USE IN APPLYING FILLER MATERIAL TO AN
ENDODONTICALLY PREPARED ROOT CANAL
Abstract of the Disclosure A tool for use in applying filler material, such as gutta-percha or the like, to an endodontically prepared root canal of a tooth in the form of an elongated shaft of material having high biological tolerance, the shaft having a handle portion at the proximal end, the shaft being adaptable to receive filler material formed thereon formed into a conical configuration so that the shaft having the filler material thereon may be positioned in the root canal and the shaft thereafter severed by applying force to the handle portion to retain the portion of the shaft and the filler material within the root canal.
ENDODONTICALLY PREPARED ROOT CANAL
Abstract of the Disclosure A tool for use in applying filler material, such as gutta-percha or the like, to an endodontically prepared root canal of a tooth in the form of an elongated shaft of material having high biological tolerance, the shaft having a handle portion at the proximal end, the shaft being adaptable to receive filler material formed thereon formed into a conical configuration so that the shaft having the filler material thereon may be positioned in the root canal and the shaft thereafter severed by applying force to the handle portion to retain the portion of the shaft and the filler material within the root canal.
Description
` ` 130~129 Summary of the Invention The conventional techniques for performing endodontic therapy on teeth are time consuming and o~ten do not adequately ensure that the entire canal sys~em is tilled with the repair material. Experience has shown that i~ is not possible to remove all pulpal remnants and contaminants from a root csnal with current prepsration techniques. If the said pulpal remnants and contaminants are thoroughly entombed in the repair material, the endodontic therapy will be successful. If said remnants and contaminants are not thoroughly entombed, there is a high probability of failure of the endodontic therapy.
Complete entombment o the remnants and contaminants requires complete obturation of the canal system.
Experience has shown failure to completely obtrurate the canal system to be the primary cause of failure in endodontic therapy.
~ ncomplete obturation of a root canal system is primarily due to insufficient hydrostatic pressure to effect the proper flow of the filler material to the irregularities of the canal system. Canals are seldom circular in cross section. Thus, any repair material inserted into the canal must be able to compensate for the lack of circularity by flowing to the major diameter volumes. Canals will often have lateral canals and fissures that must be filled with the repair material to ensure the success of the therapy. Hydrostatic pressure must be applied to the repair material to ensure its flow into the lateral canals and fissures.
A common endodontic procedure employs silver cones used in conjunction with pastes to fill irregularities.
Silver, being a highly malleable metal, will bend and adjust to the curvature of a root canal; but, since silver cones are manufactured in true circular cross section, they do not adjust to a canal that is irregular in cross section which is most often the case. The silver cones ~302129 are not capable of exerting hydrostatic pressure on the sealer material, thus there is no satisfactory assurance that lateral canals and tissures are sealed.
Another common endodontic procedure employs a f~ller material, such as gutta-percha as the repalr material.
Gutta-percha is a semi-rigid material at normal room temperature. However, when it is heated, it becomes less rigid and will flow when force is applied to it. Gutta-percha, however, does not retain heat very long, thus the technique requires small amounts of the material be heated and packed into the canal in sequential manner with freguent reheating of the material in the canal. This process is slow and time consuming and also is fraught with the risk that gutta-percha deep into the canal will not be heated sufficiently by in-situ techniques and thus, will not flow properly Into the irregularities of the canal.
Another common endodontic procedure is to employ a gutta-percha heating and injection deYice. This device is commonly referred to as a gutta-percha gun. The gun supplies the gutta-percha to the canal heated and under sufficient pressure 50 as to insure that the canal irregularities will be adequately filled. The problem with the gun technique is that there is no satisfactory method of insuring that the repair material will not extrude through the apex of the root and result in an impacted mass left in the gum.
It is obvious that a technique that can administer a repair material throughout the canal under sufficient hydrostatic pressure will ensure that all the lateral canals and fissures will be filled and will also ensure that all of the remnant pulpal material and contamininants will be sufficiently entombed. It is further obvious that i the technique could adequ~tely prevent the extrusion of the repair material through the canal apex, It would be an improvement over the known techniques. It is further ~302129 obvious that if the techniques could be performed in a single operation rather than in a sequential ~ashion there would be time and thus economic advantages of significance over the known techniques. The invention described hereunder offers these advantages.
The device of the present invention i~ in the form Or a rigid carrier member coated with gutta-percha or similar filler material. The carrier member is a tapered, slender rod. The carrier member may be constructed o~ any material which is of sufficient rigidity and non-toxic when left in the root canal. One material that has been employed successfully is stainless steel. A plastic or aluminum carrier member also works successfully.
The carrier member incorporates a matte finish, or radial ribbing or helixes to provide adhesion surfaces for the gutta-percha and to serve as a mechanical piston to assist in forcing the gutta-percha into the canal.
In one embodiment the tip of the carrier member that is intended for the apex end of the canal incorporates a flat surface which is pointed at the extremity. The carrier member can thus be forced into the canal at a sufficient depth into the taper which then prevents the carrier member from being able to rotate in the canal. A
shaft of the carrier member has an area of lesser diameter than the normal diameter. This point of minor diameter or reduced torque resistance area is desi~ned to fail when a certain level of torque is applied to the handle of the carrier member. The flat on the extremity of the carrier member prevents rotation of the carrier member, thus the member will fail when a torque is applied to the handle.
The reduced torque resistance area is located at a specific point on the carrier member at the desired level in the canal. The portion of the carrier member shat above the reduced torque resistance area is of constant cross section (i.e. not ribbed) to facilitate removal of 1302i29 . . .
the member through the semi-rigid gutta-percha without pulling said gutta-percha out of the canal.
A disc-shaped washer is incorporated on the shaft o~
the carrler member and serves to act as a stopping plug at the coronal opening Or the canal and thus to prevent viscous flow ot the gutta-percha out of the said canal during the insertion process.
The gutta-percha is molded to the carrier member in a tapered or conically-shaped manner so as to facilitate the introduction into the typical canal taper with sufficient material to ensure complete filling of the said canal and thereby complete obturation of the canal.
The devices may be manufactured in a variety of sizes to correspond to standard endodontic files.
In using the tool of this invention the root canal is first prepared in the standard manner by broaching with endodontic tiles. The final file used in the apex preparat~on determines the proper gutta-percha device. A
carrier member o~ proper size is prepared with gutta-percha and the gutta-percha is heated over to the point at which the surface is glossy. The heated apparatus is then inserted into the root canal with firm apical force. The handle portion of the carrier member is the~ rotated while maintaining the apical force until torsional failure occurs.
The shank of the carrier member is then removed while holding the stopping plug or washer against the tooth and the remainder of the endodontic therapy is completed using conventional procedures.
For more information as to background material relating to the present invention reference may be had to pages 184 through 188 of the Journal of Endodontics, Volume 4, No. 6, June 1978 which describes a new gutta-percha technique in which the gutta-percha is formed around an endodontic file.
, ~3~2~29 65224-374 In summary, the present invention provides a tool for use in applying filler material, such as gutta-percha or the like, to an endodontically prepared root canal of a tooth, the canal extending from the tooth coronal area to the root apex, comprising: an elongated shaft formed of material having high biological tolerance, the shaft having a distal end portion and a proximal end portion and being of length such that the distal end is positionable adjacent the tooth root apex when the tool is inserted into a root canal, and the shaft having an integral surface configuration adaptable to retain filler material thereon;
and the proximal end portion forming a handle portion, the distal portion of said shaft being adaptable to receive filler material formed thereon and being insertable into an endodontically prepared root canal and the handle proximal end portion being severable from the distal portion to thereby retain the distal portion and filler material within the root canal.
A better understanding of the invention will be had by reference to the following description and claims, taken in conjunction with attached drawings.
~, ,.~, ~302129 Description of the Drawings Pigure 1 is an enlarged elevatlonal view of the tool, or carr~er member of the present invention. The tool includes a slidable stopper or washer which is shown in cross-section.
Pigure 2 is an elevstional view as in Pigure showing the lower portion of the tool as encapsulated in a conically-shaped quantity of filler material, such as gutta-percha. As shown in ~igure 2 apparatus is ready for use in filling an endodontically prepared root canal.
Figure 3 shows a tooth in cross-section with the root canal having been endodontically prepared and showing the appliance of this invention, in reduced scale, as being employed to apply filler material to one of the endodontically prepared roots.
Pigure 4 is a cross-sectional view of the tooth as in Pigure 3 showing the appliance inserted into the root canal.
Figure 5 shows the next step in a sequence of applying filler material to the root canal wherein the tool has been rotated to sever the proximal portion form the distal portion.
Figure ~ shows the removal of the proximal portion of the tool with the distal portion being retained in the root canal with the filler material.
Fi~ure 7 is an elevational view of an alternate embodiment of the tool of ~igure I in which the shaft of the tool has a matte surface finish.
Pigure 8 is an elevational view of an additional alternate embodiment substantially that of Pigure 7 but wherein the shaft includes spaced circumferential identations.
Pigure 9 is an elevational view of an embodiment as in Figure 7 and 8 wherein the shaft includes spaced indentations which are relatively narrow compared to the indentations of Pigure 8.
-` 1302~29 `
~ Igure 10 is an elevational view of a still different embodiment lncluding spaced enlarged di~meter portions on the shaft.
Detailed Description of the Preerred Embodiment Referring to the drawings, and first to Figure 1, the tool which is a carrier member, iY generally indicated by numeral 10 and is formed of an elongated shaft 12 having a proximal end 14 and distal end 16. While the shaft may be of a variety of cross-sectional configurations the preferred and simplest shape is that of a circular cross-sectional configuration as illustrated. At the proximal ends 16 the shaft is flattened or flared at 18 into a non-circular cross-sectional configuration so that when the shaft is positioned in a root canal of a tooth, as will be hereinafter more specifically described, the flared end portion 18 resists rotation of the shaft. Integrally formed on the shaft are a plurality (three being shown) of spaced apart enlarged cross-sectional dimensioned portions 20A through 20C. When the shaft is circular cross-sectional as preferred, the enlarged diameter portion 20A, 20B and aoc are also preferably an enlarged circular cross-sectional configuration. Instead of spaced apart enlarged cross-sectional portions, an alternate arrangement, not illustrated, includes integral spiraled portions extending frorn the shaft body.
Positioned between the enlarged diameter portion 20A, and the proximal end 14 is a reduced torque resistance area 22. This is in the form, as shown, of a groove formed around the shaft. Between groove 22 and the proximal end 14 is a sliding stopper or washer 24 having an opening 24A therein which slidably receives shaft 12.
Affixed to the shaft at the proximal end 14 is a handle portion 26.
Handle 26 is of a diameter larger than that of a shaft 12 and may be integral with the shaft or is secured to the shaft and made of a material such as plastic.
Pigure 2 shows the appliance ready for use in inserting a filler material, such as gutta-percha into the root canal of an endodontically prepared tooth. Pigure 2 '~' ~302~29 shows, in cross-section, filler material 28 formed on the tool 10. The filler material 28 may be such as gutta-percha which can be rormed by hand onto tool 10. After forming, the gutta-percha may be warmed in a flame to the proper stage.
~ igure 3 shows a tooth 30 having root canals 32 and 34 therein. A canal 3a has been endodontically prepared in the standard technique such as by the use of files to remove the root pulp and to prepare, as well as possible, a clean canal. The appliance formed of tool 10 with the filler material 28 molded thereon is ready for use for filling the root canal 32. The apex of the root canal is indicated at 36 with the tooth crown or coronal portion being indicated by numeral 38.
~ igures 4 through 6 show the continuation of the step of filling root canal 32. ~igure 4 shows the appliance inserted into the canal 32. The filler material 28 is forced by the insertion of the appliance to fill the canal to the apical area 36 of the tooth. Arter full ;nsertion of the appliance as shown in Figure 4, rotational torque is applied to handle 26, severing the shaft at the reduced torque resistance area 22 as shown in ~igure 5. This is possible since the flared distal end 18 of the shaft resists rotation relative to tooth 30.
After the shaft has been severed into two portions, the proximal portion is withdrawn. The sliding washer 24 is used to retain the filling material 28 in the canal by holding the washer downwardly as the proximal end portion of the shaft 12 is withdrawn.
~ igure 6 shows the proximal portion Or the tool being withdrawn. Washer 24 is then removed, leaving the distal portion of the shaft in place within the root canal 32.
The root canal 32 can be more completely filled by applying additional filler material and by applying mechanical or hydraulic pressure to the filler material to 30;~129 force it into the root canal. The coronal area of the tooth can be filled in the usual way.
The depictlon Or the tooth 30 in Pigures 3 through 6 is merely exemplary as teeth are individualistic and the drawings are intended to exemplify the steps involved rather than to accurately pictorially represent the appearance of the tooth or root canal therein.
The invention, thus, provides an unique and very effective way of conveying filler material, such as gutta-percha, into an endodontically prepared root canal. The prior art teaches the use of a file as a carrier of filler material, however, this known method, while functioning successfully for its intended purpose, nevertheless has limitations and problems which are overcome by the present invention.
Pigure 7 through 11 show a family of alternate embodiments of the invention preferablv formed ot plastic material. The shaft 12 i8 of elongated tapered shape in which the distal end 16 is slightly rounded. The handle 26A is integrally formed with the shaft and, as indicated in Figure 11, may be of non-circular cross-section, such as square as shown. Obviously, the handle may be also of hexagonal or other shspes which permits the tool to be manipulated by the endodontist.
The externsl surface of the shaft 12 of Figure 7 is preferably formed with a matte finish so that filler material formed thereon, such as in Figure a, will be secured to the shaft lor insertion into an endodontically prepared root canal. While a sliding washer is not shown in the embodiments of Pigures 7 through 10 it is apparent that a washer can be utilized in the same way as illustrated in Pigures 1 through 6.
The embodiment of Pigures 7 through 10 does not include a flared end as with the embodiment of Pigures I
and 2, however, the lower portion of the shaft can be severed alter insert;on into a root canal by the provision ~30æ~29 of cuts 40 formed in the shaft. The cuts 40 are equivalent to the reduced diameter portion ~2 of ~igures 1 and 2 and provide a stress point. Atter the shaft is inserted into a root canal, the lower portion may be sparated from the upper portion by moving the upper portion back and forth relative to the tooth in which the lower portion is positioned to break the shaft at cut 40.
Pigures 8 and 9 show the embodiment of ~igure 7 but with spaced apart, reduced diameter recesses 42 therein.
In Figure 8 the recesses 42 are rather wide with a curved circumferential bottom surface whereas in ~igure 9 the recesses 42A are much narrower. This illustrates that the shape, size and spacing of the recesses may vary.
Pigure 10 shows an embodiment including integral enlarged diameter portions 44. These portions are semicir¢ular in external configuration as compared with the cylindrical configurations of the enlsrged diameter portions 20A through aoc as shown in ~igures 1 and 2. The enlarged diameter portions 44 serve to help retain tiller material on the shaft while it is being inserted into a root canal.
The alternate embodiments of Figures 7 through 10 illustrate the fact that the tool may take a variety of configurations, each of which is within the purview of the invention and each of which serves the function of permitting more ready and effective insertion of filler material into an endodontically prepared root canal.
The claims in the specification describe the invention presented and the terms that are employed in the claims draw their meaning from the use ot such terms in the specification. The same terms employed in the prior art may be broader in meaning than specifically employed herein. Whenever there is a question between the broader definition of such terms used in the prior art and the more specific use of the terms herein, the more specific meaning is meant.
While the invention has been described with a certain degree of particularity it is manifest that many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. It is understood that the invention is not limited to the embodiments set forth herein for purposes of exemplification, but is to be limited only by the scope of the attached claim or claims, including the full range of equivalency to which each element thereof is entitled.
Complete entombment o the remnants and contaminants requires complete obturation of the canal system.
Experience has shown failure to completely obtrurate the canal system to be the primary cause of failure in endodontic therapy.
~ ncomplete obturation of a root canal system is primarily due to insufficient hydrostatic pressure to effect the proper flow of the filler material to the irregularities of the canal system. Canals are seldom circular in cross section. Thus, any repair material inserted into the canal must be able to compensate for the lack of circularity by flowing to the major diameter volumes. Canals will often have lateral canals and fissures that must be filled with the repair material to ensure the success of the therapy. Hydrostatic pressure must be applied to the repair material to ensure its flow into the lateral canals and fissures.
A common endodontic procedure employs silver cones used in conjunction with pastes to fill irregularities.
Silver, being a highly malleable metal, will bend and adjust to the curvature of a root canal; but, since silver cones are manufactured in true circular cross section, they do not adjust to a canal that is irregular in cross section which is most often the case. The silver cones ~302129 are not capable of exerting hydrostatic pressure on the sealer material, thus there is no satisfactory assurance that lateral canals and tissures are sealed.
Another common endodontic procedure employs a f~ller material, such as gutta-percha as the repalr material.
Gutta-percha is a semi-rigid material at normal room temperature. However, when it is heated, it becomes less rigid and will flow when force is applied to it. Gutta-percha, however, does not retain heat very long, thus the technique requires small amounts of the material be heated and packed into the canal in sequential manner with freguent reheating of the material in the canal. This process is slow and time consuming and also is fraught with the risk that gutta-percha deep into the canal will not be heated sufficiently by in-situ techniques and thus, will not flow properly Into the irregularities of the canal.
Another common endodontic procedure is to employ a gutta-percha heating and injection deYice. This device is commonly referred to as a gutta-percha gun. The gun supplies the gutta-percha to the canal heated and under sufficient pressure 50 as to insure that the canal irregularities will be adequately filled. The problem with the gun technique is that there is no satisfactory method of insuring that the repair material will not extrude through the apex of the root and result in an impacted mass left in the gum.
It is obvious that a technique that can administer a repair material throughout the canal under sufficient hydrostatic pressure will ensure that all the lateral canals and fissures will be filled and will also ensure that all of the remnant pulpal material and contamininants will be sufficiently entombed. It is further obvious that i the technique could adequ~tely prevent the extrusion of the repair material through the canal apex, It would be an improvement over the known techniques. It is further ~302129 obvious that if the techniques could be performed in a single operation rather than in a sequential ~ashion there would be time and thus economic advantages of significance over the known techniques. The invention described hereunder offers these advantages.
The device of the present invention i~ in the form Or a rigid carrier member coated with gutta-percha or similar filler material. The carrier member is a tapered, slender rod. The carrier member may be constructed o~ any material which is of sufficient rigidity and non-toxic when left in the root canal. One material that has been employed successfully is stainless steel. A plastic or aluminum carrier member also works successfully.
The carrier member incorporates a matte finish, or radial ribbing or helixes to provide adhesion surfaces for the gutta-percha and to serve as a mechanical piston to assist in forcing the gutta-percha into the canal.
In one embodiment the tip of the carrier member that is intended for the apex end of the canal incorporates a flat surface which is pointed at the extremity. The carrier member can thus be forced into the canal at a sufficient depth into the taper which then prevents the carrier member from being able to rotate in the canal. A
shaft of the carrier member has an area of lesser diameter than the normal diameter. This point of minor diameter or reduced torque resistance area is desi~ned to fail when a certain level of torque is applied to the handle of the carrier member. The flat on the extremity of the carrier member prevents rotation of the carrier member, thus the member will fail when a torque is applied to the handle.
The reduced torque resistance area is located at a specific point on the carrier member at the desired level in the canal. The portion of the carrier member shat above the reduced torque resistance area is of constant cross section (i.e. not ribbed) to facilitate removal of 1302i29 . . .
the member through the semi-rigid gutta-percha without pulling said gutta-percha out of the canal.
A disc-shaped washer is incorporated on the shaft o~
the carrler member and serves to act as a stopping plug at the coronal opening Or the canal and thus to prevent viscous flow ot the gutta-percha out of the said canal during the insertion process.
The gutta-percha is molded to the carrier member in a tapered or conically-shaped manner so as to facilitate the introduction into the typical canal taper with sufficient material to ensure complete filling of the said canal and thereby complete obturation of the canal.
The devices may be manufactured in a variety of sizes to correspond to standard endodontic files.
In using the tool of this invention the root canal is first prepared in the standard manner by broaching with endodontic tiles. The final file used in the apex preparat~on determines the proper gutta-percha device. A
carrier member o~ proper size is prepared with gutta-percha and the gutta-percha is heated over to the point at which the surface is glossy. The heated apparatus is then inserted into the root canal with firm apical force. The handle portion of the carrier member is the~ rotated while maintaining the apical force until torsional failure occurs.
The shank of the carrier member is then removed while holding the stopping plug or washer against the tooth and the remainder of the endodontic therapy is completed using conventional procedures.
For more information as to background material relating to the present invention reference may be had to pages 184 through 188 of the Journal of Endodontics, Volume 4, No. 6, June 1978 which describes a new gutta-percha technique in which the gutta-percha is formed around an endodontic file.
, ~3~2~29 65224-374 In summary, the present invention provides a tool for use in applying filler material, such as gutta-percha or the like, to an endodontically prepared root canal of a tooth, the canal extending from the tooth coronal area to the root apex, comprising: an elongated shaft formed of material having high biological tolerance, the shaft having a distal end portion and a proximal end portion and being of length such that the distal end is positionable adjacent the tooth root apex when the tool is inserted into a root canal, and the shaft having an integral surface configuration adaptable to retain filler material thereon;
and the proximal end portion forming a handle portion, the distal portion of said shaft being adaptable to receive filler material formed thereon and being insertable into an endodontically prepared root canal and the handle proximal end portion being severable from the distal portion to thereby retain the distal portion and filler material within the root canal.
A better understanding of the invention will be had by reference to the following description and claims, taken in conjunction with attached drawings.
~, ,.~, ~302129 Description of the Drawings Pigure 1 is an enlarged elevatlonal view of the tool, or carr~er member of the present invention. The tool includes a slidable stopper or washer which is shown in cross-section.
Pigure 2 is an elevstional view as in Pigure showing the lower portion of the tool as encapsulated in a conically-shaped quantity of filler material, such as gutta-percha. As shown in ~igure 2 apparatus is ready for use in filling an endodontically prepared root canal.
Figure 3 shows a tooth in cross-section with the root canal having been endodontically prepared and showing the appliance of this invention, in reduced scale, as being employed to apply filler material to one of the endodontically prepared roots.
Pigure 4 is a cross-sectional view of the tooth as in Pigure 3 showing the appliance inserted into the root canal.
Figure 5 shows the next step in a sequence of applying filler material to the root canal wherein the tool has been rotated to sever the proximal portion form the distal portion.
Figure ~ shows the removal of the proximal portion of the tool with the distal portion being retained in the root canal with the filler material.
Fi~ure 7 is an elevational view of an alternate embodiment of the tool of ~igure I in which the shaft of the tool has a matte surface finish.
Pigure 8 is an elevational view of an additional alternate embodiment substantially that of Pigure 7 but wherein the shaft includes spaced circumferential identations.
Pigure 9 is an elevational view of an embodiment as in Figure 7 and 8 wherein the shaft includes spaced indentations which are relatively narrow compared to the indentations of Pigure 8.
-` 1302~29 `
~ Igure 10 is an elevational view of a still different embodiment lncluding spaced enlarged di~meter portions on the shaft.
Detailed Description of the Preerred Embodiment Referring to the drawings, and first to Figure 1, the tool which is a carrier member, iY generally indicated by numeral 10 and is formed of an elongated shaft 12 having a proximal end 14 and distal end 16. While the shaft may be of a variety of cross-sectional configurations the preferred and simplest shape is that of a circular cross-sectional configuration as illustrated. At the proximal ends 16 the shaft is flattened or flared at 18 into a non-circular cross-sectional configuration so that when the shaft is positioned in a root canal of a tooth, as will be hereinafter more specifically described, the flared end portion 18 resists rotation of the shaft. Integrally formed on the shaft are a plurality (three being shown) of spaced apart enlarged cross-sectional dimensioned portions 20A through 20C. When the shaft is circular cross-sectional as preferred, the enlarged diameter portion 20A, 20B and aoc are also preferably an enlarged circular cross-sectional configuration. Instead of spaced apart enlarged cross-sectional portions, an alternate arrangement, not illustrated, includes integral spiraled portions extending frorn the shaft body.
Positioned between the enlarged diameter portion 20A, and the proximal end 14 is a reduced torque resistance area 22. This is in the form, as shown, of a groove formed around the shaft. Between groove 22 and the proximal end 14 is a sliding stopper or washer 24 having an opening 24A therein which slidably receives shaft 12.
Affixed to the shaft at the proximal end 14 is a handle portion 26.
Handle 26 is of a diameter larger than that of a shaft 12 and may be integral with the shaft or is secured to the shaft and made of a material such as plastic.
Pigure 2 shows the appliance ready for use in inserting a filler material, such as gutta-percha into the root canal of an endodontically prepared tooth. Pigure 2 '~' ~302~29 shows, in cross-section, filler material 28 formed on the tool 10. The filler material 28 may be such as gutta-percha which can be rormed by hand onto tool 10. After forming, the gutta-percha may be warmed in a flame to the proper stage.
~ igure 3 shows a tooth 30 having root canals 32 and 34 therein. A canal 3a has been endodontically prepared in the standard technique such as by the use of files to remove the root pulp and to prepare, as well as possible, a clean canal. The appliance formed of tool 10 with the filler material 28 molded thereon is ready for use for filling the root canal 32. The apex of the root canal is indicated at 36 with the tooth crown or coronal portion being indicated by numeral 38.
~ igures 4 through 6 show the continuation of the step of filling root canal 32. ~igure 4 shows the appliance inserted into the canal 32. The filler material 28 is forced by the insertion of the appliance to fill the canal to the apical area 36 of the tooth. Arter full ;nsertion of the appliance as shown in Figure 4, rotational torque is applied to handle 26, severing the shaft at the reduced torque resistance area 22 as shown in ~igure 5. This is possible since the flared distal end 18 of the shaft resists rotation relative to tooth 30.
After the shaft has been severed into two portions, the proximal portion is withdrawn. The sliding washer 24 is used to retain the filling material 28 in the canal by holding the washer downwardly as the proximal end portion of the shaft 12 is withdrawn.
~ igure 6 shows the proximal portion Or the tool being withdrawn. Washer 24 is then removed, leaving the distal portion of the shaft in place within the root canal 32.
The root canal 32 can be more completely filled by applying additional filler material and by applying mechanical or hydraulic pressure to the filler material to 30;~129 force it into the root canal. The coronal area of the tooth can be filled in the usual way.
The depictlon Or the tooth 30 in Pigures 3 through 6 is merely exemplary as teeth are individualistic and the drawings are intended to exemplify the steps involved rather than to accurately pictorially represent the appearance of the tooth or root canal therein.
The invention, thus, provides an unique and very effective way of conveying filler material, such as gutta-percha, into an endodontically prepared root canal. The prior art teaches the use of a file as a carrier of filler material, however, this known method, while functioning successfully for its intended purpose, nevertheless has limitations and problems which are overcome by the present invention.
Pigure 7 through 11 show a family of alternate embodiments of the invention preferablv formed ot plastic material. The shaft 12 i8 of elongated tapered shape in which the distal end 16 is slightly rounded. The handle 26A is integrally formed with the shaft and, as indicated in Figure 11, may be of non-circular cross-section, such as square as shown. Obviously, the handle may be also of hexagonal or other shspes which permits the tool to be manipulated by the endodontist.
The externsl surface of the shaft 12 of Figure 7 is preferably formed with a matte finish so that filler material formed thereon, such as in Figure a, will be secured to the shaft lor insertion into an endodontically prepared root canal. While a sliding washer is not shown in the embodiments of Pigures 7 through 10 it is apparent that a washer can be utilized in the same way as illustrated in Pigures 1 through 6.
The embodiment of Pigures 7 through 10 does not include a flared end as with the embodiment of Pigures I
and 2, however, the lower portion of the shaft can be severed alter insert;on into a root canal by the provision ~30æ~29 of cuts 40 formed in the shaft. The cuts 40 are equivalent to the reduced diameter portion ~2 of ~igures 1 and 2 and provide a stress point. Atter the shaft is inserted into a root canal, the lower portion may be sparated from the upper portion by moving the upper portion back and forth relative to the tooth in which the lower portion is positioned to break the shaft at cut 40.
Pigures 8 and 9 show the embodiment of ~igure 7 but with spaced apart, reduced diameter recesses 42 therein.
In Figure 8 the recesses 42 are rather wide with a curved circumferential bottom surface whereas in ~igure 9 the recesses 42A are much narrower. This illustrates that the shape, size and spacing of the recesses may vary.
Pigure 10 shows an embodiment including integral enlarged diameter portions 44. These portions are semicir¢ular in external configuration as compared with the cylindrical configurations of the enlsrged diameter portions 20A through aoc as shown in ~igures 1 and 2. The enlarged diameter portions 44 serve to help retain tiller material on the shaft while it is being inserted into a root canal.
The alternate embodiments of Figures 7 through 10 illustrate the fact that the tool may take a variety of configurations, each of which is within the purview of the invention and each of which serves the function of permitting more ready and effective insertion of filler material into an endodontically prepared root canal.
The claims in the specification describe the invention presented and the terms that are employed in the claims draw their meaning from the use ot such terms in the specification. The same terms employed in the prior art may be broader in meaning than specifically employed herein. Whenever there is a question between the broader definition of such terms used in the prior art and the more specific use of the terms herein, the more specific meaning is meant.
While the invention has been described with a certain degree of particularity it is manifest that many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. It is understood that the invention is not limited to the embodiments set forth herein for purposes of exemplification, but is to be limited only by the scope of the attached claim or claims, including the full range of equivalency to which each element thereof is entitled.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tool for use in applying filler material, such as gutta-percha or the like, to an endodontically prepared root canal of a tooth, the canal extending from the tooth coronal area to the root apex, comprising:
an elongated shaft formed of material having high biological tolerance, the shaft having a distal end portion and a proximal end portion and being of length such that the distal end is positionable adjacent the tooth root apex when the tool is inserted into a root canal, and the shaft having an integral surface configuration adaptable to retain filler material thereon;
and the proximal end portion forming a handle portion, the distal portion of said shaft being adaptable to receive filler material formed thereon and being insertable into an endodontically prepared root canal and the handle proximal end portion being severable from the distal portion to thereby retain the distal portion and filler material within the root canal.
an elongated shaft formed of material having high biological tolerance, the shaft having a distal end portion and a proximal end portion and being of length such that the distal end is positionable adjacent the tooth root apex when the tool is inserted into a root canal, and the shaft having an integral surface configuration adaptable to retain filler material thereon;
and the proximal end portion forming a handle portion, the distal portion of said shaft being adaptable to receive filler material formed thereon and being insertable into an endodontically prepared root canal and the handle proximal end portion being severable from the distal portion to thereby retain the distal portion and filler material within the root canal.
2. A tool according to claim 1 wherein said handle portion is enlarged dimensionally.
3. A tool according to claim 1 wherein the surface configuration on said shaft distal end portion is in the form of a matte finish.
4. A tool according to claim 1 wherein said shaft includes integral, spaced apart, enlarged diameter portions on the distal end portion.
5. A tool according to claim 1 wherein said elongated shaft includes integral, spaced apart, reduced diameter portions on the distal end portion.
6. A tool according to claim 1 wherein said shaft has a cut therein between the distal and proximal end portions, the cut forming a point of weakness whereby the proximal end portion of the shaft may be broken from the distal end portion.
7. A tool according to claim 1 wherein said distal end is non-circular in cross-section whereby the proximal end handle portion may be severable from the distal end portion by the application of rotary torque to the proximal end handle portion.
8. A tool according to claim 1 including filler material formed about the distal end portion, the filler material being shaped and dimensioned for insertion by said shaft into an endodontically prepared tooth root canal.
9. A tool according to claim 1 including a reduced diameter area in said shaft between said proximal end portion and said distal end portion, the reduced diameter area providing means to facilitate the severability of said distal portion from said proximal portion.
10. A tool according to claim 2 wherein said handle portion is formed in part by a material different from said shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000563877A CA1302129C (en) | 1988-04-12 | 1988-04-12 | Tool for use in applying filler material to an endodontically prepared root canal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000563877A CA1302129C (en) | 1988-04-12 | 1988-04-12 | Tool for use in applying filler material to an endodontically prepared root canal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1302129C true CA1302129C (en) | 1992-06-02 |
Family
ID=4137811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000563877A Expired - Lifetime CA1302129C (en) | 1988-04-12 | 1988-04-12 | Tool for use in applying filler material to an endodontically prepared root canal |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1302129C (en) |
-
1988
- 1988-04-12 CA CA000563877A patent/CA1302129C/en not_active Expired - Lifetime
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| MKEX | Expiry |