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Publication numberUS2721387 A
Publication typeGrant
Publication date25 Oct 1955
Filing date13 Jul 1953
Priority date13 Jul 1953
Publication numberUS 2721387 A, US 2721387A, US-A-2721387, US2721387 A, US2721387A
InventorsEdward S Ashuckian
Original AssigneeEdward S Ashuckian
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Artificial tooth
US 2721387 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Oct. 25, 1955 E. s. ASHUCKIAN 2,721,387

ARTIFICIAL TOOTH Filed July 13, 1953 lai- INVENTOR fbAW/RD 5 /4S//(/C/f//1/I/ BY MW TO RN EYS United States Patent ARTIFICIAL TOOTH Edward S. Aslluckian, Alameda, Calif.

Application July 13, 1953, Serial No. 367,457

3 Claims. v(Cl. 3210) The present invention relates to artificial teeth and in more particular to one which is adapted to be inserted in the socket of a tooth which has just been extracted so as to take the place of the extracted tooth, and to be retained in the position of the extracted tooth without bridging or other support from the proximal or other teeth in the denture. A further aspect of this invention is the process of establishing an artificial tooth in the alveolar process of a jaw.

There have been attempts to provide a substitute tooth which would fit in a socket but such efiorts have not been satisfactory because the replacement has not been nor become integrated in the bone structure of the jaw. If the substitute is not firmly in place, it willmove and work in the socket, enlarge and irritate the surrounding structure, and generally prove unsatisfactory.

Having in mind these defects of the prior art, it is an object of the present invention to devise an artificial tooth which may be firmly anchored in a tooth socket.

A further object of the present invention is the performance of a process of placing an artificial tooth in a tooth socket.

Another object of the present invention is the devising of a tooth root which after placing in a socket may be expanded to anchor it in place.

A still further object of the present invention is the construction of an artificial tooth root which when inserted in a tooth socket lends itself to ready, rapid, and firm integration with the surrounding structure.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawing accompanying and forming part of the specification. It is to be understood, however, that variations in the showing made by the said drawing and description may be adopted within the scope of the invention as set forth in the claims.

The above mentioned defects of the prior devices intended as inserts in the alveolar process in place of extracted teeth are remedied and these objects attained by the construction of an artificial tooth having one or more roots, as may be desired, which after insertion in a tooth socket immediately after extraction of the natural tooth therefrom are expandable transversely of the axis of the root so as to firmly engage the walls of the socket. .The outer surfaces of the inserted root are roughened to form outward projections and the walls formed with either deep depressions therein or holes therethrough so that immediately upon installation, expansion of the root will firmly establish the artificial tooth to preventsuch movements as would make impossible integration in the alveolar process while during healing the surrounding structure fills in these openings in the artificial tooth root to accomplish integration.

Five variations constructed in accordance with the above outline are hereinafterdescrbiedin detail, and.

Patented Oct. 25, 1955 ice these modifications are shown in the accompanying drawing, in which:

Figure l is a lingual elevational view of an artificial tooth embodying the present invention with parts of a surrounding socket as it would appear at the time of insertion of such tooth.

Figure 2 is an elevational section taken on the line, 22 of Figure 1.

Figure 3 is a transverse sectional view taken on the line 33 of Figure 2.

Figure 4 is an elevational view in full of the tooth root shown in Figures 1, 2, and 3.

Figure 5 is an elevational view of a tooth root having two branches, each of which is similar to the root shown in Figures 1 to 4, inclusive.

Figure 6 is an elevational section of the root shown in Figure 5, with a crown added thereto, and the tooth in place in an alveolar process, also, shown in section.

Figure 7 is a transverse elevational view through an illustrative alveolar process and tooth socket in which there has been recently installed an artificial tooth embodying another form of my invention.

Figure 8 is an elevational view, partly in section, of a tooth root embodying another form of the invention.

Figure 9 is a view in elevational section embodying a further modification of the invention of an artificial tooth root.

Figure 10 is a transverse sectional view on the line 1010 of Figure 9.

The particular embodiment of the invention shown in Figure 1 has as the principal parts of the tooth a crown 11 having therein a recess 12 adapted to receive a pin 13 which is integral with the root portion of the tooth. The pin is secured in the recess by a suitable cement. The view of Figure l is of the lingual surface of an incisor tooth, and so there is only one root portion, no branches. The root has a neck 14 that fills the entrance to the socket in the alveolar process 19 of the jaw. The gum, or gingiva, 20 covers the alveolar process and meets the neck of the crown 11 exteriorly of the neck 14 of the root. The root and the crown being joined adjacent the gingival surface.

Extending from the neck 14 of the root is the main part of the root which lies deep in the socket and is in the form of a V with a fixed leg 21 joined to the neck 14, the apex 22 of the V adjacent the bottom, or remote part, of the socket, and the free leg 23 of the V more or less parallel to the fixed leg 21. Each of the legs is formed with a thin wall shaped and rounded so that the two legs of the V are part of a hollow cone, shaped so that the outer surface conforms to the inner surface of the tooth socket. The outer surfaces of the root parts are roughened as by shearing and striking out small sections 24 of the walls of the root. Other openings 26 than those formed by the striking out of the sections 24 may be formed in the root walls. The purpose of these projections 24, or spurs, and openings 26 is to aid in firmly anchoring the artificial roots in the natural socket. When first inserted in the socket, the struck out sections 24 serve to firmly hold the tooth in place when the springy nature of the material and construction of the tooth root expand the legs 21, 23 away from each other and against the walls of the socket when inserted therein. Also, the spurs aid in retaining the root in the socket without crowding or damage to the lamina dura or other existing structure. The healing process will fill in the holes in the roots with tissue and eventually all of the unused parts of the socket to firmly anchor the tooth in place. Prior to extraction of the old tooth which the artificial one is to replace, X-rays of the old tooth should be taken to determine the shape and location of the root systemso that a properly shaped artificial tooth is at hand to replace the old one when it is extracted. A small amount of shaping of the root may be done by bending and trimming thereof, as by the removal of some of the V point 22 and edges of the legs 21, 23.

Figure 4 is an elevational full view of only the root of the tooth shown in the previous figures.

Using this structure and this process, there will be substituted for a natural tooth an artificial one that will be comfortable to the person and will in some respects be superior to the natural tooth. Further, it will be an artificial tooth which does not depend upon the proximal, adjacent teeth for support and retention, nor does the artificial tooth impose a load upon the adjacent teeth which tends to weaken them in their sockets.

Figures 5 and 6 show a modification of the previously described structure in which there are two branches of the root integral with a single neck for insertion in the socket of one of the back teeth. While only two branches are shown, it is obvious that three branches could be provided for replacement of those teeth having three branches to the root.

Figure 6 shows the complete tooth in place in the alveolar process 19 with the gingiva 2th contacting the neck of the crown 31 which is formed with a recess 32 to receive a pin 33 integral with the neck 34 of the root portion of the tooth. This neck 34 of the root has secured to and integral therewith two fixed legs 36, 37 which with the free legs 38, 39 form two Vs, each of which is inserted in a corresponding branch of a socket. These legs are formed with struck out projections 42 and holes 43 as in the preivously described form, as each branch is similar in form and construction to the single root branch of the previously described form.

Figure 7 shows a form of the invention adapted for a socket having a plurality of branches and is which at the time of insertion of the artificial branches there is no portion common to the branches. The modification of this figure has as its principal parts a crown portion 51 shown in elevational section to disclose the recesses 52 in its gingival surface in each of which is placed the head part 53 of a root branch portion of the tooth. In this modification each branch is V-shaped in form, one leg 54 having at its free end the head 53 to which the crown 51 is secured by suitable means such as a cement 56. The other, or free, leg 57 of the branch is free to move as it is joined to the head leg 54 only at the apex of the V. This root or branch may be constructed out of round wire or narrow strip and is of a cross sectional area that will allow the root when formed to be easily inserted in a tooth socket. The material used should have some resiliency so that the free ends of the V may be drawn together for easy insertion in the tooth socket, and so that after insertion the ends of the V may be released and the two legs will separate, or expand, under their spring action to press against the sides of the socket and root opening. The surface of the inserted root legs 54, 57 is roughened so that it will have projections 58 which will engage the lamina dura and the bone structure 19 of the alveolar process which surrounds and forms the tooth socket but will allow the healing growth of tissue around the root inserts.

The artificial root, roots, or branches are inserted in the socket upon extraction of the natural tooth and the healing processes will soon fill in the remaining opening of the socket and more firmly anchor the roots in place. This anchoring is facilitated by the roughness and irregularity of the inserted material and by the tapering shape of the V of the root and the transverse opening between the legs 54, 57 thereof. The outward expansion of each root branch embeds the projections in the lamina dura and holds the root firmly in place during the healing process so that there is no movement of the root which would prevent proper healing and integration of the root with the surrounding material.

The crown S1 of the tooth may be added after the healing process has been well advanced or completed. The process of adding such crown may be the same as that used in the application of a crown to the neck of a natural tooth, the taking of an impression to locate the positions of the heads 53 of the roots and the shaping of the crown with regards to the gums 20, or gingival tissues, and the type of tooth being replaced, and the cementing of the crown in place on the heads of the roots.

Other forms of the invention are shown in Figures 8, 9 and 10 wherein the alveolar process and gingiva forming the tooth socket would be similar to that shown in Figures 5 and 1, respectively. Also, as in the previous forms, a crown portion having a recess in its gingival surface is secured by cement to the upper, or neck, end of one or more artificial roots.

The modification shown in Figure 8 has a pin 63 adapted to fit in a recess in a crown which will then contact the gingival surface of the neck 64 of the root. Secured across the neck portion from the pin 63 are two root branches 66, 67 which are thin walled, outwardly convex, and taper from the neck portion to the tip of each root. When the roots are inserted in a socket, the form and springiness of the material will cause the roots to press outwardly of each other and against the walls of the socket to hold the roots and the tooth firmly in position. The holding power of the roots is increased by the outwardly struck projections 68 distributed over the outer surfaces of the roots, which projections will embed in the socket walls. Openings 69 in the root walls aid in the integration of the roots with the alveolar process during the healing of the socket.

The root portion shown in elevational section in Figure 9 has only one branch. The pin 73 which is adapted to be secured in a recess in the gingival surface of a crown, and the neck 74 of the root are provided with an opening 76 extending therethrough longitudinally and having placed therein a screw threaded stem '77 with a head 78 secured to an end projecting above the free end of the pin 73 so that the underside of the head rests on the free end of the pin 73. The screw threads of the stem 77 co-operate with a transversely elongated nut 78 that has its narrower ends 79, 80 guided in slots 81, 82 in the opposed longitudinal parts 83, 84, or legs, formed by the bifurcation of a portion of the root. The slots 81, 82 and the opposed parts 83, 84 are so formed that the slots diverge from the neck 74 to the tip of the root, and the placing of portions 79, 80 of the nut 78 in the slots 81, 82 prevents turning of the nut with the stem and forces apart the legs 83, 84 of the root when the nut is moved toward the neck of the root.

Figure 10 shows the sectional form of the legs 83, 84. The legs are formed with outward projections 86 and openings 87 similar to those found in the other modifications, and used for the same purposes. The spurs 86 not only project into the lamina dura to anchor the tooth root when first inserted in a socket, but they serve to space the greater part of the root from the walls of the socket.

This construction, illustrated in Figures 9 and 10, provides positive means for expanding a root so that it will be held in a tooth cavity.

The root portions of these artificial teeth may be constructed of tantalum, chrome cobalt iron alloy, or other suitable material which is tolerant to the tissues which it will contact. The crowns may be made of porcelain, or suitable plastic material.

What is claimed is:

1. An artificial tooth comprising a root portion and a crown portion, means for securing said root portion to said crown portion, said root portion being formed as a generally bifurcated member with an apex thereof being downwardly directed, said member being formed of resilient material whereby the bifurcations of said member may be urged inwardly towards each other, and

said member being provided with a plurality of projections extending from the surface thereof.

2. An artificial tooth comprising a root portion and a crown portion arranged to be secured together, said root portion having a substantially solid portion adjacent said crown and a pair of generally parallel spaced elements extending downwardly therefrom, each of said elements being provided with an oppositely disposed loop portion with the distal ends thereof directed towards said crown,

and said loop portions and said elements being movable 10 relative to each other in planes generally normal to the longitudinal axis of said tooth.

3. An artificial tooth as set forth in claim 1 in which a plurality of perforations are provided in said member 5 extending to the outer surface thereof.

References Cited in the file of this patent FOREIGN PATENTS 617,412 France Nov. 20, 1926

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
FR617412A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2857670 *16 Apr 195628 Oct 1958Kiernan Jr Thomas FIndividual tooth implant
US3343263 *14 Jun 196526 Sep 1967Richard E HenlotterArtificial tooth
US3497953 *1 Nov 19683 Mar 1970Weissman BernardDental prosthetic structure holding device
US3577853 *22 Jul 196911 May 1971Roberts Harold DDental implant and method of mounting the same
US3683501 *12 Feb 197115 Aug 1972Alfred E EdelmanAdapter for dental implants
US3708883 *4 Jan 19719 Jan 1973Flander SDental implant and method for using the same
US3729825 *2 Aug 19711 May 1973Oratronics IncOral implant
US3798771 *25 Jun 197126 Mar 1974A EdelmanWide blade dental implant
US3848273 *29 Jan 197319 Nov 1974Sulzer AgShank for bone implants
US3849888 *19 Oct 197326 Nov 1974Oratronics IncBone adapting tissue packing post system
US3866321 *2 Jan 197418 Feb 1975Valen MauriceCrown and bridge prefabricated system and implant
US3928914 *25 Aug 197130 Dec 1975Isaac M KozlovskyEndosseous implant for prosthetic teeth
US4177562 *2 May 197711 Dec 1979Miller Alvin LDental implant and method of inserting the same
US4220712 *6 Mar 19782 Sep 1980Pantomedical Grifo S.A.S.Dental implant and method of inserting
US4331423 *9 Mar 198125 May 1982Yanney Jr James F MMethod and apparatus for connecting an artificial tooth portion to a dentin portion
US4573922 *13 Jan 19844 Mar 1986Bello Lino LArtificial endo-osseous pillar for supporting fixed prosthetic members
US4744753 *20 Oct 198617 May 1988Ross Systems CorporationMethods for forming dental prosthesis
US4854873 *13 Oct 19878 Aug 1989Hall Surgical Division Of Zimmer, Inc.Oral implant
US4886456 *10 May 198812 Dec 1989Ross Systems CorporationMethods for forming dental prosthesis
US5004421 *27 Jul 19902 Apr 1991Sargon LazarofDental implant and method of using same
US5087199 *24 Dec 199011 Feb 1992Sargon LazarofDental implant and method of using same
US5342199 *8 Oct 199330 Aug 1994Imtec CorporationCylindrical dental implant
US5370695 *2 Apr 19936 Dec 1994Sulzer Medizinaltechnik AgMetal shank
US5447435 *6 Jun 19945 Sep 1995Brodbeck; UrsDevice for the reconstruction of teeth
US5470230 *30 Sep 199428 Nov 1995Daftary; FereidounAnatomical dental implant with expandable root
US5489210 *13 May 19946 Feb 1996Hanosh; Frederick N.Expanding dental implant and method for its use
US5611688 *11 May 199518 Mar 1997Hanosh; Frederick N.Expanding dental implant and method for its use
US5766009 *20 Jan 199516 Jun 1998Jeffcoat; Robert L.Elastically stabilized endosseous dental implant
US5931674 *9 Dec 19973 Aug 1999Hanosh; Frederick N.Expanding dental implant
US5947732 *29 Aug 19977 Sep 1999Implant Innovations, Inc.Support post for use in dental implant system
US5989026 *26 Oct 199823 Nov 1999Implant Innovations, Inc.Ceramic two-piece dental abutment
US6129763 *12 Sep 199710 Oct 2000Chauvin; Jean-LucExpandable osteosynthesis cage
US6152737 *23 Mar 199928 Nov 2000Implant Innovations, Inc.Support post for use in dental implant system
US61684354 May 19992 Jan 2001Implant Innovations, Inc.Ceramic dental abutments with a metallic core
US622786023 Nov 19998 May 2001Twenty One Inc.Dental implant
US6315561 *4 Feb 199813 Nov 2001Alfred RansmayerTooth root implant
US6332778 *14 Feb 200025 Dec 2001Pill-Hoon JungImmediately loadable expanding implant
US63439304 Oct 20005 Feb 2002Implant Innovations, Inc.Ceramic dental abutments with a metallic core
US63719895 Jun 200016 Apr 2002Jean-Luc ChauvinMethod of providing proper vertebral spacing
US688707716 Aug 20023 May 2005Implant Innovations, Inc.Immediate load dental implant system and method of use
US6962574 *13 Jun 20038 Nov 2005Biomet Manufacturing Corp.Therapeutic agent delivery device
US7530810 *30 Aug 200612 May 2009Clement Milton ADental fixture implantation system and associated method
US782884816 Apr 20029 Nov 2010Wenzel Spine, Inc.Expandable osteosynthesis cage
US80338263 Nov 200811 Oct 2011Biomet 3I, LlcTwo-piece dental abutment system
US807531230 Aug 200613 Dec 2011Zimmer Dental, Inc.Dental implant with improved osseointegration features
US82313872 Jul 200831 Jul 2012Zimmer, Inc.Porous implant with non-porous threads
US842523012 Sep 201123 Apr 2013Biomet 3I, LlcTwo-piece dental abutment system
US843529921 Sep 20107 May 2013Wenzel Spine, Inc.Expandable osteosynthesis cage
US8454362 *16 Oct 20064 Jun 2013Natural Dental Implants AgCustomized dental prosthesis for periodontal- or osseointegration, and related systems and methods
US8529261 *27 Feb 200710 Sep 2013Denta Vision GmbhDental implant system and method for implantation and construction of the implant system
US85623462 Jul 200822 Oct 2013Zimmer Dental, Inc.Dental implant for a jaw with reduced bone volume and improved osseointegration features
US85623482 Jul 200822 Oct 2013Zimmer Dental, Inc.Modular implant with secured porous portion
US860278019 Apr 201010 Dec 2013Natural Dental Implants, AgCustomized dental prosthesis for periodontal or osseointegration and related systems and methods
US860278224 Nov 200910 Dec 2013Zimmer Dental, Inc.Porous implant device with improved core
US879040716 Apr 201329 Jul 2014Liliane AttaliExpandable osteosynthesis cage
US881456730 Aug 200726 Aug 2014Zimmer Dental, Inc.Dental implant prosthetic device with improved osseointegration and esthetic features
US88518918 Dec 20117 Oct 2014Zimmer Dental, Inc.Expandable bone implant
US888848621 Sep 201118 Nov 2014Biomet 3I, LlcDental abutment system
US889998127 Aug 20132 Dec 2014Zimmer Dental, Inc.Dental implant for a jaw with reduced bone volume and improved osseointegration features
US88999822 Jul 20082 Dec 2014Zimmer Dental, Inc.Implant with structure for securing a porous portion
US899262116 Apr 201331 Mar 2015Liliane AttaliExpandable osteosynthesis cage
US906677127 Aug 201330 Jun 2015Zimmer Dental, Inc.Modular implant with secured porous portion
US909539630 Jul 20124 Aug 2015Zimmer Dental, Inc.Porous implant with non-porous threads
US91493452 Jul 20086 Oct 2015Zimmer Dental, Inc.Multiple root implant
US93143484 Jun 201519 Apr 2016Wenzel Spine, Inc.Bilaterally expanding intervertebral body fusion device
US943973819 Sep 201313 Sep 2016Zimmer Dental, Inc.Porous implant device with improved core
US953906228 Sep 201110 Jan 2017Natural Dental Implants, AgMethods of designing and manufacturing customized dental prosthesis for periodontal or osseointegration and related systems
US966218617 Dec 201330 May 2017Nobel Biocare Services AgDental component with metal adapter
US966883317 Dec 20136 Jun 2017Nobel Biocare Services AgAbutment and method of attaching an abutment to a dental implant
US970705810 Jul 200918 Jul 2017Zimmer Dental, Inc.Patient-specific implants with improved osseointegration
US970709518 Apr 201618 Jul 2017Wenzel Spine, Inc.Bilaterally expanding intervertebral body fusion device
US971757116 Oct 20141 Aug 2017Biomet 3I, LlcDental abutment system
US97440072 Sep 201429 Aug 2017Zimmer Dental, Inc.Expandable bone implant
US20020116066 *16 Apr 200222 Aug 2002Jean-Luc ChauvinExpandable osteosynthesis cage
US20030036036 *16 Aug 200220 Feb 2003Porter Stephan S.Immediate load dental implant system and method of use
US20040161725 *13 Feb 200319 Aug 2004Clement Milton A.Dental implantation system, support, and related methods
US20050042574 *3 Oct 200324 Feb 2005Sargon LazarofBipolar implant
US20050084820 *17 May 200421 Apr 2005Arthur AshmanImmediate post-extraction implant
US20060105295 *28 Jan 200518 May 2006Woodwelding AgImplant that can be implanted in osseous tissue and method for producing said implant corresponding implant
US20060154203 *10 Jan 200513 Jul 2006Emanuelli Silvio FDental implants having anatomical emergence
US20060194171 *29 Apr 200631 Aug 2006Sargon LazarofBi-polar implant
US20060241774 *7 Jun 200626 Oct 2006David AttaliApparatus for providing proper vertebral spacing
US20070015110 *24 May 200618 Jan 2007Zimmer Dental, Inc.Prosthetic dental device
US20070202465 *27 Feb 200730 Aug 2007Denta Vision GmbhDental implant system and method for implantation and construction of the implant system
US20070264612 *23 Nov 200415 Nov 2007Mount K TDental implant and method for making and installing same
US20080057472 *30 Aug 20066 Mar 2008Clement Milton ADental fixture implantation system and associated method
US20080090208 *16 Oct 200617 Apr 2008Natural Dental Implants GmbhCustomized dental prosthesis for periodontal- or osseointegration, and related systems and methods
US20090029313 *25 Jul 200729 Jan 2009Cheng Yih Trading Co., Ltd.Simplified implant cap for tooth implant
US20100203478 *19 Apr 201012 Aug 2010Natural Dental Implants, AgCustomized Dental Prosthesis for Periodontal or Osseointegration and Related Systems and Methods
US20110009972 *21 Sep 201013 Jan 2011Jean-Luc ChauvinExpandable osteosynthesis cage
US20110143313 *18 Feb 201016 Jun 2011Cheng-Hsien TsaiDental implant device
US20120064485 *9 Sep 201015 Mar 2012Hankookin, LLCFabrication And Installation Of A Dental Implant
US20140038134 *27 Jan 20136 Feb 2014Hao NguyenCustom dental implants, systems, devices and methods
US20150134063 *2 Oct 201414 May 2015Renovis Surgical Technologies, Inc.Surgical implant devices incorporating porous surfaces and a locking plate
USD7838225 Feb 201611 Apr 2017Silvio Franco EmanuelliRoot part for a dental implant
USD7838235 Feb 201611 Apr 2017Silvio Franco EmanuelliPost part for a dental implant
USD7838245 Feb 201611 Apr 2017Silvio Franco EmanuelliRoot part for a dental implant
USD7838255 Feb 201611 Apr 2017Silvio Franco EmanuelliPost part for a dental implant
USD7838265 Feb 201611 Apr 2017Silvio Franco EmanuelliRoot part for a dental implant
USD7851795 Feb 201625 Apr 2017Silvio Franco EmanuelliPost part for a dental implant
USD80276728 Feb 201714 Nov 2017Silvio Franco EmanuelliRoot part for a dental implant
USRE372274 Sep 199712 Jun 2001Implant Innovations, Inc.Device for the reconstruction of teeth
EP0114955A1 *12 Nov 19838 Aug 1984Francesco CaraccioloUniversal pin for oral implantoprosthesis
EP1004280A123 Nov 199931 May 2000Twenty One Inc.Dental Implant
WO1995031152A1 *10 May 199523 Nov 1995Hanosh Frederick NExpanding dental implant and method of use
WO2010053767A1 *28 Oct 200914 May 2010Zimmer Dental Inc.Expandable bone implant
U.S. Classification433/173
International ClassificationA61C8/00
Cooperative ClassificationA61C8/0033, A61C8/0018, A61C8/0036
European ClassificationA61C8/00F9, A61C8/00F7, A61C8/00F