MXPA99000692A - System of assembly of top for graining denta - Google Patents

Abstract

A stop assembly (20) for a dental graft (50) has an axis extending longitudinally (12) with a first end (22), a second opposite end (24), and a peripheral surface (26). The stop assembly (20) is used to deliver the dental graft to a prepared size of the jaw with a graft drive tool (70), and is used to secure a dental prosthesis to the dental graft (50). The stop assembly includes a screw (40) or other fastener to secure the stop assembly (20) to the graft (50). A surface (32) is provided for securing the dental prosthesis to the stop assembly (20), adjacent the first end 22. A structure (28) for transferring rotational force of the dental graft drive tool (70) to the graft is provided. (50), through the stop assembly (20). A grafting equipment (10) includes a stop assembly (20), a graft (50) and a screw of

Description

"TOP MOUNTING SYSTEM FOR DENTAL GRAFTS" BACKGROUND OF THE INVENTION 1. FIELD OF THE INVENTION The present invention relates to skeletal grafts (such as dental grafts) and, more particularly, to a dental graft kit that provides a stop that also acts as a mount. 2. DESCRIPTION OF THE PREVIOUS TECHNIQUE Dental grafts are used to provide a platform to which a dental prosthesis can be secured to the underlying bone in the jaw or jaw of a dental patient. A typical root-shaped dental graft system employs a dental graft that is placed in a prepared site in the underlying bone. A disposable assembly is used to provide a connection with an insertion tool used to place the graft within the bone. If the graft is a threaded graft, the assembly is typically a removable graft extension to provide a hexagonal nut type surface for engagement with a plug used to screw the graft into the prepared site. Once the graft has been attached to the site, the assembly is removed and discarded. A cover screw is fixed in the upper part of the graft and the bone surrounding the prepared site is allowed to grow towards the graft for several months, thus ensuring the graft in the bone. Once the surrounding bone has sufficiently coupled the graft, the cover screw is removed and a copy of the impression is fixed on the graft. An impression of the graft is taken from the surrounding teeth and a dental prosthesis is constructed using the impression as a model of the area of the patient's mouth surrounding the graft site. The dental prosthesis is then fixed on the top with cement, or other means of fixation. In this way, the stop acts as a platform to ensure a dental prosthesis in the graft. The current method is wasteful and expensive because the assembly is discarded and a separate stop must be obtained.

COMPENDIUM OF THE INVENTION The present invention is a butt assembly for a dental graft, having an axis extending longitudinally with a first end, a second opposite end and a peripheral surface. The butt assembly is used to deliver the dental graft to a site prepared from a jaw with a graft drive tool and is also used as a device to secure a dental prosthesis in the dental graft. The butt assembly includes a screw, or other fastener to ensure butt assembly in the graft. A surface is provided for securing the dental prosthesis to the abutment assembly adjacent the first end. A structure is provided to transfer the rotational force from the graft drive tool to the graft through the butt assembly. In another aspect of the invention, a groove, defined by the peripheral surface of the butt assembly, is positioned circumferentially around the peripheral surface of the butt assembly, thereby providing a clamping surface for the cement used to fix the prosthesis. to the butt mount adjacent to the first end. Yet another aspect of the invention is a dental graft kit - for use with a graft drive tool. The case includes a dental graft having a crest end defining a first engaging surface. The case also includes a butt assembly, having a first end and a second opposite end, ~ and a peripheral surface, the second end defining a second engaging surface engageable coincident with the first engagement surface, defining the peripheral surface at a surface to be coupled with the graft drive tool. The case also includes a surface for securing the butt assembly in the dental graft, thereby providing a platform for attaching a dental prosthesis to the graft. -A further aspect of the invention provides a method for deploying and using a dental graft at the prepared site of a bone. The dental graft, which has a butt mount coupled with the dental graft that transfers any rotational force received for butt mounting to the dental graft, is placed within the prepared site. The rotational force is applied to the butt assembly with a graft drive tool, thereby rotating the dental graft within the prepared site. The butt assembly is removed from the dental graft for a preselected period to allow the growth of the bone in the dental graft, thereby fixing the dental graft in the bone. The butt assembly is reattached to the graft and then secured in the dental graft. A dental prosthesis is then fixed in the butt assembly.

- In yet another aspect of the invention, a longitudinal force is applied to the butt assembly with a tool for driving the graft, thereby driving the dental graft into the prepared site. An advantage of the invention is that the assembly used to drive the graft into the prepared site is also used as a stop to secure the prosthesis in the graft, thereby reducing the cost of grafting. Another advantage of the invention is that it provides a stop that can be secured in a printing material as part of a direct or indirect printing technique. These and other advantages will become apparent from the following description of the preferred embodiment taken along with the following drawings, although variations and modifications may be made without deviating from the spirit and scope of the novel concepts of the exhibition.

BRIEF DESCRIPTION OF THE DRAWINGS OF THE DRAWINGS Figure 1 is a detailed elevation view of a graft, a butt assembly, a screw-stop and a plug for coupling the stop assembly.

Figure 2 is a top front perspective view of a butt assembly and a plug. Figure 3 is a cross-sectional view of a graft case packed in a small bottle. Figure 4A is a partial cutaway elevation view of a first embodiment of a plug for use with a dental handpiece. Figure 4B is an elevational view of the plug of Figure 4A, coupled with a butt mount fixed to a graft. Figure 5 is a front elevation view of a second embodiment of a plug for use with a ratchet. Figure 6 is a top front perspective view of a graft and a butt assembly using an elongated screw as part of the direct printing technique.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A preferred embodiment of the invention will now be described in detail. Referring to the drawings, equal numbers indicate equal parts through the views. As used in the description herein and throughout the claims that will be given below, "a", "an" and "the" include multiple references unless the context clearly prescribes otherwise. In addition, as used in the description herein and through the claims that will be given below, the meaning of "in" includes "in" and "over" unless the context clearly prescribes otherwise. Likewise "in complementary form" usually means that it has compatible dimensions, without necessarily having an identical form. As shown in Figures 1 and 2, the case of the present invention, comprises a dental graft 50, a butt assembly 20 and a screw-stop 40. The dental graft 50 can be of one of several types, including dental graft in the form of a screw-type root. shown As shown, the dental graft 50, the stop assembly 20 and the stop screw 40 are all aligned along a common axis 12. The graft 50, the butt assembly 20 and the screw-stop 40 would be made of a material suitable for grafting applications, such as titanium alloy from the F-136 method of the American Society for the Testing of Materials, using a process of CNC machining. As will be apparent to a person skilled in the art, other materials and manufacturing processes can be employed without departing from the scope of the invention.

The butt assembly 20 has a first end 22, a second opposite end 24 and a peripheral surface 26. At least one engaging surface 28 of the drive tool is provided for engagement with the graft drive tool 70, such like a plug. The coupling surface 28 could be a flat bordel surface, as shown or any other form of the many types of drive tool coupling surface are commonly known in the art of a fastener design and implantology (e.g., an internal hex nut could be used to couple with an Allen wrench as a drive tool). The graft 50 includes a ridge end 52 and a first ridge coupling surface 54 adjacent the ridge end 52. The crest end 52 defines a first longitudinal opening 56 with internal threads to receive the stop screw 40 therein. The butt assembly 20 includes a second rotation coupling surface 30, which is complementary in shape to the first rotation coupling surface 54. The first rotation coupling surface 54 may be a male polygonal surface (such as a hexagonal boss) extending from the crest end 52, with the second rotation coupling surface 30 being a corresponding female coupling surface that is defined by the second end 24. Similarly, the first rotation coupling surface 54 could be a female polygonal surface, while the second rotation coupling surface 30 is a corresponding male polygonal surface. As will become apparent, many other types of mating surfaces (including non-polygonal surfaces) could be employed with satisfactory results. The butt assembly 20 may be provided with one or more grooves 32 that are defined by the peripheral surface 26, to provide an additional surface area in the butt assembly 20 to cement a dental prosthesis (not shown) therein, and for retaining the print material. Because the butt assembly 20 performs both butt fusion to ensure a prosthesis in the graft 50 and the function of an assembly to urge the graft 50 into the site of the prepared bone, the present invention avoids the cost of supplying an additional assembly not reusable. The butt assembly 20 is attached to the graft 50 with the screw-stop 40. The screw-stop 40 may include a head portion 44, a threaded portion 46 and an unthreaded alignment portion 48 for aligning the threads of the portion 46 threaded with the threads in the first longitudinal opening 56 of the graft 50. The head portion 44 defines an internal hexagonal opening 42 for receiving a hexagonal driver for screwing the screw-stop 40 into the first longitudinal opening 56 of the graft 50. The mounting 20 butt defines a second longitudinal opening 34 that passes therethrough to receive the screw-stop 40 therein. The second longitudinal opening 34 includes an enlarged upper part 36 which opens into the first end 22 and a restricted part 38 which opens out towards the enlarged upper part 36 opening towards the first end 22 and a restricted part 38 opening into the second rotational coupling surface 30. The enlarged upper part 36 has a diameter sufficient to receive the head portion 44 of the screw-stop 40, while the restricted part 38 has a diameter sufficient to receive the threaded portion 46 of the stop screw 40. The length of the enlarged piece 36 is such that the head portion 44 remains essentially flush with the first end 22 of the butt assembly 20, when the screw-stop 40 and butt assembly 20 are properly fixed in the graft. 50. As shown in Figure 3, the graft cassette 10, including the graft 50, the butt assembly 20 and the cover screw 40, can be shipped together in a package 80 comprising a small bottle 82 and a lid 84 The small bottle 82 can be made of plastic polymer - such as polyethylene, or any other suitable material commonly known in the art. At least one tongue 90 extends outwardly from the lid 84 to prevent rolling of the package 80 when placed on a flat surface. A retainer 88 extends from the center of the inner surface of the cover 84. The retainer 88 is configured to fit within the second longitudinal opening 34 of the mounting 20 to the stop, so that the retainers 88 retain the case 10 and prevent the graft threads 58 from touching the inner surface of the small bottle 82. This is especially important, because the threads can be coated with a coating such as an apatite compound. , which would become flakes and is touched by the small flask 82. The screw-stop 40 is retained in place, by means of a plastic seal 92 which is in a polygonal shape (eg having a hexagonal shape) to prevent the rolling of the retainer and stop screw 40 when placed on a flat surface. As shown in Figures 4A and 4B, in an embodiment designed to be used with a normal dental hand piece (not shown) the drive tool 70 used to drive the graft 50 includes a plug 74 defining an opening 76 that is complementary to the configuration a and that fits above the mounting 20 to the top. Extending upwardly from the socket 74 is an accessory 72, which engages with the dental handpiece. The accessory 72 shown herein is designed to be attached to a standard 1791-1 ISO dental manual part. In an alternative embodiment, which is shown in Figure 5, a drive tool 170 for use with a ratchet (not shown) can also be used. The drive tool 170 comprises a body portion 184"for engaging the pawl with a plug 174 extending down therefrom from a finger knurl 182 extending upwardly thereof A recess 180 is defined by the portion 184 of the body for receiving therein an o-ring 186. The grinding 182 of the finger can be provided to provide the implantologist or graftologist with the ability to start grafting by hand.The plug 174 defines a recess 176 which is complementary in shape to the The recess 176 can be provided with an O-ring 178 which acts as a spacer to allow the butt assembly to be easily disengaged from the plug 174. As shown in Figure 6, an elongated screw 190 can be supplied for use as a print pin in the direct printing technique.

The elongated screw 190 fits within the second longitudinal opening 34 of the stop assembly 20, and has a drive structure 192, such as an internal hexagonal structure for tightening and loosening the elongated screw 190. Upon taking an impression using the elongate screw 190, the impression material (not shown) is placed around the butt assembly 20 and the elongated screw 190 after the graft 50 has been driven towards the bone. The elongated screw 190 passes through the impression material and the tray, so tthe ejection structure 192 is not covered by the impression material. Once the impression material has solidified, the elongated screw 190 is removed from the graft 50, and the impression material and stop assembly 20 placed on its site is removed from the patient's mouth. The slots 32 in the butt assembly 20 provide a surface timproves retention by the recording material. A healing screw (not shown) is fixed in the graft 50. Even when the bone is holding or fixing the graft, a molding of the area around the graft 50 of the impression material is done. The butt assembly 20 can be adjusted within the molding, thereby allowing a dental prosthesis to be constructed with the butt assembly 20 providing a base with the same relation to - with respect to the mouth of the patient, as it will eventually have when permanently fixed in the graft 50. The engagement surface 28 of the driving tool provides a means for ensuring tthe orientation of the stop assembly 20 remains the same with respect to the graft. 50, at all times. This function could also be achieved by machining a mark on the stop assembly 20 to be used as a reference point. This ensures an almost exact fit between the prosthesis, the butt assembly 20 and the surrounding teeth of the patients. The aforementioned embodiments are provided as illustrative examples and are not intended to impose any limitation on the invention. It will be readily appreciated tmany deviations from the specific embodiments disclosed in this specification can be made without departing from the invention. Correspondingly, it is intended to protect all those modifications tare within the scope of this invention.

Claims (29)

- 1 - R E I V I N D I C A C I O N E S:

1. A butt assembly for a dental graft having a longitudinally extending shaft with a first end, a second opposite end and a peripheral surface, for supplying a prepared graft drive and a means for securing a prepared site of a jaw A dental prosthesis to the dental graft, the dental graft also has a longitudinal axis comprising: a. means for securing the stop assembly in the graft; b. means for fixing the dental prosthesis in the stop assembly adjacent to the second end; and c. means for transferring the rotation force from the graft drive tool to the graft through the butt assembly.

2. The butt assembly of claim 1, wherein the butt assembly tapers toward the first end, thereby forming a truncated cone.

The butt assembly of claim 1, wherein the graft has a crest end defining a first longitudinal opening, a portion of the opening that is threaded, and the butt assembly defines a second longitudinal opening that passes through of the same between the first end and the second end, and wherein the securing means comprises a screw that is capable of passing through the second longitudinal opening and that is engageable with the threaded portion of the first longitudinal opening in the graft.

The butt assembly of claim 1, wherein the graft has a first rotational engagement surface and the rotational force transfer means comprises: a. at least one bearing coupling surface to the graft drive defined on the peripheral surface of the butt assembly for engagement with the graft drive tool; and b. a second rotation coupling surface in the stop assembly adjacent the second end thereof and which is engageable coincident with the first rotation coupling surface in the graft, whereby when the graft drive tool imparts the rotation force on the coupling surface the graft drive tool, the second rotational engagement surface of the stop assembly imparts a rotational force on the first gravitational coupling surface of the graft to screw the graft into the prepared site.

5. The butt mount of claim 4, wherein the engaging surface of the graft drive tool is a chordal surface positioned on the peripheral surface of the stop assembly.

6. The butt assembly of claim 5, wherein the butt assembly has a longitudinal axis and the chordal surface is parallel to the longitudinal axis of the stop assembly.

7. The butt assembly of claim 5, wherein the chordal surface is not parallel with respect to the longitudinal axis of the butt assembly.

The butt assembly of claim 4, wherein the first rotation coupling surface is a first polygonal surface and the second rotation coupling surface is a second polygonal surface, complementary in shape to the first polygonal surface.

The butt assembly of claim 8, wherein the first polygonal surface is a male polygonal surface projecting from the crest end of the graft extending along the longitudinal axis of the graft, and the second polygonal surface is a defined aperture. by the second end of the butt assembly, the opening having an inner female polygonal surface complementary in shape to the male polygonal surface.

The butt assembly of claim 8, wherein the first polygonal surface is a female polygonal surface that extends along the longitudinal axis of the graft and the second polygonal surface is a male polygonal surface, complementary in shape to the surface polygonal female 11.

The butt assembly of claim 1, which furthermore comprises a means for indicating to a user an alignment of the assembly abutting the graft.

The butt assembly of claim 11, wherein the indicator means comprises a mark at a preselected location in the stop assembly so that the mark is in alignment with a geometric peculiarity of the dental implant, when the butt assembly is has properly coupled with the graft.

13. The butt assembly of claim 12, wherein the mark comprises a flat surface placed on the peripheral surface of the butt assembly.

14. A butt assembly for a dental graft having a longitudinally extending shaft with a first end, a second opposite end and a peripheral surface for delivery to a prepared site of a jaw, with a graft drive tool and a means to ensure a dental prosthesis in the dental implant, comprising: a. means to secure the butt assembly in the graft; b. a slot defined by the peripheral surface positioned circumferentially around the peripheral surface of the butt assembly, thereby providing a fixing surface for the cement used to fix the dental prosthesis in the butt assembly adjacent to the first end; c. means for transferring the rotation force from the graft drive tool to the graft through the butt assembly.

15. The butt assembly of claim 14, further comprising a means for taking an impression of the butt assembly.

16. A dental graft kit for use with a graft drive tool comprising: a. a dental graft having a crest end defining a first engagement surface; b. a butt assembly having a first end and a second opposite end, and a peripheral surface, the second end defining a second engagement surface that is engageable coincident with the first engagement surface, the peripheral surface defining a surface for engagement with the graft drive tool; and c. means for securing the butt assembly in the dental graft, thereby providing a platform for attaching a dental prosthesis to the graft.

The dental graft kit of claim 16, wherein the graft is a dental graft in the form of a screw and the first engagement surface and the second engagement surface comprise polygonal rotational engagement surfaces.

18. The dental graft kit of claim 17, wherein the graft has a longitudinal axis of rotation and the first engagement surface of the graft comprises a hexagonal protuberance concentric with the axis of rotation.

19. The dental graft kit of claim 18, wherein the second mating surface comprises a cavity defined by the second end of the abutment assembly, complementary in configuration to the hexagonal protrusion of the first mating surface.

20. The dental graft kit of claim 16, wherein the graft drive tool comprises: a. a means for fixing the driving tool in the driving mechanism; and b. a plug, connected with the attachment means engageable with the flat surface of the stop assembly.

The dental graft kit of claim 16, wherein the graft has a crest end defining a first longitudinal opening, a portion of which is threaded, and the abutment assembly defines a second longitudinal opening that passes through. of the same along the longitudinal axis and wherein the securing means comprises a screw that is capable of passing through the second longitudinal opening and is engageable with the threaded portion of the first longitudinal opening.

The dental graft kit of claim 16, wherein the stop assembly comprises a slot defined by the peripheral surface and positioned circumferentially around the peripheral surface of the stop assembly, thereby providing a fixing surface for the cement used to fix the dental prosthesis in the stop assembly.

23. A method for deploying and using a dental graft at the prepared site of a bone, comprising the steps of: a. placing the dental graft having a stop assembly coupled with the dental graft in order to transfer any rotational force received by the abutment assembly to the dental graft, within the prepared site; b. applying a rotational force to the butt assembly with a graft drive tool, thereby rotating the dental graft within the prepared site; c. removing the graft assembly from the dental graft during a preselected period to allow the growth of the bone within the dental graft, thereby fixing the dental graft in the bone; d. re-coupling the graft assembly in the graft and ensuring the graft assembly in the dental graft; and e. fix a dental prosthesis in the wrong assembly.

The method of claim 23, further comprising the step of taking a dental impression of the prepared site and the graft assembly. - 2

25. The method of claim 24, further comprising the step of taking an impression of the graft and an area adjacent to the assembly of a patient.

26. The method of claim 24, further comprising the step of preparing the dental prosthesis using the dental impression, so that the dental prosthesis fits with the butt assembly and the surrounding teeth once the graft is in place. prepared in the bone.

27. A method for deploying and using a dental graft at the prepared site of a bone, comprising the steps of: a. placing the dental graft, which has the graft assembly coupled with the dental graft in order to transfer any longitudinal force received by the abutment assembly towards the dental graft, within the prepared site; b. apply longitudinal force to the butt assembly with a graft drive tool thereby driving the dental graft into the prepared site; c. removing the graft assembly from the dental graft during a preselected period to allow the growth of the bone towards the dental graft, thereby fixing the dental graft in the bone; - d. re-coupling the graft assembly in the graft and ensuring the graft assembly in the dental graft; and e. Fix the dental prosthesis in the stop assembly.

28. The method of claim 27, further comprising the step of taking a dental impression of the prepared site and the abutment assembly.

29. The method of claim 28, further comprising the step of preparing the dental prosthesis using the dental impression, so that the dental prosthesis fits with the butt assembly and the surrounding teeth once the graft is in place. prepared site in the bone.