Dental implant system

Abstract

A dental implant and final prosthetic placement system for small-diameter implants (and method for using the system) in which a final prosthetic is digitally designed and created, and is itself used as the drill guide to place the implants. The final prosthetic is held in the predetermined proper drilling position by a stent, such as an occlusal guard. The combination of final prosthetic (with holes through which the small-diameter implants are drilled to secure it) and the stent encasing the final prosthetic, is itself the drill guide.

Claims

1. A dental implant system, comprising: a first final prosthesis which contains two or more holes; a stent encasing the first final prosthesis, the stent being configured to hold the first final prosthesis in the proper drilling position; and, a plurality of small-diameter implants placeable through the two or more holes of the first final prosthesis, each of the small-diameter implants having a coronal end and an apical end, wherein, an implant head is provided at the coronal end with an at least partially threaded shank extending apically from the implant head to the apical end, an annular apically-facing shoulder is defined by the implant head radiating outwardly from the at least partially threaded shank, wherein the stent is configured to extend across a patient's dental arch to hold the first final prosthesis in the proper drilling position so that the plurality of small-diameter implants are drilled, with the apical ends leading, into the patient's gingiva and bone through the two or more holes to implant the small-diameter implants in the patient's gingiva and bone, wherein, the small-diameter implants are implanted (i) so that the implant heads of the small-diameter implants are spaced apart, (ii) so that the implant heads do not protrude from the first final prosthesis, (iii) so as to have longitudinal axes diverging away from one another in the direction of the apical ends, and (iv) so that the shoulders of the implant heads are in pressing contact with, recessed within, the first final prosthesis, thereby ensuring that the first final prosthesis is secured and cannot move freely relative to the patient's gingiva and bone.

2. A method of using a dental implant system to place dental implants, comprising; taking, using imaging equipment, a CT scan and intraoral digital scan of a patient's edentulous and surrounding area; using said CT and intraoral digital scans to determine the number and location of implants; using said CT and intraoral digital scans to create a first final prosthesis; encasing said first final prosthesis in a stent; providing a plurality of small-diameter implants, each of the small-diameter implants having a coronal end and an apical end, wherein, an implant head is provided at the coronal end with an at least partially threaded shank extending apically from the implant head to the apical end, an annular apically-facing shoulder is defined by the implant head radiating outwardly from the at least partially threaded shank; with the stent extending across a patient's dental arch and holding the first final prosthesis in the proper drilling position, drilling the small-diameter implants, with the apical ends thereof leading, through said first final prosthesis into the patient's gingiva (i) such that the implant heads of the small-diameter implants are spaced apart, (ii) such that the implant heads do not protrude from the first final prosthesis, (iii) such that the longitudinal axes of the small-diameter implants diverge from one another in the direction of the apical ends, and (iv) such that the shoulders of the implant heads come into pressing contact with, recessed within, the first final prosthesis; removing the stent, leaving the first final prosthesis in position secured to the patient's gingiva.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a view of the implant being drilled into the gingiva and engaging the acrylic stent.

(2) FIG. 2 is a side view of the final prosthesis and stent in place.

(3) FIG. 3 is a top view of the final prosthesis and stent in place.

DESCRIPTION

(4) FIG. 1 is a schematic illustration of a dental implant system in accordance with an embodiment of the present invention. The system involves both a final restoration drill guide 12 and a method for creating and using the drill guide. The method comprises taking a CT scan of the patient's edentulous and surrounding area; developing a laboratory model of the arch with missing teeth to be replaced in stone or some other solid material, the analog, the final prosthetic 10 and the stent 11; creating physical models of the stone, the analog, the final prosthetic 10 and the stent 11; placing the stent 11 in position on the patient; and drilling the final prosthesis 10 into the gingiva 14 with small-diameter implants. Small-diameter implants are understood in the art to mean implants with a diameter less than 3.2 mm. In some embodiments, the method further comprises cutting off the stent 11 after drilling in order to release the final prosthesis 10 in final position.

(5) Taking a CT scan of a patient's edentulous and surrounding area is well-known in the dental arts, as is the ability to develop first a laboratory model, and then a physical model of the arch, analog, and stent 11, using CAD/CAM technology. A major innovation of the present invention is the single article of manufacture which comprises a stent 11 made on the model, already supporting the final prosthesis 10. The stent 11 encases the final prosthesis 10, assuring that it cannot move freely.

(6) FIG. 2 is a side view of the final prosthesis 10 and stent 11 held securely in place. Together, this comprises the drill guide 12.

(7) Once the drill guide 12 is in final position on the patient, in some embodiments, single small-diameter implants 13 will be used to replace anterior and pre-molar teeth of about 3 mm diameter. In some embodiments, two about 2=implants 13 (collectively, small-diameter implants) will be used for each molar replacement (preferably distal and mesiolingual).

(8) The active (cutting) section 16 of the small-diameter implants 13 can be, for example, from 6 mm to 16 mm in length. Above this is the 3 mm gingival collar 18. Above this segment is the between 3 mm and 7 mm segment 20 with deeper threads that engage the final prosthesis. In some embodiments, the 5 mm segment 20 will have no threads, but will be smooth. Finally is the implant head 24 which is also 5 mm in height and may, for example, have a hollowed 4 mm deep internal hex pattern to accept the torque driver 26.

(9) In some embodiments, the tip of the active section 16 of the implants 13 will be covered with a 5 mm nylon sleeve, which does not touch the conical point of the tip as it narrows. This sleeve will be used as a drill guide for the implant 13, ensuring that it is introduced into the prosthetic with the proper inclination. The implant 13 will act as a screw to hold the prosthetic, and the stent 11 encases or is otherwise connected to the prosthetic. The sleeve then stays in place as the implant 13 advances into bone. After drilling, the sleeve acts as a stop for the head of the implant 13. The sleeve advances with the implant until it rests on a ledge/platform which halts its forward movement as the implant 13 proceeds into the bone, and then stops progression of the implant 13 when the implant head 24 rests on the sleeve's superior segment.

(10) This equates to single piece implants measuring, for example, between 21 mm and 29 mm. All measurements in the preceding paragraphs are by way of example only, and are not restrictive of the invention as claimed.

(11) In the invention described herein, two of the implants 13 can be parallel, and the others divergent, in order to prevent the stent 11 or final prosthetic 10 from moving freely, securing the implants in place. The prosthetic 10 is kept in place by the stent 11 as the implant 13 advances into the bone.

(12) In the foregoing description, various features are grouped together in a single embodiment for purposes of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the following claims are hereby incorporated into this description, with each claim standing on its own as a separate embodiment of the invention.

(13) Although the present invention has been described in considerable detail with reference to certain preferred versions thereof, other versions are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the preferred versions contained therein.