Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
2000-12-06
2001-11-13
Wilson, John J. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S169000
Reexamination Certificate
active
06315563
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to an enossal single tooth implant, which has a base member, which is inserted in a bore made in a jawbone and has a blind bore extending inward from one end, and an abutment for a crown or dental prosthesis having a centering collar inserted into the blind bore.
DE 195 34 979 C1 discloses a single tooth implant of this species wherein the positive lock region of the base member directly adjoins the coronal face wall thereof. The positive lock section of the abutment is provided essentially immediately following the shoulder of the abutment. Given this implant, moreover, a guide region with a larger diameter than that of the centering region is provided between the positive lock region and the centering region of the base member.
The single tooth implant of the species has in fact essentially proven itself, but it has turned out to be desirable to enhance the mechanical stability even more and, additionally, to simplify the fabrication.
It has also been shown that bacteria or the like can penetrate between the boundary surfaces of the base member and the abutment over the course of time. The recent desire for an effective “biological seal” between the inside of the implant and the oral cavity or, respectively, the gums has not been taken into account as desired, particularly for patients who are especially sensitive to taste and smell. For this reason, a noticeable taste arises, particularly when removing the abutment after having worn it for a longer time and some patients consider this unpleasant. Despite the precision in the working of the surfaces of the base member as well as of the abutment that is currently possible, there is still the problem of a sometimes inadequate seal between the inside of the implant, i.e. the implant chamber that accepts the cervical regions of the abutment and the abutment screw, and the oral cavity. Said seal is not only important to prevent a penetration of bacteria into the implant chamber from the outside but—insofar as bacteria have penetrated into the implant chamber—also because gram-negative, anaerobic bacteria that, insofar as they penetrate into the oral cavity, can easily lead to periodontal processes especially multiply there under the influence of body heat in the dark, anaerobic chamber atmosphere. Overall, thus, a seal of the implant chamber would be desirable in both directions, both from the inside to the outside and from the outside to the inside; this, however, has not yet been satisfactorily achieved in the known single tooth implant for the reasons discussed above.
DE 195 09 118 discloses a single tooth implant with which a mobility of the implant in the jaw or, respectively, jaw bone similar to a natural tooth is to be achieved. To this end, an elastic ring that lies against appertaining seating surfaces of the abutment for the crown and of the base member is inserted between the abutment and the base member. These seating surfaces are of such a nature that the ring is not covered at the outside by the base member and the abutment, so that the abutment can be displaced in the longitudinal direction of the implant and in the direction toward the oral cavity or away from the oral cavity opposite the elastic force of the ring.
SUMMARY OF THE INVENTION
The invention is therefore based on the object of creating a single tooth implant of the species initially cited that is simpler to fabricate.
According to a further aspect of the invention, a single tooth implant of the species initially described should be created wherein a dependable biological seal between the inside of the implant and its outside is assured.
This object is inventively achieved by an enossal single tooth implant for a tight-fitting dental prosthesis having an essentially cylindrical base member, which has a closed end that is insertable into a bore introduced in a jaw bone and comprises a blind bore open toward its coronal or one end and extending toward the closed end, and an abutment for a crown attachable to the coronal face wall of the base member secured against twisting. At a first end, the abutment has a cervical centering collar insertable into a hollow-cylindrical ring recess provided at the coronal end of the base member, and has a shoulder emplaceable onto the coronal face edge of the base member, which is arranged between the centering collar and a fastening head for the dental prosthesis. The abutment has a preferably through central bore for the acceptance of an abutment screw that preferably penetrates the abutment and can be directly or indirectly introduced into the blind bore of the base member. A connecting device for the twist-secured joining of the abutment to the base member is formed in that a positive lock region of the ring recess comprises at least one base member positive lock element acting in circumferential direction and the centering collar comprises at least one abutment positive lock element complementary to the base member positive lock element or elements. A centering region of the ring recess is arranged farther toward the closed end or cervically than the positive lock region. A circumferential guide surface or surfaces of the positive lock region lying closest to the longitudinal center axis of the ring recess lies or lie on a cylinder surface whose diameter is larger than that of the centering region, the abutment positive lock element or elements is/are provided farther cervically than the shoulder at the cylindrical outside wall of the centering collar in a positive lock section thereof, the circumferential surface or surfaces of the positive lock section lying closest to the longitudinal center axis of the centering collar lies/lie on a cylinder surface whose diameter essentially corresponds to that of the cylinder surface on which the circumferential guide surface or surfaces of the positive lock region lying closest to the longitudinal center axis of the ring recess lies or lie. A cylindrical centering section is arranged farther cervically than the positive lock section, the outside diameter thereof essentially coinciding with the inside diameter of the centering region, this being characterized in that the positive lock region is arranged with cervical spacing from the coronal face edge.
It is provided according to a specific embodiment that the centering region immediately cervically adjoins the positive lock region, and that the centering section immediately cervically adjoins the positive lock section.
This embodiment of the invention is based on the surprising perception that, given facilitation and simplification of the fabrication, one succeeds in improving the mechanical stability of the single tooth implant of the species in that the compulsory guide region of the Prior Art with an inside diameter corresponding to the positive lock region of the base member is omitted and the centering region is directly connected to the positive lock region. The intervention of a guide region with a smooth inside wall whose inside diameter corresponds to that of the positive lock region is thus foregone in the base member, so that the centering region with a reduced inside diameter compared to the positive lock region immediately follows the positive lock region in cervical direction.
The centering region can thereby be provided with an inside thread over its entire longitudinal extent. However, it can also be provided that the inside thread only extends over a part of the axial longitudinal extent of the centering region, whereby this part—for manufacturing reasons—preferably immediately adjoins the positive lock region. In that, in this case, a part of the axial longitudinal extent of the guide region, namely the part lying cervically distal or toward the closed end of the base member from the centering region, comprises a smooth, cylindrical inside wall whose inside diameter, of course, corresponds to that of the inside thread in the other part of the centering region, an enlarged seating surface derives between the centering section of the abutment and the base m
IMZ Fertigungs-und Vertriebsgesellschaft für dentale Technologie
Schiff & Hardin & Waite
Wilson John J.
LandOfFree
Single-tooth enossal implant does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single-tooth enossal implant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single-tooth enossal implant will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2602251