Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
2000-10-20
2001-10-30
Wilson, John J. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
Reexamination Certificate
active
06309220
ABSTRACT:
Through neglect or injury a tooth lost from the anterior maxillary or jaw will result in the loss of supporting bone through resorption. Subsequent attempts to install a secure implant post in the thinned and receded bone can result in a weakening or loosening of the restoration. The current invention remedies the need to drill out a large hole and further thin receding bone mass by a bone condensing and distension apparatus herein known as an implant distractor. Additionally, the current invention obviates the need for ridge augmentation procedures needed to increase bone mass prior to implant placement. In this invention, a smaller hole is drilled and a vertically sectioned, temporary implant distractor is installed. The implant distractor is split vertically into two or more sectors with cone shaped concave tapered depressions at the coronal and apical ends. A draw screw pulls a tapered cone nut upward into the bottom tapered hole and pulls a typical healing plug with a cone shaped convex lower element into the upper tapered hole or depression in the implant distractor. Over time, the vertical sections are forced apart to condense and distend the bone to form a wider, cosmetically desirable bone ridge with increased bone mass surrounding the final implant.
In this manner, the sectors of the implant distractor are spread out to a larger mean diameter to condense the surrounding cancellous bone and distend the alveolar and cortical bone to improve mass and appearance. The size of the initial hole is of lesser diameter than the final distended hole mean diameter. Some vertical cuts or gaps in the alveolar and cortical bone on the anterior labial or buccal side can aid in the repositioning of the alveolar anterior plate to improve appearance and bone mass.
A smaller diameter hole is initially needed to install the implant distractor. Periodic tightening of the draw screw (once every day or so) will force the bone outward. The implant distractor is removed after a suitable time. The final diameter of the hole will be large enough to accommodate a standard implant of commercial manufacture. The surrounding bone having been condensed and outwardly displaced will have the required mass and strength to support the most substantial implant post.
The implant distractor can be equipped with external vertical ribs, projections or grooves on the implant distractor sectors to lock the vertical sectors into the surrounding bone, preventing their rotational movement while the internal draw screw is tightened. Circumferential ribs, projections or grooves can be included to prevent vertical motion during tightening of the implant distractor screw. These ribs engage the inner surface of the bone with enough force to prevent shifting and rotating during the widening process but are backed away from, and no longer engage the bone, during the extraction of the implant distractor.
The implant distractor will have a mirror finish or a non-stick surface to prevent the ingrowth of tissue or bone during the distraction process to facilitate its easy removal after its work is done.
The implant distractor can be constructed in the overall shape of stepped truncated cones or of substantially oval cross sectional profile to better match with CAD/CAM (Computer Aided Design/Computer Aided Machining) manufactured implants. These implant are designed to meet special needs or to better match the emergence profile and root pattern of the original natural tooth.
REFERENCES:
patent: 4453539 (1984-06-01), Raftopoulos et al.
patent: 5931674 (1999-08-01), Hanosh et al.
patent: 5976142 (1999-11-01), Chin
patent: 5980522 (1999-11-01), Koros et al.
Bumgarner Melba
Schacht Ezra L.
Wilson John J.
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