Dowel post for dental and medical prosthetic devices
First Claim
1. A dowel post for anchoring a dental or medical prosthetic device comprising a head on which said device may be formed or mounted and a shaft extending therefrom for insertion into a previously prepared parallel-sided blind hole, and secured therein by a cement, wherein said shaft is of substantially constant diameter along its length and is provided with a plurality of concave flutes helically intertwined about the axis of said shaft and co-extending substantially along the length thereof at a pitch angle of 70°
- or less to the axis of the shaft, said concave flutes being contiguous around the circumference of the shaft, and providing said shaft with a substantially uniform polygonal section along its length.
1 Assignment
0 Petitions
Accused Products
Abstract
A dowel post for securing dental and medical prostheses is provided having improved retention when cemented in a parallel-sided blind hole, and which reduces build-up of hydrostatic pressure ahead of the post as it is inserted. The dowel post comprises a head on which said prosthesis is formed or mounted and a shaft extending downwardly therefrom having a channel formed therealong providing a flow path for the cement. The channel is formed by one or more and preferably four or five helical concave flutes wound about the axis of the post at a pitch angle to the axis of 70° or less and preferably at about 45°.
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Citations
6 Claims
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1. A dowel post for anchoring a dental or medical prosthetic device comprising a head on which said device may be formed or mounted and a shaft extending therefrom for insertion into a previously prepared parallel-sided blind hole, and secured therein by a cement, wherein said shaft is of substantially constant diameter along its length and is provided with a plurality of concave flutes helically intertwined about the axis of said shaft and co-extending substantially along the length thereof at a pitch angle of 70°
- or less to the axis of the shaft, said concave flutes being contiguous around the circumference of the shaft, and providing said shaft with a substantially uniform polygonal section along its length.
- View Dependent Claims (2, 3, 4, 5)
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6. In a method of crowning a tooth root which comprises inserting a dowel post into a previously prepared, parallel-sided blind hole in the tooth root and securing the dowel post therein by means of a cement, the exposed end of the dowel post providing a point of attachment for the tooth crown, the improvement which comprises inserting into a cement-lined blind hole a dowel post having a shaft of substantially constant diameter along its length and provided on its surface with a plurality of concave flutes helically intertwined about the axis of said shaft and co-extending substantially along the length thereof at a pitch angle of 70°
- or less to the axis of the shaft, said concave flutes being contiguous around the circumference of the shaft, and providing said shaft with a substantially uniform polygonal section along its length.
Specification