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US 4,684,555 AGranted
Dental retention pins
OwnerStefan Neumeyerinventor
Life of this patent
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OwnerStefan Neumeyerinventor
Estimating the term…
A dental retention pin preferably made of metal is provided with a closed, cylindrical coating of bond assisting material, and an additional layer of a plastics filling material in order to obtain a physical-chemical or a purely chemical bond between the retention pin and the filling structure for obtaining a substantially increased retention power compared with known metal pins, which merely result in a mechanical or mechanical-physical joint to the filling structure. The retention force will be increased by shrinking the bond assisting layer or the outermost plastics layer onto said bond assisting layer around the pin so that the layer spans itself around the pin in a ring-like manner. Furthermore, examples for the structure of a retention pin are described, which improve the handling and insertion of such retention pins by the dentist considerably.
Dental retention pin comprising a first section to be inserted into the tooth substance and a second section extending into the filling structure and improving its retention to the tooth, wherein the retention pin is provided with a closed cylindrical or cup-shaped coating at least on said second section for increasing or alternatively improving the retention force, which coating includes at least one bond assisting layer, which undergoes a chemical or physical-chemical bond with the pin material and the material of the filling structure, is applied to the pin and is resistive to the wet conditions within the mouth.
A dental retention pin comprising a first section to be inserted into the tooth substance, a second section extending into the filling structure and improving the retention to the tooth, and a flange between the first and the second section for contacting the tooth substance, wherein the outer layer of the pin is provided as a screw head for receiving an insertion tool, the head of which tool or alternatively the shaft of the pin having a breaking point at which the tool head is separated from the shaft.
Dependencies are inferred from the claim text.