Screw for securing a dental prosthesis
AssigneesTobon Enterprises Corp, Uniqa Dental LTD
InventorsJeffry Tobon, Samyon Kupchan, Daniel Goberman
Life of this patent
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Abstract
A screw (10) for securing a dental prosthesis directly to a dental abutment includes a threaded portion (12) lying within a virtual cylinder (14) of a first diameter D1, and a head portion (16) having a shaped recess (18) for receiving a driver. The head portion (16) has a second diameter D2 greater than first diameter D1. A conical clamping surface (20) lies between threaded portion (12) and head portion (16) and forms a conical angle α to a central axis (22) of the virtual cylinder, where α is between 25 and 35 degrees, and preferably around 30 degrees. The conical clamping surface may be provided with a number of anti-rotation grooves (26).
Claims7
A screw for securing a dental prosthesis directly to a dental abutment, the screw comprising:
- (a) a threaded portion for engaging a female thread of an abutment, said threaded portion lying within a virtual cylinder of a first diameter;
- (b) a head portion having a shaped recess for receiving a driver, said head portion having a second diameter greater than said first diameter;
- (c) a conical clamping surface between said threaded portion and said head portion, said conical clamping surface forming a conical angle α to a central axis of said virtual cylinder, where a is between 25 and 35 degrees, said conical clamping surface including a plurality of anti-rotation grooves, each of said anti-rotation grooves defining a step oriented to oppose a loosening rotation of said threaded portion;
- and
- (d) an un-threaded cylindrical portion having said first diameter interposed between said threaded portion and said conical clamping surface.
Dependencies are inferred from the claim text.