Dental prophylaxis angle and handpiece assembly

Abstract

A dental prophylaxis angle and handpiece assembly for cleaning and polishing teeth is provided. The dental prophylaxis angle is removably attached to the dental handpiece by an interlocking mechanism that includes extension locking tabs, a locking annular member, and an interlocking drive member in the handpiece. The prophy angle is securely snap-fitted onto the handpiece and locked in place so that it has minimal lateral movement. After the prophy angle has been used to treat a patient, it can be removed easily from the handpiece and disposed thereof.

Description

[0001]The present application is a continuation of US Design Patent Application Ser. No. 29 / 359,163 having a filing date of Apr. 7, 2010, now pending, which is a continuation of U.S. patent application Ser. No. 12 / 004,145 having a filing date of Dec. 20, 2007, now patented as U.S. Pat. No. 7,955,079.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to dental instruments used for cleaning and polishing teeth. More particularly, the invention relates to a dental prophylaxis angle and handpiece assembly. The dental prophylaxis angle is removably attached to the dental handpiece by a new interlocking mechanism.[0004]2. Brief Description of the Related Art[0005]Today, dental professionals use dental instruments commonly known as dental prophylaxis (prophy) angles for cleaning and polishing teeth. Referring to FIG. 1, traditional prophy angles (10) include a one-piece or multi-piece tubular housing (12) having sleeve (14), neck (16), a...

AI Technical Summary

Benefits of technology

[0017]The rear-facing end of the drive shaft has a piloting tip for guiding the prophy angle onto the dental handpiece. The drive shaft also includes protruding self-aligning tabs that define a recessed locking surface adapted for receiving an interlocking drive member located in the handpiece. The distal end of the prophy angle is open-ended so that it can be mounted onto the handpiece. The distal end includes a first locking extension with first locking tab and a second locking extension with second locking tab. The external surface of the prophy angle may include a handle area having a textured external surface for providing a better grip and feel.

Problems solved by technology

For example, after prolonged use and excessive vibrational motion, some drive shafts of some prophy angles can shear off in the handpiece.

The broken-off drive shaft can be difficult to remove from the handpiece and normally it must be returned to the factory for repair.

Another problem with some conventional prophy angle and handpiece systems is that the prophy angle shows poor stability when it is mounted on the handpiece.

Some prophy angles tend to wobble and rock.

This can cause significant problems when the prophy angle / handpiece assembly is being used during a cleaning procedure.

A dental professional may feel uncomfortable using such an unstable prophy angle / handpiece assembly, and it may cause added anxiety for the user and patient being treated.

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