Drug – bio-affecting and body treating compositions – Dentifrices
Reexamination Certificate
2000-02-29
2002-08-27
Hartley, Michael G. (Department: 1617)
Drug, bio-affecting and body treating compositions
Dentifrices
C424S053000, C424S054000
Reexamination Certificate
active
06440396
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of dentistry, and specifically to the whitening of the teeth.
BACKGROUND OF THE INVENTION
Teeth generally become more darkly pigmented with age and exposure to such materials as tea and coffee, and it has long been a goal of dentistry to provide a means to safely and effectively reverse this darkening process. Historically there are two approaches to the problem. The first involves removing pigmentation that has adhered onto the surface of the teeth. This is commonly achieved through the use of abrasives, sometimes augmented with solvents. While rapidly effective, these techniques have the disadvantage of only being able to remove extrinsic stains, leaving all internal pigmentation unchanged. Thus the whitening effect is extremely limited.
A more recent innovation involves a method of using oxidizing agents to penetrate into the tooth structure and bleach out the undesired pigmentation. The active agents are usually either weak solutions of hydrogen peroxide or carbamide peroxide, which is more stable than hydrogen peroxide.
While effective on both extrinsic and intrinsic discolorations, one major problem encountered with this second approach is the enormous amount of treatment time needed to gain adequate penetration of the tooth structure by the whitening agent. At present, the method of application of the whitening agent utilizes either custom or stock trays that are shaped to hold the bleaching agent against the teeth to be whitened. These trays are then filled with the peroxide, and worn for long periods of time, sometimes even overnight. After a series of lengthy treatments, the teeth will usually begin to show the desired whitening effect. The length of these treatments can be discouraging and increases the cost. It is therefore desirable to find a method to more rapidly whiten the teeth.
SUMMARY OF THE INVENTION
In one embodiment, the invention provides a composition whitening teeth, using an effective amount of a bleaching compound and a catalytic activator, where the catalytic activator catalyzes the reaction of a significant portion of the bleaching compound within ten minutes.
In a second embodiment, the invention provides a method for whitening teeth consisting of providing a bleaching compound, providing a catalytic agent, and combining the bleaching agent with the catalytic agent so that a reaction of a significant portion of the bleaching agent occurs within ten minutes.
In another embodiment, the invention provides a device for whitening teeth, consisting of a toothbrush with a head and a handle, where the head has a plurality of bristles, and at least one of the bristles contains a catalytic activator. The handle of this device has a reservoir for a bleaching compound and a means for dispensing the bleaching compound.
In a further embodiment, the invention provides a device for whitening teeth, consisting of a toothbrush with a head and a handle, where the head has an applicator and a catalytic activator capable of catalyzing the reaction of a bleaching compound applied to the head.
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Hartley Michael G.
Klarquist & Sparkman, LLP
Willis Michael A.
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