Oral lubricating and stain retarding compositions

Abstract

An oral lubricant having usefulness for alleviating the symptoms of dry mouth and preventing accumulation of dental stains based on a polyvinyl alcohol polymer containing composition in an orally acceptable carrier or vehicle. The invention relates generally to an oral composition having a function in lubricating the mouth and preventing the formation of stains on the surfaces of the teeth. The active ingredients of the composition are a polyvinyl alcohol, a metal chelating agent, lipophilic vitamin, surface active material and a phenolic anti microbial agent with anti-inflammatory properties.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates generally to an oral composition having a function in lubricating the mouth and preventing the formation of stains on the surfaces of the teeth. The active ingredients of the composition are a polyvinyl alcohol and a metal chelating agent. [0003] The invention also encompasses a method of treating xerostomia comprising of administering to an affected individual a lubricant composition containing an alcoholic polymer and a metal chelating agent in an orally acceptable vehicle. [0004] 2. The Prior Art [0005] Xerostomia commonly known as “dry mouth” is a condition in which the salivary glands do not produce sufficient quantities of saliva. This causes discomfort that can in some cases be quite severe. Without saliva, the mouth burns and the throat and tongue can undergo physiological changes. Teeth can also decay rapidly and the tongue can become smooth, cracked and vulnerable to infection. [0006]...

AI Technical Summary

Benefits of technology

[0017] Polyvinyl alcohols also referred to as polyhydroxy polymers are well known for their excellent adhesion to hydrophilic materials. Currently, as indicated above they are used for lubricating eyes. The use of polyvinyl alcohols for treating dry eyes has been detailed in U.S. Pat. No. 4,883,658, which teaches that polyvinyl alcohols interact with corneal surfaces and adsorbs fairly tenaciously so that it cannot be easily rinsed off from solid surfaces, related to the eyes. Further, U.S. Pat. No. 4,883,658 teaches that two types of polyvinyl alcohols are necessary to provide a stable lubricating film. Polyvinyl alcohol with high acetate content (but not more than 27%) is quite surface active and is capable of lowering the surface tension of water from 72 to 42 mN / m. On the other hand, polyvinyl alcohol that is fully hydrolyzed exhibits almost no surface activity at the water-air interface. In general, the lower the surface tension of a liquid, the more it will wet a given solid surface. It has now surprisingly been found that formulations containing a polyhydroxy polymer are effective in lubricating the mouth and have an added benefit of preventing the accumulation of stain on tooth surfaces.

[0019] Thus, the object of the present invention is to provide a composition and a method for lubricating the tissues of the mouth and at the same time preventing the accumulation of stain on tooth surfaces. The composition consists of formulating of a polyvinyl alcohol, metal chelating agents and a fat soluble vitamin. Surface active materials are also included aid in the solubilization of surface debrie and to further reduce the surface tension in order to assist in the formation of a lubricating and a protective film on the surfaces of the teeth and the mucosal surfaces.

[0020] Anti-inflammatory agents can also be added to the composition to provide relief from irritation arising from mouth dryness.

Problems solved by technology

This causes discomfort that can in some cases be quite severe.

Teeth can also decay rapidly and the tongue can become smooth, cracked and vulnerable to infection.

A patient suffering from xerostomia not only has decreased fluid in the mouth, but also an insufficient quantity of mucoproteins and mucopolysaccharides to hold fluid in contact with the cells and create a barrier to irritation and infection.

Until recently, the treatments for xerostomia have had significant drawbacks.

In addition, fluids or candy are typically not effective with more severe cases of xerostomia, nor do they provide long-lasting relief with mild cases.

These compositions have not found wide acceptance as many patients find, that such preparations are irritating or distasteful, and that their lubricating effect is of relatively short duration.

This lack of wide acceptance is believed due, at least in part to the fact that the artificial saliva preparations of the prior art do not fully possess the rheological characteristics of natural saliva which are responsible for natural saliva's lubricating effect.

For example materials such as Carbopol (carboxyvinyl polymers), are not water soluble thus leave a tacky, greasy residue in the oral cavity of the wearer, and can cause sustained oral irritation and some forms of adhesives remain in the oral cavity for only short periods of time, e.g. generally not more than about 10 or 20 minutes, and therefore cannot provide for delivery of a substance over an extended period of time.

Referring to U.S. Pat. No. 5,886,054, the disadvantage of combining polyvinyl alcohol with an electrolyte is that the cation may interact with the polymer and cause precipitation of polyvinyl alcohol.

Further, saliva is known to contain high concentrations of electrolytes, which may cause further precipitation of polyvinyl alcohol thus leaving a granular feeling in the mouth.

Further inclusion of salivary mucins have other disadvantages including; the mucins are biopolymers which are difficult to obtain in sufficient quantities and suitable purity, they are expensive and they may be obtained from animal salivary glands which may make the use of mucin unsuitable for some consumers and patients.