Ultramulsion containing interdental delivery devices

An interdental delivery device coating containing a high shear ULTRAMULSION dispersion comprising a nonionic poloxamer surfactant and polydimethylsiloxane insoluble in said surfactant wherein:

• a. said polydimethylsiloxane is oriented has the chemical composition (CH.sub.3).sub.3 SiO[SiO(CH.sub.3).sub.2 ].sub.n Si(CH.sub.3).sub.3, wherein n is a whole number;
• b. said surfactant has the chemical composition ##STR6## wherein x, y, and x' are whole numbers;
• c. the viscosity of the polydimethylsiloxane ranges from between about 100,000 and about 4 million cs;
• d. the particle size of most of the polydimethylsiloxane in the ULTRAMULSION dispersion is from between about 0.1 and about 10 microns;
• e. from between about 80% and 95% of said polydimethylsiloxane particles in the ULTRAMULSION dispersion are from between about 1 and about 10 microns;
• f. the nonionic surfactant at is a polyoxyethylene-polyoxypropylene block copolymer having a molecular weight from between about 1,100 and about 150,000;
• g. the ratio of surfactant to polydimethylsiloxane is from between about 400:1 and about 1:2;
• and
• h. the polydimethylsiloxane contains one or more lipid suitable active ingredients.

A method of manufacturing interdental delivery devices treated with an ULTRAMULSION dispersion said method comprising, heating a surfactant and a silicone mixture in a heated, stirred vessel substantially free from water, followed by subjecting said mixture to high shear dispersion and introducing said dispersion into said interdental delivery device by means of a vacuum loading;

• wherein:
• a. the silicone is insoluble in said surfactant, has a viscosity greater than about 100,000 cs and up to about 50 million cs, and a particle size up to about 10 microns,
• b. the surfactant to silicone ratio in the high shear dispersion is from between about 400:1 and about 1:1;
• and the surfactant has an orienting effect on the silicone,
• c. the silicone is oriented, exhibits enhanced substantivity to surfaces in the oral cavity and functions as a reservoir for one or more lipid soluble and lipid dispersible oral care active ingredients.