Method of forming a uniform cosmetic or therapeutic coating on teeth
AssigneeColgate-Palmolive Company
InventorsRong Dong, Guofeng Xu, Shaotang Yuan, James Thomas, Kevern Fraser
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Abstract
Disclosed is a method of forming a uniform coating onto a tooth surface, which method includes: forming droplets by spraying an orally acceptable coating material through a spray nozzle, and depositing the droplets onto the tooth surface to thereby form a uniform coating. In the method, the droplets have a volume-averaged droplet size of about 1 μm to about 100 μm, a spray including the droplets travels from a tip of the spray nozzle towards the tooth surface at a spray rate of less than about 10 milliliters/minute, and the droplets include a film-forming polymer, a therapeutic agent and/or a cosmetic agent.
Claims12
A method of forming a uniform coating onto a tooth surface, which comprises:
- forming droplets by spraying an orally acceptable coating material through a spray nozzle;
- and
- depositing the droplets onto a tooth surface to form a uniform coating;
- wherein the droplets have a volume-averaged droplet size of less than 100 μm;
- wherein a spray comprising the droplets travels from a tip of the spray nozzle towards the tooth surface at a spray rate of about 9 milliliters/minute,
- wherein a spray distance is about 20 centimeters;
- wherein the atomization process comprises passing a stream of air through the spray nozzle;
- wherein the spray nozzle has a diameter of about 0.3 to about 0.5 millimeters;
- wherein a flow rate of the stream of air passing through the spray nozzle is from about 10 cubic feet per hour to about 12 cubic feet per hour;
- wherein the droplets comprise at least one substance selected from the group consisting of a film-forming polymer, a therapeutic agent and a cosmetic agent, and depositing the droplets onto the tooth surface to thereby form the uniform coating;
- and
- wherein the cosmetic agent is a whitening agent comprising whitening particles ranging in size from about 0.1 μm to about 10 μm, wherein the whitening particles have a refractive index greater than about 1.2.
A method of forming a uniform coating onto a tooth surface comprising:
- providing a spray nozzle fluidly coupled to a reservoir, the reservoir containing an orally acceptable coating material that is in liquid form and the spray nozzle having a diameter ranging from about 0.2 mm to about 0.5 mm;
- performing an atomization step by applying a stream of air through the spray nozzle to convert at least some of the orally acceptable coating material from liquid form into droplets that exit a tip of the spray nozzle toward the tooth surface at a rate of less than about 0.6 milliliters/minute;
- depositing the droplets onto the tooth surface to form a uniform coating;
- wherein the droplets have a volume-averaged droplet size of less than 100 μm;
- wherein a flow rate of the stream of air passing through the spray nozzle is from about 8 cubic feet per hour to about 12 cubic feet per hour;
- wherein a spray distance is about 5 centimeters;
- and
- wherein the orally acceptable coating material comprises a film-forming polymer and whitening particles, the whitening particles ranging in size from about 0.1 μm to about 10 μm and have a refractive index greater than about 1.2, and wherein the droplets have a volume-averaged droplet size of about 100 μm.
Dependencies are inferred from the claim text.