COATING COMPOSITIONS HAVING HYDROPHILIC AND HYDROPHOBIC PARTICLES FOR USE IN INTRAORAL SCANNING METHODS

1 . An aqueous dental coating composition comprising:

an aqueous solvent system;

a water soluble polymer present at no greater than 5 wt. %, based on the total weight of the aqueous dental coating composition;

hydrophilic particles; and

hydrophobic particles,

wherein the aqueous dental coating composition is a dispersion or a dispersion of the hydrophilic particles and hydrophobic particles in the aqueous solvent system can be formed by shaking the composition for 30 seconds.

2 . The aqueous dental coating composition of claim 1 , wherein the hydrophilic particles and the hydrophobic particles are substantially non-absorptive in the visible range.

3 . The aqueous dental coating composition of claim 1 , wherein the hydrophilic particles and the hydrophobic particles are tooth-colored.

4 . The aqueous dental coating composition of claim 1 , wherein the aqueous solvent system comprises water, or water and ethanol.

5 . The aqueous dental coating composition of claim 4 , wherein the aqueous solvent system comprises 0 to 35 wt. % ethanol, based on the total weight of water and ethanol.

6 . The aqueous dental coating composition of claim 1 , wherein the aqueous dental coating composition comprises 0.1 to 5 wt. % of the water soluble polymer, based on the total weight of the aqueous dental coating composition.

7 . The aqueous dental coating composition of claim 1 , wherein the water soluble polymer is selected from the group consisting of modified cellulose, polyethylene glycol (PEG), polyacrylic acid, polyvinyl alcohol (PVA), polyethylene oxide-polypropylene oxide copolymers (PEO-PPO), polyethylene oxide-vinyl acetate copolymers (PEO-PVAc), polyvinyl pyrrolidinone (PVP), and combinations thereof.

8 . The aqueous dental coating composition of claim 1 , wherein the hydrophilic particles have an average size of 0.01 to 10 microns.

9 . The aqueous dental coating composition of claim 1 , wherein the hydrophilic particles comprise inorganic particles.

10 . The aqueous dental coating composition of claim 1 , wherein the hydrophilic particles comprise TiO 2 particles.

11 . The aqueous dental coating composition of claim 1 , wherein the aqueous dental coating composition comprises 5 to 25 wt. % of the hydrophilic particles, based on the total weight of the aqueous dental coating composition.

12 . The aqueous dental coating composition of claim 1 , wherein the hydrophobic particles have an average size of 0.01 to 10 microns.

13 . The aqueous dental coating composition of claim 1 , wherein the hydrophobic particles comprise inorganic particles.

14 . The aqueous dental coating composition of claim 1 , wherein the hydrophobic particles comprise surface treated inorganic particles.

15 . The aqueous dental coating composition of claim 1 , wherein the hydrophobic particles comprise tricalcium phosphate particles surface treated with sodium lauryl sulfate.

16 . The aqueous dental coating composition of claim 1 , wherein the aqueous dental coating composition comprises 1 to 15 wt. % of the hydrophobic particles, based on the total weight of the aqueous dental coating composition.

17 . A method of intraoral scanning comprising:

applying an aqueous dental coating composition of claim 1 , to an intraoral surface or model thereof to form a coating on the surface; and

scanning the coated surface to form a three dimensional representation of the intraoral surface.

18 . The method of claim 17 further comprising drying the applied aqueous dental coating composition to form the coating.

19 . The method of claim 18 , wherein the dried coating has an average thickness of at most 10 microns.

20 . The method of claim 17 , wherein applying comprises brushing, rinsing, sponging, spraying, or a combination thereof.