[Investigation of utility and mechanics of use of hydroxyapatite for therapy of hypersensitive tooth root].
The efficiency of extremely small particles of hydroxylapatite on a therapy with hypersensitive tooth-necks was approved in a double-blind-study. 90% of the test persons stated an improvement of their complaints after 3-5 days, and 50% became complaintless within the time of study. The manner of working was proved with the help of x-ray inclination and by polarisation-optical studies.