RADIOACTIVE LABELING IN THE STUDY OF ABRASION OF HARD TOOTH TISSUE

Labeling the surface of hard tooth tissue samples by the nuclear recoi l effect in radioactive decay was applied to study abrasion caused by abrasive components of tooth-pastes. Rn-222 and its short-lived decay products were implanted into the surface in vacuum. For this purpose i rradiation was applied to sample placed very close to thin Ra-226 sour ce. Measuring the activity before and after abrasion was used to evalu ate abrasion in the system toothbrush - various suspensions of the too th-pastes - hard tooth tissue (enamel or dentine) in a specially desig ned device, dentoabrasionmeter VUS 2.