EFFECT OF CALCIUM HYDROXIDE AND FLUORIDES ON HUMAN DENTIN

With the aid of scanning EM and microradiography, 45 teeth including 20 contralateral tooth pairs were studied to assess the effect on human dentine of a 1 min treatment with 3% NaF, a dressing of Ca(OH)2 and a dressing of Ca(OH)2 and CaPO3F after follow-up periods of 2-8 wk. After NaF treatment the SEM [SE of the mean] revealed no sign of obliteration of the dentinal tubules, and on microradiograms no indication of increased density could be registered compared to an untreated control area. Under the Ca dressing the SEM revealed in 13 cases out of 20 (5 cases of 11 intrapair comparisons) a varying degree of constriction of the dentinal tubules. Constrictions varied from 1 tubule to another and ceased approximately 0.1 mm in the dentine. On the microradiograms no significant difference could be recorded between untreated dentine and dentine treated with the Ca dressings. Dressings of Ca(OH)2, a combination of Ca(OH)2 and CaPO3F for 2 mo., or a 1 min treatment with a cavity cleaner containing 3% NaF did not result in a reliable obliteration of the dentinal tubules.