[Investigation of chemical reaction and isolation of calcium hydroxide and Zn-phosphate cement in vitro conditions].
An important question in conservative dentistry is whether in direct contact of calcium hydroxide paste and phosphate cement the neutralization of pH calcium hydroxide occurs and how it can be prevented. Chemical investigations performed in vitro conditions (in the test tube) concerned 3 groups, each of which had 12 samples. In the A group (control group) calcium hydroxide paste was put at the bottom of the test tube and ZOOK paste and phosphate cement layer were put over it; in the B group, Tubulitec base in 2 layers was applied over calcium hydroxide cement and then the phosphate cement; and in the C group, the calcium hydroxide paste and phosphate cement were put in the test tube in direct contact. Within 12 weeks, after 7 days, the 3 samples were investigated (1 in each group). Contrary to expectations the results showed that in direct contact of calcium hydroxide paste and phosphate cement no change occurred in pH calcium hydroxide, and that its average value was 12.70. Further were there was no statistically significant difference in values of pH calcium hydroxide paste among the A, B and C groups. On the basis of these studies and in the opinion of other authors, it may be concluded that, although there was no decrease in pH calcium hydroxide in direct contact of calcium hydroxide paste and phosphate cement, it should be necessary to make the mutual isolation of these materials; in practice this is most efficiently done on two-layer Tubulitec base.
Stevanović
R
R
D002126:Calcium Hydroxide; D002130:Calcium Phosphates; D003736:Dental Cavity Lining; D004338:Drug Combinations; D006863:Hydrogen-Ion Concentration; D011137:Polystyrenes; D013943:Thymol / Q000031:analogs & derivatives; D015036:Zinc Phosphate Cement
D002130:Calcium Phosphates; D004338:Drug Combinations; D011137:Polystyrenes; C018685:Tubulitec; D013943:Thymol; D015036:Zinc Phosphate Cement; D002126:Calcium Hydroxide
Ispitivanje medusobne hemijske reakcije i mogućnosti izolacije kalcijum hidroksid paste i fosfatnog cementa u in vitro uslovima.