[Clinical results of potassium nitrate use in polycarboxylate cement for biological treatment of reversible pulpitis].

To determine effectiveness of indirect pulp capping with 5% potassium nitrate in polycarboxylate cement for biological treatment of reversible pulpitis, a clinical study of 232 teeth with active caries lesions from 205 healthy patients aged from 16 to 40 years was performed. They were divided into 2 groups: the study group--140 teeth of 127 persons with 5% potassium nitrate in polycarboxylate cement (Carboxy Adhesor); control group--92 teeth of 78 persons with calcium-hydroxide cement (Dycal). Short-term clinical results showed better desensitizing effect and faster recovery to normal values of electric vitality in teeth treated by potassium nitrate in comparison with Dycal lining (p<0.001). Long-term follow-up (up to 2 years) showed good functional conditions, preserved vitality and x-ray status of the treated teeth.

Comparative in vitro study of pulp capping materials.

AIM: In a comparative in vitro study we examined the bactericidal effect, adhesion and shrinkage of 5% potassium nitrate in Carboxy-Adhaesor, 5% potassium chloride in Carboxy-Adhaesor, Carboxy-Adhaesor, Adhaesor and Dycal. MATERIAL AND METHODS: The bactericidal effect of the investigated pulp capping materials on the isolated microorganisms Staphylococcus aureus, Staph. epidermidis, Streptococcus viridans alpha-haemolyticus, Streptococcus pneumoniae and Streptococcus beta-haemolyticus was assessed by the diffusion method around each disk in mm. The adhesion and shrinkage were assessed after hardening of the material. RESULTS: The results obtained showed higher bactericidal activity of polycarboxylate cements in comparison to Adhaesor and Dycal. The largest zone of inhibition was found around the disks with polyacrilic acid, followed by 5% KNO3 in polyacrilic acid, 5% KCl in polyacrilic acid; significantly smaller is the zone around Dycal. The difference was statistically significant (p<0.01). The adhesion and shrinkage of polycarboxylate cements were estimated as very good, better than those of Adhaesor and Dycal. CONCLUSION: The bactericidal effect of 5% KNO3 in polycarboxylate cement is very good for the microorganisms isolated from deep caries. The adhesion to hard tissues is very good, which suggests good marginal adaptation to the cavity.

Dynamics of potassium and nitrate ions release from polycarboxylate cement with 5% KNO3.

Release of potassium and nitrate ions from polycarboxylate-cement blocks containing 5% KNO3, with different exposure in extragent aqua redestillata was studied. Using flame photometry we found increased concentration of eliminated potassium ions into the extragent after the 24th hour (0.90 +/- 0.03 mg/cm3) while the maximum quantity of released potassium ions was measured after the 14th day (336 h)--1.50 +/- 0.02 mg/cm3 (t = 60, P < 0.001). The concentration of the released nitrate ions was determined by spectrophotometry at l = 410 nm. The degree of extraction of nitrate ions from the model cement blocks progressively increased with time, but their concentration in the cement decreased after the 14th day too, demonstrating a statistically significant difference: from 4.50 mg on the 20th minute to 2.60 mg on the 14th day (t = 115, P < 0.001).