Comparative in vitro study of pulp capping materials.

OBJECTIVE

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.

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.

CONCLUSIONS

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.