Comparative study of microleakage in primary molars restored with filling and stainless-steel pediatric crowns after pulpotomy simulation in vitro

Aim. It was to assess microleakage in primary molars restored with fillings and stainless steel preformed pediatric crowns (SSCs) after simulating pulpotomy in vitro. Materials and methods. The study comprised 6! extracted in 5-10 years old children primary molars which were randomly divided into four groups: after pulpotomy simulation the teeth were restored with compomer fillings (n = 16), composite resins (n = 12) or SSCs with cavities filled by GIC (n = 17) or compomer (n = 14). Two teeth with sound enamel were used as controls. After thermocycling, the specimens were placed in 0.5% fuchsin and sectioned, the proportions of microleakage were evaluated with a digital microscope for microleakages. Results. The rate and degree of microleakages was significantly higher in fillings than in SSCs (p< 0.0001). Perfect marginal seal demonstrated 50% of SSCs and only 21.2% of fillings, while the rate of extensive leakage was 5 times higher in fillings (54.6% vs 11.5% in SSCs). Composite resin showed the highest rate of microleakage (75% of fillings had more than 50% staining of contact with dental hard tissues). ANOVA revealed as leading factors for microleakages restoration with fillings (p = 0.00008), cavity extension and technical pitfalls (p = 0.03). Conclusion. Composite resins demonstrated very high rate of microleakages and SSCs should be a material of choice for restoration of primary teeth after pulpotomy.

временные зубы, композит, компомер, коронки, микроподтекания, primary molars, compomers, composite resins, stainless steel crowns, microleakage