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Marginal microleakage at the adhesive bonding interface submitted to storage in water, chemical aging or
Pedro Ivo da Graça Fagundes1, Ricardo Armini Caldas2, Rafael Leonardo Xediek Consani3
1Piracicaba Dental School, State University of Campinas, SP Brazil.
Purpose:
The aim of this in vitro study was to evaluate the marginal microleakage of the dentin/resin interface when subjected to water storage, chemical aging, or thermocycling in different adhesive luting treatments.
Materials And Methods:
Bovine teeth were used to prepare dentin blocks (5 × 4 × 1 mm) with one fully exposed dentin surface (n = 45). The blocks were randomly assigned to three luting protocols: 2BSE+DRC (two-bottle self-etch adhesive + dual-curing resin cement); SAP+PRC (self-adhesive primer + photo-activated dual resin cement); and SAP+SRC+O (self-adhesive primer + self-cured dual resin cement + Oxyguard II). Composite resin blocks of the same dimensions were luted onto the dentin blocks according to each protocol. Each treatment group (n = 15) was subdivided into three subgroups (n = 5) based on the aging challenge: storage in water for 7 days (control), aging in 10% sodium hypochlorite solution for 1 hour, or thermocycling for 5,000 cycles. Specimens were then individually immersed in a neutral methylene blue solution for 1 hour, rinsed with water, air-dried, and analyzed for marginal microleakage.
Results:
Data analyzed by ANOVA and Tukey's test (α = 0.05) showed that 2BSE+DRC exhibited the lowest microleakage after water storage for 7 days (100µm) and the highest after thermocycling (220µm), while sodium hypochlorite aging resulted in an intermediate value (190µm). SAP+PRC and SAP+SRC+O showed no statistically significant differences in microleakage when stored in water (170µm and 620µm, respectively) or after sodium hypochlorite aging (180µm and 610µm, respectively). SAP+SRC+O resulted in significantly greater microleakage in water storage (620µm) and sodium hypochlorite aging (610µm) compared to 2BSE+DRC (100µm and 190µm, respectively) and SAP+PRC (170µm and 180µm, respectively). Thermocycling produced significant differences among the three treatments (p less than 0.05), with SAP+SRC+O showing the highest microleakage (1,370µm), 2BSE+DRC the lowest (220µm), and SAP+PRC an intermediate value (810µm).
Conclusion:
Adhesive luting treatments exhibited different levels of marginal microleakage when subjected to water storage, chemical aging, or thermocycling. Thermocycling resulted in the highest marginal microleakage at the dentin/resin interface for all adhesive protocols tested.
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