| Background. Contamination of dentin surface is one of the common problems in restorative
dentistry. The aim was to investigate the effects of different surface contaminators on the dentin
shear bond strength (SBS) of universal adhesive system (UAS) applied in etch-and-rinse (ER) and
self-etch (SE) strategies.
Methods. One hundred forty-four maxillary anterior sound human teeth were divided into six
groups based on the types of surface contaminators: no surface contaminator (control) and
experimental groups contaminated with blood, saliva, aluminium chloride (ALC), ferric sulphate
(FS), and caries disclosing agent (CDA). Then, each group was further subdivided into two, based
on the application strategy of UAS (ER and SE). After applying the adhesive according to the
manufacturer’s instructions, and bonding cylindrical composite samples, the SBS was measured.
The data were analysed using two-way ANOVA, Tukey’s HSD test and t test (P < 0.05).
Results. The SBS in all contaminated groups, except for CDA, was significantly lower in both ER
and SE strategies compared to control group (P < 0.05). A comparison between the application
strategies revealed that ER and SE were only significantly different in the FS contaminated group
(P < 0.05).
Conclusion. All tested contaminators, except CDA, significantly decreased SBS of UAS in both
ER and SE strategies. |