Influence of two carbodiimides on the bond strength of universal adhesives to dentin

AbstractThe pretreatment of dentin with cross-linking agents during bonding procedures has been proposed to improve the mechanical properties of the collagen in the hybrid layer and reduce the biodegradation of the adhesive interface. The aim of this study was to evaluate the influence of pretreatment with two carbodiimides on the dentin bond strength of universal adhesives, after thermocycling. Three universal adhesives in the self-etching mode were used (Single Bond Universal —SBU, Clearfil Universal—CLU and Ambar Universal—ABU). A self-etching adhesive system (Clearfil SE Bond—CSB) was used as control. Two carbodiimides, 1-ethyl-3-(3′-dimethylaminopropyl)-carbodiimide (EDC) and N,N′-dicyclohexylcarbodiimide (DCC), were applied for 1 min. The excess solution was removed with absorbent paper and the universal adhesives were applied. The specimens were stored for 24 h in distilled water at 37 °C or 10,000 thermal cycles (5–55 °C, 30 s) and then were prepared for microtensile bond strength test (n =  4 teeth, average of 21 sticks per group). Data were analyzed using three-way ANOVA and Tukey’s (α =  5%). After 24 h, SBU and CSB had statistically similar bond strength values for the control groups (22.07  ±  9.03 and 19.82  ±  7.28 MPa), with EDC (30.21  ±  11.30 and 19.67  ±  5.36 MPa) and DCC (30.12  ±  13.43 and 19.82  ±  7.28 MPa) pretreatments (p >   0.05). The use of EDC (32.57  ±  9.60 MPa) an...

Source: Odontology - July 19, 2021 Category: Dentistry Source Type: research