Effect of non ‐thermal atmospheric plasma on the dentin‐surface topography and composition and on the bond strength of a universal adhesive

This study investigated the effect of application of non‐thermal atmospheric plasma (NTAP) on the topography and composition of the dentin surface, as well as the microtensile bond strength (μTBS) of a universal adhesive to NTAP‐treated dentin. Exposed flat dentin surfaces from human third molars were either treated with NTAP for 10 and 30 s or untreated (control). The dentin‐surface topography and chemical composition were characterized by atomic force microscopy (n = 3) and Raman confocal spectroscopy (n = 5), respectively. The μTBS (n = 8) of Scotchbond Universal to dentin was determined after storage for 24 h and 1 yr, either by direct water exposure or under simulated pulpal pressure. In‐situ zymography was used to evaluate the influence of NTAP on the dentin‐enzymatic activity. Non‐thermal atmospheric plasma produced no remarkable topographical or chemical alterations at the dentin surface; only the amount of phosphate decreased following 10 s of treatment with NTAP. After 1 yr of direct water exposure, the μTBS of NTAP‐treated specimens did not differ statistically significantly from that of untreated controls, whereas simulated pulpal pressure‐aging resulted in a significantly higher μTBS for NTAP‐treated dentin. The dentin‐enzymatic activity appeared to be treatment‐dependent, but the untreated controls showed more intense fluorescence within the hybrid layer. Scotchbond Universal maintained its μTBS strength after 1 yr of direc...
Source: European Journal of Oral Sciences - Category: Dentistry Authors: Tags: Original Article Source Type: research