Nanomechanical properties, SEM, and EDS microanalysis of dentin treated with 2.5% titanium tetrafluoride, before and after an erosive challenge

作者：Basting Roberta Tarkany^*; Leme Ariene Arcas; Bridi Enrico Coser; Botelho do Amaral Flavia Lucisano; Gomes Franca Fabiana Mantovani; Turssi Cecilia Pedroso; Bedran Russo Ana Karina

来源：Journal of Biomedical Materials Research Part B: Applied Biomaterials , 2015, 103(4): 783-789.

DOI：10.1002/jbm.b.33254

• dentin
• erosion
• nanohardness
• titanium tetrafluoride

The aim was to assess the nanohardness (H) and the reduced modulus of elasticity (E-r) of 2.5% titanium tetrafluoride (TiF4) modified dentin, before and after an erosive challenge with 0.3% citric acid (CA). Exposed dentin surfaces were divided into two groups (n=5): (1) Controlno dentin pretreatment with TiF4 prior to etching with CA, and (2) Experimentaldentin pretreatment with TiF4+CA. The H and the E-r of intertubular dentin were measured using a triboindenter at different time points: baseline for both groups, after using 2.5% TiF4 for the experimental group, and after using CA for both the experimental and the control groups. Scanning electron microscope and energy dispersive X-ray spectroscopy (EDS) analysis of the dentin surfaces were undertaken at the same time points for both groups. Two-way ANOVA for randomized block design was applied. There was significant interaction between the application of the TiF4 solution and different time points (p=0.001 for H and p<0.001 for E-r), identified by Tukey's test. Erosive challenge provided a significant decrease in H and E-r mean values. The TiF4 solution caused a significant increase in H and E-r values, but no significant differences were found between post-TiF4 and post-CA application. TiF4 application produced a precipitate surface layer on intertubular and intratubular dentin. EDS analysis indicated the presence of titanium. The H and E-r of the dentin surface were greatly increased after application of 2.5% TiF4. TiF4 may modify the micromorphology of the dentin surface and produces an erosive resistance surface.

• 出版日期2015-5