Medeiros Maria Isabel Dantas de, Carlo Hugo Lemes, Lacerda-Santos Rogério, Lima Bruno Alessandro Guedes de, Souza Frederico Barbosa de, Rodrigues Jonas Almeida, Carvalho Fabiola Galbiatti de
Universidade Federal da Paraíba, Universidade Federal da Paraíba, João Pessoa PB , Brazil, Universidade Federal da Paraíba - UFPB, Postgraduation Program on Dentistry, João Pessoa, PB, Brazil.
Universidade Federal de Campina Grande, Universidade Federal de Campina Grande, Department of Dentistry, Patos PB , Brazil, Universidade Federal de Campina Grande - UFCG, Department of Dentistry, Patos, PB, Brazil.
Braz Oral Res. 2016 May 31;30(1). doi: 10.1590/1807-3107BOR-2016.vol30.0075.
The layer formed by fluoride compounds on tooth surface is important to protect the underlying enamel from erosion. However, there is no investigation into the properties of protective layer formed by NaF and TiF4 varnishes on eroded enamel. This study aimed to evaluate the thickness, topography, nanohardness, and elastic modulus of the protective layer formed by NaF and TiF4 varnishes on enamel after erosion using nanoindentation and atomic force microscopy (AFM). Human enamel specimens were sorted into control, NaF, and TiF4 varnish groups (n = 10). The initial nanohardness and elastic modulus values were obtained and varnishes were applied to the enamel and submitted to erosive challenge (10 cycles: 5 s cola drink/5 s artificial saliva). Thereafter, nanohardness and elastic modulus were measured. Both topography and thickness were evaluated by AFM. The data were subjected to ANOVA, Tukey's test and Student's t test (α = 0.05). After erosion, TiF4 showed a thicker protective layer compared to the NaF group and nanohardness and elastic modulus values were significantly lower than those of the control group. It was not possible to measure nanohardness and elastic modulus in the NaF group due to the thin protective layer formed. AFM showed globular deposits, which completely covered the eroded surface in the TiF4 group. After erosive challenge, the protective layer formed by TiF4 varnish showed significant properties and it was thicker than the layer formed by NaF varnish.
牙齿表面由氟化物形成的层对于保护其下方的牙釉质免受侵蚀至关重要。然而，尚未对氟化钠（NaF）和四氟化钛（TiF4） varnishes在侵蚀后的牙釉质上形成的保护层的特性进行研究。本研究旨在使用纳米压痕和原子力显微镜（AFM）评估NaF和TiF4 varnishes在侵蚀后的牙釉质上形成的保护层的厚度、形貌、纳米硬度和弹性模量。将人类牙釉质标本分为对照组、NaF组和TiF4 varnish组（n = 10）。获得初始纳米硬度和弹性模量值，将varnishes应用于牙釉质并进行侵蚀挑战（10个循环：5秒可乐饮料/5秒人工唾液）。此后，测量纳米硬度和弹性模量。通过AFM评估形貌和厚度。数据进行方差分析、Tukey检验和学生t检验（α = 0.05）。侵蚀后，与NaF组相比，TiF4显示出更厚的保护层，纳米硬度和弹性模量值显著低于对照组。由于形成的保护层薄，无法在NaF组中测量纳米硬度和弹性模量。AFM显示球状沉积物，其完全覆盖了TiF4组中的侵蚀表面。在侵蚀挑战后，TiF4 varnish形成的保护层显示出显著特性，并且比NaF varnish形成的层更厚。
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