Zinc and silica are active components to efficiently treat in vitro simulated eroded dentin.
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AuthorOsorio, Raquel; Toledano-Osorio, Manuel; Osorio, Estrella; Aguilera, Fátima S.; Padilla-Mondéjar, Sussette; Toledano, Manuel
Osorio R, Toledano-Osorio M, Osorio E, Aguilera FS, Padilla-Mondéjar S, Toledano M. Zinc and silica are active components to efficiently treat in vitro simulated eroded dentin. Clin Oral Investig. 2018 Feb 5. [http://hdl.handle.net/10481/53242]
SponsorshipProjects RTC-2014-1731-1 and MAT2014-52036-P supported by the Ministry of Economy and Competitiveness and European Regional Development Fund.
Objectives: Biomaterials for treating dentin hypersensitivity and dentin wear were evaluated, to efficiently occlude the dentinal tubules and to increase dentin resistance to abrasion. Materials and Methods: 24 dentin surfaces were treated with EDTA to expose dentinal tubules, and were: 1) non-brushed, 2) brushed with distilled water, or with pastes containing 3) Monetite, 4) Brushite, 5) Zn-Monetite, 6) Zn-Brushite, 7) Silica-Brushite and 8) NovaMin®. Topography, nanomechanical and chemical analysis were assessed on dentin surfaces (n=3) after artificial saliva immersion for 24 h, and after citric acid challenge. 21 further dentin specimens were created to evaluate dentin permeability after brushing, saliva storage and acid application (n=3). ANOVA, Student-Newman-Keuls (p<0.05) and Student t-test (p<0.001) were used. Results: Particles containing major proportion of silica attained intratubular occlusion by carbonate crystals (Raman carbonate peak heights: 15.17 and 19.24 au; complex modulus: 110 and 140 GPa, at intratubular dentin). When brushing with pastes containing higher proportion of silica or zinc, phosphate calcium compounds were encountered into tubules and over dentin surfaces (Raman intratubular phosphate peak heights: 49 to 70 au, and at the intertubular dentin: 78 to 92). The formed carbonated apatite and calcium phosphate layer were resistant to citric acid application. Zinc compounds drastically increased tubule occlusion, decreased dentin permeability (up to 30%) and augmented mechanical properties at the intertubular dentin (90-130 GPa), it was maintained after acid challenging. Conclusions: Zinc-containing pastes occluded dentinal tubules and improved dentin mechanical properties. Clinical Relevance: Using zinc as an active component to treat eroded dentin is encouraged.