Rehardening and the protective effect of gamma-polyglutamic acid/nano-hydroxyapatite paste on surface-etched enamel

Nai Chia Teng, Aditi Pandey, Wei Hsin Hsu, Ching Shuan Huang, Wei Fang Lee, Tzu Hsin Lee, Thomas Chung Kuang Yang, Tzu Sen Yang, Jen Chang Yang

研究成果: 雜誌貢獻文章同行評審

摘要

Many revolutionary approaches are on the way pertaining to the high occurrence of tooth decay, which is an enduring challenge in the field of preventive dentistry. However, an ideal dental care material has yet to be fully developed. With this aim, this research reports a dramatic enhancement in the rehardening potential of surface-etched enamels through a plausible synergistic effect of the novel combination of γ-polyglutamic acid (γ-PGA) and nano-hydroxyapatite (nano-HAp) paste, within the limitations of the study. The percentage of recovery of the surface microhardness (SMHR%) and the surface parameters for 9 wt% γ-PGA/nano-HAp paste on acid-etched enamel were investigated with a Vickers microhardness tester and an atomic force microscope, respectively. This in vitro study demonstrates that γ-PGA/nano-HAp treatment could increase the SMHR% of etched enamel to 39.59 ± 6.69% in 30 min. To test the hypothesis of the rehardening mechanism and the preventive effect of the γ-PGA/nano-HAp paste, the surface parameters of mean peak spacing (Rsm) and mean arithmetic surface roughness (Ra) were both measured and compared to the specimens subjected to demineralization and/or remineralization. After the treatment of γ-PGA/nano-HAp on the etched surface, the reduction in Rsm from 999 ± 120 nm to 700 ± 80 nm suggests the possible mechanism of void-filling within a short treatment time of 10 min. Furthermore, ∆Ra-I, the roughness change due to etching before remineralization, was 23.15 ± 3.23 nm, while ∆Ra-II, the roughness change after remineralization, was 11.99 ± 3.90 nm. This statistically significant reduction in roughness change (p < 0.05) implies a protective effect against the demineralization process. The as-developed novel γ-PGA/nano-HAp paste possesses a high efficacy towards tooth microhardness rehardening, and a protective effect against acid etching.
原文英語
文章編號4268
期刊Polymers
13
發行號23
DOIs
出版狀態已發佈 - 12月 2021

ASJC Scopus subject areas

  • 化學 (全部)
  • 聚合物和塑料

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