4.7 Article

Remineralization of Demineralized Enamel via Calcium Phosphate Nanocomposite

期刊

JOURNAL OF DENTAL RESEARCH
卷 91, 期 10, 页码 979-984

出版社

SAGE PUBLICATIONS INC
DOI: 10.1177/0022034512458288

关键词

dental nanocomposite; calcium phosphate nanoparticles; human enamel; lesion remineralization; contact microradiography; caries inhibition

资金

  1. NIH [R01DE17974]
  2. University of Maryland School of Dentistry

向作者/读者索取更多资源

Secondary caries remains the main problem limiting the longevity of composite restorations. The objective of this study was to investigate the remineralization of demineralized human enamel in vitro via a nanocomposite containing nanoparticles of amorphous calcium phosphate (NACP). NACP were synthesized by a spray-drying technique and incorporated into a dental resin. First, caries-like subsurface enamel lesions were created via an acidic solution. Then, NACP nanocomposite or a commercial fluoride-releasing control composite was placed on the demineralized enamel, along with control enamel without a composite. These specimens were then treated with a cyclic demineralization/remineralization regimen for 30 days. Quantitative microradiography showed typical enamel subsurface demineralization before cyclic demineralization/remineralization treatment, and significant remineralization in enamel under the NACP nanocomposite after the demineralization/remineralization treatment. The NACP nanocomposite had the highest enamel remineralization (mean +/- SD; n = 6) of 21.8 +/- 3.7%, significantly higher than the 5.7 +/- 6.9% for fluoride-releasing composite (p < 0.05). The enamel group without composite had further demineralization of -26.1 +/- 16.2%. In conclusion, a novel NACP nanocomposite was effective in remineralizing enamel lesions in vitro. Its enamel remineralization was 4-fold that of a fluoride-releasing composite control. Combined with the good mechanical and acid-neutralization properties reported earlier, the new NACP nanocomposite is promising for remineralization of demineralized tooth structures.

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