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Spectroscopic discrimination of green tea’s impact on teeth at different temperatures
Author(s): Sinai H. C. Manno; Francis A. M. Manno; Irfan Ahmed; Vincent Wai Li; Li Tian; Tak Fu Hung; Shuk Han Cheng; Condon Lau
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Paper Abstract

Background: The effect of tea on teeth under temperature conditions has not been studied previously. Model: The present study used an in vitro one-week immersed tooth model with different tea temperatures, hot and cold. An in vivo tea administration model, allowing rats to drink tea over the course of a week, was also performed. Methods: Elemental content of tea leaves was identified by ICP-MS, Laser-Induced Breakdown Spectroscopy (LIBS) for elemental spectrum analysis, Atomic Force Microscopy (AFM) for roughness analysis, scanning electron microscopy for ultrastructural assessment and histology used for structural assessments. Results: The LIBS analysis demonstrated a significant increase in the mineral elements (Zn, Mg, Ca, Sr and Fe) from tea in vivo. For in vitro, increases of Fe and K were significantly higher in the hot-tea group than in the cold-tea group, with a decrease of the elements in hydroxyapatite forming teeth, albeit not statistically significance, though. The LIBS showed that in vitro cold-tea group drastically increased Zn, C, Ca, Mn, Mg, P, Sr, Fe and K compared with cold-water. While in vitro hot-tea group was significantly increased in Mg, Ca, Sr, Fe and K compared with hot-water. The AFM did not show a significance difference among groups in vivo or in vitro, but in vivo tea presented a higher roughness compared with cold-tea, hot-tea and hot-water, indicating a polishing effect due to temperature and tea. Using scanning electron microscopy, hot-water induced cracks more than 1μm while cold-tea and hot-tea revealed extrinsic matter adhered to teeth. Histological analysis showed considerable increase in the percentage of mineralization from cold tea on the enamel surface. Conclusion: Under cold conditions, tea prompted an interaction of the inorganic components in teeth: Ca, Mg, P, Fe and K. An accumulation in the organic matrix was promoted by tea. However, high temperature facilitated deposition of metals associated with teeth staining. Moreover, under hot temperature teeth lost the mineral phase leading to demineralization. Even though green tea protects enamel, its potential is susceptible to prompting demineralization over dental structures under high temperatures.

Paper Details

Date Published: 22 July 2019
PDF: 5 pages
Proc. SPIE 11079, Medical Laser Applications and Laser-Tissue Interactions IX, 110791A (22 July 2019); doi: 10.1117/12.2526682
Show Author Affiliations
Sinai H. C. Manno, City Univ. of Hong Kong (Hong Kong, China)
Francis A. M. Manno, City Univ. of Hong Kong (Hong Kong, China)
Irfan Ahmed, City Univ. of Hong Kong (Hong Kong, China)
Vincent Wai Li, City Univ. of Hong Kong (Hong Kong, China)
Li Tian, City Univ. of Hong Kong (Hong Kong, China)
Tak Fu Hung, City Univ. of Hong Kong (Hong Kong, China)
Shuk Han Cheng, City Univ. of Hong Kong (Hong Kong, China)
Condon Lau, City Univ. of Hong Kong (Hong Kong, China)


Published in SPIE Proceedings Vol. 11079:
Medical Laser Applications and Laser-Tissue Interactions IX
Lothar D. Lilge; Carsten M. Philipp, Editor(s)

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