Effectiveness of poly-γ-glutamic acid in maintaining enamel integrity

Qamar, Zeeshan and Rahim, Zubaidah Haji Abdul and Gan, Seng Neon and Chew, Hooi Pin and Zeeshan, Tayyaba (2019) Effectiveness of poly-γ-glutamic acid in maintaining enamel integrity. Archives of Oral Biology, 106. p. 104482. ISSN 0003-9969, DOI https://doi.org/10.1016/j.archoralbio.2019.104482.

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Official URL: https://doi.org/10.1016/j.archoralbio.2019.104482


Objective: The aim of the study was to determine demineralisation inhibition and remineralisation potential of poly-γ-glutamic acid with its possible mechanism of action on human dental enamel. Methodology: Three sodium-fluoride(NaF) concentration(0.01%w/v,0.1%w/v and 0.5%w/v respectively)and two poly-γ-glutamic acid(PGGA)concentration(1%w/v and 2%w/v respectively)were prepared in 0.1 M acetic acid(pH4.0)and deionized distilled water.For de/re-mineralisation study, tooth samples (18 teeth varnished, leaving a 2 mm2 window on the mid-buccal surfaces) were immersed in respective acidified NaF and PGGA solutions. The Ca2+ release/uptake was monitored with ISE over 72-hr with increasing pH every 24-h from 4.0 to 6.0.These teeth were later subjected to cross-sectional microhardness to determine integrated mineral recovery of enamel on increasing pH of respective acidified solution.In order to determine mechanism of PGGA,two concentrations of PGGA in deionized-water-solutions were used for tooth samples immersion followed by overnight drying then later subjected to Fourier Transform Infra-Red(FT-IR) analysis.The FT-IR analysis was also carried out on PGGA powder.For control,the experiment was repeated using hydroxyapatite(HAp)pellets.The density of PGGA solutions(1%and2%)was also measured to determine their dynamic viscosities. Results: The ISE and microhardness testing revealed statistically significant (ρ ≤ 0.05) dissolution inhibition and remineralisation potential for tooth sample treated with acidified 2%PGGA. From the FT-IR spectra, it was observed that the profiles of the enamel and HAp surfaces treated with 1%-and 2%-PGGA solutions were similar to those of PGGA powder.It was found that the viscosity of PGGA increases with increasing concentration. Conclusion: The study implies that 2% PGGA is more effective than NaF as forms a coating layer to protect from demineralisation and promote remineralisation of the tooth surface. © 2019 Elsevier Ltd

Item Type: Article
Funders: University Malaya Research Grant, Kuala Lumpur Malaysia ( PG 187-2015 A ), HIR Grant ( H-18001-00-C0000011 )
Uncontrolled Keywords: Poly-γ-glutamic acid; Demineralisation; Remineralisation
Subjects: Q Science > QD Chemistry
R Medicine > RK Dentistry
Divisions: Faculty of Dentistry
Faculty of Science > Department of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 11 Feb 2020 01:56
Last Modified: 11 Feb 2020 01:56
URI: http://eprints.um.edu.my/id/eprint/23729

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