Development of a Novel Dental Filling Material Using Hydroxyapatite Derived from Waste Oyster Shells

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dc.contributor.authorUresha, M.T.S.
dc.contributor.authorPitawala, H.M.J.C.
dc.date.accessioned2021-02-25T06:11:36Z
dc.date.available2021-02-25T06:11:36Z
dc.date.issued2020
dc.description.abstractThe present study aimed at developing a novel zinc phosphate based dental cement by adding Pentacalcium hydroxide triphosphate (hydroxyapatite) as a reinforcing filler to investigate the mechanical and elution properties of the prepared specimens. Here waste oyster shells of Crassostrea madrasensis were calcined to obtain Oxocalcium. The Calcium dihydroxide precursor for the synthesis of hydroxyapatite by wet precipitation method at room temperature was prepared by dissolving Oxocalcium in water. Synthesized hydroxyapatite was added into zinc phosphate powder in seven different ratios and specimens were fabricated. X-ray fluorescence spectroscopy results of oyster shells showed that Oxocalcium (88.5%) was the major oxide while Silicon dioxide and Iron (Ⅲ) oxide were present in trivial amounts. The stoichiometric calcium/phosphorus ratio of synthesized hydroxyapatite was close to 1.7. Both Fourier Transform Infrared spectroscopy and X-ray Diffraction results of unsintered and sintered hydroxyapatite were compatible with the results of the commercial compound. The particle size of the sintered hydroxyapatite was 1.518×10-6 m. Zinc phosphate cement with 10% hydroxyapatite was identified as the ideal percentage that showed the best mechanical and chemical properties with the highest compressive and diametral tensile strengths which were 66.85×106 Nm-2 are 18.88 Nm-2 respectively. Further, it showed the lowest elution percentage in pH 3 and 5 aqueous 2-Hydroxypropanoic acid and water. Hence hydroxyapatite synthesized from waste can be used as reinforcing filler in zinc phosphate dental cement. Keywords: Zinc phospate dental cement, Hydroxyapatite, Crassostrea madrasensis, oystersen_US
dc.identifier.isbn9789550481293
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/6093/proceeding_oct_08-455.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;International Research Conference
dc.subjectMaterials Sciencesen_US
dc.subjectMineral Sciencesen_US
dc.titleDevelopment of a Novel Dental Filling Material Using Hydroxyapatite Derived from Waste Oyster Shellsen_US
dc.title.alternativeInternational Research Conference 2020en_US
dc.typeOtheren_US
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